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12-14-2008
How is the torque converter engagement supposed to feel? If I take off and go through all the gears and the converter engages I can hear it in the tone of the exhaust and I can feel it. It does not feel like a shift change but I can feel it engage. I guess what I am asking is what is normal engagement supposed to feel like and is it normal for what I am desribing? I am guessing that with an aftermarket exhaust the note change with the engagement is more noticeable than with a stock exhaust.
12-14-2008
What you're describing is normal. Should be a smooth transition, and not something like a shift. It'll definitely change the exhaust note a bit.
12-14-2008
Yep it is a nice smooth engagement and will not feel harsh at all. With loud exhaust it may not seem like it is working right as stock exhaust will muffle just about all of the exhaust noise at light throttle. The TCC system in these transmissions is a PWM (Pulse Width Modulation) and the pcm controls the apply and releas pressure to keep it feeling smooth to keep the whiny people happy. The earlier lockup systems were basically an on/off system that would feel like a shift and there is nothing wrong with that either. The nice thing about the pwm systems though is that it really smooths out engine feel so any sporadic misfire will be almost undectable in the driver seat where the older systems would allow you to feel everything as it was a solid connection between the engine and trans.
12-14-2008
Would there be a difference in the XA and XB valve bodies? Would the newer valve bodies have anything different done to the TCC valve area to make the engagement feel different?
12-14-2008
Nope TCC is the same from 97+. PCM strategy would have been the only changes made to feel. The valve body differences are basically that there were two boost valves removed on the 00+ valve bodies for forward and reverse engagement and the interchange really and you cant even tell which is why the valves were eliminated as they decided they werent needed anymore since the pcm controls line pressure and also to cut some cost.
12-21-2008
I noticed on my scans that the torque converter always engages in third gear. I checked all the shift times and they were all between .10 and .20, but were different everytime, which I guess is normal. I guess what I am asking is the torque converter supposed to engage in third gear? What about engagement time? I went with a brand new stock converter for the rebuild.
I guess I am just overconcerned about my recent rebuild. It feels really strong, the shifts even in regular mode feel really crisp, and in performance shift mode are especially nice. But I try to keep it in regular mode for the most part.
12-21-2008
Yes, third and fourth.Originally Posted by 98SilvermistGTP
What about it?
12-22-2008
By engagement time, I am asking what is normal? I am assuming it varies with load. I am just trying to check every aspect. It is just my nature, I am very confident in the build. I helped the guy do it because he was doing it on the side, and he has been working on transmissions for over 20 years with alot of experience with the 4t65. It was a very good learning experience to see somebody that really knew what they were doing take it out, disassemble, reassemble, and put it back in. Plus I got to change the oil pan gasket while the frame was off. Now I just have to get the rear valve cover gasket changed and she will be leak free.
12-22-2008
You're right. It varies by load. You'd have to hook up a scan gauge or tuner to view the duty cycle of the converter clutch solenoid to make sure it isn't maxing. If it is maxing out, then there's a problem. I never see my converter clutch solenoid go over 50% duty cycle.
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