Question about 1996 GMC Sierra
There is a modulator valve on transmission that has a vacuum line attached to it that may be bad or a broken vacuum line.
Posted on Nov 14, 2010
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Posted on Jan 02, 2017
Transmission model is 4L60E,and the symptoms you are describing is a common failure on these transmissions all the way back to it's predecesor,the 700 R 4 model.The reverse input shell,splines into the low/reverse planetary sun gear.The reverse input shell has a collar with splines made into it,and these splines are prone to stripping,and sometimes the collar itself will break free from the shell.Without the shell functioning,no reverse,and this is likely what you are hearing.Aftermarket companies sell heavy duty,and standard duty,replacements.Eventually,you will lose the forward gears also.Good luck.
Posted on Sep 25, 2008
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: hard shift manual transmission
check the fluid in the slave cyclinder,it looks like a brake fluid tank, you need to use brake fluid in it also, look to see if you have one for brakes and one for the clutch, fill it up to full line ,hope to help
Posted on Jul 19, 2009
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