Question about 1990 GMC Suburban

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Transmission problem Auto trans shuttering when needing to go in passing gears. What can I do? ron

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  • rgwhilden Oct 14, 2008

    Thank you very much I will try that. Ron WHilden

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Tansmission will not stay in overdrive

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Ok the 1st thing to do is change the fluid and filter, while the pan is off look for excess debris from the clutch packs, there will be some stuff in the pan, but if there is allot then the clutches are starting to fail and you will need an overhaul, how many miles on truck, 60,000 is recommended change for trans fluid, also use the latest GM approved Dextron 5 fluid, it is the best around and makes old transmissions shift much better, I used it in my 96 Corvette and what a difference!

Posted on Oct 13, 2008

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Rory
Its your body valve in the gear box which is not letting the pump on forward gears pump enough oil to the forward band and because the band isent tight it is slipping..
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Let me know how you get on ........................Ron

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