What rear end is in my 3/4 ton truck? Pics - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Brettd85 · 02-02-2011, 10:18 PM

I tried a search.. Its different then I've seen. Its a 3/4 ton 68 with coils. It has a rear cover and a third member??? I dont know what it is or if its worth keeping. Wish it was a Dana 60

Crappy pics, thanks for your help

**Classic Heartbeat** · 02-02-2011, 10:24 PM

That is the eaton (corperate) rear end. We call them banjo rear ends. WES

Brettd85 · 02-02-2011, 10:54 PM

I was wondering if it was the corporate rear.. I'll do a search to get more info.

**Stocker** · 02-02-2011, 10:54 PM

Tough as nails.... definitely worth keeping IMO. Some brake parts are hard to find so guys will swap them out, but if it's in good working order, I'd keep it.

**Stocker** · 02-02-2011, 10:58 PM

Here's a parts diagram posted by board member 1969 GMC:

Vintage Windmills · 02-02-2011, 11:26 PM

Its the presence of that 5.284 bearing in the diagram that makes them strong. That keeps good alignment even under high load.

y5mgisi · 02-02-2011, 11:33 PM

Eaton. They are good and strong.

Longhorn Man · 02-02-2011, 11:48 PM

they are tough as nails, but, outdated.
some brake parts are hard to find, some brake parts you will not find. If it needs rebuilt, you'll have the same issues, and gearing is very limited.

Vintage Windmills · 02-02-2011, 11:55 PM

Quote:

Originally Posted by Longhorn Man

they are tough as nails, but, outdated.
some brake parts are hard to find, some brake parts you will not find. If it needs rebuilt, you'll have the same issues, and gearing is very limited.

Roughly what percentage of 3/4 tons had these vs Dana 60's? Were there factors such as 4x4, BBC, that made a certain truck more likely to have or not?

Longhorn Man · 02-03-2011, 12:13 AM

Most 3/4 tons got the Dana
many GMCs got the dana
most of the rest got the Eaton

The Dana, while I know there diffs are pretty good, these 3/4 tons got lame axleshafts, so as a (stock) rearend they kinda suck.

justcuz · 02-03-2011, 02:01 AM

These rear ends make a Dana 60 look like a 10 bolt. Agreed brake parts are hard to find, but a 14 bolt disc brake conversion fixes that. Guys run these rearends in off road trucks with 40 inch tires and have little if any problems with them. If you want to get rid of it let me know, I probably have a Dana 60 laying around I'll trade you. The axles only have 17 splines but rarely break. If they do you can insall 14 bolt side gears and 14 bolt 30 spline axles in this rearend. Keep it, you won't break it on a 2wd truck. Yes it is a corporate rear commonly referred to as an Eaton.

Tx Firefighter · 02-03-2011, 08:38 AM

I never liked them due to the gearing options. I do believe nothing taller than like 4.11 was available.

Jessechop · 02-03-2011, 09:44 AM

NAPA has most all of the brake parts for it

justcuz · 02-03-2011, 11:25 AM

True 4.10's are the highest gear, but with an OD automatic such as a 700R4 those 4.10's become a 2.90 in OD. 3.07 with a 4L80.

02-02-2011, 10:18 PM	#1
Brettd85 Registered User Join Date: Jan 2011 Location: Redmond, WA Posts: 81	What rear end is in my 3/4 ton truck? Pics I tried a search.. Its different then I've seen. Its a 3/4 ton 68 with coils. It has a rear cover and a third member??? I dont know what it is or if its worth keeping. Wish it was a Dana 60 Crappy pics, thanks for your help

02-02-2011, 10:24 PM	#2
Classic Heartbeat Project Junkie! Fishing Poor!! Join Date: Dec 1999 Location: Olympia,Wa. 98512 Posts: 10,770	Re: What rear end is in my 3/4 ton truck? Pics That is the eaton (corperate) rear end. We call them banjo rear ends. WES __________________ On-line catolog Classic Heartbeat Pickup Parts WEHEPP@comcast.net Call us Toll Free (888) 338-2502 Like Us on Facebook No appointment necessary. 72 BB Chevy Custom Deluxe / Custom Camper 67 I-6 (Soon to be 5.7 LS1) Panel 68 BB Chevy Short Bed 72 6.0 LQ9 Short Bed Chevy 4X4 Olympia's fastest growing truck parts supplier. Olympia's home for Wayward Chevys

02-02-2011, 10:54 PM	#3
Brettd85 Registered User Join Date: Jan 2011 Location: Redmond, WA Posts: 81	Re: What rear end is in my 3/4 ton truck? Pics I was wondering if it was the corporate rear.. I'll do a search to get more info.

02-02-2011, 10:54 PM	#4
Stocker 20' Daredevil (Ret) Join Date: May 2003 Location: Jefferson State Posts: 13,617	Re: What rear end is in my 3/4 ton truck? Pics Tough as nails.... definitely worth keeping IMO. Some brake parts are hard to find so guys will swap them out, but if it's in good working order, I'd keep it. __________________ - Mike - 1972 K20 LWB 350/350/205 RIP El Jay

02-02-2011, 10:58 PM	#5
Stocker 20' Daredevil (Ret) Join Date: May 2003 Location: Jefferson State Posts: 13,617	Re: What rear end is in my 3/4 ton truck? Pics Here's a parts diagram posted by board member 1969 GMC: __________________ - Mike - 1972 K20 LWB 350/350/205 RIP El Jay

02-02-2011, 11:26 PM	#6
Vintage Windmills Vintage 4x4s Join Date: Sep 2010 Location: Prior Lake, MN Posts: 4,305	Re: What rear end is in my 3/4 ton truck? Pics Its the presence of that 5.284 bearing in the diagram that makes them strong. That keeps good alignment even under high load. __________________ 67 GMC K1500 Custom- 305V6 SM420, PTO, Ram Assist, yellow (the outcast) (project period correct upgrades) 67 GMC C2500 351V6 TH400, AC, PS, PB (can't decide what to do with. Update, decided to keep and will restore ) 86 CHV K30 502 th400, apple red NEW 71 CHV K20 350 SM465, ochre (saved work truck) 71 CHV K20 292 SM465, white, tach, PTO, (future project) 72 CHV K20 350 350th, medium blue (project stocker) 01 CHV K2500hd crew, indigo blue ^3 dont run and the others don't see winter either '86 K30 Cummins "Fireside" thread: http://67-72chevytrucks.com/vboard/s...d.php?t=649649 '71 K20 "get driveable" thread: http://67-72chevytrucks.com/vboard/s...d.php?t=590642 '72 K20 Build Thread: http://67-72chevytrucks.com/vboard/s...=493477&page=6

02-02-2011, 11:33 PM	#7
y5mgisi Second Chance Program Join Date: Jun 2006 Location: Portland, OR Posts: 2,642	Re: What rear end is in my 3/4 ton truck? Pics Eaton. They are good and strong.

02-02-2011, 11:48 PM	#8
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: What rear end is in my 3/4 ton truck? Pics they are tough as nails, but, outdated. some brake parts are hard to find, some brake parts you will not find. If it needs rebuilt, you'll have the same issues, and gearing is very limited.

02-03-2011, 12:13 AM	#10
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: What rear end is in my 3/4 ton truck? Pics Most 3/4 tons got the Dana many GMCs got the dana most of the rest got the Eaton The Dana, while I know there diffs are pretty good, these 3/4 tons got lame axleshafts, so as a (stock) rearend they kinda suck.

02-03-2011, 02:01 AM	#11
justcuz Registered User Join Date: May 2008 Location: Alta Loma, Ca. Posts: 930	Re: What rear end is in my 3/4 ton truck? Pics These rear ends make a Dana 60 look like a 10 bolt. Agreed brake parts are hard to find, but a 14 bolt disc brake conversion fixes that. Guys run these rearends in off road trucks with 40 inch tires and have little if any problems with them. If you want to get rid of it let me know, I probably have a Dana 60 laying around I'll trade you. The axles only have 17 splines but rarely break. If they do you can insall 14 bolt side gears and 14 bolt 30 spline axles in this rearend. Keep it, you won't break it on a 2wd truck. Yes it is a corporate rear commonly referred to as an Eaton. Last edited by justcuz; 02-03-2011 at 02:04 AM.

02-03-2011, 08:38 AM	#12
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	Re: What rear end is in my 3/4 ton truck? Pics I never liked them due to the gearing options. I do believe nothing taller than like 4.11 was available. __________________ I'm on the Instagram- @Gearhead_Kevin

02-03-2011, 09:44 AM	#13
Jessechop Registered User Join Date: Sep 2003 Location: maine Posts: 191	Re: What rear end is in my 3/4 ton truck? Pics NAPA has most all of the brake parts for it

02-03-2011, 11:25 AM	#14
justcuz Registered User Join Date: May 2008 Location: Alta Loma, Ca. Posts: 930	Re: What rear end is in my 3/4 ton truck? Pics True 4.10's are the highest gear, but with an OD automatic such as a 700R4 those 4.10's become a 2.90 in OD. 3.07 with a 4L80.



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