727 or 904?

1. the old parasite drag is real...swapped out 727 with TA converter for a 904 with Ta converter...car picked up .15 and 2 mph....some say no big deal...as the car becomes faster...a tenth and half can cost alot of money.....i know big deal you are bracket racing just put a dial in on it and run it.....well..true...but i keep trying new stuff to go faster.
2. As Rob said aka Crackedback....I use stock disc and steel...put 5 of the thin disc and steel in front drum....use the 24 spring kit in front drum..cost about 120 bucks...ATI had the reverse wound big spring for 20 bucks...I have one in 904 but the trans has not made it way into the car it was build for.
3. I replace the servos with billet units from Sonnax ...not very expensive....there is some other billet servos for around 86 bucks.....MOPAR 904 500 42RH 42RE TRANSMISSION BILLET REAR SERVO KIT, DODGE, PLYMOUTH AMC | eBay

For band i use Kelvar lined bands ...some people dont like them....I have never had any problems with them.....they usually sell for around 30 bucks each.........replace drum bushing...pump bushing ...tailshaft bushing....
We have 3 904 in use...they all use Tranzact of Indy transbrake ...I have a complete spare with brake installed...also got another 904 with old TA manual valve body ready for another project this winter....Have used low gear sets and regular gear sets.....only problem i have had is one burned up the clutches in the rear drum a couple of years ago...I have a few problems that were my fault....like rolled lip seal....lol

dont waste you money on bolt in sprag...cause the stock sprag is bolted in....or rivet in....

They are very easy to rebuild as J par says....hell if he can do it...a cave man can do it....