31" 3.55 or 4.10
06-09-2009, 08:32 PM
#16
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Year: 1993 2 door
Model: Cherokee
Engine: 4.0L H.O.
http://www.rocky-road.com/calculator.html
06-09-2009, 08:39 PM
#17
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Year: 1993 2 door
Model: Cherokee
Engine: 4.0L H.O.
I would not spend the money to re-gear unless I went to the 4.10s. Automatic XJs are a dime a dozen in junkyards across the country. If you want 3.55s I would bet you could buy a set of perfectly good axles out of an XJ in a JY for less than it would cost you to buy gears and pay to have them installed.
My only concern really is 4.10 being too low and cruising RPM being too high and bad for engine & mpg. I do drive 70mph sometimes.
06-09-2009, 09:18 PM
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Year: 1992 2dr Sport 2wd & 1992 4dr Laredo 4x4
Model: Cherokee
Engine: 4.0 liter H.O.
Yeah, That is a really cool chart. 
70? Is that all? This '92 really likes 75 but feels a little light @ 80. It has a real grove @ about 73mph.
Both hands on the wheel!
70? Is that all? This '92 really likes 75 but feels a little light @ 80. It has a real grove @ about 73mph.
Both hands on the wheel!
Last edited by patnok; 06-09-2009 at 09:22 PM. Reason: add content
06-09-2009, 10:31 PM
#19
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Year: 97
Model: Cherokee
Engine: 4.7
According to this you should only be at 1978.73 RPM with that setup..you sure? Thats a 1100 RPM difference.
http://www.rocky-road.com/calculator.html
http://www.rocky-road.com/calculator.html
I was thinking the exact same thing.
That speedometer must be wayyyyy off. Passing a lot of people at 60mph, perchance?
Joe
EndlessMtnFab
06-12-2009, 11:15 AM
#21
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Why not split the difference with 3.73s? Tow package XJs and ZJs have that gearing. And its not uncommon to see 3.73s in the Explorers too. I've got 31s on my ZJ and on my Explorer both with 3.73s and I don't recall my RPMs, but even with BB lift I can still pull 19-21 MPG averages. The EX is a bit heavier and more square and gets just under 18 for average.
Just another option.
Just another option.
06-12-2009, 12:36 PM
#22
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Year: 1993 2 door
Model: Cherokee
Engine: 4.0L H.O.
Why not split the difference with 3.73s? Tow package XJs and ZJs have that gearing. And its not uncommon to see 3.73s in the Explorers too. I've got 31s on my ZJ and on my Explorer both with 3.73s and I don't recall my RPMs, but even with BB lift I can still pull 19-21 MPG averages. The EX is a bit heavier and more square and gets just under 18 for average.
Just another option.
Just another option.
06-12-2009, 12:39 PM
#23
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Year: 2000
Model: Cherokee
Engine: 4.0 L Inline 6
so on that chart you have listed....do you wanna stay in the green????? cuz if that is the case then 4:10's is what you want....cuz at stock with 3:55's which is 27 or 28 tire then you are in the green..unless u have a manuel of course....jus thought i would throw that out there..that if bein in the green is what you should be in then 4:10's would be the way to go
http://jeephorizons.com/tech/rpmchart.html
http://jeephorizons.com/tech/rpmchart.html
06-12-2009, 12:40 PM
#24
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Year: 97
Model: Cherokee
Engine: 4 banger....my ***
4.10s all the way! I'm going to go up to 31's soon and I'll run 3.55s until i can find a 4.10 D30 and a 4.10 8.8 with disks and LS!
06-12-2009, 01:17 PM
#25
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Year: 1993 2 door
Model: Cherokee
Engine: 4.0L H.O.
so on that chart you have listed....do you wanna stay in the green????? cuz if that is the case then 4:10's is what you want....cuz at stock with 3:55's which is 27 or 28 tire then you are in the green..unless u have a manuel of course....jus thought i would throw that out there..that if bein in the green is what you should be in then 4:10's would be the way to go
http://jeephorizons.com/tech/rpmchart.html
http://jeephorizons.com/tech/rpmchart.html
I deduced this from using this site that someone kindly provided earlier.
http://www.rocky-road.com/calculator.html
06-12-2009, 07:14 PM
#27
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Year: 87
Model: Wagoneer
Engine: 4.0 I6
31's and 4.10's is where it is at. I am sitting at 30's and 3.55 and want to regear.
I would not pay to regear to 4.10 though just get a 8.8 out of an explorer and a 4cy dana 30 they should be stock 4.10
I would not pay to regear to 4.10 though just get a 8.8 out of an explorer and a 4cy dana 30 they should be stock 4.10
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