I have a 66 c4 behind a 289 in a 66 Galaxie and the guy burned the transmission before putting in storage last winter. he thought something froze up. I rebuilt the transmission and sure enough, he wiped the teeth right off the clutches. nothing else in the transmission appeared to be wrong. when testing it was doing the same thing he said it did before rebuilding.It drove in reverse fine but forward was locking up and the wheels were chattering as we had it on jack stands. I thought there must be something in the rear end causing it so we pulled that apart. There was one axle bearing pretty gone.

Could the bearing have been acting like a one way sprag? Spiders locking? center section feels fine. has anybody heard of such a case? I don't want to ruin a newly built transmission. again, reverse works fine, forwards the rear end and things were bucking and the tires would barely rotate forward.

Need help?

Thanks.

55 Vicky & customline

58 Rack Dump, 55 F350 yard truck, 57 F100

59 & 61 P 400's, 58 F100 custom cab, 69 F100, 79 F150, 82 F600 ramp truck, 90 mustang conv 7 up, 94 Mustang, Should I continue?

Billy

Several years ago a buddy that has a shop had the same problem with a customer car. If I remember right, there was a problem with the converter (broken sprag or something). Did you cannge It after the rebuild? I wish i could be positive but that is all i can remember.

Gary Ryan San Antonio.TX.

The converter is pumping fine for reverse and it turns the same direction, forward or reverse, its hard to beleive that that is the problem but who knows, I hate to have to remove the tranny again.

55 Vicky & customline

58 Rack Dump, 55 F350 yard truck, 57 F100

59 & 61 P 400's, 58 F100 custom cab, 69 F100, 79 F150, 82 F600 ramp truck, 90 mustang conv 7 up, 94 Mustang, Should I continue?

Ford C4. It seems like your transmission is in two gears at one time. Check the easy stuff first. Reset both bands to the proper torque 10-ft lbs and the low reverse back off 3 turns. Intermediate band 10-ft lbs and back off 1 3/4 turns. Also check the governer installed the right direction. After that it means the fwd clutch is siezed and you should try to get a replacement. Drum and all. Pete

After further investigation and testing, it is working in low and reverse. but drive is locking up. according to the manual it has to be the low reverse band or low reverse servo. Must be fluid leaking by the valve locking the band on, guess I have to tajke the valve body off.

55 Vicky & customline

58 Rack Dump, 55 F350 yard truck, 57 F100

59 & 61 P 400's, 58 F100 custom cab, 69 F100, 79 F150, 82 F600 ramp truck, 90 mustang conv 7 up, 94 Mustang, Should I continue?

Do an air check of the C4. A good video on Utube from Badshoe will show you how. Pete

Try a Google

Just a thought here. You mentioned "sprag" & "overhaul". Depending on how far you disassembled it, on reassembly if you put the sprag in backwards it wont move forward but will go in reverse. It may move forward in manual low gear but its been a few years. It should work like a one way clutch, it will spin in one direction and lock up in the other. If you put it in backwards it spins both ways. Dont ask how I know this.

Dan      Kingman Az.      86409

I don't beleive anything is in backwards, this was a perfect running transmission which he was driving until last fall when he went to put it up and it started doing this, he ended up wiping the teeth off the clutches by forcing it, now after the rebuild it is doing the same so a valve is leaking by, blocked passage, or not directing the fluid in the correct way,. I think the reverse/low band and servo are staying on when in drive, But why?

55 Vicky & customline

58 Rack Dump, 55 F350 yard truck, 57 F100

59 & 61 P 400's, 58 F100 custom cab, 69 F100, 79 F150, 82 F600 ramp truck, 90 mustang conv 7 up, 94 Mustang, Should I continue?

You mentioned that the teeth on the clutches were wiped out. Forward clutch, rev/high clutch or both? When you reassembled it were the splines on the clutch hubs where the clutches ride smooth (so the clutch discs can release smoothly and not get caught on a spline & keep turning). They just about have to be pristine to work correctly. Power flow in drive runs through the front clutch & sprag, in manual low it runs through the forward clutch & low/reverse band if I remember correctly.

Dan      Kingman Az.      86409

I installed a new cluth hub with pristine teeth.

55 Vicky & customline

58 Rack Dump, 55 F350 yard truck, 57 F100

59 & 61 P 400's, 58 F100 custom cab, 69 F100, 79 F150, 82 F600 ramp truck, 90 mustang conv 7 up, 94 Mustang, Should I continue?