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just swapped in a new motor 6.0l ls in my 2000 2500 6.0l with a rebuilt trans

the trans is a 1996 4l80e with rebuild,new solenoids,hd2 shift kit did it myself all went good got them both in truck fired it topped up all fluids went for a burn ran great, shifted good in and out of all gears fine but when I come to a red light and sit for the green and I go to take off it slips and shutters and the revs jump to 2000-2200rpm before it moves
but it doesn't do it all the time maybe every other light

I had to shorten one line to fit the 1996 4l80e from 97-up 4l80e
if I have the pressure and return lines switched would that give me bad line pressure with the trans

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its also building up heat just driving easy
like its not going to the coolers but I have flow from trans though the coolers back to the trans

the flow out the line is not steady, it shoots the fluid out then it comes out in a steady flow like its low on pressure it does that on and off

Jake's Performance

iTrader: (2)

Sounds like it's low on fluid.

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have checked(running and hot) it 5 times it reads the same right at full

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are the 1996 and 97-up dip sticks different

Jake's Performance

iTrader: (2)

No but there is no guarantee that its correct.

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just checked them their the same

would a bad epc solenoid cause any problems

I changed the boost valve with the one in the kit but I cant remember if I put the washer back in(hope I did cant find it so) will that cause this issue

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got a line pressure tester today and the line pressure jumps around from 70-30-90psi and so on in drive and the other gears

its slipping more in first gear and reverse,
when I put it in reverse it goes in smooth but I have to rev it to 2500rpm to start to move then it shudders till its moving same as first gear taking off from stop

it stalled the engine to day at red light too

Jake's Performance

iTrader: (2)

It sounds like you are either low on fluid or the filter is pluggd or not making a good seal at the case.

Add a couple of qts and see if it helps. That's for diagnosis, you've already cooked the band and clutches so once you resolve your problem, pull it out, rebuild it, and start over.

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shitty ok
is there a chance the band and clutches be alright haha

Jake's Performance

iTrader: (2)

Nope. If you rev'd it to 2500 to make it move, you compromised them.

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thx for the help
just pulled it in the garage, engaged at 1500rpm but shudder goin to check pan for anything and pull it I guess

tgui

Post pics of what you find. I like automotive snuff pics.

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fluid is clean of any chunks
but the gasket under pump looks like its pushed out at edge of boost valve(not sure if u can see it)

tgui

Fluid really does look nice! Do you have a higher resolution picture? Can you draw an arrow to where the issue you see is?

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first is where the gasket looks like it didn't sit right when installed

second is the piece of gasket I pulled out

tgui

^^ Oh wow. That can't be helping anything. I wish I knew more to help, but any leak can cause all sorts of strange behaviors.

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ya hopfully that's it im goin to look at pump just to make sure its together right

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these are the pump gears
the big one doesn't have any dots on it what so ever and there still in spec at .002/.003

need some help on how to set these right
do have the old 4l80e to pull the gears from

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pump was misaligned and took out the front bushing but so far that's about it for big damage