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#749947 - Thu May 26 2011 09:56 PM Help with eaton electric 2 speed rear end?  
loudpipes  Offline
New Guy
Joined: May 2011
Posts: 3
Knoxville, TN
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


#749962 - Thu May 26 2011 11:25 PM Re: Help with eaton electric 2 speed rear end? [Re: loudpipes]  
Wrenchbender Ret.  Offline
Master Gabster
Joined: Jun 2004
Posts: 9,708
Lenexa Ks.
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.

1956 Chevy 1/2-Ton Pickup


#750012 - Fri May 27 2011 03:00 AM Re: Help with eaton electric 2 speed rear end? [Re: Wrenchbender Ret.]  
loudpipes  Offline
New Guy
Joined: May 2011
Posts: 3
Knoxville, TN
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

#750127 - Fri May 27 2011 07:53 PM Re: Help with eaton electric 2 speed rear end? [Re: loudpipes]  
Jungerfrosch  Offline
Wrench Fetcher
Joined: Aug 2009
Posts: 195
Milford, VA


1946 Chevy OS 1.5ton, 1955 GMC 3100, along with other various IH,Ford,Nash,MGB,.....

#750403 - Sun May 29 2011 05:18 AM Re: Help with eaton electric 2 speed rear end? [Re: Jungerfrosch]  
crenwelge  Offline
Shop Shark
Joined: Jan 2008
Posts: 4,659
Fredericksburg, Texas
Eaton used the same electric shift box on all trucks that used an electric shift until they went to an electronic switch. A 366


#750406 - Sun May 29 2011 05:31 AM Re: Help with eaton electric 2 speed rear end? [Re: Jungerfrosch]  
crenwelge  Offline
Shop Shark
Joined: Jan 2008
Posts: 4,659
Fredericksburg, Texas
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.


#750456 - Sun May 29 2011 04:13 PM Re: Help with eaton electric 2 speed rear end? [Re: crenwelge]  
loudpipes  Offline
New Guy
Joined: May 2011
Posts: 3
Knoxville, TN
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

#1071375 - Wed Dec 03 2014 01:47 PM Re: Help with eaton electric 2 speed rear end? [Re: loudpipes]  
Brentblk  Offline
Moderated
Joined: Dec 2014
Posts: 1
Texas
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


#1163797 - Wed May 04 2016 05:47 PM Re: Help with eaton electric 2 speed rear end? [Re: loudpipes]  
70chiptruck  Offline
New Guy
Joined: Apr 2016
Posts: 3
MI
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


#1164100 - Fri May 06 2016 05:41 AM Re: Help with eaton electric 2 speed rear end? [Re: loudpipes]  
crenwelge  Offline
Shop Shark
Joined: Jan 2008
Posts: 4,659
Fredericksburg, Texas
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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