727 issue

[BlooDSMeaR]

Had the same problem. With the car on jack stands I could see the tires stop completely on the 2-3 shift. Adjusting the rear band helped tremendously.

When I did adjust the front band, I first tightened the adjuster to 72 inch pounds, then backed off 2 full turns. It was still stopping the wheels on the 2-3 shift. So I loosened it in 1/4 turn increments out. Even with getting the front band adjusted enough so it wouldn't stop the rear wheels on the 2-3 change, the trans would cut loose on the slightest blip of the gas peddle.
TCI is Being very helpful with helping even though the warranty period is up long ago.

 

[Garys1969RR]

By cut loose, do you mean it shifts into passing gear? If so, it may be your kickdown linkage adjustment at the carb. That makes it downshift to a lower gear when you open the throttle.

 

[BlooDSMeaR]

By cut loose, do you mean it shifts into passing gear? If so, it may be your kickdown linkage adjustment at the carb. That makes it downshift to a lower gear when you open the throttle.

Its a full manual reverse shift VB. There are no kick downs to adjust.
When I say the trans cuts loose, I mean that the engine RPM climbs but the speed does not. The trans is slipping.
Its all good TCI is taking care of it.

 

[Garys1969RR]

Sounds like the high clutch is slipping. Weakest link on that transmission. Glad they're fixing it

 

[dvw]

If the Front band is loosened too far 2nd gear will slip. The travel of the servo applying the band is fixed. By loosening the aduster the anchor point of the band is moving away from the drum. Eventually it'll be so far that the band can't compress around the drum to stop it's rotation. It won't overlap because 2nd gear never applys.
Doug

 

[moper]

Adjusting the band tighter (fewer turns) will make things worse if there's overlap. The band is slower to release than the clutch is in coming on. I'll add - testing on jack stands may indicate a problem when the inertia of a moving car will make it fine. You need to test drive the car. Then see what it does.

 

[Garys1969RR]

If the Front band is loosened too far 2nd gear will slip. The travel of the servo applying the band is fixed. By loosening the aduster the anchor point of the band is moving away from the drum. Eventually it'll be so far that the band can't compress around the drum to stop it's rotation. It won't overlap because 2nd gear never applys.
Doug

Yes that's true. There is a split second on the 2/3 upshift when the front band is releasing, and the high clutch is applying. So you can fine tune the shift overlap with the front band adjustment. I have set it by backing off a little less than the 2 turns, to get a later release time. Maybe 1 1/2 turns out at the least. I like to experiment, and found that the number of turns out, affects how it shifts.

 

[66Satellite47]

To understand what is happening, you may want to study the diagrams of which components are changing during the shifts. Which are applying & which are releasing. A reverse manual valve body does not work the same as an "automatic" valve body. Throttle pressure is essentially fixed, no "kickdown" effect. Sounds like more of a shift cable adjustment issue.

 

[BlooDSMeaR]

To understand what is happening, you may want to study the diagrams of which components are changing during the shifts. Which are applying & which are releasing. A reverse manual valve body does not work the same as an "automatic" valve body. Throttle pressure is essentially fixed, no "kickdown" effect. Sounds like more of a shift cable adjustment issue.

I spent hours under the car adjusting the shifter cable, with all the fine tuning under there, the cable is dead on on every shift point. Every single detent hits spot on. There is zero possibility that that is the problem.

 

[66Satellite47]

OK, then you've got a valve body and or clutch clearance issue. Different valve body designs use different front band adjustment figures. The front band lever ratio & clutch pack clearance must match the valve body design. What you describe sounds like the clutch locking up before the band has released. Again several variables involved. Glad to hear TCI is working with you.