"If you use an adjustable prop valve, you should not be using a combo or another prop valve anywhere."
I used one autocrossing my 78 TA when it was disc/drum. An old C2 Vette one then replaced with a Mopar direct connection one when it started leaking. Then when went 81 TA 4WD set up just T'd the fronts and adjustable prop valve in the rear
Did the same with the '79 Camaro when it was a disc/drum C/P autocross car. Now a manual 4WD drag car T's from the Line Lok and an adjustable prop valve in rear. The 81 TA now also has just a T and and adjustanle as I think the factory 4WD prop valve was not working correctly.
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