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Username Post: Posi Traction identification        (Topic#208325)
Uncle Rocky 
Member
Posts: 142

Loc: Frankfurt, Germany
Reg: 07-18-06
01-27-09 12:37 AM - Post#1616622    

I just got a 10 bolt rear end out of a 92 Z28 (TPI 305 with a 700R4) and was wondering if it has "true" posi-traction. Will it spin both tires on dry pavement? How can I identify it?

Roger
1955 Belair 454/700R4,AC,12 Bolt Posi
1949 Ford F1 truck with 84 Monte Carlo clip
1930 Ford Model A Coupe with a BMW V-12


 
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Mister Blue 
"2nd Year" Silver Supporting Member
Posts: 887

Loc: Duluth, MN
Reg: 12-04-07
01-27-09 05:11 AM - Post#1616654    
    In response to Uncle Rocky

Jack up the rear end. Out of park or gear. Turn a rear wheel. If they turn in the same direction its posi. If they turn in the oppisite direction its non posi.

 
Uncle Rocky 
Member
Posts: 142

Loc: Frankfurt, Germany
Reg: 07-18-06
01-27-09 06:54 AM - Post#1616710    
    In response to Mister Blue

That's too easy. And count the number of tire rotations versus the drive shaft rotations to get a "ball park" rear end ratio.....true?

Thanks for the information. I'll try it tonight.

Roger (aka Uncle Rocky)
1955 Belair 454/700R4,AC,12 Bolt Posi
1949 Ford F1 truck with 84 Monte Carlo clip
1930 Ford Model A Coupe with a BMW V-12


 
Uncle Rocky 
Member
Posts: 142

Loc: Frankfurt, Germany
Reg: 07-18-06
01-28-09 03:37 AM - Post#1617493    
    In response to Mister Blue

Mister Blue,

I tried this last night on a "known" posi traction car....My big block 55 Belair with a 12 bolt posi and as I turned the wheel by hand the other one turned in the opposite direction. I can lay down very long (two wheel) burn-outs with this car and your solution did'nt add up in this case. So I'm back to the original question. How can I identify a Chevy posi traction rear end?


Roger
1955 Belair 454/700R4,AC,12 Bolt Posi
1949 Ford F1 truck with 84 Monte Carlo clip
1930 Ford Model A Coupe with a BMW V-12


Edited by Uncle Rocky on 01-28-09 03:38 AM. Reason for edit: No reason given.

 
Mister Blue 
"2nd Year" Silver Supporting Member
Posts: 887

Loc: Duluth, MN
Reg: 12-04-07
01-28-09 05:00 AM - Post#1617503    
    In response to Uncle Rocky

Th ats how I have always read its done. It has worked for me. I could also lay down three or four feet of rubber marks and thought mine was a posi. Took it apart to change gear ratios and it was not.

Maybe someone else can give some advice.

 
Mister Blue 
"2nd Year" Silver Supporting Member
Posts: 887

Loc: Duluth, MN
Reg: 12-04-07
01-28-09 05:20 AM - Post#1617506    
    In response to Mister Blue

Just found out that there are some posis that will turn in the oppisite direction. Try blocking one tire to hold it and then see if the other wheel will turn. Some cases have a big P on them.
P for posi.

 
raycow 
Honored Member
Posts: 18480

Age: 71
Loc: San Francisco, CA
Reg: 11-26-02
01-28-09 11:59 AM - Post#1617734    
    In response to Uncle Rocky

Over the years a lot of people here have posted the "same direction - opposite direction" method to tell if a rear has posi, and it just isn't reliable.

Instead, jack ONE wheel off the ground and put the transmission in neutral. Now try to turn the wheel by hand. A good posi will be difficult or impossible to turn. An open rear (or a badly worn posi) will turn easily.

There is one exception to this, and that is the Gov-loc rear used on some of the trucks. This is a centrifugally-operated design that behaves like an open rear until a spinning wheel reaches a certain speed. Only then does the posi engage, and the engagement can be quite violent. Understandably, this feature is not popular with off-roaders, so a lot of these rears get replaced with normal posis or lockers.

Ray
Bacon is the gateway drug for vegetarians - Bridget Lancaster


 
route55 
Contributor
Posts: 317
route55
Age: 60
Loc: Minnesota
Reg: 05-17-07
01-28-09 02:46 PM - Post#1617844    
    In response to Uncle Rocky

For about $20(US), I'd just buy a new gasket & lube and pull the cover off and take a look. (If it's a posi, you'll need new posi additive too).
55 Belair HT 396-L78 BB, 4sp Muncie, 12 bolt Posi.


 
J.brown 
Forum Newbie
Posts: 10

Age: 53
Loc: phoenix
Reg: 04-14-12
02-22-13 03:40 PM - Post#2319649    
    In response to route55

Smartest reply Ive seen.

 
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