I need to buy some rear diff bushings and can't decide which ones to buy.

I have read a lot of complaints about the delrin or HDPE because they are too stiff.

My car is going to be driven on the street but not daily and will see track time rarely.

What would you guys recommend?

 

I'd like to know this too.

The Mazdatrix Competition mounts seem like a decent alternative to stock... Cost is actually a couple bucks less for the failure prone front mount.

Has anyone dealt with NEW OE mounts versus NEW Comp mounts? Both the front mount and the two bushings that go in the ears of the diff housing... And I specify new, because brand new OE stuff is way better than 20 yr old cracked, oil soaked rubber by far.

 

I've got the whole MMR drive line set, so far I've only installed the Trans bushings w/ a new crossmember...not really a noticable increase in vibration but it has made shifting easier

 

I have MMR UHMW rear diff bushings and rear subframe bushings. I also have a welded front diff mount. There is a little bit of gear whine and gear clash transmitted into the cabin, but the rear end is extremely solid.

If you run a silid front diff mount, you MUST get solid subframe mounts as well or you will rip the diff mount tab off the subframe.

 

but you can run the MMR rear diff mounts w/ a stock/mazdaspeed front diff mount w/o problems correct?

 

Absolutely.