Question about 1985 GMC Suburban

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Ive got a 2 wheel drive 85 gmc suburban 3/4ton with 454 and turbo 400. when i baught it there was a noise comin from tranny but only in first gear. it had no problems with shifting till i moved and towed a 16 foot trailer behind it. now when its cold the tranny shifts fine but when it warms up it shifts hard from 1st to 2nd and wont go into drive. sometimes i can drive it about 4 miles before it acts up other times i dont even make it a block. is there anything i could try without rebuilding it or getting a new tranny?

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You can try flushing it using Seafome and replace your filter and fluid adding some trans tune with the new oil can git this things from most part stores . Hope this helps.

Posted on May 03, 2010

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