Join Date: Mar 2002
Location: Austin, TX, USA
Two things determine shift - modulator pressure and govenor pressure. Altering either one will change the shift points. The most likely adjustment is to change the govenor. This usually consists of changing springs or grinding some off the weights. Problem is, the govenor will alter street shifts also. I don't know if this is undesirable or not, but beware.
The modulator adjustments will require valve body modifications of some sort. By tweaking the modulator, it's possible to get it to shift at 2500 or so when light-footing it, but give you the 6000 shift your looking for a WOT.
68 Coupe, 350 w/ Edelbrock Performer RPM heads, cam, intake, 700R4, Dave's small body HEI