Yukon goes limp to where you have to shift from 1st to 2nd and that's all you have

Asked by Jun 27, 2017 at 04:55 PM about the 1994 GMC Yukon SLE 2dr 4WD

Question type: Maintenance & Repair

Yes my truck goes limp after 55 miles an hour then
I'm stuck with first and second gear none of the
other gears work it has a new transmission I took it
in they put it on a dyno and everything works fine I
thought my transmission had one out in the first
place and so that's why I had it done but it end up
doing the same thing before the transmission was
replaced I've tried replacing the computer and but I
can't find nobody to give me the prom for the ECM I
think the prom is the problem but I can't find
nobody to give me one when I drive in town it
drives perfectly as long as I don't go over 40 miles
an hour but soon as I get on the highway that's
when it just goes lamp and then I'm stuck in first
and second gear it's kind of hard to go in 2nd gear
at 60 miles an hour so if I could get some buddies
help for somebody's knowledge it would be greatly
appreciated thank you Fall Guy

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