81 K30 T400 only shifts via the Gov.

[farmall]

I was cruising along slowly when it would no longer shift without winding her out. Put a new Vac Mod and new rubber hose ends on, tested for Vac at the Mod and pulled the valve out. All looks good and within spec. Any ideas?

[Chevy_mud_truck]

I had one doing close to the same thing it was the switch on the pedal that works the passing gear going bad

[special-K]

Good to know. My son's CUCV is doing the same thing after a rebuild and we replaced the module.

[farmall]

I pulled and inspected the Gov and the valve moves freely, disconnected the kick down wire, test drove with the same result. Next I am going to swap Mod valves with another transmission.

[farmall]

I backed the adjustable modulator all the way out with no results.

I placed a piece of cellophane on the bottom of the PCV valve and reinstalled it with no results. The only vac lines are PCV, distributer, and the vac mod.

I tested the integrity of the metal/rubber vac line from the manifold including the modulator and it holds 20lbs fine.

Next when the rig cools down I am going swap the modulator valve with one from a spare TH400.

[farmall]

Swapped the valve, no change.

Looks like I get to drop the pan. Hopefully something will fall out and hit me in the head so I can get this fixed.

[farmall]

Dropped the pan and the detent/kickdown solenoid was hanging by its wire. The welds that attach the 4 feet to the bolt up plate failed. I have one ordered and I hope this fixes it.

[farmall]

It shifts now