Riddle me this..

Chevy1925

don't know sh!t about IFS
Staff member
Oct 21, 2009
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Does it do it with a 100% stock ECM and TCM tune?

From what brian told me, yes.

What i dont understand is why the trans is learning around or going around something that works perfect. Ill bet if i put my tcm back in it shift fine till after a few hundered miles again then get worse.
 

Mike L.

Got Sheep?
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Aug 12, 2006
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Fast learn won't help this situation. Resetting TAPs will put it in fast learn most times and the TCM will cover up the problem till it runs out of parameter as far as pressures go. Then it's back to the old problem. Could be worn out back half of the transfercase snap ring groove or maybe C3 damage. Hard to say.
 

x MadMAX DIESEL

<<<< No Horsepower
Dec 30, 2008
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Why not just disasemble the thing. Youve tried about everything else. Pretty good chance of a hard part f up wouldn't ya say

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Chevy1925

don't know sh!t about IFS
Staff member
Oct 21, 2009
21,745
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Phoenix Az
Check turbine and output speed sensors by locking trans in 4th. ( no TCC ) The numbers should read almost identical.

i did that with him the one night we went out testing with the lock up box. IIRC it showed a negitive number and the same speeds. this was a cruise without a load though. Hes got the log of it. I assume your wanting it under a WOT condition :D

Why not just disasemble the thing. Youve tried about everything else. Pretty good chance of a hard part f up wouldn't ya say

Sent from my PC36100 using Tapatalk 2

thats about where we are. Brian wanted to go to mikes when we thought we fixed it to make sure nothing was damaged internally from all this bad shifting. Pretty sure hes still going now but in the mean time, he and i may as well get as much info as we can for mike before hand. Hell, mike may jump in it, see something right away on the tech 2. I feel like we are only half testing without the tech 2 in hand.
 

Chevy1925

don't know sh!t about IFS
Staff member
Oct 21, 2009
21,745
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Phoenix Az
:rofl: hell id love to own one and may just buy one down the road soon. between my truck, the side jobs i do, brians truck and other buddies truck, im sure it will come in handy many a time. jsut need a good deal on one
 

Mike L.

Got Sheep?
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Aug 12, 2006
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:rofl: hell id love to own one and may just buy one down the road soon. between my truck, the side jobs i do, brians truck and other buddies truck, im sure it will come in handy many a time. jsut need a good deal on one

They are cheap on fleabay. Order a Candi module while you're at it.
 

SSchmi5519

LLY Cult Leader
Oct 19, 2008
3,387
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Arizona
It thinks its "learning" the shifts but in reality it learns to hang.

One of the values the trans uses to "LEARN" is incorrect and it is learning the wrong thing.
 

LWATSON

future trans limpers
Jul 30, 2008
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I'd bet its easier to just pull the whole case then split it open. The torsion bar bracket is in going to be in the way if you try to split it in place.