gonna do the rear in my 91 z28 700r4 with slight stall the original 7.5 gm 10 bolt is in there now with only problems being that its worn and wont always leave two marks as well as a leaky pinon seal



gonna stick with the stock 3.23 ratio only gonna change bearings seals diff cover and the diff itself


car see street with some drag use a few times a year


undecided which to get if anyone has experience with these 3 or a better alternative please chime in on there pros and cons


eaton posi
https://www.summitracing.com/parts/e...-010/overview/


auburn pro
https://www.summitracing.com/parts/aub-542046/overview/


tru trac
https://www.summitracing.com/parts/d...a317/overview/

 

so far from what ive read



eaton posi is now made in mexico but is rebuildable



the auburn gets a bad rap all around not rebuildable


trutrac is made in tiawan, is noisy do to gear lash slop no clutch but once the worm gears wear you can toss it no rebuildable parts

 

Trutrac is quiet, not sure where you found it to be noisy. I've had one for years and it's been wonderful.

 

Take the Auburn off of the list. It's junk and should not be considered at all. I've had very few problems with the Eaton Posi. I'm not a big fan of the current carbon fiber clutches, but those can be swapped if they cause any problems. I don't have any experience with the Truetrac for drag racing, but most people say they work fine, but a few have had problems getting both tires to spin.

 

Stock zexel torsen diffs from the 99-02 fbodys are basically a true trac, and work awesome and are quiet

I have a true trac in my 12 bolt and its held up to 1200 hp no problem. Works great for drag and street

 

I have a Torsen (TruTrac knock off from China via Australia) in my 9 bolt and it's great. Works exactly as designed and is 10000000x better than that stupid cone-type I pulled out. Gear oil stays clean and you can't tell it's not an open diff till you get on it, and then it just locks up - no fuss. I can only imagine that a real TruTrac from Eaton would be just as good or better. Mine was even slightly more expensive after shipping from Australia.

GD

 

bob@brutespeed over from the 4th gen forums ls1tech


"The Truetrac use to be a very good differential until the company got bought out, sometime back around 2006. Since then quite a few people have been having this problem occur with them. Bob"


http://www.cuda-challenger.com/cc/in...topic=108729.0


https://speedtalk.com/forum/viewtopic.php?t=28090


https://www.s197forum.com/threads/tr...hatter.127878/


https://www.thirdgen.org/forums/tran...-truetrac.html




just had a drive in my buddies 4th gen 7.5 10 bolt auto stok gears and i can confirm his also had a clip clop sound coming from the rear coasting from about 30-0



also took some turns going on and off onramps to and from highways to test the turning out, although there's no noise with his unit taking turns even from a stop there was alot more alxe movement notable when on the on ramps you can hear the axles move so much that would cause the rear brakes to squeak and even grind as if the brakes were being pressed even though brakes weren't being applied

 

Powertrax no slip

 

Says stock gears...also a stock Zexel Torsen diff? Not trying to split hairs, but since the subject is the diff, I'm curious if it has a factory original or a replacement.

 

My Trutrac is a little noisy....but really it's drowned out by the exhaust.
My original Auburn did an ok job...lasted about 15 years until it finally fell apart....literally.

 

no its a 1993 camaro had an auburn in originally, all he changed was the diff and swapped the original 3.23 ring gear over

 

was also thinking of getting a torsen but the t2r i cant find a vendor, torsen does sell the t2 but want 500 bucks for it and still has the same bias as the original ones that came on the late 4th gens which is less than a trutrac

from what i read the bias is
t2r 4-1
trutrac 3.5-1
t2 2-1

might try a used torsen from a 4th gen there like 100-200 bucks on ebay and havent read anything about them having slop and making noises on coast

 

Just my 2 cents but I wouldn't but much money in a 7.5 axle. Mine finally broke the ring gear after 20 years and at least 75 1/8 mile passes. Only ran 8.20s 1/8 and 1.65 60 ft then.
It had richmond gears, torsen diff, moser 28 spline street axles and a TA cover. I went with a Hawks 8.8 with a 31 spline True trac which makes no noise at all. I agree, I would just put a Torsen in it.

 

...

 

what are your thoughts on the yukon duragrip same as eaton posi but uses different clutch material

 

The Dura Grip uses the same type of Raybestos material as the Ford Traction Lock. It seems to hold up pretty well and grips well. The Eaton and Dura Grip clutches are interchangeable. You can also use the old 18 disc steel clutches in the new Eaton Posi.

 

summit is selling the yukon now for 381 with sale and 40 buck rebate

ive been reading that eaton went to 400lbs springs when they recently changed there clutch material to carbon previous was 200lbs would you know what lbs yukon put in there carriers now?

 

I think the Yukon has 400 pound spring too. Eaton had 18 clutch discs with the 200 pound springs and 14 discs with the 400 pound springs.

 

Been running a Tru Trac for years in my 94. I have well over a 1.000 + passes down the qtr mile with it running MT Ss Drag radials.. No noise, and so far so good. Running GM 3.42 gears behind a 4L60E. The car had the factory Auburn in it when I bought it with 2.73's, was working. Had factory Torson in it when I swapped to the 3.42.s, got 3 years out of that one, unknown miles when I got it. Hope that helps..

If money is no object, ARB Air Locker !

 

When I was researching this (I went with TruTrack) I thought I read that it gave power to the wheel with traction, as opposed to the clutch style ones, that gave power to the wheel that was slipping...

 

Im also looking at getting either the eaton lsd or truetrac. I mainly street drive my car and then hit the strip. My stock auburn is now a 1 legger during burnouts. So many poeple tell me for the power Im at..not to even bother putting money into the 10 bolt. Im cutting 2.2-2.4 60fts right now being gentle. But for a quick fix I may just throw the eaton lsd in with solid pinion spacer,new axle seals/bearings with a t/a diff cover and call it a day. Its not overly expensive and can be done in a day to get the car rolling under both wheels.

My goal is to get the hawks 8.8 1 day and have a killer setup..but living in canada..my wallet hasnt grown big enough for that upgrade yet. The money for the truetrac seems quite abit more than what i want to spend and I dont see the big gain for drag racing.

Thoughts?

 

Which Eaton LSD are you talking about? The Eaton Posi, Eaton Truetrac and Eaton Governor Lock are all LSDs.

 

Posi,clutch style. This is what Im looking at with 3.55 gear:

https://www.quickperformance.com/GM-...t_p_20409.html

 

The one that is in that kit is not an Eaton Posi, it's a Yukon Dura Grip.

 

So basically stay away lol, seems alot of people prefer an eaton over the yukon?

 

I've installed a lot of the Yukon units without any problems, but I've heard of some people breaking them.

 

I am throwing alot of power at it so maybe i should stick with the eaton unit

 

QP will sell you an Eaton with that kit, but will cost a little more.

 

Where does a Trac-Loc (as installed in my D44) slot into all of this?

 

Also a clutch plate type LSD and rebuildable.

 

Would you say it's comparable to an Eaton?

 

Yes. The ones that I have disassembles had steel clutch plates and 2 pinion gears. Very similar to the Eaton Posi.

 

Big plus on the zexel. No problems at all with launches over 6000.