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Unread 09-07-2009, 06:28 PM   #1
xtremexj59
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35's and 4.56..damage possible?

hey yall,im regearing my axles(dana 30 up front & chrys 8.25 29 spline in the rear) and ill also be putting in a bearing rebuild kit(new bearings and such). i was curious to ask if i were to run 35's and 4.56 gears on open axles would this be an accident waiting to happen?

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Unread 09-07-2009, 06:33 PM   #2
99Greenmachine
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Not necessarily...now your axle shaft strength and ujoints are going to come into question...not to mention if you run with lockers or not.

If it's gonna be a street beater, i dont think it would be a problem
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Unread 09-07-2009, 06:36 PM   #3
xjfever
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No damage worries, but why 4:56 and not 4:88? The 4:88 gears would get you back closer to stock.
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  1. '95 XJ country edition, 4" coils/3/4" spacers, HD leafs with extra main added in, Ironman adjustable control arms, rough country shackles, aussie locker, JK rubicon shocks, 35" mudder's, soft 8's, cobra cb
  2. Sold'99 WJ limited, 4.7L, 3" IRO lift. Bilstein shocks, JK rubicon wheels, 255/70/17's, carolina driveshaft, IRO adjustable control arms, IRO adjustable A-arm
  3. Sold '00 TJ, 4" lift, rusty's adjustable control arms, skyjacker shocks, rock krawler adj. trac-bar,rugged ridge SYE and RE driveshaft, soft 8's, 35" mud king xt's,XJ HP D30 w/aussie locker, 4:88 yukon gears, hella 500's, rock crusher diff covers
4. 04 Dodge ram 1500 quadcab, yes, it has a hemi.
5. '08 BMW X3, Mods in progress.
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Unread 09-07-2009, 06:43 PM   #4
xtremexj59
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im running it open for the time being,i just cant afford a locker at the moment. dont burn for not doing it all at once. im running 4.56 because i have 33's on now and ill have them for awhile but i want to run 35's for the occasional mud pit or soft sand trails
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Unread 09-07-2009, 07:20 PM   #5
xtremexj59
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anyone else want to chime in. criticism is welcome
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Unread 09-07-2009, 07:20 PM   #6
xjfever
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I gotcha, The 29 splined 8.25 is only margionally weaker than the d44 so I wouldn't worry about the 35's at all.
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  1. '95 XJ country edition, 4" coils/3/4" spacers, HD leafs with extra main added in, Ironman adjustable control arms, rough country shackles, aussie locker, JK rubicon shocks, 35" mudder's, soft 8's, cobra cb
  2. Sold'99 WJ limited, 4.7L, 3" IRO lift. Bilstein shocks, JK rubicon wheels, 255/70/17's, carolina driveshaft, IRO adjustable control arms, IRO adjustable A-arm
  3. Sold '00 TJ, 4" lift, rusty's adjustable control arms, skyjacker shocks, rock krawler adj. trac-bar,rugged ridge SYE and RE driveshaft, soft 8's, 35" mud king xt's,XJ HP D30 w/aussie locker, 4:88 yukon gears, hella 500's, rock crusher diff covers
4. 04 Dodge ram 1500 quadcab, yes, it has a hemi.
5. '08 BMW X3, Mods in progress.
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Unread 09-07-2009, 07:25 PM   #7
xtremexj59
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how about transmission or transfer case failure due to the stress of the bigger tire? is it much more strain than what 33's put on it?
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Unread 09-07-2009, 07:29 PM   #8
xjfever
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The brakes and steering will be the weak points with 35" tires. Running the lower gears will save the t-case and tranny. Lots of folks run 33" tires with stock gears and get by with that set-up, although I wouldn't recommend it. So 4:56's with 35" tires will be a lot easier on the drivetrain.
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  1. '95 XJ country edition, 4" coils/3/4" spacers, HD leafs with extra main added in, Ironman adjustable control arms, rough country shackles, aussie locker, JK rubicon shocks, 35" mudder's, soft 8's, cobra cb
  2. Sold'99 WJ limited, 4.7L, 3" IRO lift. Bilstein shocks, JK rubicon wheels, 255/70/17's, carolina driveshaft, IRO adjustable control arms, IRO adjustable A-arm
  3. Sold '00 TJ, 4" lift, rusty's adjustable control arms, skyjacker shocks, rock krawler adj. trac-bar,rugged ridge SYE and RE driveshaft, soft 8's, 35" mud king xt's,XJ HP D30 w/aussie locker, 4:88 yukon gears, hella 500's, rock crusher diff covers
4. 04 Dodge ram 1500 quadcab, yes, it has a hemi.
5. '08 BMW X3, Mods in progress.
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Unread 09-07-2009, 07:34 PM   #9
xtremexj59
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what would be the weak points in the steering and what could i do to upgrade the brakes and said steering weak points?
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Unread 09-07-2009, 07:53 PM   #10
xjfever
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the tierod is the weak point in the steering, it is made of very thin tubing and will bend very easily. You can replace it with one from a V8 ZJ, which will be much beefier, or there are lots of aftermarket ones out there. The brakes are weak with stock tires and 35's will make them a lot worse. Some folks use WJ knuckles and steering, which will give you bigger brakes and a better steering set-up. There are many options for upgrading though.
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  1. '95 XJ country edition, 4" coils/3/4" spacers, HD leafs with extra main added in, Ironman adjustable control arms, rough country shackles, aussie locker, JK rubicon shocks, 35" mudder's, soft 8's, cobra cb
  2. Sold'99 WJ limited, 4.7L, 3" IRO lift. Bilstein shocks, JK rubicon wheels, 255/70/17's, carolina driveshaft, IRO adjustable control arms, IRO adjustable A-arm
  3. Sold '00 TJ, 4" lift, rusty's adjustable control arms, skyjacker shocks, rock krawler adj. trac-bar,rugged ridge SYE and RE driveshaft, soft 8's, 35" mud king xt's,XJ HP D30 w/aussie locker, 4:88 yukon gears, hella 500's, rock crusher diff covers
4. 04 Dodge ram 1500 quadcab, yes, it has a hemi.
5. '08 BMW X3, Mods in progress.
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Unread 09-08-2009, 12:33 AM   #11
bikedude189
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for the most part the only parts DOWNSTREAM from the gears will be affected. since the engine is supplying the power to the tranny/tcase/driveshafts it will see absolutely no difference in power. if you have horrible axle wrap, then you'll maybe break a u joint, but no possibility of t case or tranny damage beyond stock. and when your tires are trying to spin the axle they have a HARDER time doing it with the lower gears, so lower stress.

long story short, you should be just fine on those axles with open diffs. like said the 8.25 is plenty strong and the 30 is quite beef as well especially with the larger u joints (especially if your running 760x joins) now your weak point is probably the carrier or ring and pinion.

good luck with gears, i just did mine this weekend. couple of tips-
-get a good quality bearing puller, i spent about 200 for one on ebay, definately made my life easier
- 400 degrees in the oven is TOO HOT! it will blue the bearings (at least if they have gear oil on them, we'll see how they hold up...) try 350 or 375 degrees max, and put your pinion in the freezer, the lower pinion bearing will slide on. this trick will save you from having to use a hydraulic press
-a 4 lb sledge will often be your best friend, as well as a large pry bar
-dont compromise and be patient! its so worth it!
-disregaurd all if your having a shop do it
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