c4 trans question

If the trans vaccuum line is not on the right place on the motor, could it cause the trans to slip when shifting into 2nd gear? I am running an offy tunnel ram, an the tunnel ram has no vaccuum for the trans so the trans vaccuum line is ran to holley 600 carb. Note- i have already adjusted the bands.

 

No vacuum will not cause a slip. It will cause harsh delayed shifts only

 

Thank you

 

Adj. your band. Easy to do.

 

A lot of C4's used to slip because of a glazed drum the band applied to going into 2nd.

 

I adjusted bands a few wks ago. So if its a glazed drum then does that mean it needs rebuilt? The trans does not slip all the time... it started slipping a few wks ago, then i adjusted the bands and cruised it 4 or 5 times, then yesterday it started slipping again so i started back home and when i got a block away it was fine so i took it around the block again and nothing.

 

I had a vacume line come off my 77 ford tld wagon. It is not a c4. But it did slip and wouldent shift at all. You might want to look into that first.

 

Only way to know is to pull the valve body & take a look at the clutch drum. They will usually have hot spots in them like overheated brake drums would get. If that's the case then an overhaul is the best solution. Just pulling the trans pan will show you a lot. If the pans full of clutch/band material that will give you your answer. Old guy I worked with back in the 60's would take those clutch drums, resurface them on the brake lathe & reuse them. Always seemed to work & it saved people a lot of $$.

One thing I just remembered. Does the vacuum modulator screw into the back of the trans or is there a bracket that holds it in? The ones with the bracket would somehow get loose & let the modulator move back & forth causing all kinds of shift problems.

 

I think it screws in but i will have to double check.

 

Thanks guys for all your input

 

It could be overrunning the sprag if it does not shift into second making it feel like it is slipping.