I have 88 f250 5.0 4wd bw1356 t.c. aod trans. problem is when im driving if i let off gas and push pedal back down it makes clunking noise ( like bad u-joints) but u-joints are good. tightened rear pinion nut(was loose) helped little but still making noise. trans shop said chain in t.c. is stretched, but i dont think the chain is used in 2wd.? they said trans seemes to be fine. also all mounts are good. anybody know what this is? PLEASE HELP!!

 

The tc has shift forks in it. The one for high range is bad about wearing out after a lot of miles. I had on that would pop and make noise. It finally got to the point to where if i let off the gas it would pop and act like it was in neutral untill i accelerated again.

 

is that in 2wd also? is the t.c. used in 2wd? how much are forks? easy to replace?

 

Sounds like your TV is out of adjustment, readjust and see if that does not take care of it. The adjustment is on top of the throttle body.

 

what is TV?

 

how do i adjust it?

 

Throttle Valve.
It could also be what rbloodhound post said but a lot of the time with an AOD it is the TV adjustment.

 

how do i adjust it?

 

Two methods of TV system adjustment are available.

1. TV cable adjustment with engine off.

2. TV control pressure check and adjustment procedure with engine on.

The Throttle Valve (TV) Control Cable System consists of a cable attaching stud on the throttle body throttle lever, the TV Control Cable Assembly, the External TV Control Lever on the transmission, and the Cable Mounting Brackets at the throttle body and transmission. As the throttle body lever is moved from idle to wide open throttle (WOT), the TV control cable pulls the transmission TV control lever from idle to WOT. Return of the cable and transmission lever towards idle is accomplished by the return spring on the transmission end of the cable assembly. This spring and the end of the cable assembly is protected by a flexible rubber boot. The transmission external TV control lever actuates the internal TV control mechanism which regulates the TV control pressure. The travel of this lever is controlled by stops internal to the transmission.

The TV control cable is set and locked to its proper length during initial assembly by pushing in the locking tab at the throttle body end of the cable assembly. When the tab is unlocked, the cable is released for adjustment. The take-up spring at this end of the cable automatically tensions the cable when released. With the slack taken up and the locking tab pushed in, the take-up spring plays no part in the operation of the system.



Under normal circumstances, it should not be necessary to alter or readjust the initial setting of the TV control cable. Situations requiring readjustment of the TV control cable include maintenance involving the removal and/or replacement of the throttle body, transmission, or TV cable assembly.

When the TV control cable is properly set, the transmission TV control lever will be at its internal idle stop (lever to rear as far as it will travel) when the throttle body throttle lever is at its idle stop.

 

what would cause that to go bad and need adjustment?

 

if that doesnt fix it, u have another idea what it could be?

 

1. Somebody working around the Throttle body.
2. R&R Transmission or engine.
3. Worn parts.

It could also be a bad anti-clunk spring or what rbloodhound said.

 

what does anti clunk spring do and where is it?

 

It keeps the transmission from making a clunk noise when you let off the throttle.
It is inside the transmission.

 

it only makes clunk noise when i am driving down road and i let off gas and push pedal back down. makes noise when pushing pedal back down, not when i let off the gas.