When I punch it from a 10-15 MPH light acceleration the transmission dis engages long enough for the engine to almost over rev before re-engaging into 1st gear.

This doesn't seem normal. any Ideas of why?

I have: 1969 coupe, 377 C.I.D, 3.31 gears, 700 R-4 with Corvette 2-4 servo, boost bushing, and presure regulator spring.


for a short time to down shift and the

How many miles does the transmission have on it? Could be a number of things anywhere from worn internals to sticky valves to assembly error after a rebuild. I presume we're talking about 1st gear. Were you in D before the downshift forcing a 3-1 or detent downshift?

If the transmission isn't aged, and you think this is just poor shift programming, consider a transgo shiftkit. If the fluid is burnt, or there are metal flakes in the pan, the kit will be an expensive waste of money unless you plan to rebuild it.

-dnult

That could be it. It is an aged transmission.

TTFN
Mat