C4 Transmission Problems!!! Please Help
 

I have a 66 coup and I am having trans problems. It seems to shift fine into the first gear when I step on the gas but it revs really high before dropping into the next gear. If I take my foot off the gas and reapply it sometimes drops into the next gear. The fluid levels are fine.

Re: C4 Transmission Problems!!! Please Help
 

A couple ideas...

Vacuum line?
Kickdown linkage?

Re: C4 Transmission Problems!!! Please Help
 

Check your modulator valve at the right/rear corner of the tranny. A vacum line runs to it.

The line could be broke/rotten or the valve could be bad itself. Alot of times fluid will suck up into the the intake from the valve when its bad.

If you take it off, dont lose the little metal rod, inch or so inside when you unbolt it.

The nipple that the vacum hose plugs onto also is a screw. You can turn it 1/4 turn to adjust shift points.

Re: C4 Transmission Problems!!! Please Help
 

which direction would you turn it to have longer shift times to act like OD for third gear so when you are on the highway between 60-80mph the engine not racing.