Tuning a 4L60E with Transgo HD Shift Kit

[nevinsb]

http://forum.efilive.com/showthread....new-3600-stall
http://forum.efilive.com/showthread....-Release/page2

These are some of the threads that really helped me.

[blsnelling]

I'm wondering if I figured out what happened with that big flare I mentioned yesterday. I started off with the gear selector in 1st, then moved it up to 3rd after it shifted to 2nd. I'm wondering if the TCC locked at the same time it shifted into 3rd, and it was the TCC that slipped? I do know that it goes into lockup earlier in 4rd, than when I have it in D, and I've only experienced this when I didn't start with, and leave it in D.

[Taz]

Have you applied the previous discussed changes to transmission pressure, shift times, and torque reduction ? If so, have these made any noticeable change to the 2>3 shift quality ?


Regards,
Taz

[blsnelling]

Yes, I have. I just made several WOT 2-3 shifts, and there's not a hint of flare. Two of these I actually started off with it pulled down in first gear, which seemed to be a trigger before. I'm really thinking it was the TCC applying when it went into 3rd, which I now have eliminated. If I need lockup in 3rd, I can always bump it to tow/haul mode.

[Taz]

Nice to hear its working better. As you can tell, I'm a results oriented person - had to ask you how it worked out ! Once you're happy with the shift quality, and it shifts consistently, then you can revisit reducing the TR for that shift - had suggested increasing it to save the clutch pack until you sorted out the shift.

Regards,
Taz

[blsnelling]

Really strange thing happened tonight. Took off with the truck shifting normally. Then I lost OD. Came to a stop, and the truck took off in 2nd, unless I pulled it down into 1st. Still no 4th. I turned the truck off, pulled out the key, restarted it, and all was fine. What in the world could cause something like that? I didn't even make any trans changes today. I had just flashed a Desired Airflow change. Is it possible for something to get corrupted in the flash? I just flashed it again with a few changes. Hopefully I won't see this again.

[Taz]

Out of town currently ... no access to manuals ... sounds like the trans went into "limp" mode - can't remember on the 4L60E if you only have 2nd and reverse in limp ... also sounds like it was an intermitent problem - often the most difficult to diagnose.

Regards,
Taz

[blsnelling]

I wondered if it wasn't some kind of limp mode. I had 2nd and 3rd gears. Could too firm of a shift trigger that? The 2-3 shift is actually too firm now at part throttle, probably due to moving the pressure curve up when trying to fix my flare. I've dialed that back down on this last flash tonight.

[nevinsb]

Does it make a big clunk if you go from D - R - D?

[blsnelling]

Everything's normal now, and was as soon as I pulled the key and restarted it.