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Old 04-12-2021, 11:38 PM   #1
jonnymel
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Rear differential

I have a 1960 gmc step side it has a 4:10 gear ratio in it . I would like to change the ratio . I’m thinking 3:55 .
Would still like a good start of the line but need a highway gear too.
Also does anyone have a suggestion for a supplier. Don’t want to change the axle just the differential.
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Old 04-13-2021, 12:36 AM   #2
SkinnyG
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Re: Rear differential

Is this the HO32 rear end (removable center section AND removable rear cover)? I don't think you will find -any- gears for it.
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1977 Silverado: Shortboxed & dropped, potato-potato
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Old 04-13-2021, 08:01 AM   #3
jonnymel
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Re: Rear differential

Ok
Thanks
Obviously I need to identify exactly what I have first. Possibly not as easy as I’d hoped. So what does everyone do ? Drive around with 4:10 gears or is there a rear axle swap that’s relatively simple .
I have a 454 with a 400 turbo 3 speed and I need to improve my highway rpms
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Old 04-13-2021, 08:08 AM   #4
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Re: Rear differential

Hey SkinnyG
I looked at your Apache project.......great job , I love it.
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Old 04-13-2021, 10:50 AM   #5
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Re: Rear differential

Thanks!

You could swap just about any axle relatively easily. You'd need to weld on axle mounts. 60-62 is a different width than 63+, so even swapping a later axle requires welding mounts. I'd go 63+ 12-bolt or even a Ford 8.8. Keep in mind bolt pattern and such.

You could swap in a 5-speed. Be gentle though, a 454 has a lot of torque.

You could find a 4L80E for the overdrive and get a trans controller for it.
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1961 Apache: "Grabber Orange" Shortboxed, pancake, step-notch, air-ride, boosted-LS
1977 Silverado: Shortboxed & dropped, potato-potato
V8 Pontiac Firefly (Chevy Sprint): The ultimate engine swap: 5.7L in a 1.0L bag
Lotus Super 7 Replica: Scratch-built street-legal rollerskate
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Old 04-13-2021, 03:52 PM   #6
jbgroby
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Re: Rear differential

I have a '60 with the DANA 44, called Precision Gear and bought a 3.23 (stock was 3.92), I changed all the inner and outer bearings while I was at it too.
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Old 04-13-2021, 07:55 PM   #7
AcampoDave
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Re: Rear differential

I'm thinking going to a 3.55 still isn't a big enough change to get you what you're looking for. I feel a 454 has plenty enough torque that it should still smoke the tire with a 3.08

Last edited by AcampoDave; 04-13-2021 at 08:02 PM.
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Old 04-14-2021, 02:06 AM   #8
vetnat
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Re: Rear differential

If it is an HO32, Yukon has a 3.38 ring and pinion.
https://www.yukongear.com/partslist....nion+Gear+Sets
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Old 04-14-2021, 09:04 AM   #9
jonnymel
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Re: Rear differential

Thanks , I was wondering about that.
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Old 04-14-2021, 09:25 AM   #10
jonnymel
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Re: Rear differential

Thanks everyone for your input .......I really appreciate it.
I think I will go with the 3:38 Yukon Ring and Pinion.
Next question other than a new diff gasket and cover what other parts would I buy as well.
I’m relatively sure nothing has been done to the rear end previously.
I’m a rookie at this. I will purchase parts but have some qualified help for the install.
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Old 04-14-2021, 10:35 AM   #11
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Re: Rear differential

Oh cool!

I've previously run Yukon gears - they are very good.
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1977 Silverado: Shortboxed & dropped, potato-potato
V8 Pontiac Firefly (Chevy Sprint): The ultimate engine swap: 5.7L in a 1.0L bag
Lotus Super 7 Replica: Scratch-built street-legal rollerskate
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Old 04-14-2021, 05:32 PM   #12
60short
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Re: Rear differential

from my experience / while you are in there ....

The bearings are R1502EL - available from several manufacturers including Timkin and National

The seals are : SKF 18695 - also interchangeable and available from several manufacturers / vendors.

(the best prices I found was on RockAuto, searching by PN).

Somebody else made a good point - above parts are for the Eaton HO 32/33
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Last edited by 60short; 04-15-2021 at 10:39 PM.
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Old 04-15-2021, 01:47 PM   #13
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Re: Rear differential

take a pic of the rear cover and post it. Most GMC's had a Dana rear axle.
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Old 04-15-2021, 03:12 PM   #14
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Re: Rear differential

lucky you! most of us just tool around in our 4.57s day dreaming about 4:10s

cross your fingers you've got a dana under there and good luck finding a suitable gear swap!
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