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Unread 03-12-2013, 10:23 PM   #1
huntbigb
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Join Date: Feb 2013
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Overdrive

What is a good way to check if my cherokee is actually going into overdrive instead of just staying in lower gears? It's running just over 3000 rpm at highway speeds

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Unread 03-12-2013, 10:38 PM   #2
chriskeenan
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1999 XJ Cherokee 
 
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Location: Colton, Oregon
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do you feel it shift (technically it just locks the torque converter) at ~43mph?

the AW4 is only a 4 speed trans, with a lock-up TC. From a slow acceleration, you should feel a shift at about 41-45mph.

Also define "highway speeds". you talking 45mph or 80mph?
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Unread 03-13-2013, 08:12 AM   #3
huntbigb
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Ok thanks, I need to pay attention at those lower speeds I was looking closer to 50-55. The highway speeds I'm talking about is 60-70
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Unread 03-13-2013, 11:01 AM   #4
Tru2Chevy
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Quote:
Originally Posted by chriskeenan View Post
do you feel it shift (technically it just locks the torque converter) at ~43mph?
Actually, the converter will lock up after it shifts into overdrive (4th gear).

OP - the easiest way to tell is to just count the gear changes when pulling away from a stop. You should be able to hear, feel, and see (on the tach if equipped) each gear change. First to second, second to third, third to 4th, then the torque converter will lock up when conditions are right. The converter locking up may feel like the trans is shifting again, but it is not. When the converter locks it is just creating a mechanical coupling of the engine and trans, where as when unlocked all the power is being transferred via fluid, thus allowing slippage.

- Justin
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1992 Cherokee Laredo - all stock, DD. Needs some minor rust repair, then on to the mods!

1996 Cherokee Classic - 3.5" lift / 31.0x10.5 Mastercraft Courser CTs / Warn XD9000i - Stripped for parts / junked :(

2004 Grand Cherokee Laredo - 4.7, bone stock - Wife's DD

NJ F-Body Owners Association
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