Harts56

I have a 70 Challenger with a 440 and a automatic, 727 with a 2400 stall converter and shift kit to a 3.23 posi rear end. Have more than enough power to smoke em and break them loose when I nail it, but when shifting at WOT (5500 to 5800 rpm) I barely get a chirp. With my Camaro it was a much harder shift and a real chirp with a 2200 stall.

The trans shop is telling me that Chrysler transmissions back then have a set pressure in the valve body and can not be adjusted or changed like a Chevy. Is this true or is he just trying to get out of going in and making adjustments? I know engines and most mechanical except transmissions.

Any help out there?

Thanks

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