bill
turboglide was offered with the 348 only as was the 4 speed

348-250hp fits Q & R/sa... jump on in i cant wait to see then cc the head (piston & block )
however all cars were offered with a three speed overdrive trans
this trans is self contained inside the transmission case and provide the operator SIX DIFFERENT GEAR RATIOS TO LET THE CLUTCH OUT AND MOVE FORWARD.
therefore according to the RULEBOOK all 55-61 chevys SHOULD be allowed to use a six speed manual transmission... however that is not the interpretation of the technical department ????
jack mccarthy... t/s with a six speed