M40 adjustments

[WILMASBOYL78]

I don't htink the governor will have a big impact on normal driving upshifts....adjusting the modulator or modifying internal pressure with a shift kit will work better. The governor has more of an impact on WOT shift points and down shift for passing gear.

Tim, I would try using an adjustable modualtor(aftermarket) and not mess with the factory unit. The more you restrict the vacuum....the firmer the shift and it will hold a little longer.

CW tranny and 4.10 gears are a trip...we have that setup in our 70 L78 car and it really works ...and, with the stock modulator.

[TimG]

It sure does, if I hit it just right, I can leave long black marks in second gear.

[RPOLS3]

Wilma you are correct.

The governor revisions affected the shift points (up or down). I was able to dial in WOT shift points that were substantially higher than stock since I was starting with a pretty lo-perf trans. The shift improver kit is what really firmed up the shift itself as I chose not to adjust the modulator at all. Both things were pretty low buck modifications I could do myself that I felt really worked well for my application. My goal was to duplicate as close as I could the performance of an LS6 M40.