700R4 Failure

[clinebarger]

Originally Posted by Greenlee

My TV cable pulls all the way out when the throttle is fully pressed. There is no slack in the TV cable at full throttle. I also checked to make sure the throttle is all the way open when the gas peddle is to the floor. Is there any thing I'm missing with respect to the TV cable?

When I first got the truck running I had two computers and accidently used the wrong one. I had a computer from a 3/4 ton Suburban with a TH400. I drove it to work once like this about 30 miles each way. I probable drove it no more than 100 miles like this. Could that have burned up the transmission?

I am just curious if I did something to cause this or it was a crappy rebuild.
Posted via Mobile Device

The TV can still be off....Especially if the TV spring itself is too short for your application, This is the reason you should always install a pressure gauge BEFORE its ever driven.

Watch for Instant pressure rise when pulling the TV cable, Ideally you want a 1-2 psi preload on the cable above baseline (TV unhooked)......Ask the builder to omit the TV exhaust check ball so baseline pressure is easy to obtain.

As Jfortvalley mentioned....The Input drum HAS to be air checked for leakage around the input shaft, Test the 3-4, Forward & Overrun, Not just the 3-4's.

The aluminum 3-4 piston can crack, Though it is rare. I use the Bonded steel 4L60E 3-4 & Forward pistons on just about every build.

Just for sake of explaining....The back side of the 2nd servo is used as the 3rd clutch accumulator Thus the reason for checking the servo area.
Replace the 3rd clutch accumulator capsulated check ball 100%!
Replace the Input drum capsulated check ball as well, Or install an orifice in its place (Transgo)