donsrods
Well-known member
My Son has a th350 behind the 455 Olds in his rpu and I am not sure we have the vacuum line for the modulator hooked up to the right source. The transmission shop told us that there should be suction at idle but it should drop off as you accelerate, and I think we have just the opposite.
The problem is that the intake manifold on the motor is a W30 Tripower intake that was used only on 4 speed 1966 442 Oldsmobiles so there is no port on the intake where you can hook up the modulator. So we took a plug out of the rear 2 barrel carb at the base and put a threaded barb in there and hooked the modulator to that. But I think that spot has more vacuum suction as the rpms increase.
The transmission works great and shifts ok, but it is pretty soft between gears, and it is a built Jackson Racing unit and the local shop said it should be brutal on the upshifts. We are also running a 3000 stall convertor which should help even more.
So my question is, should the vacuum suction for the modulator get less as you speed up, and does the spot we picked do that or not?
Thanks for any help.
Don
The problem is that the intake manifold on the motor is a W30 Tripower intake that was used only on 4 speed 1966 442 Oldsmobiles so there is no port on the intake where you can hook up the modulator. So we took a plug out of the rear 2 barrel carb at the base and put a threaded barb in there and hooked the modulator to that. But I think that spot has more vacuum suction as the rpms increase.
The transmission works great and shifts ok, but it is pretty soft between gears, and it is a built Jackson Racing unit and the local shop said it should be brutal on the upshifts. We are also running a 3000 stall convertor which should help even more.
So my question is, should the vacuum suction for the modulator get less as you speed up, and does the spot we picked do that or not?
Thanks for any help.
Don