a140L will not upshift

[extranwp]

added qt of lucas trans treatment and a week later it will not upshift out of first gear, any thoughts have not had any problems till then.

[amerikim]

ouch. Try getting a flush. I am not sure if it will help anymore but its worth that try.

[autonotives]

Sounds like you overfilled your tranny. Yep ouch..bye bye to your tranny...Overfillling above the full line causes excessive pressure buildup and of course damage the transmission.

Try this, get a thin hose and the gun from a squirt bottle. Insert it in and siphon excess fluid out.

Originally Posted by extranwp

added qt of lucas trans treatment and a week later it will not upshift out of first gear, any thoughts have not had any problems till then.

[csaxon]

Why did you add a qt of lucas trans treatment? What was your trans doing? Any error codes?