2-3 slips at higher boost but shifts ok while cruising

[jojo]

whats up with this?? seems to pop into 3rd good at cruising shifts, but as soon as start to add some boost 10-15# or so, or even at WOT, my knock gauge lites up to the orange and i can hear the motor start to wind as its trying to get 3rd gear, and feels to me like its slipping big time, in fact i know it is.

thanks

jojo

 

[chris718]

third clutch is giving up.try installing a b accumulator valve from a 700r4 with the original line bias spring on it from a 2004r on the end.if the clutches aint toast this will get you buy.make sure you dual feed the hi clutch or third will never be right.

 

[Lee Thompson]

dual feed high clutch

Are you calling high clutch-- DIRECT? If so this dual feed involves removing the center sealing ring on the center support and the lip seal inside the direct drum. When resealing the direct drum, there are 3 lip seals involved--- 2 on the piston and 1 inside the drum, correct? I want to try this dual feed, but I want to make sure I get it right. I currently use the teflon rings on the center support. Will 2 be enough to seal? Is there anything else I need to do? I have a billet forward drum--wide Alto band and the GOOD anchor pin. Anything missing? Thanks

 

[WE4]

FIRST thing you do is

install a pressure gauge. See if under acceleration, pressure is dropping or fluctuating. If it is , it could be something as simple as the pick up and pan assembly. However, here is the screwed part of this. It only takes ONE good slip in direct to wound it. So if this does turn out to be the problem, you may end up replacing the high clutch anyway but at LEAST you will not do it again. As far as dual feeding the high clutch, it is a good idea on tbrk units and I agree it will put more holding force to the clutch, don't get me wrong. But , you also have to compensate for that extra volume of fluid and the high clutch circuit of this trans is longer than most. So in turn, you have to slow the band release down or it may even give you a worse flair than you had to begin with. I only dual feed the brake transmissions. Also, if you dual feed with a stock forward drum and it ever shifts locked up on the 2-3 , kiss that baby goodbye. So is dual feeding the high clutch a good idea? Well, yes in SOME cases. However, most do not have the knowledge, or time, to play with apply and release to get right as the pros here do. Clearences become ALOT more critical. Most of you who play at home on your own may get frustrated quickly and hurt something in an attempt to make something "better". Have we all been there or what?

I would , before anything else, put a gauge on it and ride with someone and have them call out what the pressures are. Have someone ride with you as we would like you alive to report back what pressures you do have

Also, I have come out with a new direct clutch piston that "should" help distribute the apply force more evenly to the whole clutch face, reducing even more, the need to dual feed.
If your direct clutch is worn and has excess clearence to begin with Dual feeding is going to hinder your progress not help it.


Bruce
WE4

 

[chris718]

dual feeding requires leaving out only the lip seal located on the hi drum .then in order to remove bind up /flaring you must install a 440 modulator cup plug in the case at the hi clutch feed passage and drill it out to .125 inch.next open the third accumulator hole in the plate that knocks off the band to .125/.145 inch .last install a 2004r governor ball into the reverse feed bolt that threads into the center support.we have not used this with any other servo except for the factory gnationalc or 200 3 speed pieces so results with any other combination can not be predicted and will need to be fine tuned.also it reduces brutal reverse apply with no throttle.

 

[jojo]

Ok thanks for all the replies guys, i will look into this.


thanks

jojo

 

[c&cgn]

jojo, If you can't, or don't want to do the work on your tranny yourself give Len Freeman a call at Las Vegas Performance Transmissions. He is a stand up guy and will help you out.

 

[chris718]

i agree he has a good reputation.MAKE SURE YOU DUAL FEED IT.