Won’t shift at WOT any advice?

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Trey Hardy

Trey Hardy

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If the tranny was toasted then I would expect it to be slipping aound 2-3k well before 5k. Check filter make sure that it is fully seated into the valve body and has not dropped down into the pan.
That’s kinda what I was thinking because the exhaust we couldn’t fully drop the pan and was awkward working on it I guess ima start with the pan and filter I diddnt know if any of those solenoids would cause a issue like this I’ve never had a trans go out on me before
 
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Trey Hardy

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That’s kinda what I was thinking because the exhaust we couldn’t fully drop the pan and was awkward working on it I guess ima start with the pan and filter I diddnt know if any of those solenoids would cause a issue like this I’ve never had a trans go out on me before
My in-law said to change the fluid sounds like there’s not enough pressure getting through to engage it fully and could be something in the filter or the filter might not be on there right
 

Just Fishing

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There is a high rpm transmission pump spring to prevent pressure loss at higher rpm.

It sort of sounds like it might be related.

In a 700r4 i had to install a shift kit just so it would up shift at wot..
 

89Suburban

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Sorry Trey good luck my man. Hope it’s not something serious.
 
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Trey Hardy

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There is a high rpm transmission pump spring to prevent pressure loss at higher rpm.

It sort of sounds like it might be related.

In a 700r4 i had to install a shift kit just so it would up shift at wot..
Down shifts fine it’s just once it breaks 5,000-5,500 rpm the TC let’s go and it don’t want to shift like it should until I let off the throttle but definitely can’t get a full “pull” out of it which kind of sucks I drove it to the Christmas party today for all my nephews to see driving normally it acts fine I don’t get it the corvette servo diddnt do much my next guess is to change the pan fluid and filter again debating on doing Servos what time I’m in there also the truck has sat up for two years straight
 
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Trey Hardy

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There is a high rpm transmission pump spring to prevent pressure loss at higher rpm.

It sort of sounds like it might be related.

In a 700r4 i had to install a shift kit just so it would up shift at wot..
Definitely feels like it either looses pressure and don’t have enough to engage the clutch’s or the torque converter is free spinning because it’ll redline if I hold the throttle wide open
 
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Trey Hardy

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B-train

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My question is WHY are you so concerned about shifting at WOT 6100 rpm? Do you enjoy working on stuff that much? If it's the vehicle in the first post, you might want to consider a civic or something like that designed to run high rpm. You gain nothing other than premature wear, ****** fuel economy, etc from basing driving off that.

If I'm wrong, and you're a dragstrip oficinado, then I apologize. If you're looking for this to run down public roads and be a nuisance, I don't apologize.

But to get to the question, there are usually torque limiting safeties built into calibrations to prevent this type of abuse. Usually they will cut fuel and force a shift to the next gear, but if you already effed up the trans, that could be your issue. Sounds like you need a built trans and calibration to handle what you are trying to do.
 

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