Interesting no lockup problem with 2004R

[bored&stroked]

Hey guys. This 2004R is in a 79 c10 pickup. It came out of either a t-type or GN. It was built by bowtie overdrives in california, and has about 10,000miles on it and only about 3000miles on the torque convertor. The problem started on my way back from las vegas, a 6hr trip. 10min from home on the freeway my TC unlocked. I had the automatic lockup switch on, and I threw the manual lockup switch but it didn't help. Since then I've replaced the TCC solenoid and checked the valve thats under where the solenoid goes. Bowtie gave up and dosen't know whats wrong. The tranny will lockup for the first mile or two in the morning if I keep it in 3rd and below about 1800rpm. Anything above that, 4th gear, or once its been driven a little bit and lockup goes away.

Does anyone have any guesses of what else I can check before I have to acutally pay someone to fix this?

 

[BlackBeauty]

My problem was the brake switch needed to be adjusted. Hopefully yours is an easy fix (where everything doesn't have to be taken apart).

 

[bored&stroked]

Unfortunatley [only because thats not somthing I can check] the manual lockup switch overrides the brake switch and will keep the TC locked up if it worked correctly.

 

[2quiktocare]

Bored, every manaul lock up I have seen still has the brake over ride switch so when you go to brake the lock up releases. If it stayed locked you would be stalling the engine everytime you stopped.

 

[bored&stroked]

Originally posted by 2quiktocare
Bored, every manaul lock up I have seen still has the brake over ride switch so when you go to brake the lock up releases. If it stayed locked you would be stalling the engine everytime you stopped.

Yup. Almost done that a couple times. The auto switch is wired into the brake switch, but the manual is just a strait power source to the tranny. A couple times I've left it in 3rd, locked it up, come to a stop and almost died. The hard jerk when it downshifts into 2nd locked up usually reminds me in time

 

[77 cruiser]

but

When you slow enough so that it drops out of 2nd it should still unlock if the conv. valve in the pump isn't stuck.

Jim

 

[bored&stroked]

Re: but

Originally posted by 77 cruiser
When you slow enough so that it drops out of 2nd it should still unlock if the conv. valve in the pump isn't stuck.

Jim

I wouldn't know, I can't get lockup to work at all anymore
Thanks for the ideas guys, keep em coming if you have any more.