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1999 - 2006 (GMT800) Section for all discussion related to the 1999-2006 Chevrolet and GMC trucks.

Transmission issues

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Old August 24th, 2018, 6:28 PM
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Default Transmission issues

So my factory trans with 240k finally gave out. I bought 1 from a good buddy that was 100% g2g. I get it installed and this is where I'm at.

reverse works perfect
1st perfect
2nd perfect
3rd is like neutral until around 3800rpm then pulls like a tractor but will tach out only doing about 45mph, seems slow for 3rd. 2nd will run into the mid 50s before rpms get that high.
will not shift to 4th

from dead stop manual shifting on column
reverse strong
1st strong
2nd strong
3rd strong

dead stop in 1st rolling through to drive
1st is strong
2nd strong
3rd acts like neutral till around 3800rmp
will not shift to 4th

Old August 26th, 2018, 4:22 PM
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Unless it's a unknown trans issue, you sure you got all the plugs plugged in?
Old August 27th, 2018, 9:15 AM
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Yes I suspect electrical issue. I cleaned all plugs with cleaner and blow gun. To me it feels like when it s




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