Transmissions and Drivetrain Need help with your trans? Problems with your axle?

which posi?

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Old Feb 12, 2006 | 09:45 PM
  #1  
ricky223's Avatar
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Car: 87 Firebird
Engine: 305 4bl
Transmission: 700R4
Axle/Gears: 2.73
which posi?

Which posi unit do you guys think is the best performing and the most durable? A eaton posi or auburn, or something else? For street and strip. Anybody have bad experiences with either?
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Old Feb 13, 2006 | 09:51 AM
  #2  
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The Eaton or the Auburn are both good choices for the street or strip. And they are LIMITED SLIPS not Posi units.
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Old Feb 13, 2006 | 08:56 PM
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From: Boscobel, Wisconsin
Car: 1987 Iroc-Z
Engine: 355
Transmission: 700r4 w/ about 7500 miles on rebuild
...limited slip is positraction...

Limited slip - when a certain amount torque is applied then both wheels spin

locker - when one wheel spins, the other engages

both positraction


And i have an eaton 3.73... i love it

EDIT:: Eaton makes both lockers and limited slip... i would suggest limited slip for street strip... from what i've been told/read, lockers are better for hauling

Last edited by Rabbitt; Feb 13, 2006 at 09:01 PM.
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Old Feb 13, 2006 | 09:31 PM
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Car: 1987 IROC-Z Camaro
Engine: 5.7 350 TPI - SLP Runners, AFPR, MSD Goodies
Transmission: 700R4 - Shift Kit, Corvette Servo
Axle/Gears: BW 9 bolt, 3.27s
For the love of *** please dont get a 10 bolt.
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Old Feb 13, 2006 | 10:01 PM
  #5  
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From: Boscobel, Wisconsin
Car: 1987 Iroc-Z
Engine: 355
Transmission: 700r4 w/ about 7500 miles on rebuild
built right, a 10 bolt can hold up to around 400rwhp... more than enough for most ppl on here
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Old Feb 14, 2006 | 01:23 AM
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Car: 87 Firebird
Engine: 305 4bl
Transmission: 700R4
Axle/Gears: 2.73
thanks, also i was wondering can i run 28 spline axles if i get an eaton for 28 splines? I have a 1987 10 bolt which i guess has the 26 spline and id rather be running 28.
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Old Feb 14, 2006 | 06:29 AM
  #7  
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[QUOTE]Originally posted by Rabbitt
...limited slip is positraction...

Limited slip - when a certain amount torque is applied then both wheels spin

locker - when one wheel spins, the other engages

both positraction


And i have an eaton 3.73... i love it

EDIT:: Eaton makes both lockers and limited slip... i would suggest limited slip for street strip... from what i've been told/read, lockers are better for hauling
[

Positraction is a OLD Chevolet term for a LIMITED SLIP.
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Old Feb 14, 2006 | 06:44 AM
  #8  
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From: Lower Salford, PA
Car: 1987 Camaro Z-28
Engine: 6.3L Victor EFI
Transmission: Tremec TKO 600
Axle/Gears: Moser 9"/4.11 Trac-Lok
.

Positraction is a marketing name that GM used in the 60's to sell their Limited Slip Differential. GM has not used that term since the 70's, but it seems it stuck with a lot of motorheads.
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Old Feb 16, 2006 | 01:25 PM
  #9  
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From: Boscobel, Wisconsin
Car: 1987 Iroc-Z
Engine: 355
Transmission: 700r4 w/ about 7500 miles on rebuild
bleh, to me posi = both wheels spinning
sorry.. l lol, i knew posi was the chevy way to say limited slip, ford, gm, chrysler all have their own name..
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Old Feb 16, 2006 | 02:15 PM
  #10  
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Car: 87 IROC
Engine: modded LB9
Transmission: Pro Built 700R4
I'm going with an Eaton.
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Old Feb 20, 2006 | 06:41 AM
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Originally posted by ricky223
thanks, also i was wondering can i run 28 spline axles if i get an eaton for 28 splines? I have a 1987 10 bolt which i guess has the 26 spline and id rather be running 28.
Sure, all you need to do is score a set of 28 spline axles from any 90-92 thirdgen 10 bolt rear. Also, I prefer the eaton units since they have a stronger case and are rebuildable unlike the auburns.
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Old Feb 20, 2006 | 06:21 PM
  #12  
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From: Boscobel, Wisconsin
Car: 1987 Iroc-Z
Engine: 355
Transmission: 700r4 w/ about 7500 miles on rebuild
if u are putting any amount of power to the ground, i would go with some hardened Moser axles... thats what i have
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Old Feb 20, 2006 | 11:35 PM
  #13  
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From: San Leandro(Oakland)
Car: '92 Toyota Pickup
Engine: 22R-E
Transmission: 5sp Manual
Axle/Gears: 4:??
IIRC "positraction" is short for positive traction or maybe I just made it up but that's what I have always thought.
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Old Feb 21, 2006 | 06:14 AM
  #14  
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[QUOTE]Originally posted by superGMman
IIRC "positraction" is short for positive traction or maybe I just made it up but that's what I have always thought. [/QUO

You are wrong and POSITRACTION was GM's Chevolet trade name for a LIMITED SLIP in the 60's. Slang term used by the younger ones is Posi which is incorrect.

Last edited by DJP87Z28; Feb 21, 2006 at 06:30 PM.
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Old Feb 21, 2006 | 05:15 PM
  #15  
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Car: 87 Firebird
Engine: 305 4bl
Transmission: 700R4
Axle/Gears: 2.73
posi=power to both wheels, if you know so much about limited slips why cant you spell it? LINUTED SLIP?
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Old Feb 21, 2006 | 06:30 PM
  #16  
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Car: 1987 Black IROC-Z (SOLD)
Originally posted by ricky223
posi=power to both wheels, if you know so much about limited slips why cant you spell it? LINUTED SLIP?
So I hit the wrong key and A POSI up yours. A lot more knowledge then in your quote.

Last edited by DJP87Z28; Feb 21, 2006 at 06:35 PM.
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Old Feb 22, 2006 | 03:01 AM
  #17  
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Dude, I think you seriously need to consider getting professional therapy for your hangup with people calling it posi. Gimme a break man. Are you a copyright lawyer or something? Who the hell cares what term is used as long as everyone knows what's being referred to. I bet you'd really go postal if some uninformed young pup happened to call it a Sure-Grip or something along those lines huh? Slang term used by the younger ones??? Yeah OK. I'm 35 and have always called them posi, when I don't feel like spitting out the mouthful that the word "limited slip" entails. Get over it for chrissake!
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Old Feb 22, 2006 | 06:45 AM
  #18  
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Originally posted by Pat Hall
Dude, I think you seriously need to consider getting professional therapy for your hangup with people calling it posi. Gimme a break man. Are you a copyright lawyer or something? Who the hell cares what term is used as long as everyone knows what's being referred to. I bet you'd really go postal if some uninformed young pup happened to call it a Sure-Grip or something along those lines huh? Slang term used by the younger ones??? Yeah OK. I'm 35 and have always called them posi, when I don't feel like spitting out the mouthful that the word "limited slip" entails. Get over it for chrissake!
No breaks for you DUDE, your ranting and raving over my simple correction of you errors. Note: I am not your DUDE... AH
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Old Feb 25, 2006 | 10:26 AM
  #19  
ricky223's Avatar
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Car: 87 Firebird
Engine: 305 4bl
Transmission: 700R4
Axle/Gears: 2.73
DJP87Z28 you are a nerd. Are you not?
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Old Feb 25, 2006 | 10:59 AM
  #20  
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I think it's kinda sad that this guy posted a question, and the majority of this thread is made up of people arguing about what to call something. To each his own and be done with it, try and help each other instead of fighting. I personally have an auburn unit and have never had any problems with it. Hopefully others can chime in with some HELPFUL info, good luck.
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Old Feb 25, 2006 | 11:03 AM
  #21  
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From: Ohio, near columbus
Car: 89 iroc-z
Engine: 305tpi
Transmission: wc-t5
Axle/Gears: 10 bolt 3.08 posi (4 now)
Originally posted by Pat Hall
Dude, I think you seriously need to consider getting professional therapy for your hangup with people calling it posi. Gimme a break man. Are you a copyright lawyer or something? Who the hell cares what term is used as long as everyone knows what's being referred to. I bet you'd really go postal if some uninformed young pup happened to call it a Sure-Grip or something along those lines huh? Slang term used by the younger ones??? Yeah OK. I'm 35 and have always called them posi, when I don't feel like spitting out the mouthful that the word "limited slip" entails. Get over it for chrissake!
I agee who gives a damn if you understand what he's talking about......

I know the dicitionary definition for dude would i post it, hell no it's worthless and a waste of time and brain cells.....

so is reading all the worthless non meaningful corrections i always hear on tgo.

Get a life DJP87Z28.....
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Old Feb 25, 2006 | 11:28 AM
  #22  
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From: Norfolk, VA. USA
Car: 86 Trans Am, 88 Formula
Engine: 95LT4, 305TPI
Transmission: T56, T5
I run an eaton posi
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Old Feb 25, 2006 | 11:32 AM
  #23  
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Car: 87 IROC
Engine: modded LB9
Transmission: Pro Built 700R4
Anyone know who sells them for the best price? Best I've seen is $450.
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Old Feb 25, 2006 | 12:22 PM
  #24  
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From: In the sticks near Woodland,CA, USA
Car: 91 Formula WS6
Engine: 305 TPI
Transmission: five speed
For that kinda $ you could spring an extra $50 or so and get the ultimate 10bolt posi, the Zexel Torsen T2R. You need a 28 spline set-up.

http://www.stranoparts.com

Hi Zephyr!
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Old Feb 25, 2006 | 01:05 PM
  #25  
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Originally posted by DJP87Z28


You are wrong and POSITRACTION was GM's Chevolet trade name for a LIMITED SLIP in the 60's. Slang term used by the younger ones is Posi which is incorrect.

Your right.


I would get the Eaton POSI unit over the Auburn POSI unit. I had an Auburn POSI unit and it basically blew up into alot of little POSI pieces. Now I have no POSI in my car. I plan on getting an Eaton POSI unit soon.


See DJP87Z28, you may be right but every body still knows what POSITRACTION is so get a grip.
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Old Feb 25, 2006 | 02:46 PM
  #26  
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From: arkansas
Car: 1928 dodge coupe, 64 1/2 mustang
Engine: 350,289
Transmission: munice 4 speed,c4
Axle/Gears: 9" 3.00, 9" 3.25
or you can do as i did buy a spool it is cheaper
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Old Feb 25, 2006 | 04:58 PM
  #27  
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Car: 1989 IROC-Z
Engine: 5.7L EFI LTR setup
Transmission: T-5 World Class
Originally posted by 91drag
or you can do as i did buy a spool it is cheaper
But the suck for the street

Also aren;t them Zexel units take offs ?
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Old Feb 25, 2006 | 05:08 PM
  #28  
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From: In the sticks near Woodland,CA, USA
Car: 91 Formula WS6
Engine: 305 TPI
Transmission: five speed
You used to be able to buy the take off Zexel Torsen's used in 4th gens from SLP, they are long gone. These are not the Zexel Torsen T2R, not even close! The T2R is the next best thing to a Locker, and more streetable. A spool for the street? Uh uh.
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Old Feb 25, 2006 | 05:26 PM
  #29  
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From: arkansas
Car: 1928 dodge coupe, 64 1/2 mustang
Engine: 350,289
Transmission: munice 4 speed,c4
Axle/Gears: 9" 3.00, 9" 3.25
i dont have any problems with mine and it is a lot cheaper, if you don't mind tire noise while making sharp turns. and when my car had a big block no probs breaking any thing except axles but now not using stock ones so no more prob's
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Old Feb 26, 2006 | 10:57 AM
  #30  
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Search ebay for the cheapest prices on the eaton unit. I've seen them as low as $369 from some of the big drivetrain sellers on there. Summit and Jegs can't even come close to those prices for them. Oh and sorry for getting off on a rant about the **** retentive guy who can't stand us calling them posis! I'm normally a stickler myself for spelling and the like, but he was just being plain silly "DUDE"! Lol.
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Old Feb 27, 2006 | 01:17 AM
  #31  
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From: Greenwood, Indiana
Car: 1984 Trans Am
Engine: Vortec 355
Transmission: TH-700R4
Axle/Gears: GM Axles and GM 3.73
since my car has 100,000+ miles on it i figured i would buy a kit with new gears and everything.....here is the kit that i got

http://cgi.ebay.com/ebaymotors/Eaton...QQcmdZViewItem

i don't have it installed yet because i can't find anyone to do it yet....but once i do i'll let ya know how it works out
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Old Feb 27, 2006 | 02:09 AM
  #32  
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From: Norfolk, VA. USA
Car: 86 Trans Am, 88 Formula
Engine: 95LT4, 305TPI
Transmission: T56, T5
The Zexel Torsen SLP Take Off units suck really bad when cornering hard and trying to accelerate, you end up getting the 1 wheel peel effect from the lighter wheel and I couldn't steer the car with the throttle. On the street and straight line it was great, just not good for auto-x.
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Old Mar 1, 2006 | 09:39 AM
  #33  
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Car: 87 iroc
Engine: 410 sbc
Transmission: tremec 3550
Axle/Gears: 30 spline 3.73
i would go with the eaton posi too. they seem to have the better reputation when it comes to posi units. i have ridden in cars on the street with spools and not so cool. every turn in the road the axle would pop out of lock and make a horrible clunk. my father-in-laws 68 stang has one.
i myself call it a posi, but have the knowledge to know that they are one in the same, and have to constantly tell other guys "younger" that limited slip+posi= the same damn thing. for people to get irate about the same thing with different names, is why people tend to stay away from websites or refuse to chime in and give a helping hand. so.....can't we all just get along?
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