Need some 4L80e help
03-13-2016, 04:38 PM
#1
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Need some 4L80e help
I finished swapping a '01 6.0L/4L80e/t-case into my 95 K1500. The trans had about 95k on it and I installed a shift kit and filter/fluid during the swap. It ran well for about 65mi with the only issue being a very hard 1-2 shift. Problems started and I changed the filter fluid again about 5mi ago. Now I have a few issues that I'm trying to sort out, see if they're related, etc. I'm really hoping it doesn't need a rebuild already.
1. At idle in R & N it will walk itself forward. If I give it some throttle, it'll back up but you can feel it overcoming internal resistance.
2. The harsh shift is gone. It doesn't slip or slow shift, but it also doesn't act like it has a shift kit or torque management removed.
3. The pressure fluctuates. I hooked up a gauge and shifting from R through 1 at idle the pressure will hover at about 30psi, sometimes dropping to 10, other times spiking to 60psi. Once I hit first, pressure will hold steady at about 60psi as I shift back up through the gears.
I dropped the pan again and the fluid is almost black (with about 5mi on it). I have never found any metal in the pan.
I'm thinking the fluid could explain #2 & 3. Would a full flush correct this and clear all contaminants out, including the torque converter?
What about #1? Everything I've seen suggests that welded directs won't allow it to back up at all.
1. At idle in R & N it will walk itself forward. If I give it some throttle, it'll back up but you can feel it overcoming internal resistance.
2. The harsh shift is gone. It doesn't slip or slow shift, but it also doesn't act like it has a shift kit or torque management removed.
3. The pressure fluctuates. I hooked up a gauge and shifting from R through 1 at idle the pressure will hover at about 30psi, sometimes dropping to 10, other times spiking to 60psi. Once I hit first, pressure will hold steady at about 60psi as I shift back up through the gears.
I dropped the pan again and the fluid is almost black (with about 5mi on it). I have never found any metal in the pan.
I'm thinking the fluid could explain #2 & 3. Would a full flush correct this and clear all contaminants out, including the torque converter?
What about #1? Everything I've seen suggests that welded directs won't allow it to back up at all.
03-14-2016, 08:37 AM
#4
I had similar clutch material right after my 80e build because of a stuck AFL valve, but I doubt very much thats your case.
I don't know much more than that.
