Question about 1992 GMC G2500
I have a GMC 1500 standard and when i turn it on it wont shift how do i fix it.
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Posted on Jan 02, 2017
Maybe, but won't know till you take it too tranny shop. Even iif it is done a rebuilt is still cheaper than brand new. And, less you drive it now less damage done.
Posted on Dec 29, 2008
SOURCE: 1993 GMC 1500 4x4 poor shifting
this may be due to a poor connection at the vehicle speed sensor on the transmission, pull the connector off the sensor and clean it with contact cleaner, if the problem persists replace the speed sensor. there are 2 diff ones here is a picture of the most common one for an auto trans.
Posted on Mar 26, 2009
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.
Posted on Aug 26, 2009
Climb under your pickup and look where the cable connects to the side of the transmission and make sure there is not any mud around the cable or around the shift linkage hookup. If so clean it off and see if it will shift. We have found many of these with mud caked around the shift linkage or a lot of ice buildup and wont allow it to shift into park.
Posted on Dec 11, 2009
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.
Posted on Jan 27, 2010
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