I have a built C4 transmission (closer to an FMX now) that recently started slipping from 1st to 2nd, not shifting out of the passing gear and just acting strange all together. After further investigation I found that the band adjustment bolt had worked its way loose (about two inches between trans and locking nut). I snugged it down then backed it off 1 1/2 turns and tightened the locking nut, it now seems back to perfect. My questions are if this has happened to anyone else and how crucial is it to have the perfect tightness? I feel pretty confident I did it right but didn't know if it would be worth it to have a shop double check it? Thanks in advance for any help.

 

adjust it yourself.
you are far more likely to do it correct than many shops.
follow ford shop manual specs.
sounds like you did it about right.

 

where is the band adjustment bolt? is it internal or external? my c4 is doing the same thing, slipping from first to second

 

can adjust both bands by simply getting under car and following adjustment specs. quick and easy.

 

66 tang-the band adj bolt for 1-2 gear is external. It's on the drivers side toward the front of the xmission, square head bolt with a locking nut on it.

001mustang-Thanks for the vote of confidence, I guess I'm just worried it's too tight, I've read that if it is it can smoke the trans pretty quick. I'll just keep an eye on the fluid.

 

ok, so should i just make small adjustments and drive it till it gets better?

 

how does a C4 get closer to an FMX are they both under the car holding hands?

 

The book says to tighten to 10 ft/lbs and back off 1 1/2 turns, then tighten the locking nut.

And yes, the transmissions recently went away for a weekend to Vermont.