Been searching and calling around for built 4L60E's this morning.

Was told at 400+rwhp on 5,000+ lbs Tahoe I will need the billet output
shaft for my 4L60E. That puts it at a Lvl 5 FLT or Century transmission.

Both run $2,800+ ......... ouch.

Saw the 4L60E to 80E sticky ........ doesnt look too hard.

Have seen that stock 4L80E will easily handle 400-450rwhp.
Is this true ? $800 stock 4L80E sounds lot better if it really will hold up.