Question about 1988 GMC Jimmy

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Will rev up to 6000 and still only be going 25mph.

There we no transmission fluid in it when we got it and it had been driven across town. We were already aware that it had an oil leak. We put 2 quarts of transmission fluid in it when we first got it and another 2 a week later. The oil was ok and we replaced the oil and air filters. A couple days after the second time we put transmission fluid into it, it started acting up. It would rev all the way up to 6000 and only be going 25 mph. We put another quart of transmission fluid in it because it was low, and it worked a little bit better but not much. We are both pretty sure that it's a transmission leak but we want a second opinion before we mess with it. If it is the transmission, can we fix it or do we have to replace it? would appreciate the help. Thanks!

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  • GMC Master
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Good chances are that the transmission needs to be replaced. Running the transmission low or without fluid will burn up the clutch pact and burn up the front pump also. With the amount of oil leaking from the transmission where was it leaking from???
Before you replace the transmission, find the leak and repair it. if it's from the transmission not bad since your going to replace it. if it's leaking in the radiator from the cooler, then your going to have to replace the radiator too and flush out your cooling system.
Good luck and hope this helps.

Posted on May 26, 2009

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Posted on Jan 02, 2017

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