I swapped a 2000 yukon 5.3 engine with a 2000 4l60e(tranny is a low mileage from a 4.3 V6 S10). It shifts fine at normal throttle but at WOT it will free REVs in third. Also it revs to high in 1 and 2 before shifting. I did adjust the gear ratio and tire size in hptuners. The VSS speed is dead on as well. I will upload the file when i can get it from my friend. The tune is all stock except the gear and tire change. Any ideas?
Did u check fluid level?
My setup is a 356ci with a 260/268 (212/218 at .050 lift) duration cam with aluminium corvette heads and flat top pistons running 11.3 comp. ratio. with tuned port injection and vortec crank pick up and dizzy running a 411 pcm and 60lb bosch injectors, 1.6 ratio roller rockers.For transmission its a 4l65e built with the monster in a box mega ss kit.
All in a 92 chevy ext cab 4x4 pickup with a 98 cab now installed with a third door!
running only e85
Yep, tranny level is good to go.
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