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Unread 05-22-2013, 07:38 PM   #1
mudsling
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Swaping Axles

I am stuck on running 35's on my 94 yj 2.5l 5 speed. From everything I read my options are 4.88 but I also read that 5.38 is even better for bringing my RPMS back to factory settings with 35's. Keep in mind that I do lots of highway driving. What do you guys think? What has been your experience, those that have the 2.5L running 35's. Please chime in. Thanks

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Unread 05-22-2013, 08:53 PM   #2
indiobill
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35s seem a little big for a 30 and 35. i run 33 on mine with a 2.5l with 4.88 gearing works well
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Unread 05-22-2013, 10:11 PM   #3
jsd1991yj
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The lowest gearing you can run on the d30 is 4.88. If you want to run anything deeper than that you will probably need to swap in a d44 up front and either a d44 or a ford 8.8 in the rear. Im not sure how deep you can go on a d35 but I hear the d35 will not last that long with 35's on.
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Unread 05-22-2013, 11:23 PM   #4
mudsling
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I read that the dana 30 retrofitted with 4.88 is decent up front and a 8.8 rear, but to run 5.38 what axle do I need since i read that this is the best set up for the 2.5L with 35's?
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Unread 05-22-2013, 11:29 PM   #5
Wheelin98TJ
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Quote:
Originally Posted by mudsling View Post
I read that the dana 30 retrofitted with 4.88 is decent up front and a 8.8 rear, but to run 5.38 what axle do I need since i read that this is the best set up for the 2.5L with 35's?
D44 or D60 for 5.38.

Ford 9" will get you 5.43.

8.8 does not have a 5.38/5.39 ratio, it jumps from 5.13 to 5.89.
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Unread 05-23-2013, 07:30 AM   #6
CRASHNDENT
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Gear ratio calculator

I used this calculator http://www.grimmjeeper.com/gears.html and i think with my 2.5 and auto, running 4.88's and 35's was almost exactly back to stock RPM's

Don
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Unread 05-24-2013, 11:33 PM   #7
jagular7
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Street driving a 2.5l YJ or TJ is difficult at highway speeds on hilly roads or areas where there is a lot of wind. Yes, going deeper in ratio may help but then you may catch yourself to be in between tranny gears depending on the road conditions. Other considerations for axle swap is wheels swap, parking brake setup, ds adaptability, steering setup, and shock/leaf perch setups.
Another viable option for axles is the D44 set from a Wagoneer. Since you are probably keeping the driveline as driver's drop (assuming you do have SYE for the amount of lift necessary for 35's), you should look for Waggy's from 80 and newer. Make sure you check the front axle housing and not get the vacuum disconnect like that you have now. Flange hubs are fine cause you can replace the flange cap with a manual lockout. These axles have a very low ratio available for the size they are - 5.89s! Put in lunchbox lockers. They come as SUA so you may have to change the rear leaf perch on the axle, but I'm pretty sure they'll bolt under the front. You will have to redo the shock mounts. Only issue is they are low pinion setup and not a high pinion like that of Fords. If you go with a Ford front for the high pinion, 77.5/79 F250s were leaf sprung and nearly bolt in SOA due to the 5/8" difference in layout. But these will be 8on6.5 lug pattern whereas Waggys are 6on5.5. The 77.5/79 F150 axle could work but it does take some extra effort due to the radius arm mount.
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Unread 05-25-2013, 01:13 AM   #8
Curtis32
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I have a 89 jeep and I decided to run 36" tires on my 2.5 liter with stock axles. This worked well for a while and then changed gears to 4.88 and that seems to work well on RPMs I keep waiting on the stock axles to give out so I can do a swap but they just won't give up.
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Unread 05-25-2013, 06:31 AM   #9
mudsling
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Thanks for the imfo. Well, with all this imfo, I am not sure yet how to proceed. On the clearance aspect, I have OME 2.5" leaf springs, 11/4" body lift and 11/4 shackle. I also have C&C Fab. Front tube fenders and rear. What do you guys think? Is this enough lift for 35's?
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Unread 05-25-2013, 02:05 PM   #10
95YamJam
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I have a 1" bl, 1" shackle lift, 2.5" RC SUA lift, custom front fenders and comp cut rears. I run 36's with tons of room left once i'm on the bump stops.
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Unread 05-25-2013, 02:28 PM   #11
Curtis32
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I'm running a 4" Rubion Express leaf spring and with 36'' tires I had about a inch before I cut fenders.
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