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Old 05-08-2014, 10:31 PM   #37
NastyBuzzard
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Join Date: Oct 2013
Location: Saluda, SC
Posts: 1,273
Re: 1987 GMC V1500 Sierra Classic LS swap/build

We must have posted about the exact same time. I am getting a check engine light but no way to check it currently.

Like I said after reading I think I am in limp mode, b/c if I unplug battery and reset it acts differently at first. I am not 100% sure. Before I changed fluid it was just holding trans in 1st gear till around 25mph sometimes and sometimes 30mph.

When I first filled it with fluid and ran it through gears on jack stands it seemed fine but has developed into this. Not sure what I may have messed up.
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