Question about 1999 GMC Suburban
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
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