Well i have recently installed the new pro torque 10" converter which is rated around 3400-3500... the tranny has also been rebuilt and shifts very well... the converter seems to be very tight!! the problem is that even with the car in second gear going about 15 mph the car will not downshift into first for nothing!! even at 50 i will be in third gear and the car will not shift into second!! there is no downshift.. it just flashes to around 3500-3700 and goes.... the pro torque 2900 would downshift all day long but this new one wont!! i now have ls1 edit... what can i do to fix this!!

 

First, I would double check your fluid level. Second, I would run atap and make sure that your computer is seeing the correct TPS. Also double check that your LTRIMs are not whacked. If you have a ported MAF remove it and retest.

After that, you can change your downshifts in Edit in the Trans Section, A4 shift speed tab.

 

where do i check in ls1 edit to see what my tranny pressure is set at?? can too much pressure cause the converter to not downshift?

 

Tranny pressure: A4 Shift Firmness Tab, Positive Pressure versus Temp table. The table is not intuitive.

Did you change anything else when you did the converter swap?

 

When i did the converter swap all that was new was the converter.. tranny was cleaned up from the last converter blowing up... but that was it.. i know have heads/cam and about to ls6 intake.... what do you think it is??

 

Did you do the ATAP runs and recheck your fluid? Did you change the filter before installing the new converter?