O/D On cherokee 2001 4.0
Junior Member
Joined: Feb 2012
Posts: 90
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From: UK
Year: 2000
Model: Cherokee
Engine: 4.0l
CF Veteran
Joined: Nov 2009
Posts: 8,172
Likes: 17
From: The Republic of TEXAS
Year: 1998
Model: Cherokee
Engine: 4.0L HO
.....but those Chinese cameras are everywhere and take fairly good pics. Like they say in the Republic of TEXAS (maybe elsewhere as well), a pic is worth 1000 words.
Herp Derp Jerp
Joined: Nov 2011
Posts: 18,251
Likes: 17
From: Parham, ON
Year: 1999
Model: Cherokee
Engine: 4.0L OBD-II
Yep, I've read the owner's manual and it does not say "do not tow in OD", as previously stated, nor does it make any reference to the torque converter locking or unlocking. The owner's manual does suggest using a lower gear in hilly areas and on severe grades thus selecting a lower gear will eliminate excessive shifting. Sounds like common sense to me as it's easy to hear the motor reving/feeling the tranny shift, no?
If one can't hear the motor/feel the tranny, they must be deaf in one ear and can't see out of the other, no? LOL
Since there is a sizable and very noticeable difference in both engine rpm and engine noise (3rd gear, 4th gear), I just presumed one would have enough common sense to slow down and select a lower gear IF the tranny was frequently shifting gears back and forth. IF the tranny down shifts out of OD occasionally, then there's no need to tow in a lower gear than OD. The owner's manual seems to say the same thing but maybe using a slightly different wording....but again, the manual does not say 'do not tow in OD'. Listen to what the motor of the tow vehicle (with a auto tranny) is tellin' ya.....and use some common sense.
If one can't hear the motor/feel the tranny, they must be deaf in one ear and can't see out of the other, no? LOLSince there is a sizable and very noticeable difference in both engine rpm and engine noise (3rd gear, 4th gear), I just presumed one would have enough common sense to slow down and select a lower gear IF the tranny was frequently shifting gears back and forth. IF the tranny down shifts out of OD occasionally, then there's no need to tow in a lower gear than OD. The owner's manual seems to say the same thing but maybe using a slightly different wording....but again, the manual does not say 'do not tow in OD'. Listen to what the motor of the tow vehicle (with a auto tranny) is tellin' ya.....and use some common sense.
Depending on terrain and if I'm paying attention, the difference between 1:1 in 4th and 1:0.78 in 5th (or about 250 RPM at my cruising speed) can go unnoticed. The AW4 has a smaller difference in ratio between direct and OD than my AX-15 does, so it's very possible that someone could not notice a shift if the RPM change isn't drastic.
Shifting gears aside it isn't that big of a deal if the torque converter is locked. The problem is when it's unlocked, which is what's going to happen if you have it in 4th and a slight hill causes the TCU to throw it open. Of course the owner's manual isn't going to mention this as it's not strictly relevant, in the same light that the operation of the valve train and A/C system isn't covered.
CF Veteran
Joined: Nov 2009
Posts: 8,172
Likes: 17
From: The Republic of TEXAS
Year: 1998
Model: Cherokee
Engine: 4.0L HO
Guess our XJ is different.....we can definitely tell/hear a difference between 3rd gear and 4th gear (OD) at say 50 mph and up......can't possibly miss the difference in sound/feel, etc. Again, all I'm saying is, the manual does not say do not tow in overdrive nor does it say for one to use common sense. The manual does seem to confusingly mix/combine engine overheating and transmission overheating (2 totally different things) into a couple of paragraphs on one page.
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