I have a 1993 GMC Vandura conversion van with a 5.7 and a 4l60e transmission that stopped pulling on the highway. Has reverse,1st and 2nd gear but no 2-3 up shift, stays in second.
Changed the filter, fluid, 2-3 shift selinoid, and checked all fuses and fusable
links, all ok. Still no 2-3 shift. Replaced the trans with a known good 4l60e
from a 1993 Chevrolet van with 5.7 (perfect swap). Does the exact same
thing. Wiring or computer problem or both, right?
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