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Thread: Why does 1st gear slam into 2nd? 4L80E translplant

  1. #11
    Lifetime Member 5.7ute's Avatar
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    I would also be fitting a guage to the test port & seeing what pressures you have. You may have some hardware issue with the kit that is causing inflated line pressures.
    The Tremor at AIR

  2. #12
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    Your tune looks OK to me so I would focus on the wiring. Maybe the converter is locked? Have you logged the trans parameters to get a better idea on whats going on? Attached is what I log for the trans.

    Lee
    Attached Files Attached Files

    230" Dragster - 2000 LS1, 02020003 Speed Density, PRC 2.5 Heads,
    MS3 Cam 237/242 .603/.609, Vic Jr. intake, Holley 1000CFM TB,
    PowerGlide, 5000 stall converter. 8.70@154 MPH

    My Projects Homepage: http://www.horsepowerracing.com

  3. #13
    Senior Member 1SlowHoe's Avatar
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    Quote Originally Posted by jfpilla View Post
    I realize your not getting any codes. But since nothing is working so far, you might try setting E0802 to 50.
    What will this do?
    Driving a truck with a BLOWN engine has two meanings. I get to experience BOTH on a regular basis
    2006 GTO....in progress
    2002 6L/80E/Radix/ Tahoe

  4. #14
    Senior Member 1SlowHoe's Avatar
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    Quote Originally Posted by 5.7ute View Post
    I would also be fitting a guage to the test port & seeing what pressures you have. You may have some hardware issue with the kit that is causing inflated line pressures.
    I just replaced the entire valve body and solenoids tryin to solve this. I double checked the wiring but I can check again this wknd when I get a chance. I had a gauge on there before and I cant really remember what it said but if I remember right it was pretty high, over 150 psi at any throttle position.
    Driving a truck with a BLOWN engine has two meanings. I get to experience BOTH on a regular basis
    2006 GTO....in progress
    2002 6L/80E/Radix/ Tahoe

  5. #15
    Senior Member 1SlowHoe's Avatar
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    Quote Originally Posted by LS1_Dragster View Post
    Your tune looks OK to me so I would focus on the wiring. Maybe the converter is locked? Have you logged the trans parameters to get a better idea on whats going on? Attached is what I log for the trans.

    Lee
    I dowloaded your files but I really have no idea how to set up a pid file to scan these while driving. Is there a step by step on how to set this up so I can log and post for you guys?

    I feel the converter lock and unlock during daily driving so I dont think its locked all the time.
    Driving a truck with a BLOWN engine has two meanings. I get to experience BOTH on a regular basis
    2006 GTO....in progress
    2002 6L/80E/Radix/ Tahoe

  6. #16
    Senior Member 1SlowHoe's Avatar
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    I also loaded this tune which I added 100% TQ management in and dropped line pressure 75% and it made no difference. wtf?
    Attached Files Attached Files
    Driving a truck with a BLOWN engine has two meanings. I get to experience BOTH on a regular basis
    2006 GTO....in progress
    2002 6L/80E/Radix/ Tahoe

  7. #17
    Lifetime Member 5.7ute's Avatar
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    Save the trans.pid file in the MY Documents/efilive V7.5/pids folder.
    Then when you open the scan tool select the pids tab, then the open an existing pid file
    icon. This will give you a list of presaved pid files. Select the new trans file & you will have all the necessary pids that Lee uses.
    The Tremor at AIR

  8. #18
    Lifetime Member jfpilla's Avatar
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    Quote Originally Posted by 1SlowHoe View Post
    What will this do?
    If the PCM thinks the trans is slipping it raises line pressure and causes hard shifts. Just a shot in the dark. It won't hurt to try it.
    2003 red vert
    Mods:
    LS7 crate engine, wet sump, 24xx reluctor
    LPE 100mm MAF
    Vararam, cold air intake and bridge
    RPM Level 6/4L60e trans
    3.42 gears
    Yank SS3600
    1-7/8" AR headers
    Z06 exhaust
    470rwhp 437rwtq
    1/8th mi-1.526-60'-6.862-1/8th-@100.74mph

  9. #19
    Senior Member 1SlowHoe's Avatar
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    Hope this helps!
    Logged from the attached tune

    VIN:1GNEC13ZX2R133495
    6.0
    Attached Files Attached Files
    Driving a truck with a BLOWN engine has two meanings. I get to experience BOTH on a regular basis
    2006 GTO....in progress
    2002 6L/80E/Radix/ Tahoe

  10. #20
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    Somethings not right, your trans pressure stays at 90psi most the time and the converter slippage matches the engine RPM which is probably causing the line pressure to go so high. I'm no expert but it does look like VSS is out of whack and wired incorrectly.

    Lee

    230" Dragster - 2000 LS1, 02020003 Speed Density, PRC 2.5 Heads,
    MS3 Cam 237/242 .603/.609, Vic Jr. intake, Holley 1000CFM TB,
    PowerGlide, 5000 stall converter. 8.70@154 MPH

    My Projects Homepage: http://www.horsepowerracing.com

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