Engine/Transmission (1994 - 1998) How to tell if Positraction

[mkhenry]

Newbie question. I just bouight my son's 1994 3500 and he bought a 1998 2500 4X4. Both CTD. We're a 2 CTD family now. Got a question. How do I tell if the rear end in my 3500 is positraction or whatever Dodge calls theirs. I know I could just dump the clutch and count the burnout marks but there has to be an easier way.

Thanks

 

[bpenrod]

Not sure on the newer stuff but used to be if you lifted both tires off the ground and spun them you could tell. If the other tire spins the same way it is limited slip and if it spins the other it and open diff. Not sure if that applies to the truck axles but worked for the cars I played with a while back.

 

[Neibe]

Look at the underside of the hood I believe you will all the goodies right there . Can't get much easier than that. I think you can also jack up the back wheels and spin the tire if the other one turns the same way it has the Anti spin differential.

 

[Missouri Mule]

Neibe and bpenrod are right about jacking truck and spining wheels it will tell if is anti-spin or not. It should be on hood tag and coded in serial number.



mkhenry,

Burning rubber then looking to see how many marks it leaves won't tell you if it has anit-spin rear end.



I had use of a 68 Plymouth it would burn 8 ft of rubber and it had an open differential. It just depends on much traction under each tire.

If you want a real life test. You could always find a mud hole and see if the both tires would spin. (With one in the mud the other on hard land)

 

[Cooker]

Originally posted by Missouri Mule

Burning rubber then looking to see how many marks it leaves won't tell you if it has anit-spin rear end.



I had use of a 68 Plymouth it would burn 8 ft of rubber and it had an open differential.

I wish I was that lucky. I have never had an open differential in a vehicle that I could get both tires spinning on dry pavement, or wet pavement for that matter.

 

[GerryDrake]

Don't know how long they have done this, but on my '03, in the glove box, on the back of the door surface, there is a tag that lists several of the options, including the 'anti-spin' as they are now calling it. I confirmed how well mine works on a dirt road, doing about 30 in 3rd gear and flooring it, looked in the rear view and saw 4 nice parallel tracks... Haven't tried the neighbor's grass yet, but... .

 

[mkhenry]

I didn't see anything about the rear end being open or posi on the under hood decal or in the glove box. So, I got on a dirt road, tached it up a bit and let out on the clutch. Left 4 nice spinning tire marks. Posi I guess...