GM 10 Bolt 8.5" Posi Install "How To" Chevy C10 Truck - Eaton Truetrac

This is the install video of an Eaton Detroit Truetrac limited slip/posi unit into my 1987 Chevy truck with a 10 bolt 8.5" Rear End using used set of 3.42 gears from a 88-98 Chevy truck. The truck has a 5.3L (325ci) Engine and a 4l80e transmission.
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PARTS LIST WITH LINKS:
Please let me know if any of the links don't work and I'll fix them.
Purchasing through my links below don't change the items cost, but it does help support my work here on KZbin.
If you need the parts list for NBS 99-present truck, just ask in the comments.
- EATON Detroit Truetrac Posi/Limited Slip Differential 10 bolt 8.5" 28 spline axle.
FITMENT: 1972 - 1989 GM 10 bolt C-Clip 8.5" 1.20" 28 2.73 & up.
www.amazon.com/gp/product/B00...
- Differential Side Bearing Shim kit, Richmond. Says Ford on link, but It works; Ford 7.5 in./GM 7.5 in./GM 8.5 in./GM 8.2 in
www.amazon.com/gp/product/B000...
All Eaton differentials made for General Motors 8.5" and 8.6" axles require special bearings.
For axles with small bearing bores (race O.D. or 2.89"), usually found on vehicles prior to 1999 (like the ones used on the '87 Chevy truck in this video), the required bearings and races are in the two links below.
- Bearings for Eaton Carrier x2 (Older Small Bore):
www.amazon.com/gp/product/B000...
- Bearing Race for Eaton Carrier x2 (Older Small Bore):
www.amazon.com/gp/product/B001...
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
For axles with large bearing bores (race O.D. of 3.06"), usually found on vehicles from 1999 to present:
- Bearings for Eaton Carrier x2 (Newer Large Bore):
LM603049
- Bearing Race for Eaton Carrier x2 (Newer Large Bore):
LM603012
- 3 qts regular GL5 gear oil
Pick up at local auto parts store. No limited slip additive needed for the Eaton Detroit Truetrac unit.
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IMPORTANT INSTALL SPECS:
- Ring Gear Bolts (reverse thread) Torque to 65ft lbs
- Side Bearing Cap Bolts Torque to 60ft lbs
- Backlash should be .005-.009
Pinion pre-load:
- New Bearing 14-19in lbs
- Used Bearing 6-8in lbs
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BURNOUT VIDEO KILLING THE TIRES HERE:
• Big Smokey Burnout '87...
Driving video of this truck with the WELDED DIFF doing hard pulls here:
• 5.3 Swap '87 Chevy Tru...
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Keep on Wrench'n!
Mark
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Check out my other videos like this on my channel by clicking the link below:
/ agearhead4life

[@05campdaniel]

Putting bearings in the oven makes it expand and slip right on. The opposite for races. Freezing shrinks the metal. For those that may be new

[@SMOBY44]

My only 2 critiques are leaving the axles in the tubes will usually damage the oil seal because the axle is pressing against it causing it to deform, and 2nd if you're reusing your gears you need to check the backlash before removing the carrier so you can shim the new unit to the exact same lash. Other than those, great video.

[@Kornholeeoo]

Take your old bearing and get the outer cage and rollers off the inner bearing. Take a cutoff and make a cut down the side, perpendicular to the bearing. Now you have a perfect press block for the new bearings to seat them without a hammer and punch.

[@w8e0s6t]

my bad bro didn't think of readying the description lol

[@jaktheapprentice1023]

I love flip flop mechanics.

[@vegansaxon3962]

I'm wanting to regear and put a locker in my 93 suburban, and all though I have never did a gear swap, I like to do my own work..does take some special tools that cost more money, but I also have a jeep that I want to reheat, so maybe it wil be worth it..your skill level and confidence makes it look easy...oh, and my sister would like your video just based on the Glenn Danzig song playing..shes got two daughters but for some reason she loves a song with a man warning mothers to not let their children walk his way..ha ha...well, I'm not the most logical person either.

[@FCD-dl7bk]

Awesome video.........not saying that I would try it not knowing much about rear ends but I really appreciate that you were very specific on what you did and doing a visual description as you were talking just made the video so much better......thank you my friend

[@mickeymoe100]

Very well produced video. Great grammar- no "uhhhhhs" and "ummmmmmmms" every few words which is very annoying and makes you loose track of what's being explained. Thanks!

[@BobTheBreaker9]

Did you have to change the pinion?

[@bradleymorris8875]

He said … Unit !!!

[@G31mR]

I installed a Tru-Trac in my own Chevy pickup. I bought a complete installation kit that included new, larger bearings and a shim kit when I bought the Tru-Trac. The installation was seamless and easy. Took just under eight hours from driving the truck into my shop to driving it out. Several things I'll point out in this video that are not 100% always true: one, the Tru-Trac is not a Posi. Posi is short for Positrac, which is the trademark name for GM's clutch-type LSD. The Tru-Trac is a Torsen-type (worm gear) LSD. Two, it IS possible to install the Tru-Trac without the shim kit. My Tru-Trac retained its recommended backlash using the factory-installed shims, and the shim kit was not needed. That may not be the norm, but it's possible you won't need the extra shims. If you can abide having the vehicle up on jackstands while you obtain the shims, I would not buy the shim kit until you find that it is required.

[@vermili0138]

I always thought changing a carrier would be a pain in the ass, but thanks to you I have the confidence to change it myself! Thanks for the awesome video!

[@24441Chris]

Hey man great video! You really do know your stuff. Im only 16 and have a 78 shorty stepside and your videos have really helped me a lot, they sure do get me closer and closer to having my ride back on the road. Keep up the good work!

[@Don.E.63]

Good job Marine! Thank you for your service to this great nation ! And God bless you !

[@2snailz135]

Thank you sir, makes what I've always considered an intimidating job a lot easier to understand. You've given me the roadmap to do it myself instead of finding someone else to pay, as I've always done in the past. Great video tutorial.

[@tyco5176]

thanks for all the detailed info never knew hot to add posi so it really helped with all the detailes

[@dragman10]

Great videos man! I've done all this to my '78 C10 11 sec drag truck back in the early '90s. It makes me happy to see people building trucks. Chevy made such a welcoming canvas for such projects with the '73-'87 body style. Keep up the amazing work!!!!!

[@wjye]

I’ve been putting of installing an LSD for years cause I don’t have a press and nobody around me will press bearings on customer supplied parts, and I sure as hell didn’t want to pay $1000 for an install. The socket to drive in the bearing was genius and Im mad I didn’t think of it earlier. I could’ve done an LSD install so long ago!! Man you make it look easy! Thank you for this video.

[@AGearHead4Life]

Description has been updated with links to get the parts used in this video.

[@ericg3354]

one of the best vids on installing a truetrac, thanks