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Old 07-22-2007, 02:01 AM
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4L60E turns to slush in od

My 96 4x4 dually trans worked perfect till the 6.5 died of a broken crank,I installed a 427 industrial on gas, I retained the origional peddle and adapted a piece of an earlier peddle for the cable throttle making sure the origional switch and carb shut down and wide open at the same time.Also I drilled 4 holes in the harmonic balancer and installed 4 1/4 npt plugs to convert it into a reluctor ring and mounted the reluctance switch in an aluminum block which I mounted to the front of the block. I wasn,t able to find a spec for the air gap so I set it at .060.I changed to V belts retaining the stock 96 alternater.I wonder if the pulley ratio is critical.Now the trans seems to work fine except for od which is mush,it worked fine before.Any body have any ideas?I should perhaps mention the trans has 346,000 kms or 210,000 miles on it.also the 427 pulls nice and hard.Jack

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Old 07-22-2007, 10:06 AM
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This truck should have a 4L80E transmission, not a 4L60E.

The throttle position sensor plays a big role in this trans operation.

Are all of the upshifts on time? Meaning do they occur when they should, or are they a little early. If they are early, this may account for a mushy 4th gear. All of the upshifts may be a little softer than they were before.

Bad shift solenoids will make this trans shift soft as well.
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Old 07-22-2007, 11:05 PM
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Thanks Briscoe I stand corrected, it's a 4l80e, I would like to know if there is a basic wiring diagram anywhere on line I can access as well as an explanation as to the workings of this trans Jack
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