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Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Transmission - Rearend> Pro's and Con's of Positraction?
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Topic Review (Newest First)
06-04-2005 08:22 PM
Old School Nut I dunno about that, I drive a 66 chevy year round through WI winters and even with 420 lbs of sand next to the tailgate I have found myself going down roads sideways till the right rear tire hits the curb or the gravel on the side of the road... nothing you can do really. intersections can be outright horrible when the roads were plowed AFTER the snow has already been packed down. and it does not help they don't allow studded tires here.

one thing I would like to say that I don't think any1 else said is the tranny and its affect on the rear end. I have a shift kit, and it does NOT help with traction in the winter. when you are accelerating from 1st gear at an intersection the nice positive shift we all love in the summer can be enough to kick the vehicle sideways in an instant in the winter, its bad with a one legger, and its worse with posi.. I never thought about it till I found this out when it happened to me and I found myself in a corn field facing the direction I came...

just something to think about...

-Leo-
06-04-2005 08:22 PM
Old School Nut Oops double post
06-04-2005 01:10 AM
wshinn
Quote:
Originally Posted by BOBCRMAN@aol.com
In a nose heavy car on icy streets, a posi will pull you to the lowest part of the street. You will follow the curb and gutter till you get to an intersection then after the intersecyion its back to the gutter again. The rear slides to the lowest point or till there is traction enuff to push the front wheels. One morning in January many years ago I experienced this strange happening. Three day old big block Nova with factory tires, on city streets, in a Michigan ice storm. Walking would have been faster.
Had this experience too with posi traction, so I can attest it can be a real problem. With three or four hundred pounds of weight in the trunk the posi transforms from a slip-and-slide mobile to a get-up-and-go machine!
01-21-2005 04:38 PM
bluesman123 I don't know if they all do it, but mine does and I know it is a posi 'cause I've had it open. If I spinn them faster then they lock together. If your Blazer is the 4x4 model, I heard they all had posi's.

Dave
01-21-2005 10:29 AM
70bird I've only read the first page of replys. My appologies if this has already been addressed.

How can you tell what kind of diff you have without opening it up? The guy I bought my blazer from said it had a locker in the rear but when it is lifted up the tires still spin in opposite directions. Do posi's behave this way? I know opens behave this way and I thought that lockers do not. The limited slip in my Firebird will allow me to spin one wheel without the other moving when in the air. I heard from another person (who is usually just talking out of his ***) that a locker (maybe a posi) will behave like an open when in the air but if one tire is held, the other will be locked in with it. This is the scenerio with my Blazer. I no longer have a vehicle with a known open diff to test how it behaves in this situation.

Sorry if this has already been addressed. I'll find out when I have time to read this post tonight.
12-09-2004 08:47 PM
ecrusch1987 I'd replaced my spidergears and such my first try sucessfully.... though i was only 16 at the time I put a Power-trak in my El Camino when the posi fried... it was going fine till i learned the hard way why reving your motor to 6500 in neutral and then slamming it into L1 wasn't a good idea (shredded the trans)

As long as you know how to follow directions you should be fine, if you can find it Horse Power TV did an episode where the put one in a car...

Eric
12-09-2004 06:25 PM
Aegis
Quote:
Originally posted by dmc12mk3
...shimming and how it relates to ring and pinion gears. Takes an experienced hand to do it right and avoid whining or excessive wear from the gears.
I'm certainly not an experienced hand, but I'd like to get to know how to do it...other than simply starting to play with them (I haven't the resources to play with rear ends like that) how would I go about learning this stuff? Any good books/resources/manuals or something to start off with?
12-09-2004 11:28 AM
Ed ke6bnl
Quote:
Originally posted by dmc12mk3
You know how Kleenex is just a brand name for a type of facial tissue?


Thats how the name Positraction is to limited slip differentials.


The easiest way to install one is to swap out the entire rear axle with another one that has it in there. Otherwise you risk an opportunity to learn all sorts of details about shimming and how it relates to ring and pinion gears. Takes an experienced hand to do it right and avoid whining or excessive wear from the gears.
I have to agree with you and for my boys 4x4 we got a front and rear axle set with posi rear and the 4.10's we wanted for $175 the set. but I keep reading about EZ lockers and power trax that install in the place of the spiders I believe and they say there is no disruption of the ring and pinion settings and no need to shim or change anything. What the thouht on these options. Ed ke6bnl
12-09-2004 09:22 AM
dmc12mk3 You know how Kleenex is just a brand name for a type of facial tissue?


Thats how the name Positraction is to limited slip differentials.


The easiest way to install one is to swap out the entire rear axle with another one that has it in there. Otherwise you risk an opportunity to learn all sorts of details about shimming and how it relates to ring and pinion gears. Takes an experienced hand to do it right and avoid whining or excessive wear from the gears.
12-09-2004 08:07 AM
Yub350 I have a few questions about posi. They might have already been answered, but just want a better understanding. Thanks

1. my 85 gmc is used as a daily driver pickup. Which would be better for it, posi or limited slip? Im looking for something with a quick start and nice burnouts.
2. My axles are probley from 85, should i replace them or will they be fine. They have suffered alot of with only one wheel spinning.
3. Which brand of posi/limited slip would be the most easiest to install? Ill be the one installing it.

My rear end is a 8.5, 28 spline. Also i want to keep my 3.73 gears.

Thank for the help.
12-08-2004 08:55 PM
Ghetto Jet
Quote:
Originally posted by Aegis
I'd like to give my current one some mobility in the snow. Suffice to say I get honked at sometimes when trying to get going & move through an intersection after having stopped at said intersection.
Three Words: Studded Snow Tires. I ran them on my Caprice through one bad winter, and my mom has run them on her Caprice every winter for the last ten years. Both cars have open rears. They really make a difference on snow and ice.
12-08-2004 05:17 PM
lightemup Having a posi track in my truck which has NO weight in the back end, it can be kinda scary. Hotrodding it is fun but i spin tires on accident alot too. In the rain i dont even drive it. Everytime i get on the gas when its wet i completely lose control. Other than that its fun leaving 2 strips of rubber when all my buddies only do 1.

12-05-2004 01:57 PM
Robinson Robin
Quote:
Originally posted by Aegis
My first car was an '87 Caprice SEO (cop car) with, as I'm told, positraction. It was definitely slow going around curves in the snow & ice, but man it was fun in snow-covered parking lots & dirt roads in the summer time.

Anyway, I know very little about cars in general, so I've a few questions:

1) Is positraction considered a type of limited slip differential?
2) What, in your opinion, is the best choice for winter-time traction? What type of differential (is that the correct term? lol) would be best for maneuvering around icy, snowy city streets?

Right now, I have a '92 Grand Marquis and since a new car is out of the question, I'd like to give my current one some mobility in the snow. Suffice to say I get honked at sometimes when trying to get going & move through an intersection after having stopped at said intersection.
Yes posi traction is a type of limited slip, it was gm's term for it just like dodge called theirs sure grip. Your cheapest way to improve you traction is to get a used axle or carrier off a marquis or a crown vic and have it installed. If course the trade off as already mentioned will be more touchy handling as both rear wheels will brake loose if not gental with the trottle in corners etc. This is a trade of will almost all traction aids how ever factory type limited slips are for the most part the most forgiving.
12-04-2004 01:08 PM
Aegis My first car was an '87 Caprice SEO (cop car) with, as I'm told, positraction. It was definitely slow going around curves in the snow & ice, but man it was fun in snow-covered parking lots & dirt roads in the summer time.

Anyway, I know very little about cars in general, so I've a few questions:

1) Is positraction considered a type of limited slip differential?
2) What, in your opinion, is the best choice for winter-time traction? What type of differential (is that the correct term? lol) would be best for maneuvering around icy, snowy city streets?

Right now, I have a '92 Grand Marquis and since a new car is out of the question, I'd like to give my current one some mobility in the snow. Suffice to say I get honked at sometimes when trying to get going & move through an intersection after having stopped at said intersection.
11-20-2004 12:53 AM
NXS
Quote:
How expensive would positraction be for a '73 Malibu with a 700r4 innit?
About 5 6011's and two jugs of 80w90!

At least that's my favorite. I just love turning sharp in a paring lot and the tires go chirp, chirp, chirp


-ps- a posi more than doubles the avaliable traction... just something to keep in mind.
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