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03-04-2021, 09:27 PM | #1 |
Registered User
Join Date: Mar 2005
Location: Bartlett, TN (near Memphis)
Posts: 202
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Planning to upgrade the 12 bolt rear end in my 1970
I'm going to have a buddy rebuild the rear end in my 1970 SB. I plan to upgrade the old open carrier with an Eaton limited slip differential and will get a new 3.73 ring and pinion gearset. I called Toms Differentials today and they said that they can't get the 3.73 US gear ring set anymore so it looks like I will go with Yukon on the ringset. Does anyone have any useful bits of wisdom to offer regarding what vendors to check with? As of now, it looks like Toms Differentials for the Eaton unit and installation kit and Randy's Ring and Pinion for the gear set.
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03-04-2021, 09:37 PM | #2 |
Registered User
Join Date: Sep 2011
Location: Ark City, Kansas
Posts: 3,314
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Re: Planning to upgrade the 12 bolt rear end in my 1970
I read here, or somewhere... recently. An experienced drive train builder, preferred Motive Gear As his preferred brand of gear sets. Can’t remember the reasons. Not understanding why Tom’s couldn’t use another brand...
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03-05-2021, 04:24 PM | #3 |
Registered User
Join Date: Apr 2009
Location: PNW
Posts: 553
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Re: Planning to upgrade the 12 bolt rear end in my 1970
Some places are refusing to use offshore junk, because they don't want it coming back.
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03-05-2021, 06:36 PM | #4 |
Registered User
Join Date: Jul 2012
Location: Whitehorse yukon
Posts: 1,218
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Re: Planning to upgrade the 12 bolt rear end in my 1970
I seen a few threads on dislike for Richmond gear ring and pinion as they provide zero support for there products yukon r&p i seen positive threads about them
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03-05-2021, 07:37 PM | #5 |
Its a Truck Thing......
Join Date: Dec 2004
Location: Sierra Vista, Arizona
Posts: 3,159
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Re: Planning to upgrade the 12 bolt rear end in my 1970
I have a Motive set and it has been fine. If you can get a Richmond Gear set to work without some noise, good luck. Digging into that a few years ago it read they changed the metal process in India and had to be beyond perfect to run without noise. Lots of info on that subject on the web.
Smitty
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71 C10 283/3SPD Full Resto 71 GMC 1500 Sierra Grande http://67-72chevytrucks.com/vboard/s...d.php?t=518599 70 C10 Suburban Former military GSA truck. 72 Chevy Blazer 4X4, Sloppy Jo, Mountain Climber. Wife says no more trucks. http://67-72chevytrucks.com/vboard/s...d.php?t=707378 72 GMC 1 Ton Motor Home, wife said no more trucks until she saw this one. Gen 3 6.0/4L80E 4.10 http://67-72chevytrucks.com/vboard/s...d.php?t=761110 68 GMC Suburban was 3/4 ton, now 1/2.Wife shook her head 71 C30 Wrecker 71 C20 Scott-Bilt As weird as it gets..BB Cheyenne AC Truck 68 GMC Long Stepside. They keep following me home 71 C20 Longhorn/Ole Yellor 69 C30 Former Motor Home, Flat Bed time |
03-06-2021, 09:26 PM | #6 |
Registered User
Join Date: Dec 1999
Location: Austin, TX, USA
Posts: 7,714
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Re: Planning to upgrade the 12 bolt rear end in my 1970
I set up a set of Elite gears in a 12 bolt last year with a Yukon LSD. I would certainly use both of those again and would choose the Yukon LSD over the Eaton because it's $100's cheaper.
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03-06-2021, 09:40 PM | #7 |
Senior Member
Join Date: Jul 2000
Location: North Texas
Posts: 3,460
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Re: Planning to upgrade the 12 bolt rear end in my 1970
It's been several years since I bought from them, but Randy's pre- and post-sales support was excellent. And their YG-series gears are very quiet, but not the cheapest. I suspect their ZG-series would be just fine for a truck.
Here is the difference: USA Standard gears are made by Yukon - same materials, process, plant, drawings, etc. When the Yukon gears are brought in house, they go through quality control. If the contact portion of the ring and pinion don't meet tolerances for a quiet gear (too rough), then the gear is downgraded to USA Standard (ZG) rather than tossing it in the trash. It's still a great gear strength wise and etc, but in some instances they can be noisy. I have several customers of mine that all they buy is USA Standard gears and I've yet to hear of any actually being noisy.
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Mike 1969 C10 LWB -- owned for 35 years. 350/TH350, 3.08 posi, 1st Gen Vintage Air, AAW wiring harness, 5-lug conversion, 1985 spindles and brakes. 1982 C10 SWB -- sold 1981 C10 Silverado LWB -- sold, but wish I still had it! 1969 C10 (not the current one) that I bought in the early 1980s. Paid $1200; sold for $1500 a few years later. Just a hint at the appreciation that was coming. Retired as a factory automation products salesman. Worked part-time over the years for an engine builder and a classic car repair shop. Member here for 24 years! This is the very first car/truck Internet forum I joined. I still used a dial-up modem back then! |
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