Question about 1983 GMC Jimmy

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I have a 1976 gmc 3/4 ton p/u. it has a hydramatic 400 trans. all gears worked well. at a stop light, i tried to go and barely made it across the street. reverse still works but no forward gears. what would cause such an instant problem?

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The sunshell or reation drom gears can shear off at a movements notice and cause this exact problem, the trans will have to come out and overhauled.

Posted on Sep 27, 2009

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