Question about 1997 GMC Jimmy

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4l60e automatic tranny rebuild issues

I have a 97 gmc jimmy with a 4l60e transmission that a mechanic friend of mine is rebuilding for me. He finished the internal work and reinstalled the tranny only to find that it drives fine in all forward gears but seems to have no reverse or neutral gears. he is troubleshooting on his own through testing possible issues that he can come up with but i decided to do some checking of my own to help him out. he said he had no problem getting the tranny & valve body back in & has been able to drive it but for some reason both neutral & reverse wont engage. any thoughts on things it could be from the bottom up cuz he is doing me a huge favor repairing it for me & it wil make me feel bad if he ends up having to drop the tranny all over again & it turns out to be something minor & simple. thank you for your time & assistance. -myleshigh

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  • teresa cain Jun 21, 2009

    thanks so much. i will give him a call right now to tel him what you said. it may be a couple days before i know how it worked out but this gives him other avenues to pursue. he's had a hell of a time trying to figure out what may have gone wrong with the repairs. i'll let you know how it works out in a day or two...& you'll DEFINATELY hear from me again if it doesn't help the issue cuz i'll be seeking more imput. thanks again for your time & ideas. -myleshigh



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  • 3,854 Answers

I have also personally seen/fixed a 4L60E that had a broken reverse servo piston,it is the piece that engages the low/reverse band under a cover in the valve body area,a piston with a band engagement pin. Anyone that has this problem can have it repaired in the vehicle,its worth checking BEFORE replacing the trans unless the fluid is burn't or there are other symptoms present. Good luck and hope this helps. keep me posted, be glad to help

Posted on Jun 20, 2009

  • Harvey N Tawatao
    Harvey N Tawatao Jun 20, 2009

    The other thing to if you don't mind a firmer shift, you can ask your buddy there to switch the servo with a Corvette servo. It can be done with out dropping the transmission too and takes about 45 min to do, it increases the fluid pressure to each shift piston creating better and firmer shift. The cost for the Corvette servo is around $45.00, give and take in the area you live in. Good luck and hope this helps.

  • Denis Houle
    Denis Houle Aug 10, 2013

    the servo pin not engage in reverse band. remove servo cover then have the piston and pin assembly . look inside the hole of trans case to see the band anchor. with a screwdriver try to move the band so it aligne with hole. replace the servo and pin. try it after. good luck



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