Question about 1994 GMC Sierra
Automatic or standard? If standard, clutch is worn out. If automatic, the regulator valve is worn out.
Posted on Oct 21, 2013
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Posted on Jan 02, 2017
rec check fluid first. If trans fluid hasn't been changed in last 30,000 miles change fluid, filter and pan gasket. At that time inspect for foreign materials in bottom of pan or on magnet if you have one. If truck has over 100K and fluid was never changed you may have more problems if changing the fluid.
Posted on Jun 17, 2010
If reverse is ok then you have a bad shift solenoid b.There are two solenoids on the back of the valve body that are identical,it will be the one on the pasenger side.GM calls them the 1-2 and 2-3 shift solenoid but this is deceptive because it takes a combination of them being on or off to achieve every gear.Pull the pan, disconnect solenoids and check resistance across them with a volt meter.I think you are looking for less than 20 ohms but the bad one will be off the chart.Bad transmission controllers are very rare in a GM vehicle.I bet if you have codes pulled you will find a shift solenoid code.Good luck!
Posted on Feb 21, 2011
THe 4l60 is an electronic produced shift trany, It sounds like the place to start, is to see if you can shift it manually. Starting out in first and work your way up as the vehile speed increases. I have a question for you. Did this problem occur all at once or over time? I would say most common reason is shift solinoid problem, But could be many other reasons like, sticking valve in valvebody, bent or worn linkage, improper fliud pressure to pistons, etc. with your help and imput we can probably narrow the problems solution down.
Posted on Feb 14, 2012
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