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Unread 07-12-2012, 11:26 PM   #1
FireMedic493
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2006 XK Commander 
 
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Shifting Issues in 4x4 Low

So I used the 4x4 low for the first time in about 3 1/2 weeks earlier. Had no problems dropping it into low, but when I started driving, it didn't seem to want to shift out of 1st until rpm's hit around 4,000-4,500. It did this consistantly for about 5 mins. I then tried using the stick in manual mode with the same result. I was barely using the gas, maybe 1/5-1/4 throttle. This isn't normal for my Jeep. I have had no issues with shifting between gears in 4x4 high, so I don't think it's the transmission hesitating. Both differentials and the transfer case have been serviced regularly, and it's only been aprox. 1,100 miles since I last serviced them. All fluid levels are normal. Could this problem be from me not using the 4 low enough, or is it a sign of bad things to come? I'm hoping it's nothing serious, but since it's a new problem to me, I thought I'd throw it out there to see if anyone has some knowledge on it or has the same issue.

Any insight would be appreciated

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Unread 07-13-2012, 06:37 AM   #2
yzjwk
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Sounds like it's operating normal to me . when you shift to 4 low , your transfercase shifts to 2.72:1 ratio , which basically means your engine has to rev 2.72 x higher for the same speed output . 4-low is ONLY for crawling , no faster then 25mi/hr. it uses the 2.72 plus first gear transmission ratio as a gearing power adder .by shifting into 2nd , you loose all the advantages of having it in 4 low because now your trans is in a higher gear .IMO If you can drive fast enough in 4 low to get the trans to shift then you shouldn't be in 4 low to begin with .
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Unread 07-13-2012, 07:50 AM   #3
trax95008
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Quote:
Originally Posted by yzjwk
Sounds like it's operating normal to me . when you shift to 4 low , your transfercase shifts to 2.72:1 ratio , which basically means your engine has to rev 2.72 x higher for the same speed output . 4-low is ONLY for crawling , no faster then 25mi/hr. it uses the 2.72 plus first gear transmission ratio as a gearing power adder .by shifting into 2nd , you loose all the advantages of having it in 4 low because now your trans is in a higher gear .IMO If you can drive fast enough in 4 low to get the trans to shift then you shouldn't be in 4 low to begin with .
So you think you should never leave 1st gear in 4 low?
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Unread 07-13-2012, 08:35 AM   #4
yzjwk
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no ,I just don't see much point in it .the gear ratios for the 545 are 3.0:1 - 1st and 1.67:1 in 2nd .so if your in second gear , you've just lost most of the mechanical advantage that you got by shifting to 4 low in the first place and greatly increase the risk of overspeeding your transfercase or binding up and breakingsomething . the only other advantage to shifting to 4 low is to lock the front and rear together which the QT11 and QD11 will selectively do on their own in 4 hi if needed .
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Unread 07-13-2012, 10:55 AM   #5
colinzj
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Sounds normal to me too. Shift patterns are stretched out in low range for good reasons.

In addition to what yzjwk already mentioned, the power band on newer engines is also at higher engine speeds. For the 4.7, maximum torque is at 3600 rpm and maximum horsepower's at 4500 rpm. If the TCM is shifting before that, it's giving up the grunt that's going to move you through the tough stuff.
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Unread 07-13-2012, 12:16 PM   #6
FireMedic493
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Thanks for the responses. Only reason i was concerned was that this is the first time it's happened. It normally shifts around 2,500 when I'm feathering the throttle. And no, I was not going over 15 mph. I was just inbetween obstacles on the way to a fishing spot and didn't feel like shifting out of low. Everything worked fine, was just not use tot he higher shift point with MY Jeep.

Thanks for all the help.
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