View Poll Results: best 7.5 gm 10 bolt rear differential
eaton posi
9
26.47%
auburn
2
5.88%
truetrac
19
55.88%
other
4
11.76%
Voters: 34. You may not vote on this poll
EATON POSI vs AUBURN vs TRU TRAC
#1
EATON POSI vs AUBURN vs TRU TRAC
gonna do the rear in my 91 z28 makes 320-340 rwhp 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 aswell 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/
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/
#2
Re: EATON POSI vs AUBURN vs TRU TRAC
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
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
#3
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Car: 86 Trans Am, 92 Firebird
Engine: 408 sbc, 3.1L of raw power
Transmission: TKO600, T5
Axle/Gears: Moser 9", 3:70 trutac, 3:23 torsion
Re: EATON POSI vs AUBURN vs TRU TRAC
Trutrac is quiet, not sure where you found it to be noisy. I've had one for years and it's been wonderful.
#4
Re: EATON POSI vs AUBURN vs TRU TRAC
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.
#6
Supreme Member
iTrader: (1)
Re: EATON POSI vs AUBURN vs TRU TRAC
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
GD
#7
Re: EATON POSI vs AUBURN vs TRU TRAC
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
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#9
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Car: 1988 Trans Am
Engine: L03
Transmission: 700R4
Axle/Gears: 10 Bolt 2.73 Open
Re: EATON POSI vs AUBURN vs TRU TRAC
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
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
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.
#11
Re: EATON POSI vs AUBURN vs TRU TRAC
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
#12
Re: EATON POSI vs AUBURN vs TRU TRAC
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
#13
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Car: 85 Z28
Engine: ZZ-3,Mini-Ram, Holley EFI
Transmission: 700-R4
Axle/Gears: Hawks 8.8
Re: EATON POSI vs AUBURN vs TRU TRAC
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.
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.
#15
Re: EATON POSI vs AUBURN vs TRU TRAC
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.
#16
Re: EATON POSI vs AUBURN vs TRU TRAC
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.
#17
Re: EATON POSI vs AUBURN vs TRU TRAC
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?
#19
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Car: 94 Z28
Engine: 5.7 LT1
Transmission: 4L60E
Axle/Gears: 3.42
Re: EATON POSI vs AUBURN vs TRU TRAC
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 !
If money is no object, ARB Air Locker !
#21
Supreme Member
Re: EATON POSI vs AUBURN vs TRU TRAC
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?
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?
#23
Supreme Member
Re: EATON POSI vs AUBURN vs TRU TRAC
Posi,clutch style. This is what Im looking at with 3.55 gear:
https://www.quickperformance.com/GM-...t_p_20409.html
https://www.quickperformance.com/GM-...t_p_20409.html
#25
Supreme Member
Re: EATON POSI vs AUBURN vs TRU TRAC
So basically stay away lol, seems alot of people prefer an eaton over the yukon?
#27
Supreme Member
Re: EATON POSI vs AUBURN vs TRU TRAC
I am throwing alot of power at it so maybe i should stick with the eaton unit
#29
Supreme Member
Re: EATON POSI vs AUBURN vs TRU TRAC
Where does a Trac-Loc (as installed in my D44) slot into all of this?
#31
Supreme Member
Re: EATON POSI vs AUBURN vs TRU TRAC
Would you say it's comparable to an Eaton?
#33
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Car: Got me a nice little '86 Z28.
Engine: A brand new 350 with a forged lower
Transmission: 5 speed, TKO600.
Axle/Gears: 10 bolt 373 modified zexel.
Re: EATON POSI vs AUBURN vs TRU TRAC
Big plus on the zexel. No problems at all with launches over 6000.
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