All GREAT advice here (in my opinion). If you decide to use the 59 CC trans, you not only have the problem with rear engine mounts but you'll also have to figure out transmission linkage and how to do the external cooling for the 59 trans. Too many problems for what some would consider an inferior transmission to the 55 dual range.
Pontiac switched to the CC trans in 56 but GMC continued to use the dual-range up through 59 (and later I think), probably because the dual-range was stronger and more efficient. Rolls-Royce used the dual-range well into the '60's.
Stick with the 55 trans, grind that crank a little and bolt in the 59 engine for a serious performance upgrade. You can even bolt up the 55 exhaust manifolds to the 59 engine, but you'll get some restriction in exhaust flow due to smaller ports in the 55 manifolds.
Go for it!
__________________
Larry Gorden
POCI 1956 Tech Adviser
www.PontiacSafari.com
|