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Old 02-04-2011, 11:36 PM   #1
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Bigger tires, mean what else?

I have 99 TJ 2.5L 4:56 gears , 4" suspension lift on 33" mudders. It also has Dana 30 front & Dana 35 rear : Q? can I go up to 35" tires with same lift and gears?
And same axles? what will I need to do?
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Old 02-05-2011, 12:02 AM   #2
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I wouldn't run anything bigger than a 33 inch tire on that 35 rearend. That's your limiting factor. Swap that out for a 44 and you'd be in business for up to 37's or so.

EDIT:

If I had another option, I wouldn't even run 33's on a 35 rear end.

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Old 02-05-2011, 12:33 AM   #3
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Quote:
Originally Posted by 4x4junkie
I have 99 TJ 2.5L 4:56 gears , 4" suspension lift on 33" mudders. It also has Dana 30 front & Dana 35 rear : Q? can I go up to 35" tires with same lift and gears?
And same axles? what will I need to do?
If you want 35's you'll need to swap the gears even lower, like at least a 5.13 ratio and the rear will need a Superior Super 35 axle upgrade kit. Also, a 1.25" body lift/ recommended motor mount lift will be needed for tire clearance and driveline angle correction. The higher you go. The more you pay! Gotta pay to play.
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Old 02-05-2011, 12:35 AM   #4
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Quote:
Originally Posted by RubiCobra
I wouldn't run anything bigger than a 33 inch tire on that 35 rearend. That's your limiting factor. Swap that out for a 44 and you'd be in business for up to 37's or so.

EDIT:

If I had another option, I wouldn't even run 33's on a 35 rear end.
Why , what can happen? I am a daily driver with some mild off roading every now and then.
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Old 02-05-2011, 12:44 AM   #5
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Why , what can happen? I am a daily driver with some mild off roading every now and then.
Then you'll probably be ok. Just figured that if you want to run 35's, you were building it for rocks or mud.
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Old 02-05-2011, 12:47 AM   #6
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Good luck.
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Old 02-05-2011, 12:49 AM   #7
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Quote:
Originally Posted by 4x4junkie View Post
Why , what can happen? I am a daily driver with some mild off roading every now and then.
even with mild stuff, your current rear end can go boom.

for 35s and the 2.5, you would want deeper gears, 4.88 is as low as you can go due to the dana 30 up front, anything deeper just does not fit. with 35 inch tires, you should also upgrade your brakes and steering.
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Old 02-05-2011, 01:00 AM   #8
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Quote:
Originally Posted by schnutzy

even with mild stuff, your current rear end can go boom.

for 35s and the 2.5, you would want deeper gears, 4.88 is as low as you can go due to the dana 30 up front, anything deeper just does not fit. with 35 inch tires, you should also upgrade your brakes and steering.
I thought 5.13s was the max? Please correct me if I'm wrong, I'd like to have my facts straight.
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Old 02-05-2011, 01:02 AM   #9
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Originally Posted by Phil05LJ View Post
I thought 5.13s was the max?
nope. 4.88s
anything deeper, and the ring gear is just to big to fit in the D30
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Old 02-05-2011, 01:03 AM   #10
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Dang!
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Old 02-05-2011, 01:08 AM   #11
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My LJ auto has 3.73s and 4.56-4.88s are recommended for the 31s on it. That is sad!
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Old 02-05-2011, 01:09 AM   #12
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Just put 35 on and start from there don't worry too much. If something broke replace with better one.
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Old 02-05-2011, 01:10 AM   #13
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Originally Posted by Phil05LJ View Post
My LJ auto has 3.73s and 4.56-4.88s are recommended for the 31s on it. That is sad!
where are you getting that from?
cause 4.56 is generally recommended for 33s and a manual transmission, and 4.88 with 35s and a manual.
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Old 02-05-2011, 01:31 AM   #14
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Quote:
Originally Posted by schnutzy

where are you getting that from?
cause 4.56 is generally recommended for 33s and a manual transmission, and 4.88 with 35s and a manual.
From Jerry! My LJ is automatic, it's the worst tranny ever! The gearing in the auto hates any tire larger than 27". I run 31" KM2s and the auto constantly shifts from 3rd to the weak overdrive resulting in horrible performance and gas mileage.
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Old 02-05-2011, 01:32 AM   #15
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Quote:
Originally Posted by Phil05LJ View Post
From Jerry! My LJ is automatic, it's the worst tranny ever! The gearing in the auto hates any tire larger than 27". I run 31" KM2s and the auto constantly shifts from 3rd to the weak overdrive resulting in horrible performance and gas mileage.
hmmm. well the autos with overdrive ive got no idea with.
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Old 02-05-2011, 01:47 AM   #16
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I had a yj that was my DD with 36x15.5 with 3.73 gears. Yes 5th gear was useless but still ran fine at legal highway speed several miles to work. Tires were great for everything but mud so would change to 39" super swampers TSL when it was wet. Played hard with no issues with D35 rear and D30 front. What can you do or what should you do? Unless you are hardcore rock crawling that has no forgiveness your axles and gears should be fine. (Unless my newly acquired tj the can't match up to a Yu, TBD)
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Old 02-05-2011, 02:18 AM   #17
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Quote:
Originally Posted by Phil05LJ

From Jerry! My LJ is automatic, it's the worst tranny ever! The gearing in the auto hates any tire larger than 27". I run 31" KM2s and the auto constantly shifts from 3rd to the weak overdrive resulting in horrible performance and gas mileage.
Scary, just acquired a tj and avidly reading this forum for advice because gotta go bigger. Presently stock auto with 30x9.5. Kicked er up to 95 (with room to spare) the other day because of comments on this site with no issues.
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Old 02-05-2011, 01:15 PM   #18
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Quote:
Originally Posted by 4play
I had a yj that was my DD with 36x15.5 with 3.73 gears. Yes 5th gear was useless but still ran fine at legal highway speed several miles to work. Tires were great for everything but mud so would change to 39" super swampers TSL when it was wet. Played hard with no issues with D35 rear and D30 front. What can you do or what should you do? Unless you are hardcore rock crawling that has no forgiveness your axles and gears should be fine. (Unless my newly acquired tj the can't match up to a Yu, TBD)
Ok so my 4:56 auto 3speed should be fine with 35s on the 30 front 35 rear ? It looks like all I'm gonna need is 2" more of lift to accommodate the tires. I'm thinking of just getting a whole new 6" long arm kit. I currently have a 4" short arm and the ride sucks
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Old 02-05-2011, 02:10 PM   #19
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Quote:
Originally Posted by 4x4junkie View Post
Ok so my 4:56 auto 3speed should be fine with 35s on the 30 front 35 rear ? It looks like all I'm gonna need is 2" more of lift to accommodate the tires. I'm thinking of just getting a whole new 6" long arm kit. I currently have a 4" short arm and the ride sucks
with a 6 inch lift there are also other things you will need to deal with, like a SYE and new driveshafts. depending on what brand lift you have, swaping out your shocks may be all you need to get a better ride. skyjacker hydros are a nice riding shock in the budget range, and for the more expensive shocks, OME and RE monotubes are nice.

since your set on keeping the weak D35, at least pick up a set of spare axle shafts and the tools necessary to swap them out in the jeep. that way should one break, your not stuck on the side of the trail or road waiting to get towed home.
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Old 02-05-2011, 02:41 PM   #20
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Quote:
Originally Posted by schnutzy

nope. 4.88s
anything deeper, and the ring gear is just to big to fit in the D30
I do stand corrected that they won't fit, they will only fit Rubicon 44s not a 30. Thanks for the correction and I apologize for posting wrong info. After all, I still have a lot to learn.
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Old 02-05-2011, 04:26 PM   #21
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I do stand corrected that they won't fit, they will only fit Rubicon 44s not a 30. Thanks for the correction and I apologize for posting wrong info. After all, I still have a lot to learn.
dont worry about it. we all have to learn some time.

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