i was reading this other post my truck is doing the same thing ...reving real high before it shifts gears
JA: How old is the transmission? Have you noticed any leaking?
Customer: no ..no leaks... it's an 89 z71 4x4
JA: What is the model/year of your Chevy?
Customer: 89 chevy 4x4.... z71
JA: What year is your chevy?
JA: Are you hoping to fix this yourself? What have you tried so far?
Customer: haven't tried nothing yet ...was gonna try and work on it this weekend
JA: Anything else you think the mechanic should know?
Customer: i rebuilt the engine
a few years ago......... it runs well........ this shifting problem just started........ it's worse when the truck is cold .
JA: OK. Got it. I'm sending you to a secure page on JustAnswer so you can place the $5 fully-refundable deposit now. While you're filling out that form, I'll tell the Chevy Mechanic about your situation and then connect you two.