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New stall added now bouncing rev limiter.

This is a discussion on New stall added now bouncing rev limiter. within the Automatic Transmission forums, part of the Drivetrain category; I just installed a Yank SS 4000 stall, drove 200 miles for the break-in period. Now when I go wot ...

  1. #1
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    artic white
    1998 Pontiac Trans Am

    New stall added now bouncing rev limiter.

    I just installed a Yank SS 4000 stall, drove 200 miles for the break-in period. Now when I go wot off the line, the 1-2 shift is 6400 rpm where its supposed to be, but the 2-3 shift goes all the way to 7000 rpm, and starts hitting the rev limiter, which is supposed to be set at 6500 rpm. It is the stock tranny with 114000 miles on it, but it has never acted up until now. Any clues as to what might be going on? I do have a mail order tune from Jason at TSP.
    Suncoast Creations hood, p&p throttle body, LS6 intake, Dart 225cc 2.02/1.60 heads, TSP 233/239 cam, Hooker headers, 3" duals, Yank SY 4000 stall, LS6 oil pump, double roller timing chain, iridium plugs, Moser 12 bolt with 3.73 gears. Vizage body kit.
    http://www.cardomain.com/ride/2658525

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    Member importhater81's Avatar
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    Does it feel like it's slipping at the 2/3 shift.Could be one of the shift solenoids or one of the spool valves in the valve body is binding up.

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    artic white
    1998 Pontiac Trans Am

    Quote Originally Posted by importhater81 View Post
    Does it feel like it's slipping at the 2/3 shift.Could be one of the shift solenoids or one of the spool valves in the valve body is binding up.
    No, it doesn't feel like it slips, it fact it pulls fairly well, it just will not shift when it should. Maybe time to look at a little beefier tranny.

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    Moderator Cutlass's Avatar
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    Sounds like it needs some more tuning to get that shift right.

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    King 0f n00bz shady milkman's Avatar
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    Quote Originally Posted by Cutlass View Post
    Sounds like it needs some more tuning to get that shift right.
    x2 ...when you say a mail order tune from tsp..was this before or after the stall install ?

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    Just me Y2KPewterSS's Avatar
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    Quote Originally Posted by Cutlass View Post
    Sounds like it needs some more tuning to get that shift right.

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    artic white
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    Quote Originally Posted by shady milkman View Post
    x2 ...when you say a mail order tune from tsp..was this before or after the stall install ?
    The tune was before the new stall, I replaced a Yank PT 4000 with the SS 4000. I should've mentioned that to be a little more informative, my bad. I was told that I should not need a new tune by just changing to the new stall.

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    King 0f n00bz shady milkman's Avatar
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    hmmm..i dont know what to say. off topic...how do you like your yank ? why did you swap ?

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    artic white
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    Quote Originally Posted by shady milkman View Post
    hmmm..i dont know what to say. off topic...how do you like your yank ? why did you swap ?
    So far I like the SS4000, But I have not really had a chance to test it because of the shifting problem. The PT4000 is a great stall for a mostly stock car, as it was one of my first mods, 8 years ago. I just needed to upgrade to a harder hitting stall for all the mods I have now, trying to cut my 60 ft times.

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    King 0f n00bz shady milkman's Avatar
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    Quote Originally Posted by Hwystar View Post
    So far I like the SS4000, But I have not really had a chance to test it because of the shifting problem. The PT4000 is a great stall for a mostly stock car, as it was one of my first mods, 8 years ago. I just needed to upgrade to a harder hitting stall for all the mods I have now, trying to cut my 60 ft times.
    Alright..that is what I thought...

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    Senior Member JaycenK's Avatar
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    You need a tune for that stall. A lot of people think you don't but the PCM reads it as a slip and thats why it is not shifting. I was actually at my trans guys shop today and he had a ws6 with abot 500hp + nos and had the trans out because of not tunning for the stall. He is a GM master tech and loves the 4l60E's. Because the guy did not have the car tune for the 3800 it destroyed the trans. Drove all the plants and clutches back and broke the tabs off so all the gears were engaged. When it reads the slip it goes to max line pressure. thats something like 700PSI that a good pump can make so alot of force there. Tune for it.

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    King 0f n00bz shady milkman's Avatar
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    Quote Originally Posted by JaycenK View Post
    You need a tune for that stall. A lot of people think you don't but the PCM reads it as a slip and thats why it is not shifting. I was actually at my trans guys shop today and he had a ws6 with abot 500hp + nos and had the trans out because of not tunning for the stall. He is a GM master tech and loves the 4l60E's. Because the guy did not have the car tune for the 3800 it destroyed the trans. Drove all the plants and clutches back and broke the tabs off so all the gears were engaged. When it reads the slip it goes to max line pressure. thats something like 700PSI that a good pump can make so alot of force there. Tune for it.
    he said he had a tune for the yank PT 4000 i had in there before he swapped to a yank SS 4000 ....but yeah i wouldnt hurt for a tuner to take a look at the tune just to be sure

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    Veteran 0rion's Avatar
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    you're gonna get some fluctuation from stall to stall......you just need those shift points adjusted.

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    artic white
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    Quote Originally Posted by 0rion View Post
    you're gonna get some fluctuation from stall to stall......you just need those shift points adjusted.
    Today I called Yank, TSP, and Performabuilt Tranny, and they all said basically the same thing. I need to retune for this stall and change my shuft points a little bit. Time to get ahold of Frost. Thanks for the help people.

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    Senior Member JaycenK's Avatar
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    Quote Originally Posted by shady milkman View Post
    he said he had a tune for the yank PT 4000 i had in there before he swapped to a yank SS 4000 ....but yeah i wouldnt hurt for a tuner to take a look at the tune just to be sure
    Yea but like orion said these stalls, stall somewere close to the posted speed and not right on so each varys a bit and with the LS1 PCM it is real sesitive to this. LT1 pcms could care less lol thier slow. as long as it is close usually thier ok.

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    Auto Painter RyanJM's Avatar
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    98 trans am ecms take more tuning to get the car to shift right after installing stalls or diff gears. I swapped my 3.23 for 3.73 and it to a few runs to get the shift points right in every gear especially if you changed wheel at tire sizes. They shift by speed not just setting it at a specific rpm range. My buddy usually works on newer cars. I forgot if he said 99 or 2000 is when they changes to the newer ECM which tunes better.
    1998 Trans Am 85k miles.
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    King 0f n00bz shady milkman's Avatar
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    Quote Originally Posted by RyanJM View Post
    98 trans am ecms take more tuning to get the car to shift right after installing stalls or diff gears. I swapped my 3.23 for 3.73 and it to a few runs to get the shift points right in every gear especially if you changed wheel at tire sizes. They shift by speed not just setting it at a specific rpm range. My buddy usually works on newer cars. I forgot if he said 99 or 2000 is when they changes to the newer ECM which tunes better.
    99s

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