TH400 Sprag vs Roller Clutch?!
 

I started taking apart a TH400 recently to replace the valve body and roller clutch/sprag assembly. Didn't actually know if the trans was a roller or sprag drum until I got it apart cause the tag was painted over.

Anyway, I have a roller clutch/drum setup and want to convert to a sprag/drum setup; is Part #K7SD from http://400raptor.com/#Performance%20Parts the correct thing?

Description from site:
34 element intermediate sprag and drum kit
The TH400 34 element PATC sprag replaces the stock 16 element unit, increasing the torque capacity by 110%.


Or how about this one?
http://transmissiontechnologies.com/...ent-sprag.aspx



or am I wasting my time and the roller clutch/drum setup is fine behind a 500ish crank horse motor with an extra 150 shot , 3,500ish stall and a trans brake?

Can't help you with that question but this is where I've gotten automatic parts from in the past and they were pretty good:

http://www.bulkpart.com/Merchant2/me..._Code=3L80-400

Awesome. That works out great. They have the sprag style drum used in good conidition for under $100.