4L80E & TH400 Tech.

[demian5]

Originally Posted by clinebarger

The only thing needed is a parking pawl cup plug, Comes in every 4L80E/TH400/TH350/700R4/4L60E rebuild kit.

Use the Cup Plug to block the Reverse passage in the case. (the passage to the right of the Center Support Bolt) I recommend using some type of Retainer Compound on the OD of the cup plug & let it set overnight.

Is this a good thing to do if you have to pull the valve body for any reason?

I have to pull my VB to replace the plastic piston on the VB.

Any other suggestions while I am in there?

Its an 86 C20 with 57k OG miles. Never been apart. Shifts great, just no engine braking in 2nd only.