The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - th400 won't 2-3 upshift at WOT

*YoungPup1977* · 06-14-2018, 10:46 AM

I second BigDav's post, Your detent solenoid switch is stuck open or bad...this would cause your issue you are describing as no upshifting / WOT...

Held on with two bolts thru the VB separator plate into case, replace with new gasket.

06-14-2018, 10:46 AM	#3
YoungPup1977 Account Suspended Join Date: Jun 2015 Location: No longer here Posts: 1,000	Re: th400 won't 2-3 upshift at WOT I second BigDav's post, Your detent solenoid switch is stuck open or bad...this would cause your issue you are describing as no upshifting / WOT... Held on with two bolts thru the VB separator plate into case, replace with new gasket.