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Thread: slow 1-2 shift.

  1. #1
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    slow 1-2 shift.

    ive got a 99 4t65eHD.
    the 1-2 shift is slow. with a lot of throttle it doesnt want to shift at all and it feels like being in 3rd gear in a manual, reaching for 4th and accidentally shifting into 2nd and letting out the clutch. theres that same... yank. the RPM's drop quite a bit when this happens, even at WOT.
    doesnt do it in any other gear and for the most part all other gears are quick, while downshifts are instantaneous.

    i took the filter apart and ive got no metal bits and its pretty clean. theres no clutch mud/muck. i dont think its a clutch issue. im leaning towards a valvebody issue or a 1-2 shift solenoid issue.
    anyone familiar with these valve bodies? could it possibly be a 1-2 accumulator valve, a boost valve, or a pressure regulator valve.
    i had issues earlier in the year with a bad EPC solenoid. i think most of the damage was done when i went to long before replacing it.

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  3. #2
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    bumpity bump bump.

  4. #3
    And? What's your point? White94Bird's Avatar
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    Well if you fix it once that way, then do that again.

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  5. #4
    Mud in the hvac box again FlyinGTP's Avatar
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    First off there is no need to be a dick. We all have lives outside the forum and we can't all be here every second of every day.

    whats your mod list?

    What your describing sounds like when a 4t65ehd is starting to wear out and fail or a high horsepower and torque L67 shifting at full throttle with zero torque management. It will stay in gear to long and kind of hang for a second and then bang into 2nd gear. Eventually you will get shift time to long fault with it.

    One way to combat this, and i do this in all my tunes anyways as the car is faster with a setup like this because the trans functions better. But when in performance mode you want to have a few percent of torque mangement at the shifts. It allows for a nice fast shift and helps your transaxle live longer even with a built transaxle. High hp and torque L67's are very prone to this with zero torque management. Basically your going to have 1-3 percent of torque a few hundred rpm leading up your shift.

    If your transaxles is stock and your modded the transaxle will be needing some work in the near future as in a rebuild. If is a recent build with some upgrades and no torque management just add a little at the shift.
    Peeing in people's cheerios 24/7!
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  6. #5
    Newbie PRICES GRAGE's Avatar
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    Aug 2012
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    west virginia
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    Hello i have a tranny shop in clarksburg wva i do many 4t65 they had a slow upshift in stock form but age and milage will make them worse i use a transgo shift kit and sonnax pressure regulator in all 4t65 rebuilds it makes them work very nice shifts are quick with out being harsh if u have any questions contact me 304 203 0183 josh my shops name is Prices Garage i have a facebook page for it also

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