727 Rebuild Advice

72ScampTramp said

I have read that before. I dont plan to run a manual VB. I also doubt Ill ever see over 6k. I wont go bolt in sprag I dont feel its needed. I did know about the burn out in 2nd gear. Im sure that thats not exactly what you ment but if this was a full out race car sure I would probably use a bolt in sprag.

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5000 rpm in first gear with the sprag rolled over will spin the drum over 12000 rpm , can you say KABOOM !

Unless you have a full manual valve body starting out in second gear with an automatic shift valve body, even with a shift kit in it, still starts the trans in first WITHOUT the low band applied. With an auto shift valve body the only time the low band is applied is when the trans is in manual low .

I just did a trans to put behind a mild 440 , put the A+A sprag in it for piece of mind because the owner didn't want to spend 600 for the front drum. the extra rollers in the super sprags make it virtually impossible for the rollers to fail , there isn't enough room for them to move that far.

Of course if you do something dumb like don't shift to first a 60 you can rip the back part of case out....