TH350 ? for the serious mudder
My buddie Harold does some semi serious competition mud running with his Chevy pu. Anyway he spins 44" tires, operates his sb between 7500-8500 rpm (seasonal rebuild) and uses a semi beefed up TH350 (along with a strong D60 and a D44 that he routinely blows u-joints out of-read too cheap to spring for a front D60)
He uses a "manual" shift valve body ..i.e. NO automatic shifting. Hence he is either in LOW (not drive low - low LOCK) 2nd or 3rd. Constant engine braking in all gears. He recently had a sprag clutch failure and the SUPER DUTY sprag is around $1400 ...he's planning on getting a replacement "not as" super duty replacement sprag cluth for $900...
The sprag clutch, or it's cousin the roller clutch, is only used in LOW Drive (not LOW LOCK -engine braking) to allow the engine to idle while in first gear ..that is, the drive train can over run the engine --no engine braking. That is, it's as useful as udders on a bull for a manual shift trans.
So why would someone make a super duty sprag clutch for competition use when it would make much more sense (and far cheaper) to just eliminate it with a solid cast piece???
I don't quite remember my clutch/band applications in the TH350 ...I can't see it being necessary for reverse.