So, say a ATI 30 roller sprag vs. our stock 10 or 12 (whatever it is) and a billet drum (from pick a company) would make for some decent insurance if someone is looking at running a decent amount of HP through a SB trans?Torque Flights go boom when the drum free wheels somewhere past 9000 RPM. It's possible to hit this because when the conditions are met it's going 2x engine RPM. The fix for it is to replace the factory drum with a billet steel one.
Improper burnouts (not starting in 2nd gear) and a damaged rear axle can cause the sprag to fail; which will cause the drum to free spin.
Am I getting this right guys?
My 518 still has the factory powdered metal drum in it. When it comes out for a refresh it'll get a bolt-in sprag and steel drum.
Would that be correct?
This is what is included with the 904 BIY kit from, Cope:
BUSHING KIT
WASHER KIT
BLOCKER ROD
BILLET 4.2 LEVER
HD BAND STRUT
PERFORMANCE FRONT BAND
PERFORMANCE REAR BAND
LOW REVERSE BILLET SERVO
MULTI SPPRING PACK
DEEP STEEL OIL PAN WITH FILTER EXTENSION
OIL PAN STUD KIT
RACE REBUILD KIT INCLUDES: PERFORMANCE CLUTCHES, STEELS, FILTER, TEFLON RINGS, SEALS & GASKETS.
From there it goes over using a forward or reverse manual valve body depending on HP of the build.
Now, looking at the billet aluminum vs steel drum is where a big price jump happens.
$600+ for the billet aluminum drum alone.