12 Bolt changing carrier - The 1947 - Present Chevrolet & GMC Truck Message Board Network

H8tulooze1 · 01-30-2024, 07:59 PM

Hello, my truck has a peg leg and I want to put a Eaton Posi. I want to reuse the 3.73's, do I have to set up the gears again or can I just change the carrier?

Thanks!

**truckster** · 01-30-2024, 08:52 PM

At a minimum you'll need to check the backlash. You might have to change the side shims.

I just installed a TrueTrac and with the new differential and new bearings I think I only had to shift mine roughly .010.

H8tulooze1 · 01-30-2024, 09:09 PM

Quote:

Originally Posted by truckster

At a minimum you'll need to check the backlash. You might have to change the side shims.

I just installed a TrueTrac and with the new differential and new bearings I think I only had to shift mine roughly .010.

Thank you!

**MikeB** · 01-31-2024, 12:48 PM

With the carrier removed, I'd check pinion pre-load and make sure the bearings feel good. And re-install the carrier shims just like they came out. That should get you in the ballpark, if not right on.

Check those carrier bearings, the best you can, and the races, too. When I added a posi to mine many years ago, I replaced all four bearings, but it's a real PITA, and you'll definitely have to read up on pinion pre-load.

I found this to be a good way to hold the carrier in place while torquing the ring gear bolts. Stand on the tire to hold things in place.

H8tulooze1 · 01-31-2024, 08:45 PM

Thank you Mike!

01-30-2024, 07:59 PM	#1
H8tulooze1 Registered User Join Date: Oct 2007 Location: So Cal Posts: 36	12 Bolt changing carrier Hello, my truck has a peg leg and I want to put a Eaton Posi. I want to reuse the 3.73's, do I have to set up the gears again or can I just change the carrier? Thanks! __________________ 1967 Nova SS LS9 800HP 1965 Malibu SS Convertible F/S 1965 Chevelle 2-Door Wagon F/S 1972 K5 Blazer 5.3

01-30-2024, 08:52 PM	#2
truckster Senior Member Join Date: Jan 2001 Location: Orem, Utah Posts: 7,953	Re: 12 Bolt changing carrier At a minimum you'll need to check the backlash. You might have to change the side shims. I just installed a TrueTrac and with the new differential and new bearings I think I only had to shift mine roughly .010. __________________ I have sworn upon the altar of God, eternal hostility against every form of tyranny over the mind of man. - Thomas Jefferson

01-31-2024, 12:48 PM	#4
MikeB Senior Member Join Date: Jul 2000 Location: North Texas Posts: 3,562	Re: 12 Bolt changing carrier With the carrier removed, I'd check pinion pre-load and make sure the bearings feel good. And re-install the carrier shims just like they came out. That should get you in the ballpark, if not right on. Check those carrier bearings, the best you can, and the races, too. When I added a posi to mine many years ago, I replaced all four bearings, but it's a real PITA, and you'll definitely have to read up on pinion pre-load. I found this to be a good way to hold the carrier in place while torquing the ring gear bolts. Stand on the tire to hold things in place. Attached Images __________________ 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!

01-31-2024, 08:45 PM	#5
H8tulooze1 Registered User Join Date: Oct 2007 Location: So Cal Posts: 36	Re: 12 Bolt changing carrier Thank you Mike! __________________ 1967 Nova SS LS9 800HP 1965 Malibu SS Convertible F/S 1965 Chevelle 2-Door Wagon F/S 1972 K5 Blazer 5.3



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