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  1. T

    4l60e no 1st or 4th, ez tcu

    I had the 4th piston in the servo backwards, now I have 1st and 4th
  2. T

    4l60e no 1st or 4th, ez tcu

    Haven't swapped anything yet, but I noticed when I let off the throttle all the way it shifts into 4th, anytime I give it any throttle it goes back into 3rd. If I'm going fast enough I can let off the gas and shift into 4th then shift back into 3rd and get the rpms to raise when going back to...
  3. T

    4l60e no 1st or 4th, ez tcu

    Line pressure and harness checks out, will be swapping valvebodys, and separator plates.
  4. T

    4l60e no 1st or 4th, ez tcu

    Will do, I will test transmission pressure when I get paid and then test electrical. If all checks out then I'll try solenoids... might just swap valvebodies with all new Solenoids if I go that route
  5. T

    4l60e no 1st or 4th, ez tcu

    I replaced the harness with rostra, and the 2 solenoids I replaced where durlast- ik not the best brand but I didn't have money for ac delco
  6. T

    4l60e no 1st or 4th, ez tcu

    Bought a rebuilt one off ebay.
  7. T

    4l60e no 1st or 4th, ez tcu

    On the last trans when I first got the tcu hooked up I got it to move but it wasn't consistent. Would sometimes go into reverse or drive but most of time not, eventually just wouldn't go into gear at all, kept pushing the dipstick out, and trans fluid never moved while idling, basically same...
  8. T

    4l60e no 1st or 4th, ez tcu

    Do you think a pump could cause no 1st or 4th? Im pretty confident I didn't knock the filter loose and am ready to pull the trans at this point. I will probably still swap the valve body and maybe rebuild the pump in the old unit. Transmission only has about 50 miles, you think I could get away...
  9. T

    4l60e no 1st or 4th, ez tcu

    Sweet thank you, I might give it a try, I did watch one guy on YouTube put 2 checkballs between the pwm spring to supposedly make into a on/off switch, but that was awhile back. Anyways, got to work on it today and noticed the pump stop picking up oil on dipstick from idle, and dipstick slightly...
  10. T

    4l60e no 1st or 4th, ez tcu

    Yep, that's the one I'm gonna clean up and reuse if I can't figure it out, when I opened the pan to drain the oil it looked like a 96+ valve body, if it weren't a pwm style valve body could I still use it with the pwm pump and separator plate?
  11. T

    4l60e no 1st or 4th, ez tcu

    No, this is the first time I've used this tcu and 96 valve body, transmission was controlled by the factory pcm before swap
  12. T

    4l60e no 1st or 4th, ez tcu

    So I'm guessing the manual valve also changes oil flows too? I'm thinking what if somewhere in the fluid circuit that is controlled by the manual valve circuits causing no 1st or 4th. If a solenoid blocks off fluid to the band for 1st but also blocks off the same fluid for the band in 4th gear...
  13. T

    4l60e no 1st or 4th, ez tcu

    I didn't take the transmission apart myself, originally took it to a transmission shop and they quoted me 4k, said it had a bad pump and a warped valve body. Didn't do that and ended up sitting in the bed of my truck for over a year disassembled, brought it into my work to use a parts washer to...
  14. T

    4l60e no 1st or 4th, ez tcu

    Since you mention it, I put a 1996 pwm pump, and 1996 valve body with the 1996 separator plate in 1994 case. Id imagine the valve body i got should have all 96+ solenoids for the ones that year matters. I did notice the shift solenoids that where replaced where the old style. But I'm controlling...
  15. T

    4l60e no 1st or 4th, ez tcu

    I replaced the harness when rebuilding. Only replaced both shift solenoids after finding 1st and 4th weren't there. The solenoids that came on valve body when I got it where all brand new. If you've experienced a 3-2 solenoid or another one that can cause no 1st and 4th then I'll replace the...
  16. T

    4l60e no 1st or 4th, ez tcu

    I have replaced the solenoids, sometime this week I'm gonna use a multimeter on the transharness and maybe try to ground both solenoids to put it in first..
  17. T

    4l60e no 1st or 4th, ez tcu

    Fuses look good
  18. T

    4l60e no 1st or 4th, ez tcu

    I don't think it's in limp mode, ez tcu wont turn on without a good fuse and torque converter locks up in d. Just no 1st or 4th. But I could be wrong
  19. T

    4l60e no 1st or 4th, ez tcu

    I rebuilt my first 4l60e and installed in a 1994 gmc k1500. It has a 2500 stall converter and using a ez tcu to control it. I have no 1st or 4th. Starts out in second and shifts to third like normal in d or od. Torque converter locks up too. Just no 1st or 4th. I've replaced both shift...

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