Thread: Quick question about the canned 87 tow
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Old Mon, May 9th, 2011, 07:23 PM
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Originally Posted by BigSur View Post
Quick question for you guys. I've been running my canned 87 tow tune a lot lately.....I've really been liking the characteristics of the tune over anything else I've run.

I've started to notice that my 1st to 2nd upshift is very "firm" if I let it ease into gear....vs. if I'm accelerating moderately and/or towing...the shift is easier at higher RPMs. My question is.....is that a problem?...or could it cause any abnormal wear and tear on my tranny/engine? Overall, the periodic firm shift doesn't bother me....I just want to be sure I'm not hurting anything.

Thanks in advance.
It sounds like maybe the Torque Converter (TC) is locking, maybe just prior to the shift and then, since it's locked when the shift completes, you get a "jerk", since there's no fluid clutch to smooth things out. You could perhaps confirm this by monitoring the "Gear" PID on the Gryphon screen. (It's called "Comm Gear" in the monochrome Gryphon).

If that's the case, there's nothing to worry about at all. I've had it work that way during 2-3 upshifts when towing up a hill. It's a VERY "Hard" shift.

- Jack
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