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  #46  
Old October 31st, 2011, 21:32
cdawall cdawall is offline
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Re: biggest allowable tire size with stock axles?

Quote:
Originally Posted by cherokeeforbyer View Post
4.56 gears and 35's will hold up on a dana 30 but i would at least get some chomoly ujoints, and the 29spl 8.25 that you have you wont have any problem with that
Meh I would keep cheapy ujoints and carry spares those are an easy weak point.
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  #47  
Old June 14th, 2021, 11:54
Muddy88yj Muddy88yj is offline
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biggest allowable tire size with stock axles?

i have 15/39.5/15 on a completely stock 97 xj with 8.5 lift stock 3.07 gears havent broke it yet.


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  #48  
Old June 14th, 2021, 17:34
VAhasnoWAVES VAhasnoWAVES is offline
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Re: biggest allowable tire size with stock axles?

I’ve broken 8.25 shafts. Broken D30 shafts. Broken chromo 44 shafts. Broken 300M u joint. All on 35s. The only thing that lead a trouble free life was my 35 spline 9” (chromo shafts).

Really come down to your usage. But 37s are beyond what most would deem “acceptable” for a D30.
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  #49  
Old June 17th, 2021, 09:36
boncrshr boncrshr is offline
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Re: biggest allowable tire size with stock axles?

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Originally Posted by danja2 View Post
U really think I have to upgrade brakes for 35's? I really wanna get the 8 inch lift and put in 35's cuz 33's with 8" is obv too small. And by swapping, what does that entitle?
You sure you want to go 8"? I just installed the IRO 4" short arm lift and minimally trimmed my fenders and have room to spare for 33x12.5 tires.
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  #50  
Old June 17th, 2021, 10:04
XJlimitedx99 XJlimitedx99 is offline
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Re: biggest allowable tire size with stock axles?

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Originally Posted by clean4drxj View Post
4.5 to 5 inches is all you'll need
I've been saying this for awhile now, but they all think they need 8!

You guys know this thread is 10 years old, right?
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'99 XJ - 4.0, AW4, NP231, HP-D30, C8.25, 6" Lift TnT Long Arms on 35s

Build Thread: Project Go Anywhere, Do Anything, Anytime.
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  #51  
Old June 18th, 2021, 07:23
boncrshr boncrshr is offline
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Re: biggest allowable tire size with stock axles?

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Originally Posted by XJlimitedx99 View Post
You guys know this thread is 10 years old, right?
Hehe..I didn't notice. To be fair, if you started a new thread someone would accuse you of not searching. BTW, this is my IRO 4" short arm lift with 33x12.5 tires. Rims are Quadratec 15" with 4" backspacing. I only minimally trimmed my fenders and feel like I could easily fit 35" tires.

I just had the rear diff re-geared with 4.56 gears and I am wondering if I should have went with 4.11 gears. At ~60mph the RPM is 2200 which isn't too good considering I travel the freeways a lot. On the other hand, I might like the lower gears when it comes time to tow something. I am considering moving up to 35" tires when these wear out. Thoughts?



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  #52  
Old June 18th, 2021, 07:26
boncrshr boncrshr is offline
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Re: biggest allowable tire size with stock axles?

Sorry, did not paste the right image. plz no bully.

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  #53  
Old June 27th, 2021, 22:23
GordoSmasho's Avatar
GordoSmasho GordoSmasho is offline
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biggest allowable tire size with stock axles?

In my experience with the more aggressive types of rock crawling a built d30 and 8.25 are reliable with a 33 inch tire. Anything larger than that and you are on borrowed time. Sure you can mud with bigger tires but if you are rock crawling with lockers, 33s are the limit imo.
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  #54  
Old June 29th, 2021, 12:14
75SV1 75SV1 is offline
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Re: biggest allowable tire size with stock axles?

'I just had the rear diff re-geared with 4.56 gears and I am wondering if I should have went with 4.11 gears. At ~60mph the RPM is 2200 which isn't too good considering I travel the freeways a lot. On the other hand, I might like the lower gears when it comes time to tow something. I am considering moving up to 35" tires when these wear out. Thoughts?'

My thoughts, I have two XJs. One is on 32.5 and 4.10's, it was on 31's and 4.10s. With 31's it was good. I forget what it RPMed at. With the 32's its a bit doggish at times. It might be one of the speed sensors on the trans. Still, it was fine on 31's. I would say, I'm at 2,200 at 70 mph. I think 4.30's would be right for it. I use it mainly as DD and highways.
My 'new' one is on 31's and 3.73's. It does good. I did take a trip a week or so back, through WV and PA, then Ohio and back to IN. Except WV, I did not have not real issues. In WV, I had to down shift to 3rd many times. I was at 1,800 at 55 mph, 2000 at 65 mph and 2200 at 70-75 mph. I was between 17.4 and 18.3 mpg. Also, a leak at the exhaust manifold and old O2 sensors. See what it does with a compact header on it.
So, if you like the MPG you are getting, I'd leave it alone or not worry about it. Also, I'd think if you go with 35's, you'd be good. Also, did you change out the Speedometer gear?
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  #55  
Old June 30th, 2021, 08:17
boncrshr boncrshr is offline
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Re: biggest allowable tire size with stock axles?

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Originally Posted by 75SV1 View Post
My thoughts, I have two XJs. One is on 32.5 and 4.10's, it was on 31's and 4.10s. With 31's it was good. I forget what it RPMed at. With the 32's its a bit doggish at times. It might be one of the speed sensors on the trans. Still, it was fine on 31's. I would say, I'm at 2,200 at 70 mph. I think 4.30's would be right for it. I use it mainly as DD and highways.
My 'new' one is on 31's and 3.73's. It does good. I did take a trip a week or so back, through WV and PA, then Ohio and back to IN. Except WV, I did not have not real issues. In WV, I had to down shift to 3rd many times. I was at 1,800 at 55 mph, 2000 at 65 mph and 2200 at 70-75 mph. I was between 17.4 and 18.3 mpg. Also, a leak at the exhaust manifold and old O2 sensors. See what it does with a compact header on it.
So, if you like the MPG you are getting, I'd leave it alone or not worry about it. Also, I'd think if you go with 35's, you'd be good. Also, did you change out the Speedometer gear?
Thanks for the info. I haven't checked my mileage yet, but if I go too much over 60 mph I can watch the fuel gauge move. And yes, I did change my speedo gear. I am seriously leaning towards just being patient and going with 35's next time. I am on the TX coast, so my offroading is almost exclusively sand and occasionally mud, which should be easier on the D30?

BTW, I did my 500 mile gear oil change on the new gears last night...wow...it looked like a thick gray milk shake.
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  #56  
Old July 2nd, 2021, 14:42
denverd1 denverd1 is offline
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Re: biggest allowable tire size with stock axles?

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Originally Posted by boncrshr View Post
Thanks for the info. I haven't checked my mileage yet, but if I go too much over 60 mph I can watch the fuel gauge move. And yes, I did change my speedo gear. I am seriously leaning towards just being patient and going with 35's next time. I am on the TX coast, so my offroading is almost exclusively sand and occasionally mud, which should be easier on the D30?

BTW, I did my 500 mile gear oil change on the new gears last night...wow...it looked like a thick gray milk shake.
don't think that's normal. you get water in the diff somehow?
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  #57  
Old July 6th, 2021, 10:04
boncrshr boncrshr is offline
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Re: biggest allowable tire size with stock axles?

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Originally Posted by denverd1 View Post
don't think that's normal. you get water in the diff somehow?
No, just the new ring and pinion. The shop that re-geared for me said it would look bad at the 500 mile break in oilchange.
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