The Dodge Challenger Message Board

I've already checked the other threads on this subject and done the lifted tire check, but I'm STILL not sure what's going on. Here's what I found:

1) I was specifically told that the car's rearend was a "posi" (I know, not the correct Mopar term, but those are the previous owner's exact words.)
2) Both rear tires off the ground, 727 in "P", tires rotate in opposite directions and the drive shaft rotates. Significant resistance. (This seems like an open rearend to me, right?)
3) 727 in "N", passenger tire rotates, drivers' doesn't (I'm working from the passenger side of the car), driveshaft rotates. (???)

So, I'm confused. The car runs and drives fine so far as I can tell - I've only driven it about 8 miles and not pushed it hard since it still needs a few things to pass inspection and get licensed. The 727 is a standard shift patern manual valve body. Do I have possible tranny problems (wheels rotating while in "P")? Differential problems (only one tire rotates in "N")? Any thoughts are welcome.

Well it has me beat!

You are corrrect that the tranny needs rebuilding because you should not be able to rotate the wheels at all in 'P'. In fact I think you should get it fixed before using the car in anger because you don't want it to lead to something like THIS!

I would have expected that with the trans in 'N' you would have the wheels going in opposite directions. I wonder if it does indeed have a LSD unit but it is not working??

Graham, what do you think about this one? Have I got transmission problems?

Doug. I agree with the others that you should look at your transmission first. Unless the maker of the valve body for whatever reason wants the part pawl removed or non useable, the driveshaft and axles should not move when you've got the indicator in park. Drop the oil pan and check it for excessive clutch material and or excessive metal filings in it.
Even if the pan looks clean, I'd find out why you don't have park.
Keep us informed
Graham

Is your shifter linkage adjusted correctly so it will allow the park rod to enguage fully.

All good input, guys. Many thanks. I'll check the linkage first, then drop the oil pan if the linkage is OK. It may be a while before I get to it, though. Car's not "on the road" yet anyway.

It is not uncommon for a limited slip rear end to have the tires move in opposite directions. Fools even the best of us. Now try that on a spool or such and it cannot happen. I have even seen my Detroit locker turn in opposite direction, when the dogs were not engaged.