Hi everyone - I'm new here. Not to forums or wrenching. I own a busy 5 bays shop specializing in Subarus and other imports. Anyway I have a project 86 Trans Am and decided to change my final drive from the factory 2.77 to 3.70.

I started out with a "rebuilt" 3-series carrier from 9bolt.com. It lasted about 2500 miles (wouldn't say it actually "lasted" at all though) before the carrier cones disintegrated into
a large amount of cast iron slurry. This was behind a stock TPI 305 and a slipping automatic. I'll post about that experience in another section one the forum. The guy won't respond to my email....

I got a Torsen (Eaton Truetrac knock off) carrier from Supa F Spares in Australia and it dropped right in with just minor clearancing of the pinion head. This thing absolutely rocks. I couldn't be happier. This carrier is a product they sell for Holden Commodores and Nissan Skylines in Australia. It's sold under their "Torqueline" differential brand:

https://supafspares.supplies/torqueline-differential/

Dave at Supa F was extremely helpful and the shipping was fast. The carrier was at my door in about 4 days via DHL. Total cost shipped was $530 USD. They accept PayPal. Contact Dave to get one:

Dave@supafspares.com.au

I'll post some pics up here in a bit. I didn't take many as I was in a hurry to get that rebuilt 3 series from 9bolt.com out of there along with the silver paint it filled my axle with. At any rate it's just a carrier install we have all seen it before. Nothing unusual about it.

This was an excellent way to get a proper Truetrac without spending a fortune on a new 8.8 or 9" that I don't need. The Australian guys runs these behind 500 HP RB30DET's with blowers. The 7.75 9 bolt is actually quite strong. When I tore down the 2.77 after 150k miles and 30 years it showed no wear whatsoever. I didn't even change the wheel bearings. With the Torsen carrier, the Yukon 370 gears, and a selection of bearings, shims, seals, etc from Ratech, the cost was around $1,000 in parts. That's about 1/3 to 1/4 of the cost of an 8.8 from Hawks when you figure adding a truetrac, brakes, shipping, etc. Even if you buy tools and have to learn R&P setup it's much cheaper and worth the learning experience.

Rick

 

Well this is quite the surprise. I bought the leftside wheel seal from autozone (yes they sell it). Part number is Yukon 30267. As I'm comparing both the left and rightside, they look absolutely identical.

 

If you look at the inside of the seal, one side is spiraled one way, and the other is spiraled the other way.

 

Also, there is usually a part or component number on the seals...
Usually on the lip or other areas made of the same rubber or synthetic material.
See if both seals have the same number on them.
Hopefully they do not; and you have a seal for each side of the differential housing.

 

edit: double post