Eroc87

I got a t350 in a 84 cutlass supreme. My problem is that it only shifts from 1st to 2nd gear only and hard. When it does shift its @ about 25 mph. What can be the problem?

72 cutlass455

Is there a vacuum line from the manifold to the transmission vacuum modulator check this out it is like a booster for the tranny when mine was not on my th400 it ran 3500 rpm in first.

joe_padavano

It would help to know that type of trans it is (TH350, TH200, 200-4R). As noted, if it's a TH350 with vacuum modulator, either the modulator is bad or the vac hose has come off. If it's a trans with a throttle valve cable, the cable is probably not adjusted properly.

Eroc87

Thanks guys but i couldnt find the vaccum modulator. i did find the throttle valve cable, how do i adjust it properly?