Question about 1991 GMC Sierra
i have heard that the ignition switch can be faulty and not let the full voltage thru to the electricaly controlled 4l60e trans.i have the same problem with my 95 1/2 t. i rigged a switched wire from the fuse block via a relay to the proper wire on the trans....ask a trany tech and they will know what im talking about,,,good luck
Posted on Oct 30, 2008
SOURCE: transmision shifting problem
Reverse is not sycronized, this means the gears have to stop to mess and not grind, two thing cause this, being to quick to slam into reverse after clutch is depressed, a problem with the clutch.
Posted on Oct 31, 2008
4th gear failure is a common problem with this transmission, assuming it is an automatic. You should have the vehicle checked for codes by a qualified repair center with the proper scan tool. Also, check fluid level and condition. More often than not, the trans loses 3rd and 4th gear, as these are working off the same set of clutches. 3-4 clutches apply in 3rd, and when the 4th shift is made the 2-4 band applies giving you overdrive. If you have no engine braking in manual 3rd, you definitely have a mechanical failure, no 4th could be an electrical, or mechanical fault.
Posted on Nov 18, 2009
The gear shift lever indicators tell you what gear you have an automatic transmission
in on your vehicle. The shift solenoid tells the transmission when to
shift gears and what gear to shift into. Newer model automatic
transmissions have electronic shift solenoids that are activated and
change gears based on the speed the vehicle is traveling.
Troubleshooting either one of these transmission components is
relatively easy if you know a little about automobile mechanics. With
the right tools, you can determine whether the transmission shift
solenoid is having a problem. Gear shift indicator problems can be
determined simply by moving the gears into their designated position.
Transmission Shift Solenoid
Gear Shift Indicator
Posted on Feb 02, 2012
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