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4L80E 1993 6.2 no 1-2 shift
New to the forum but have been reading a ton. 1993 G30 van, ex air force, 6.2/4L80E. Problems started with dead TCU, limp mode, CEL, was run this way for a while (off road only maintenance support vehicle). Replaced TCU, swapped chips. Now have 1st, no CEL, but no upshift. Not in od, d, or...- Blue93cube
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