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Old 01-06-2009, 08:54 AM
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1996 chev k1500 4L60E problems

Hello, I recently rebuilt my brotherinlaws 4L60E that was in a 1996 chev k1500 all foward clutches were burnt up. I replaced all friction disks and steels, and new screens in valve body. Replaced trans in truck with help, started truck and trans went into rev,n,p ok in drive the trans was slipping horibally felt likre breaks were on, Before I realized harness was not plugged in trans got very hot, fluid remained red but was well done. i knew something was not correct put back into shop and started figuring. I had forgotten to plug the trans control harness in. the trans now goes into low gear (road test ) at 30 mph and 3000 rpm no upshift.
Pulled pan pulled valve body replaced 1-2 solinoid (the valve behind 1-2 sol, was stuck in bore spring didnt push it out, now is freed up) put valve body back in pan new fluid and still wont up shift reverse works fine not slamming into gear no leaks spedo reads fine on road test. when I let off gas at 30 mph trans coasts throttle up and trans reingauges. What have I done?

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Old 01-06-2009, 06:23 PM
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well, you did not properly rebuild this transmission. Replacement of electronics is part of a rebuild process . The 4L60E trans valve body suffers from high valve bore wear usually.

If you have one valve stuck in the v-body , were all the other valves checked?

What shape is the wire harness inside the trans in? At this age of the vehicle the harness is often very brittle and needs replaced

Did you clear all the codes out with a scanner after the vehicle was operated with out the trans connector unhooked?

You can scan the vehicle with a capable scanner ... not a code reader.

Next , I would hook a stand alone control box like the Shaffer shifter to the 4L60E and see if the trans responds to commands from the controller.

What shape was the 1-2 accumilator piston and the bore of the housing in? Often the bore is scored up and the piston center pin hole is worn out and leak internally.

Dont worry how old you are... it is the mileage on your body that adds up.
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Old 01-07-2009, 08:14 AM
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all wires and connecters were in good shape somewhat stiff, no missing insulation nor cracks in wiring. The bore of all the valves looked great as well the pistons no visable marks or wear. the scanner i have is a actron cp9185 and codes were cleared if I remember correctly while trans was disconnected. I was distracted that day someone sees scanner and wants there car looked at so I had it on 2 other vehicles that day is why I say I dont remember.
The piston was loose in the Vbody and flopping around is why i pulled it then noticed the piston was at the top of cylinder and slightly cocked and was not pushed out by spring as it did once i freed it up, I removed it and spring inspected it no polish marks or rough marks on it like uneven wear replaced it and servo.
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