I use a poly trans mount. Same one has been on the car for 23 years now. I've always been told not to run a solid trans mount so you have some amount of "give", but can't argue w/ blucuda's success. up Every time I've seen someone locally try that, they ended up cracking the trans case.

CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 18 spline 4 speed, Dana 60
'71 Demon, 340, low gear 904, 8.75
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax