C60 2 speed rear end

C60 2 speed rear end DEFAULT
I really want to build a truck that is geared to pull a million pounds, but at the same time is driveable empty. I think an SM465 with a gear splitter would be fantastic for that, but as I posted about earlier my knees don't like the manual trans. (or working the clutch that is)

So, I'm looking around at overdrive automatics, not too thrilled with anything really. I'm still liking the idea of an aftermarket gear splitter attached to an auto, but damn those are expensive.

Anyway...what about a 2 speed rear end? I don't know anything about them, other than they come in really big trucks. Is there something available that I could reasonably adapt to the back of a 70-something chevy?

Right now with 4.56 gears in my '79, highway RPMs are already terrible, and I'd like to gear it even lower...

__________________
'73 K20 Cheyenne Super Camper Special 350/TH350/NP205 sittin' on 33's.

You can set my truck on fire and roll it down a hill,
and I still wouldn't trade it for a Coupe de Ville.

Sours: http://67-72chevytrucks.com/vboard/showthread.php?t=428761
Chevrolet Two-Speed Rear Axles

 Rated Axle Capacity

15,000 lbs 17,000 lbs    Ratios6.40/8.72:15.83/7.95:1 6.40/8.72:1    Make Chevrolet    TypeFull floating planetary reduction    Brake Size15 x 4.0015 x 6.00    Gear Backlash0.008" - 0.015"    Lubrication Capacity 20 pints    Speed RangeHighLowHighLowHighLow Maximum gear reduction in lowest transmission gear
(axle ratio x transmission ratio)  4-speed Chevrolet45.1861.56  45.1861.56  5-speed Spicer 3153  34.9847.40    5-speed Clark 267V38.7852.84  38.7852.84  5-speed New Process 47.4264.61  47.4264.61  5-speed Clark 264VO  35.3348.18  
Sours: https://www.chevyc60.com/the_rear_axle_page.htm
  1. 1967 mustang lower control arm
  2. Lg g pad 5
  3. 2002 honda civic wiper blades
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Re: 2 speed rear diff. question. (video)

Iron Clad#957995Sun Jul 21 2013 10:06 PM

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An electric actuator should bolt right in where the original vacuum actuator is now.
Are you changing over from a single speed rear to a 2 speed, Or are you changing to another 2 speed with higher gears?
The 2 speed wont allow you to go any faster unless its high gear is geared higher than your original.
Nice looking truck by the way!


Last edited by JeffL; Sun Jul 21 2013 10:10 PM.


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Re: 2 speed rear diff. question. (video)

Iron Clad#958014Sun Jul 21 2013 10:39 PM

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Im not sure if the parts stores can get them, they are available. They may still be available from GM
A lot of the 2 spds use the same actuators.
If you wait for Spanky , or Crenwelge to chime in , I know they have that answer for you.



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Re: 2 speed rear diff. question. (video)

Iron Clad#958017Sun Jul 21 2013 10:50 PM

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If we dont hear anything, I do know a guy I can ask. he has my gear case out of my 2spd right now, installing all new bearings for me.
I should have that back this week.
I think where you didnt have a 2 spd, the electric is the simplest way to go.


Last edited by JeffL; Sun Jul 21 2013 10:51 PM.


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Re: 2 speed rear diff. question. (video)

Iron Clad#958170Mon Jul 22 2013 01:47 PM

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'Bolter

Nice truck. The vacuum hookup is pretty simple, look in the book or dealer for similar truck. The 2 speed you got looks good, however, the truck probably will not go any faster, ratios are slow and slower. Looks like not much room for a brownie, don't know what trans. you have now, however, NV-4500 would help top speed or an OD auto.



'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.

Re: 2 speed rear diff. question. (video)

Iron Clad#958220Mon Jul 22 2013 05:22 PM

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I think that you said that your single speed was a 7.20:1 or something? I think most 2 speeds were 6.40/8.72:1 from what I've read. Figuring that, at 65MPH the two speed truck with 9.00-20 @ 520RPM would be turning 3,600RPM. 7.20:1 gives 58MPH @ the same 3,600RPM. It's a 12.5% reduction. An option I'd look into for an additional overdrive would be an old auxiliary or "brownie" trans. With a .85 OD brownie and the 6.40 gears you'd only be turning 2,800RPM @ 60MPH and a little over 3,[email protected], plus even more gears if you use the truck as a truck.


Last edited by 66Submarine; Mon Jul 22 2013 05:24 PM.


Some of my crap:
1963 C-30 flatbed dually 292/SM420
1965 C-10 LWB fleet 250/column shift 3 speed
1965 C-30 9' stepside 250/SM420/4.10 gears (my DD)

Website I made for my crap:
http://www.66submarine.com

Re: 2 speed rear diff. question. (video)

Iron Clad#958313Mon Jul 22 2013 10:22 PM

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Iowa

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I hope I'm not out-of-line here,but on the "Parts for sale",(about a year ago??),Marvin Ribbich had several Clark 5-speed O.D.'s,and Brown-Lipe auxy. trannys for sale,since none would fit his '46 1-1/2-ton panel. Floor clearance issues. Maybe you could send him a P.M.,and see what happens. I bought some wheel cylinders from him,and he's very knowledegable,and nice to deal with. Hope this helps.



Just sold: 1955 2nd Series 6500 2-Ton Flatbed Truck
Mo' Tater
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Re: 2 speed rear diff. question. (video)

Iron Clad#958353Tue Jul 23 2013 02:48 AM

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'Bolter

Chevy used a 15,000 2 speed rear in their 60 series during 60's until the 70's which had vacuum shift. Their 70 and 80 series used an Eaton 18k 2 speed which could be either electric shift or air shift. The air and electric shift were interchangeable. And these shifters were interchangeable from the 40's until the 80's when they went to an electronic shifter. Dana made a kit to retrofit the earlier electric to the later electronic shift. This is a service manual for the Eaton shifters. http://www2.dana.com/pdf/AXSM-0029.pdf

I know the earlier corporate 2 speeds were vacuum and nothing would fit from an Eaton. I don't think the later corporate will accept an electric shifter either. The shifters for Eaton are all the same whether they came from a Ford, IH or Chev except that from the mid 50's back the motors were 6 volt and the later ones had 12 volt. All I would know to do is take a shift unit from any old electric shift axle and try it. But I really doubt if it will fit. If you take the 2 bolts holding the shifter on and photograph what kind of shift fork sticks out of the carrier housing, I can probably tell by looking at it if an Eaton shifter will work.

If it won't run over 45, you aren't stepping on the gas hard enough. A 292 6 is rated at 4000 RPM a 327 is rated at 4400 RPM.


Re: 2 speed rear diff. question. (video)

Iron Clad#958372Tue Jul 23 2013 09:08 AM

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WOW! Thanks much folks for all this information. I really do appreciate it. 66Sub, WetWilly, Mike B, and Crenwelge, this is all great info. You guys are steering me down the right path smileIt doesn't bother me to stay with the vacuum shift unit as long as I can get it to work and find all of the components, LOL....I'm thinking of going down that path. Crenwelge, I'll try to get a picture of the shift forks as soon as I can. Also, I'm going to order the 1966 and 1967 Service manual supplement tonight! This rear diff. came off of a 1967 Chevy C60 that was part of my Wife's family fleet of water trucks back then. Apparently this truck would do 60 to 65 mph, although I don't know what tranny was in the truck. Thanks again, and anymore info. would be greatly appreciated...


1960 Chevy Apache 1/2-ton
1965 Chevy Half-Ton Suburban
1966 Chevy C60 2-Ton

Stupid is as stupid does. - Forrest Gump

Re: 2 speed rear diff. question. (video)

Iron Clad#958396Tue Jul 23 2013 10:48 AM

Joined: Oct 2010

Posts: 1

Oregon

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New Guy

Hello, I may be interested in your single speed rear end that you are removing. Please tell me more about what you have. Maybe you could send me a PM. Thanks.


Re: 2 speed rear diff. question. (video)

Iron Clad#958934Thu Jul 25 2013 06:40 PM

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My 1958 GMC LCF 370 Has factory electric 2 speed and the actuator connected to the speedometer. It's a corporation GM rear end. It also has the factory 2 speed switch in the gear shift knob. Someone had changed it to the red push-pull button. But I disassembled the gear shift knob and reworked the switch in it. Then removed the red button.



57 GMC LCF 370
55 John Deere 40-W
59 John Deere 430-W
2000 GMC 4x4
56 John Deere 420-W
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2 Speed Planetary Differential Operation Explained
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Help with eaton electric 2 speed rear end?

#749947Thu May 26 2011 09:56 PM

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New Guy

Hey yall, I just bought a 79 Chevy C60 Wrecker. 366 BBC, 5 speed, 2 speed rear, dual winches, dual swivel booms, etc. I know this site mainly focuses on pre 73 stuff, but I figure the good folks in the Big Bolts section will know a bit about the later big trucks as well. I'm a bit new to the 2 ton stuff, myself. My 1 ton is getting too beat down pulling heavy so I needed a bigger truck.

One odd thing about it is the rear end looks like it was possibly swapped. For one it's a 6 lug instead of the usual 10 lug or spoke wheel hubs I usually see on them. The 2 speed wires either weren't ever hooked up when the new rear end was put in or something went wrong with it and they snipped them. An IH Loadstar 1600 that a briefly had a couple years back had the same 2 speed box so I'm guessing it came in quite a few different trucks.

So which wire hooks up to what? There's 2 coming from the box and 3 coming from the frame, so I'm guessing one is a ground? I've tried having a touching the wires together while my friend flips the switch to see if I can hear it shift. But I guess I need to figure out which is the ground before that does any good.

Also, right now, I'm not sure which gear the rear is in right now. It currently tops out at an honest 60 mph give or take a few so I'm guessing high. That sound about right?

Onto some photos of it.

Red Wrecker front

Red wrecker rear. Holmes 500 bed

20's. 9.00R20 fronts with the normal 10 bolt wheel on 5 lug hubs like every other MD chevy I see.

22.5's. 11-22.5's. 6 lug

2 speed box. Looks like the typical eaton 2 speed box to me?

Diff. Does that rear end look factory?

Other Misc pics of the truck.

Interior

Shifter

Engine bay

366

I guess that about covers it. Any help would be appreciated.


Last edited by loudpipes; Thu May 26 2011 10:16 PM.


55 Chevy 4400 1.5 ton flatbed.
79 Chevy C60 2 ton wrecker
83 Chevy C30 1 ton wrecker.
78 Chevy HD K20 woods truck.
88 Chevy C10 Stepside

Re: Help with eaton electric 2 speed rear end?

loudpipes#749962Thu May 26 2011 11:25 PM

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'Bolter

I dont remember that electric 2 speed drive in GM's but we used a world of them in IHC's. I always liked them better then the vacuum shift. You are right it probably is in high. I will look at some books tomorrow & see if I can find a scematic on it.



They say money can't buy happiness. It can buy old Chevy trucks though. Same thing.

1972 Chevy c10 Cheyenne Super

L

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New Guy

Eaton 2 speed on the IH.

Here's the 2 speed from the 70 IH Loadstar I had. It's most definitely the same 2 speed box but the axle itself seems to be different. For one it has a bolt on inspection cover intead of the solid pumpkin on the Chevy. The picture is all I have of it and it appears to have a loom dropping down so I can't tell what wire goes where from it.

IH Loadstar diff



55 Chevy 4400 1.5 ton flatbed.
79 Chevy C60 2 ton wrecker
83 Chevy C30 1 ton wrecker.
78 Chevy HD K20 woods truck.
88 Chevy C10 Stepside

C

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'Bolter

Eaton used the same electric shift box on all trucks that used an electric shift until they went to an electronic switch. A 366


C

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'Bolter

Eaton used the same electric shift box on all trucks tThe black is low, red hi, and green is ground. A 366 should run faster than 60 in 5th in hi axle unless it was governed for that because the speed limit in 79 was 55 all across the US. It looks like you have New Process which is a close ratio between 4th and 5th.


Re: Help with eaton electric 2 speed rear end?

crenwelge#750456Sun May 29 2011 04:13 PM

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New Guy

It might go faster than that. The speedometer is all over the place over 55 so I don't know how fast it actually goes.

Anyways, thanks for all the help guys. Much appreciated.

Edit - really got to wind the truck out today and according to my friend following behind me, I got it up around 75 or so running against the governor in 5th. The speedometer was reading 65...

That's with 42" tall 11-22.5 tires and whatever odd rear end is in the truck.


Last edited by loudpipes; Mon Jun 06 2011 05:09 AM.


55 Chevy 4400 1.5 ton flatbed.
79 Chevy C60 2 ton wrecker
83 Chevy C30 1 ton wrecker.
78 Chevy HD K20 woods truck.
88 Chevy C10 Stepside

Re: Help with eaton electric 2 speed rear end?

loudpipes#1071375Wed Dec 03 2014 01:47 PM

Joined: Dec 2014

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Texas

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I would like to thank jungerfrosch for posting the books for the eaton. I searched all kinds of sites look and trying different things! This was the one that worked and made the most sense!!! THANKS AGIAN


Re: Help with eaton electric 2 speed rear end?

loudpipes#1163797Wed May 04 2016 05:47 PM

Joined: Apr 2016

Posts: 3

MI

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New Guy

i know this is a perfect example of thread necrophilia but i have a 70 c60 that until last week was gutted of a shift switch and wring harness i built my own harness and found a switch in a junkyard i wired it up thanks to information found here and it works beautifully with one minnor flaw the shift motor does not shut off is this normal or am i missing a relay somewere any help is greatly apreciated


Re: Help with eaton electric 2 speed rear end?

loudpipes#1164100Fri May 06 2016 05:41 AM

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'Bolter

Take the shift box apart. They had a bad habit of accumulating water. There is a good chance that the limiting switch is stuck or the ajax screw is galled. The old style Eaton Box was the same from the 50's until about 1985 and parts are still available.



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Rear c60 end speed 2

The Chevrolet Differential

My truck has a Chevrolet 15,000# vacuum actuated 2-speed rear axle. During my initial test drive, I discovered a problem that I believed was related to the 2-speed rear axle. Rear axle operation was normal when in "Low"; however, when shifted to "High", it felt and sounded like the truck was popping out of gear. Shift it back to "Low" and everything worked fine. It should be noted that the original differential was replaced by the previous owner (or owner before him) for some undisclosed reason. The original differential was, however, included with the purchase of the truck.

I decided to take the original differential apart in an attempt to figure out why it needed to be replaced. This merely involved taking the differential apart, cleaning the pieces and looking for obvious signs of failure such as broken components, excessive wear and tear, thermal damage, etc.

The removal of all the components was fairly straightforward, though I sure am glad I bought that 24 piece 3/4" socket set...everything is big on a C60. Each piece was cleaned in my parts tank as it came off. I found the major components (yoke, drive pinion gear, ring gear, shifter sleeve and yoke, bearings and races) to actually be in great shape given their age and the fact that it's a 2 ton truck.

Next I unbolted the ring gear from the Differential and Planet Support Case and Ring Gear and split open the case to reveal the sun and planetary gears.

The first sign of trouble came in the form of thermal damage to the Differential and Planet Support Case and Ring Gear. Note the bluish thermally induced discoloration on the inside walls of the case. Additional thermal damage was found on the top and base area of each of the four differential pinion gear posts, again evidenced by the bluish thermally induced discoloration.

The differential was then disassembled piece by piece and each component was cleaned and inspected. The thumbnails below detail the piece by piece disassembly of the differential.

wpe1.jpg (48388 bytes)   wpe3.jpg (50469 bytes)   wpe5.jpg (46180 bytes)   wpe7.jpg (47231 bytes)   wpe9.jpg (51801 bytes)   wpeB.jpg (55087 bytes)

Excessive scoring was noted on the inside of the 2 halves of the Differential and Planet Support Covers. Further inspection revealed scoring and galling of the spider shafts and differential pinion thrust washers.

This truck has a 22,000 lb. GVWR. Inspection of the frame and undercarriage prior to purchase revealed no obvious signs of abuse (cracks in the frame of leaf spring hangers, sagging springs due to fatigue, frame twist, etc.). Therefore, the thermal stresses must have been caused either by using an improperly rated lubricant or by an insufficient quantity of lubricant rather than severe overloading. In addition to the obvious property of lubricity, gear oil also dissipates heat from the metal components. The damage observed here suggests that there was an inadequate quantity of gear oil in the differential case, thus leading to the thermal damage on the inside of the differential.

Aside from the damage to the inside of the differential, the rest of the 2 speed components are actually in great shape. It's unfortunate that improper maintenance most likely led to the failure of this differential. 

 

 

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Sours: http://www.chevyc60.com/old_differential_disassembly.htm
Explanation of a 2 Speed Double Reduction Differential

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Similar news:

It was evident from Rita's face that she was now more painful than pleasant. Still, a hefty penis is not three fingers (which also barely fit). But then the head disappeared inside, and Rita froze, listening to new sensations, and letting her ass get used to it.

Little by little, she began to sit down deeper, from time to time raising herself a little, and twirling her backside, as if performing.



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