I own a 86, Z-28, 305 4 bbl engine with the 700R4 transmission. I bought it new, drive it daily, and don't push it hard at all. A while back the tranny started acting up. Sometimes OD would operate normally and somtimes it wouldn't go into OD at all.

I dropped the pan, pulled the valve body and servo, and cleaned and inspected everything, looked good. No metal or particles in the pan, fluid was clean and smelled sweet.

Before long, OD went away all together. The tranny works fine otherwise. No slippage or odd noises and the shift points seem fine.

However, I recently had to change the tranny mount and am wondering if something got out of adjustment when the tranny was moving around due to the busted mount.

Any suggestions?

Jim Landy

 

Start with the basics: To adjust the TV Cable skip the book method and do this: Press the D button on the adjuster and loosen the cable setting. Now, have someone floor the gas pedal while you check to see if the throttle plate is open all the way. Usually they are off a little and will wiggle. Do whatever you have to do to get it open solid. Now, with the pedal still floored, press the D button and pull the cable casing (the black tube) back as hard as you can and release the button. You now have the engine, tranny and gas pedal all in sync at WOT. Mark the cable so if for some reason it gets moved you can know where to put it again. The problem with the 'self adjust method' is that it bends things and puts them permanently out of whack. It is also the full TV setting, which is theoretically what the GM method does.