62: How can you tell if the rear is a posi- traction?

[Ed P.]

I do not know what kind of rear i have in my 62. Can some one give me a clue of how to find out?

Ed

[Edward B.]

Re: 62: How can you tell if the rear is a posi- traction?

Place transmission in first gear, bring the engine up to 4000 rpm, release the clutch and count the number of tire tracks. Two tracks will indicate a limited slip differential is present and you will have enjoyed the experiment.

[Ed P.]

Re: 62: How can you tell if the rear is a posi- traction?

Can not do that now, it is on blocks and off the ground.

[Steven B.]

Re: 62: How can you tell if the rear is a posi- traction?

Can not do that now, it is on blocks and off the ground.

In the mean time, if the car has its rear wheels off the ground and you turn one wheel, a positraction rear end will cause both wheels to turn in the same direction. In a non-positraction the wheels will turn opposite of each other. The differential is stamped or marked on the axle tube on the passengers side. It may be a little difficult to find. The first two letters should be the axle code suffix numbers. If you can find them, you should be able to identify the ratio by googling axle suffixes. If I am in err, I'm sure someone will be able to correct me. I am not sure if the suffixes are the same for 10 and 12 bolt rear ends. There are also numerical codes cast into the center section that will indicate casting dates, times, etc. Information for those can be accessed by searching for 10-12 bolt identification.
Good luck,
Steve

[Dino L.]

Re: 62: How can you tell if the rear is a posi- traction?

There will be a large P on the third member and you will have a vent tube and pipe that goes across the differential.

[Terry D.]

Re: 62: How can you tell if the rear is a posi- traction?

Ed
Can you post pictures of the numbers on the drop out section? And just because there is no "P" on the section does not mean it is not a posi. While car is up on blocks I would pull the rear end, you can inspect it and determine exactly what you have, also check the axle bearings, clean out the center section, check axles for straightness and start with new rear end lube.
Terry

[Ed P.]

Re: 62: How can you tell if the rear is a posi- traction?

Steve thank u very much for the help, sorry i did not get back to you guys sonner, but i was in the hospital with a bad blatter infection. And thanks to the others who help except boyd.

[Ed P.]

Re: 62: How can you tell if the rear is a posi- traction?

Dino i do not know what the third member is? Can you clarify please.

[Edward B.]

Re: 62: How can you tell if the rear is a posi- traction?

Can you suggest a faster or easier test to determine if an operative Positraction unit is installed? If so, please explain what it is.

[Eric E.]

Re: 62: How can you tell if the rear is a posi- traction?

Dino i do not know what the third member is? Can you clarify please.

Here is a picture of a P case carrier for a 62 posi.

As as others have said, you might have a non posi carrier (no P) that someone has modified to be a posi. If you want a "correct" posi unit it needs to be a thin P. As always, check your NCRS Tech/Judging Guide.

[Mark E.]

Re: 62: How can you tell if the rear is a posi- traction?

Can you suggest a faster or easier test to determine if an operative Positraction unit is installed? If so, please explain what it is.

See post #4.

[Edward B.]

Re: 62: How can you tell if the rear is a posi- traction?

That's all fine if you have access to a lift, wheels off the ground, etc. But if you're in the field evaluating a vehicle for purchase and have limited time and equipment for examination the drive test works well. No matter what the outward appearance of the differential may indicate ("P" symbol, air vent, etc), there's no way of knowing what really lies within or if it is an operational unit; all of which are important to know before making an offer. Is there some objection to having the driveline demonstrate it capabilities?

[Patrick B.]

Re: 62: How can you tell if the rear is a posi- traction?

Can not do that now, it is on blocks and off the ground.

With wheels off the ground and trans in neutral wheels will turn the same direction with posi and if you put the trans in gear you will not be able to turn either rear wheel if it has posi.

[Duke W.]

Re: 62: How can you tell if the rear is a posi- traction?

If the wheels are off the ground, place the transmission in top gear or Park if a PG. Use a torque wrench on a lug nut to turn one wheel . If the axle is Positraction and in good health it should take at least 35-40 lb-ft to break the wheel loose and turn.

[Eric E.]

Re: 62: How can you tell if the rear is a posi- traction?

You should have someone go over it for you if your looking at a unit for purchase and you are that unsure of the mechanical condition.

It's a small price to pay compared to what it might cost you later.... been there, done that.