Question about 1999 GMC Suburban

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Trannsmisson Problems 99 GMC suburban 1500 had all fluids changed tranny oil all of it and 3 days later we couldnt get it to shift in revers but it will shift from first to second if u get the rpms up to 2500 and let off the gas and then the rest of the gears are fine and it has 4wd and it will shift in all the gears but 4low

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Check carefully to make sure it is shifting from 1st to 2nd.... there is a "sun reactor shell" inside the transmission that when broken causes reverse, 2nd and fourth to be lost. it is an extremely common failure.

best way to check.... drive along with the gear shift lever in "2" you should feel one shift as you accelerate. then carefully bump it into "3" or "D" whichever the case may be. another shift should be felt. if you do not feel a shift, you have likely stripped the teeth of that shell. hope this helps..

Posted on May 12, 2009

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Posted on Jan 02, 2017

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