not that it pertains, but i have a spec stage 5 clutch in my 69, and it needed a .110 shim to give correct throw etc. that said i have the mcloed master, stock gm internal tb, and mine line is very close tot he header as well but i have it double wrapped in heat sleeve.
does it upshift fine in all conditions?
i would agree if it up shifts good(and has same tb throw everytime), it should down shift, unless there is an internal tranny issue(syncro etc)
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