Trans problem; won't go into gear?

[duckmanjbr]

This is a repost of a reply I already put in a diff. thread but thought it would be better off as it's own thread so...... I'm sorry for the double post!

Here's the deal - 02 LS1 motor and trans w/ 4L60e, NP harness and tune. The truck ran good for 200 in town miles over a few days then the trans just stopped. No clunk, no bang, no noise at all; just no more go. It seemed as if the trans pump stopped working and just wasn't supplying pressure to the valve body to change into gear. One minute the truck is driving down the road (grandma style) next min. the RPMs just go up like the TC isn't locked. I thought pump because even w/ a bad TC I would still feel a little something as I'm changing through the gears from park to rev or drive right? Also I saw a P1870 code once and had a few hard shifts so the bad pump made a little since to me.

So easy fix right.... replaced the TC and trans w/ a known good out of my friends car. Works great, no more hard shifts and no codes. Get ready, here's were it goes down hill...... at 230 miles of more in town driving over 3 days it's dead again! I leave the house today and made it 1 block and it's dead! The 1st time I was thinking maybe a heat thing or something but this time it only made it a block! I pushed it home! Thats how close I still was! To me thats not a heat problem at all! I checked fluid... good color and good amount. Hell its brand new so the color should be good! At idle the fluid reads good, maybe just a tad on the high side but good. With the truck off it reads way high. Like and inch over on the dip. To me this means the pump is working right? Lower fluid level when running? So now I'm all confused! I'm thinking the pump is good but it's the exact same as before. No gear works and you can't even feel a little nudge or idle change when changing through the gears so once again i don't think there is anything working in the valve body. How much of the trans is controlled from the PCM? Allen at NP was nice enough to send me 3 PCM's due to other problems getting it running and now this being the 3rd runs good but I've put a little over 400 miles on the motor and will be replacing the trans twice. There has to be something else going on! 1st trans was never taken apart. 2nd trans was easy enough swap. VSS, C1 plug and a few bolts done. It's not the 1st trans I've ever done! I'm starting to go a little crazy but I don't think it's anything I'm doing wrong. I'm leaning hard to a PCM or a wiring problem? I thought buying a harness would save me the problems but here I am........ Do I need to sync the trans or something else crazy kind the CamPS and CrackPS? Anyone ever seen this?

BTW here's a pic of the install..... if I could get it running for more than a week i might be able to put some time into making it look good!