Owner of this truck runs is own business and his truck is a big part of the business making money.

The owner complaint about the truck was that it had a engine noise and the transmission was not shifting properly.

I am no engine guy, so my body handle rebuilding the engine and I tackle the transmission issue.

The 4l80e our some really durable units and they are rare to seen on my bench. But like everything else it has a end date.

Symptom;

Slipping

Problem;

clutch and frictions were worn

Solution;

rebuild kit, all new frictions, seals, and upgraded the pistons to molded rubber,