New rebuilt C4 hits neutral before hiting 3rd gear? Help please!!

[5-oh stang]

I have only driven the car about 4-5 miles but anyway, it is a 68 C4 and we put a Hughes Performance Transmission Kit in it and eveything is new, i also has a B&M Shift Kit. It will shift 1-2 fine, couldn't be better but when it shifts from 2-3 it's like it hits nuetral for a second or two then drops in 3rd gear? It does it either on the gas or off the gas. Anyone have any clues as to what it could be the cause of this?
Thanks alot!

 

[Max Power]

Either a sticking servo or a band out of adjustment, IMO. There is an adjustment procedure in the service manual.

Mine does it too, but it is old and I think the band is just worn out.

 

[mustang70]

I had this same problem with my old C4. Even after it was rebuilt with good parts and a shift kit. Be careful, after we put it in my buddies 66 the tranny ended up grenading. The only thing that was usable afterwards was the case and valve body.

 

[bull999999]

Either a sticking servo or a band out of adjustment, IMO. There is an adjustment procedure in the service manual.

Mine does it too, but it is old and I think the band is just worn out.

Yeah, aren't you supposed to adjust the band after installing the shift kit? I installed a B&M Shift Kit in a C6 before and it did say to readjust the band after the install. Don't know about the C4, though.

 

[Damein17]

mine did the same thing in my 67 c4. i rebuilt the trany and adjusted the bands and it shift perfect now

 

[Max Power]

Yup, re0adjust after a shift kit. It's good to periodically adjust it anyway.

 

[66candy]

Try to adjust the vacuum modulator and see if there is any difference....
Did you check if the vacuum modulator is connected to the hose/line?

Good luck,

Erwin, The Netherlands