Hummer Forums by Elcova

Hummer Forums by Elcova (http://www.elcovaforums.com/forums/index.php)

- Technical Discussion and Customizing your H2 (http://www.elcovaforums.com/forums/forumdisplay.php?f=5)

- - gear hunting (http://www.elcovaforums.com/forums/showthread.php?t=18303)

PARAGON

07-09-2006 02:47 AM

gear hunting

Has anyone experienced the gear hunting in the H2 between 4th and Overdrive. If you are light on the throttle and it goes to shift into OD it will hunt back and forth staying in either gear for 1/2 second or so.

To a passenger it sounds as though you are feathering the throttle slightly up and down about 200 or 300 RPM. But the shifts are so fast, the Tach really can't register the RPMs fast enough to see how much it's jumping.

ree	07-09-2006 04:10 AM

Re: gear hunting

Nope, just the normal TC unlock on headwind/hill. It's very decisive about it with no hunting regardless of how light or heavy I am on the throttle when it happens.

PARAGON

07-09-2006 02:57 PM

Re: gear hunting

Quote:

Originally Posted by PhilD

The TC stall is around 300 rpm. Maybe your TC is on the way out?

I will sometimes get the TC jumping in and out of lock up, especially with a head wind.

hmph, didn't think of that. I guess I should get the tranny fluid flushed/filled. It's by no means dark/burnt but it's a little darker than fresh, obviously. I wonder if it's broken down some and causing the TC lock/unlock constantly at that RPM/Throttle/Load range.

PARAGON

07-09-2006 05:33 PM

Re: gear hunting

Quote:

Originally Posted by PhilD

I've changed the ATF twice so far and both times I was surprised how much better my tranny shifted afterwards, and how much better the TC stayed locked up. Well worth trying the fluid, before delving into it further. Although I'm tempted to say something else is wrong other just the ATF.

I really didn't need that last sentence ;)

wilfred

07-09-2006 06:00 PM

Re: gear hunting

It's been awhile (last year?) but I cannot agree more how much better my tranny shifted since I got it flushed and some software updates done to it.

PARAGON

07-09-2006 06:02 PM

Re: gear hunting

Quote:

Originally Posted by PhilD

I know, but the more I thought about it, the more I started thinking TC. Is it slipping at all in any gear?

No, no other hints at any transmission issue other than that and just a little more throttle will lock it up and it's done with.

Now thinking about the TC, I'm going to drive it and see if I can get it to do it at one of the other shift points and pay more attention to the lock up throughout.

mikejr

07-10-2006 12:32 AM

Re: gear hunting

hunting is a normal feature of the GM transmissions so i have found. I've had countless GM SUV's and trucks and they all tend to hunt a bit under certain conditions. None of mine were ever bad enough for me to do anything in re the situation.

KenP	07-10-2006 05:46 AM

Re: gear hunting

Can't we hook a switch up to the TC to lock it manually? Just curious because... Well, don't worry about. But I've done it on other GM vehicles, just never thought about it with the H2.

All times are GMT +1. The time now is 08:59 AM.