4th gen posi vs 3rd gen posi ?
01-18-2011, 09:23 PM
#1
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4th gen posi vs 3rd gen posi ?
arent they the same? I saw some members here us 4th gen posi are they better than the 3rd gens? I noticed my posi started to act funny sometimes it spins both wheels and sometimes it starts to spin both but then one will hold and the other keep on spinning
01-18-2011, 10:30 PM
#2
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Re: 4th gen posi vs 3rd gen posi ?
Kind of funny I was curious about this today too. I think the 4th gen's use a different style because the 3rd gen's had quite a few problems. Hence why they put the dana 44 in some under factory warranty. Someone will post that knows more though.
01-18-2011, 10:40 PM
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Re: 4th gen posi vs 3rd gen posi ?
Yeah. The axle tubes are wider though so it will affect your current tire position
01-18-2011, 10:50 PM
#6
01-18-2011, 11:10 PM
#7
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Re: 4th gen posi vs 3rd gen posi ?
AFAIK,4th gen through 1997 used the same carrier as
1990 up 28 spline 3rd gen,an "auburn"cone type posi.
In '98 the"torsen"spiral gear type posi was introduced
I bought a torsen carrier that came from a '99 z28
rear and test fit it in a spare '90 housing i had handy
-it all looked good
i was going to install this carrier
into the original axle of my'82(to replace a gov-lock
that works great but i do not trust
)
Got sidetracked by a tranny drop and repair,so maybe
the carrier swap will happen this year....
Kinda curious how the torsen will behave..
1990 up 28 spline 3rd gen,an "auburn"cone type posi.
In '98 the"torsen"spiral gear type posi was introduced
I bought a torsen carrier that came from a '99 z28
rear and test fit it in a spare '90 housing i had handy
-it all looked good
i was going to install this carrierinto the original axle of my'82(to replace a gov-lock
that works great but i do not trust
)Got sidetracked by a tranny drop and repair,so maybe
the carrier swap will happen this year....
Kinda curious how the torsen will behave..
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01-19-2011, 12:23 AM
#9
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Car: 1988 camaro z28,1997 camaro lt1
Engine: 355 afr 195 heads,tpis big mouth
Transmission: 700r-4 built by me 3-4 z pack
Axle/Gears: 3.42
Re: 4th gen posi vs 3rd gen posi ?
I have never see a Dana 44 rearend installed under warranty it the 10 years I was at Chevy
Last edited by antoine; 01-19-2011 at 12:26 AM.
01-19-2011, 06:51 AM
#10
Re: 4th gen posi vs 3rd gen posi ?
https://www.thirdgen.org/forums/tran...-10-bolts.html
JamesC
01-19-2011, 09:24 AM
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Re: 4th gen posi vs 3rd gen posi ?
Info here may assist in your decision-making:
https://www.thirdgen.org/forums/tran...-10-bolts.html
JamesC
https://www.thirdgen.org/forums/tran...-10-bolts.html
JamesC
01-19-2011, 09:45 AM
#13
Supreme Member
Re: 4th gen posi vs 3rd gen posi ?
Depending on your axle spline count get one of these and call it a day.
http://www.summitracing.com/parts/DTL-911A415/
http://www.summitracing.com/parts/DTL-912A317/
Forget about getting used carriers.
http://www.summitracing.com/parts/DTL-911A415/
http://www.summitracing.com/parts/DTL-912A317/
Forget about getting used carriers.
01-19-2011, 02:02 PM
#14
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Car: 1991 Chevy Camaro RS
Engine: 350 TPI
Transmission: 700R4,
Axle/Gears: 3.73 w/SLP Zexel Torsen Limited Sli
Re: 4th gen posi vs 3rd gen posi ?
I have a 4th gen zexel torsen limited slip in my RS. I bought it new from SLP back when they were making them for the 4th gen SS conversions. Its a pretty good unit. It acts like a poor mans traction control. The way it works is if one tire starts spinning the worm gears move in or out and divert some of the torque to the other wheel. When i go to take off and have wheel spin I can feel it as it make the rear of the car shimmy a bit.
01-19-2011, 02:38 PM
#15
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Car: 1992 RS
Engine: Carbed 350
Transmission: 700R4
Axle/Gears: 3.42 posi
Re: 4th gen posi vs 3rd gen posi ?
I'm certainly no expert here, but I do remember seeing that earlier rears were 7.5in and later rears 7.625. The ZT's from the 4th gens were definitely 7.625 as far as I know. Although I think that the 3rd gen's posi units would swap between 7.5 and 7.625, there might be an issue putting the 7.625 ZT stuff from a 4th gen into a 7.5 early 3rd gen rear.
Like I said, I'm not sure at all - I could be totally wrong - just throwing it out there for consideration.
Like I said, I'm not sure at all - I could be totally wrong - just throwing it out there for consideration.
01-19-2011, 02:48 PM
#16
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Car: 1991 Chevy Camaro RS
Engine: 350 TPI
Transmission: 700R4,
Axle/Gears: 3.73 w/SLP Zexel Torsen Limited Sli
Re: 4th gen posi vs 3rd gen posi ?
Thats just the ring gear size. The housing didn't change. so you can swap pretty freely from 1982 to 2002.
Also s series truck used the same rear as well. I have gotten many a 3.73 gear set from s series trucks.
Also s series truck used the same rear as well. I have gotten many a 3.73 gear set from s series trucks.
01-19-2011, 04:03 PM
#17
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Car: 1992 RS
Engine: Carbed 350
Transmission: 700R4
Axle/Gears: 3.42 posi
Re: 4th gen posi vs 3rd gen posi ?
OK - now I know. Told ya I didn't know what I was talking about! 
01-19-2011, 10:49 PM
#18
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Car: SOLD IT. Mopar guy only now.
Engine: gone
Transmission: gone
Axle/Gears: gone
Re: 4th gen posi vs 3rd gen posi ?
Depending on your axle spline count get one of these and call it a day.
http://www.summitracing.com/parts/DTL-911A415/
http://www.summitracing.com/parts/DTL-912A317/
Forget about getting used carriers.
http://www.summitracing.com/parts/DTL-911A415/
http://www.summitracing.com/parts/DTL-912A317/
Forget about getting used carriers.
01-19-2011, 11:36 PM
#20
Supreme Member
Re: 4th gen posi vs 3rd gen posi ?
Dana 44 was avalible from dealer parts at certain times,
but the avalibility seemed to be erratic-seems they were
avalible '82-84,disappeard for a while then came back...
Back in '93 or '94,summit sent me a flyer offering a
limited supply of leftover SLP dana 44s for something
like $600-i tried to get one but they were all gone....
but the avalibility seemed to be erratic-seems they were
avalible '82-84,disappeard for a while then came back...
Back in '93 or '94,summit sent me a flyer offering a
limited supply of leftover SLP dana 44s for something
like $600-i tried to get one but they were all gone....
01-20-2011, 12:30 AM
#21
04-02-2012, 05:15 PM
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Car: 1986 Firebird
Engine: 5.0L V8
Transmission: T-5
Axle/Gears: 2.73
Re: 4th gen posi vs 3rd gen posi ?
http://www.hawksthirdgenparts.com/ca...osiunit-1.aspx does anyone know if this would be a good axle upgrade? and what gears would be best to go along with a T-56 swap? I was thinking 3.73 cuz I still wanna drive it on the street. (infact Im not the best at driving stick yet so I dont plan on racing for awhile lol)
Last edited by Trevmust; 04-02-2012 at 05:15 PM. Reason: spelling errors
04-02-2012, 05:46 PM
#23
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Car: 1989-92 FORMULA350 305 92 Hawkclone
Engine: 4++,350 & 305 CIs
Transmission: 700R4 4800 vig 18th700R4 t56 ZF6 T5
Axle/Gears: 3.70 9"ford alum chunk,dana44,9bolt
Re: 4th gen posi vs 3rd gen posi ?
Dana 44 was avalible from dealer parts at certain times,
but the avalibility seemed to be erratic-seems they were
avalible '82-84,disappeard for a while then came back...
Back in '93 or '94,summit sent me a flyer offering a
limited supply of leftover SLP dana 44s for something
like $600-i tried to get one but they were all gone....
but the avalibility seemed to be erratic-seems they were
avalible '82-84,disappeard for a while then came back...
Back in '93 or '94,summit sent me a flyer offering a
limited supply of leftover SLP dana 44s for something
like $600-i tried to get one but they were all gone....
04-02-2012, 08:46 PM
#24
Supreme Member
Re: 4th gen posi vs 3rd gen posi ?
the flyer with the Dana 44s for around $600 was a
closeout special-i still regret missing out on those-
they did not include brakes and IIRC,had 3.54 ratio.
closeout special-i still regret missing out on those-
they did not include brakes and IIRC,had 3.54 ratio.
04-03-2012, 08:39 AM
#25
Re: 4th gen posi vs 3rd gen posi ?
http://www.hawksthirdgenparts.com/ca...osiunit-1.aspx does anyone know if this would be a good axle upgrade? and what gears would be best to go along with a T-56 swap? I was thinking 3.73 cuz I still wanna drive it on the street. (infact Im not the best at driving stick yet so I dont plan on racing for awhile lol)
Decide on which one you like, then shop around for the best deal.
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