Question about 1999 GMC Suburban

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Transmission 1999 gmc sierra 1500 sle 4x4 auto 4.8 short cab long bed....shifting into reverse and it sqeals and goes nowhere, reverse lights work the tranny just feels like its slipping and it can go into drive and run but shifts funky at odd RPMS and is harder shiftin as it goes up thru the gears...don't know if this is common...?? Thanks

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  • Anonymous Mar 22, 2014

    It shifts fine trough all the forward gears

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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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