727 transmissions are so complex

CudaFactHackJob said

Those kevlar front bands are cheap insurance at only about $20 free shipping.

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Here is an ebay kit to build on.

TF8 (A727 36RH, 37RH) Chrysler Red Eagle Kolene Transmission Trans Rebuild Kit | eBay

I use the red front band and the kevlar solid rear, reinforced stuts and billet servos. An I always install a bolt in rear sprag.
For a shift kit I like the B&M trans pak if not replacing the vb.