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Unread 06-10-2013, 06:08 PM   #1
Cherokeeboy
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1988 XJ Cherokee 
 
Join Date: Jun 2013
Location: Petersburg, Va
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88 cherokee 2.5l

Hi I have a 2.5l cherokee xj. I was wondering would it kill the engine to out 33" tires on it?

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Unread 06-10-2013, 10:58 PM   #2
Puck81
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Auto or 5 spd?? Also, what mods do you have to run 33's?
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Unread 06-11-2013, 06:09 AM   #3
mschi772
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1997 XJ Cherokee 
 
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I wouldn't run 33's on a 4.0 with stock gearing. If you change your gears, I'd say it would be fine.
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Unread 06-11-2013, 06:16 AM   #4
7179CJ5
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What's the difference between having an auto or 5 speed, is one better than the other?
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Unread 06-11-2013, 06:43 PM   #5
mschi772
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Quote:
Originally Posted by 7179CJ5 View Post
What's the difference between having an auto or 5 speed, is one better than the other?
Your 88 2.5 should be paired to a Aisin-Warner AX5. I'm not super familiar with the AX5, but the AX15 that the 4.0 manuals use is a very good transmission. An 88 automatic would have been a...Chrysler A904 I think? Anyway, don't fret about the quality of your transmission. Some are better than others, but I don't think any of the XJ's trannies were truly bad.

The different transmissions have different gear ratios of their own necessitating different rear axle gear ratios. And unless the torque converter of an auto is locked, not all engine power is transferred directly through the transmission.

This calculator might be extremely handy for you. http://www.manoian.net/jeep/gear_ratio_calculator.html

I don't have the exact dimensions of the 2.5 and no time to do the math right now anyway, but I'd say that your ideal cruising RPM should be at 2500; probably about 3000 RPM more likely. Here's another link you might find useful that I just scrounged-up for you: http://www.jedi.com/obiwan/jeep/2.5Lpower.html
This is just based on my quick educated guesswork, so I might be off a little, but if I were you, I think regearing to 4.56 give or take. Maybe even 4.88 if your big into wheeling.

Asking the YJ guys might get you some more wisdom as many of them had/have your 2.5 and AX5 drivetrain.


P.S. Listing all other mods you're running can be very helpful.
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Unread 06-12-2013, 08:57 PM   #6
Nick05
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1987 MJ Comanche 
 
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bout time we got another 2.5 xj on here. we are few and far between. i know there are some yj's in my area running 35's with the 2.5(don't ask me how, mine does good to spin the 235's). the yj guys would be more knowledgeable since they have more 2.5's the most xj guys
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Unread 06-16-2013, 12:01 PM   #7
Cherokeeboy
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It's a 4spd. Plus j would like to know how much lift is possible before t gets to be to much further jeep
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