I have a 90 xj, 4.0 aw4 np231. with 2 inch lift front and 3 in the rear. Anyone ever have a problem with there flowmaster super 44 rubbing on there driveshaft? I've had it for two years now and have never had a problem till just a few months ago. I took it off for now so its just straight piped which I don't like, I would like to solve this so I can have my 44 back. Thanks

 

loose exhaust pipe at motor or bent hanger

 

Could a mount have rusted off and snapped?

I've had similar things happen, although they never rubbed the d-shaft. It just made the exhaust sit funny other places.

 

Nothing has rusted off..yet. And exhaust pipe is all bolted on tight. I haven't had it off roading much within the last year to actually bend anything.

 

the bolt were the exhaust pipe bolts to the manifold are prone to getting loose see if there tight grab the exhaust and wiggle it

 

okay I will, although it has a header in it now, its not the stock exhaust manifold. But I'll give everything a check over again. Thanks for all the answers soo far.

 

Sometimes mufflers have offset ends, or one end is offset.

So if the Flowmaster has center inlet & outlet, maybe it (the old stock muffler) had offset ends before. It might only be an inch or two, but if it's hitting the drive shaft, that might be why.

 

He said he's had it on for 2 years and all of the sudden it started rubbing.

I doubt that has anything to do with the problem.