wierd problem after transgo shift kit

[dougs01gt]

I installed my shift kit a few weeks ago. All went well and it works well except if i really get on it, when i catch second gear the truck kind of falls flat for a second. Im assuming this is caused by the torque managment?? If so how can i fix this?

 

thanks all.

[snoman]

I installed my shift kit a few weeks ago. All went well and it works well except if i really get on it, when i catch second gear the truck kind of falls flat for a second. Im assuming this is caused by the torque managment?? If so how can i fix this?

 

thanks all.

 

<{POST_SNAPBACK}>

 

 

 

The engine RPM drops so quickly with the shift that the ECM does not know how to deal with it. You should be able to get round it with a custom tune but be advised that if it is a 4L60E that the sprags are not that strong in it and if you hammer the shifts too hard too often they will fail and shell out the tranny. I have seen it happen more than once. THe shifts are modulated from the factory for a reason.

[asilverblazer]

I installed my shift kit a few weeks ago. All went well and it works well except if i really get on it, when i catch second gear the truck kind of falls flat for a second. Im assuming this is caused by the torque managment?? If so how can i fix this?

 

thanks all.

 

<{POST_SNAPBACK}>

 

 

 

The engine RPM drops so quickly with the shift that the ECM does not know how to deal with it. You should be able to get round it with a custom tune but be advised that if it is a 4L60E that the sprags are not that strong in it and if you hammer the shifts too hard too often they will fail and shell out the tranny. I have seen it happen more than once. THe shifts are modulated from the factory for a reason.

 

<{POST_SNAPBACK}>

 

 

 

 

The shifts are modulated to keep the mommies in the Tahoes and Suburbans happy.

[snoman]

I installed my shift kit a few weeks ago. All went well and it works well except if i really get on it, when i catch second gear the truck kind of falls flat for a second. Im assuming this is caused by the torque managment?? If so how can i fix this?

 

thanks all.

 

<{POST_SNAPBACK}>

 

 

 

The engine RPM drops so quickly with the shift that the ECM does not know how to deal with it. You should be able to get round it with a custom tune but be advised that if it is a 4L60E that the sprags are not that strong in it and if you hammer the shifts too hard too often they will fail and shell out the tranny. I have seen it happen more than once. THe shifts are modulated from the factory for a reason.

 

<{POST_SNAPBACK}>

 

 

 

 

The shifts are modulated to keep the mommies in the Tahoes and Suburbans happy.

 

<{POST_SNAPBACK}>

 

 

 

 

 

And to extend component life too.

[Bish]

I installed my shift kit a few weeks ago. All went well and it works well except if i really get on it, when i catch second gear the truck kind of falls flat for a second. Im assuming this is caused by the torque managment?? If so how can i fix this?

 

thanks all.

 

<{POST_SNAPBACK}>

 

 

 

The engine RPM drops so quickly with the shift that the ECM does not know how to deal with it. You should be able to get round it with a custom tune but be advised that if it is a 4L60E that the sprags are not that strong in it and if you hammer the shifts too hard too often they will fail and shell out the tranny. I have seen it happen more than once. THe shifts are modulated from the factory for a reason.

 

<{POST_SNAPBACK}>

 

 

 

 

The shifts are modulated to keep the mommies in the Tahoes and Suburbans happy.

 

<{POST_SNAPBACK}>

 

 

 

 

 

And to extend component life too.

 

<{POST_SNAPBACK}>

 

 

 

 

More for the mommies in their suburbans. IMO, a shift kit actually increases tranny life by reducing heat and slippage. During that lazy, slow, soft stock shift, the bands are slipping generating heat and wear. A shift kit with firmer shifts should extend the life of components. Unless, of course, you now beat your vehicle more because it's more fun to drive. Now, the rest of your driveline may take more of a beating without TM but I think TM is not necessarily good for the tranny.

 

The torque management really rears it's head when you beef up the trans. I can actually tell the instant TM goes off. Right after the 1-2 shift, it falls on it's face for about 3 seconds and then you can definitely feel the power kick back in. On my truck, it feels like TM is too late anyhow. I can get a nice hard 1-2 shift but TM doesn't kick in untill AFTER the shift is done. I can't figure out how it helps the driveline given what I feel.

 

THat's ok though, the tune I ordered should take care of TM

[snoman]

More for the mommies in their suburbans.  IMO, a shift kit actually increases tranny life by reducing heat and slippage.  During that lazy, slow, soft stock shift, the bands are slipping generating heat and wear.

 

<{POST_SNAPBACK}>

 

 

 

 

That is debatable because you do not have to bang a shift to not slip. When you bang the shift hard you put more stress on the internal parts and the clutch surface because you are not only coupling power but momentum for engine spining and though the slip cycle during shift might be a bit shorter you are shearing the surfaces and oil between them much harder and making about the same clutch plate heat in a shorter time frame because the same relative energy is being routed. Next you will tell me the your brakes will last longer if you wait to last minute and always stop like heck vs moderate stops. I little higher line pressure might not be bad but harder shifts are not needed and you also have to factor the possible life expectancy effect of internal clutch seals from higher line pressures. There is more to this than meets the eye.

[sonjaab]

DOUG................Its prob. the infamous "torque mgmt. program

in the new GMs.

 

Check out this link for good explaination and graphs on how it

works..................

http://www.fullsizechevy.com/forums/showthread.php?t=123667

 

I just installed a Hypertech 3 programmer and adjusted for firm

shifts and it will snap your neck AND bark the tires 1-2 shift !

[Bish]

More for the mommies in their suburbans.  IMO, a shift kit actually increases tranny life by reducing heat and slippage.  During that lazy, slow, soft stock shift, the bands are slipping generating heat and wear.

 

<{POST_SNAPBACK}>

 

 

 

 

That is debatable because you do not have to bang a shift to not slip. When you bang the shift hard you put more stress on the internal parts and the clutch surface because you are not only coupling power but momentum for engine spining and though the slip cycle during shift might be a bit shorter you are shearing the surfaces and oil between them much harder and making about the same clutch plate heat in a shorter time frame because the same relative energy is being routed. Next you will tell me the your brakes will last longer if you wait to last minute and always stop like heck vs moderate stops. I little higher line pressure might not be bad but harder shifts are not needed and you also have to factor the possible life expectancy effect of internal clutch seals from higher line pressures. There is more to this than meets the eye.

 

<{POST_SNAPBACK}>

 

 

 

 

 

Agreed if you are slamming gears. I'm suggesting a firm shift is better than a slow mushy one. No doubt if there is any "banging" or "head snapping" you are putting heavy stress on the drivetrain and it will wear or break faster..

 

The brake comparison is totally irrelevant as brakes are not wet clutches with multiple somewhat complex systems. I still stand by my opinion that firm shifts during normal operation is better for the longevity of the drivetrain compared to mushy soccer mom shifts. Not that there is anything wrong with soccer moms...my wife is one But then again, she much prefers her Town & Country compared to my Tahoe.