Transmission won't shift to third gear
SOURCE: 2001 Yukon XL SLT 4 speed Auto Transmission shift problem!
Sam,
I would start with a transmission fliud and filter service.
I would then have the trasnmission checked out by a transmission shop. The transmission most of the time has the direct drum band is starting to go. The shops can rebuild it no problem, This is a very common failure wiith the trasnmission.
Good Luck
Testimonial: "Thanks alot richtko94'! I'll try that!"
SOURCE: transmission wont shift into any forward gears or
4WD! the transfer case is not stuck in neutral is it? Fluid levels are good? Have you noticed a decrease in mileage or power prior to this problem? If no then time to take it in for service it sounds like. Transmission fluid is not consummed, so if it leaked out then you may be able to fill it up and get the leak fixed, if too late then its a rebuild on the tranny.
SOURCE: i put in a used transmission into my 2000 gmc
No movement in any gear: pump failure, or total loss of fluid. R&R, or refill pan and find the leak. If out of fluid, avoid running the engine until the trans is refilled to avoid pump damage. To check for pump failure, check fluid level with the engine off, then start the engine and recheck fluid level. If level does not go down when engine is running, the pump is broken.
Secondly, put a line pressure gauge (or visit a local trans shop) on the pressure test port and go for a drive to verify proper line pressure. Base pressure at idle in P,N,OD should be around 70psi and around 140psi in R. Max line pressure should be at least 190psi at WOT in 1st or 2nd, 225psi is optimum. If base pressure is low, trans or pump is worn out. If max pressure is low, check EPC solenoid. If reverse is slow to engage, and line pressure does not come up to at least 130psi in reverse, replace the boost valve with a Transgo 0.500" boost valve (easy fix in pan).
Also note that many problems that show up as transmission issues are actually PCM or electrical, and may be external to the transmission. Try a different PCM, and check for chafing where the cables come out of the PCM. Before guessing at transmission problems, check the fluid level (car warmed up, engine running in Park on level ground) and have the PCM scanned for trouble codes FIRST.
Good luck and keep me posted.
SOURCE: 95 yukon won't shift into first gear.
I don't think its plug wires. When you say it won't shift into 1st? It takes off in 2nd? Does it shift to 3rd and 4th? Or is it a shifter problem? Like it won't go into manual 1st
SOURCE: 1992 GMC Sierra 4x4 Auto
Check to see if the cable for the transmission is still hooked to the throttle body. If yes it sounds like the governor is bad. It is under a round steel cover on the drivers side of the transmission
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