Installed new Trans...Having odd shifting/intermitt speedo issue.....

LOHRTBT

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So here is the rundown :
04 2wd silverado 5.3 4l60-E
126k miles. Stock motor and tune

Just had the trans rebuilt and new convertor (5 miles)
No hard driving or over 3000rpm yet.

Proper install and fluid fill was done as well as cooler and line flush to remove contaminates.

So on the first drive it seems ok but the 1-2 shift seemed a bit high.. 2200-2400 under light accel.
2-3 and 3-4 seemed to shift a bit sluggish.
Noticed the sleep was working sometime and not others.

I have checked to see that all connections are good and they are, we have no extra parts or lines or wires hanging.

Is it possible that a bad ground could cause this Condition? I was told this but not too sure. If so... Where does the trans ground to and from?

Or does it point more to the vss?

I have no ses lights or strange noises. Have driven it a couple miles here and there to see if any change but no luck

Hope I provided all info needed. Any suggestions welcome
Dave
 

04-2500HD

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Well if your vss is working intermittently the computer gets confused on the shifts. I would try a new vss. Maybe it got damaged somehow
 

silverado13

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might want to double check with whoever built it, i build 4l60es on my spare time and ive had that happen, it could be manufactuerer error
 

LOHRTBT

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GOt it figured out, The servo was acting up and we upped the line pressures a tad and all is well.
 

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