Not Ranked
The 3550 should be more tranny than your motor can throw at it. IMHO the TKO is not needed unless you are doing one of the following: using a strong Big Block, running a power adder like turbos, Supercharger or N2O, planning on a lot of drag strip duty using slicks. The TKO costs more and needs a special clutch setup. I have heard the TKO is a little harder to shift than a 3550.
I upgraded to a 3550 from a SD T-5 that did not like my mild 5.0. I called Forte's and they said for under 450 HP the 3550 is plenty.
If you go with either transmission get the McLeod bellhousing, the proper GM syncromesh and a pro 5.0 shifter. Both Tremec transmissions come with a shifter that most people say is junk.
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