3/4 ton Eaton rearends? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

bfr57 · 11-01-2007, 11:11 PM

Looking at converting my 1/2 ton 71 4x4 to a 3/4 ton. There is a set of 3/4 ton axles here locally that is an Eaton rear. I know they are beefy axles, but also heard parts are hard to find if I need anything. Anybody know about this?

earl87gta · 11-02-2007, 02:28 AM

you can use some 14blt parts for it. gears are not available so your stuck with stock gear sets. I tihnk they came in 3 only 4;10, 4:57, and 5:13 I may be wrong on this I think once some one said they may have made a 3:73 but it was never verified. you can get every thing to rebuild one still from randys but its big money to rebuild one I think the 3rd meber rebuild kit is like $500. But chances are you wont need it the axle is almost bomb proof. I have one in my burb and keep a spair incase some day some thing does go wrong but I dont see it happening.
You can use a locker from a 14blt and the axles from one 2 but i dont know what is all involved with doing it. they do have the best groud clerence for all the 3/4 and 1ton axles.

earl87gta · 11-02-2007, 03:03 AM

one other thing for breaks you can use a disk kit for a 14blt axle thats what Im doing . I need to post pics one of these days.

wibilly · 11-02-2007, 03:39 AM

i have one with a detroit locker in my shortened k/20. beabings and seals are available at napa or o'rilieys, but must be replaced in pairs because replacments are tapered rather than the original barrel shaped.as earl said bolt on 14 bolt disk brake brackets work.i also converted mine to disc brakes. he is also right on the gear ratios. there was never a 3.73 however an aftermarket co was making a 3.90 at one time but it was discontinued long ago

va_tlc · 11-02-2007, 07:09 PM

i have one for sale also and the metal tag said 4.55 , i ran it just a couple days b4 i changed to 3.73, cause it was wayyyy low for the hi-way, yall think that tag was rite?

earl87gta · 11-02-2007, 11:59 PM

I dont thnik so eaton rears were 4:57 if you count the teeth. yhey probebly just use the same tag for any thing close

**special-K** · 11-03-2007, 07:10 AM

There were 4.57 Corporate (HO52) and 4.56 Dana60s.I think the Dana44 ran 4.55.I know the Dana44s run 4.09s in trucks with 4.10s.

earl87gta · 11-03-2007, 07:22 AM

my 68 had 4:56 in the front d44 with the 4:57 in the rear Eaton.

11-01-2007, 11:11 PM	#1
bfr57 Registered User Join Date: Jul 2003 Location: Tucson, AZ Posts: 106	3/4 ton Eaton rearends? Looking at converting my 1/2 ton 71 4x4 to a 3/4 ton. There is a set of 3/4 ton axles here locally that is an Eaton rear. I know they are beefy axles, but also heard parts are hard to find if I need anything. Anybody know about this?

11-02-2007, 02:28 AM	#2
earl87gta Senior Member Join Date: Dec 2003 Location: Kingsport TN Posts: 4,641	Re: 3/4 ton Eaton rearends? you can use some 14blt parts for it. gears are not available so your stuck with stock gear sets. I tihnk they came in 3 only 4;10, 4:57, and 5:13 I may be wrong on this I think once some one said they may have made a 3:73 but it was never verified. you can get every thing to rebuild one still from randys but its big money to rebuild one I think the 3rd meber rebuild kit is like $500. But chances are you wont need it the axle is almost bomb proof. I have one in my burb and keep a spair incase some day some thing does go wrong but I dont see it happening. You can use a locker from a 14blt and the axles from one 2 but i dont know what is all involved with doing it. they do have the best groud clerence for all the 3/4 and 1ton axles. __________________ Earl 68 2500 4x4 GMC Burb Last edited by earl87gta; 11-02-2007 at 02:29 AM.

11-02-2007, 03:03 AM	#3
earl87gta Senior Member Join Date: Dec 2003 Location: Kingsport TN Posts: 4,641	Re: 3/4 ton Eaton rearends? one other thing for breaks you can use a disk kit for a 14blt axle thats what Im doing . I need to post pics one of these days. __________________ Earl 68 2500 4x4 GMC Burb

11-02-2007, 03:39 AM	#4
wibilly Senior Member Join Date: Nov 2005 Location: northwestern wi Posts: 2,111	Re: 3/4 ton Eaton rearends? i have one with a detroit locker in my shortened k/20. beabings and seals are available at napa or o'rilieys, but must be replaced in pairs because replacments are tapered rather than the original barrel shaped.as earl said bolt on 14 bolt disk brake brackets work.i also converted mine to disc brakes. he is also right on the gear ratios. there was never a 3.73 however an aftermarket co was making a 3.90 at one time but it was discontinued long ago __________________ common sense isn't so common anymore

11-02-2007, 07:09 PM	#5
va_tlc Registered User Join Date: Nov 2005 Location: VIRGINIA Posts: 905	Re: 3/4 ton Eaton rearends? i have one for sale also and the metal tag said 4.55 , i ran it just a couple days b4 i changed to 3.73, cause it was wayyyy low for the hi-way, yall think that tag was rite? __________________ 1969 rs 1966fastback 1969swbc/10 2006gt 1972swb4x4

11-02-2007, 11:59 PM	#6
earl87gta Senior Member Join Date: Dec 2003 Location: Kingsport TN Posts: 4,641	Re: 3/4 ton Eaton rearends? I dont thnik so eaton rears were 4:57 if you count the teeth. yhey probebly just use the same tag for any thing close __________________ Earl 68 2500 4x4 GMC Burb

11-03-2007, 07:10 AM	#7
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,852	Re: 3/4 ton Eaton rearends? There were 4.57 Corporate (HO52) and 4.56 Dana60s.I think the Dana44 ran 4.55.I know the Dana44s run 4.09s in trucks with 4.10s. __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~

11-03-2007, 07:22 AM	#8
earl87gta Senior Member Join Date: Dec 2003 Location: Kingsport TN Posts: 4,641	Re: 3/4 ton Eaton rearends? my 68 had 4:56 in the front d44 with the 4:57 in the rear Eaton. __________________ Earl 68 2500 4x4 GMC Burb

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