How stupid would it be to run 5.13 in a D30? - Pirate4x4.Com : 4x4 and Off-Road Forum
 
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Old 03-19-2017, 05:37 PM   #1 (permalink)
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How stupid would it be to run 5.13 in a D30?

A bit of context.. I got a good deal on an 8.8 with ARB and 5.13, ready to bolt under a TJ. I'm currently running D30/35 4.10 on 35" tires. I also have a HP44 sitting in my garage waiting to be built.

Due to budget constraint, I won't be able to build the D44 this year. I know that most people wouldn't run anything lower than 4.88 in the D30, but instead of pulling the 5.13s out of the 8.8 for a year, I was considering building a HP D30 with 5.13s and truss it to minimize housing flex.

Will it self destruct by just looking at it, or should I be able to get a season of careful wheeling out of this? Any input is appreciated.
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Old 03-19-2017, 06:37 PM   #2 (permalink)
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I had 4.88 in the Cherokee on 35s and that pinion size made me feel pretty uncomfortable. I have seen the pinion for 5.13 and that itty bitty thing would never go into a jeep
I own, at least nothing as small as a d30.

I am currently building my jk unlimited in 37s and keeping the d30 (trussed, sleeved, gussets). A lot of people were pushing me towards the 5.13 gears but I just do not trust the strength.

Last edited by ranger4.0; 03-19-2017 at 06:38 PM.
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Old 03-19-2017, 06:39 PM   #3 (permalink)
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I wouldn't be any more worried about housing flex with 5.13's than I would with 4.10's. The worry would be, you will have a minimal amount of gear to gear engagement between the ring and pinion. Maybe two teeth at best. That a whole lotta gear in a little housing. Good luck.
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Old 03-19-2017, 07:16 PM   #4 (permalink)
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I wouldn't be any more worried about housing flex with 5.13's than I would with 4.10's. The worry would be, you will have a minimal amount of gear to gear engagement between the ring and pinion. Maybe two teeth at best. That a whole lotta gear in a little housing. Good luck.
Have you seen any failures with the 5.13 geared d30 axles?...
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Old 03-19-2017, 07:30 PM   #5 (permalink)
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Have you seen any failures with the 5.13 geared d30 axles?...
Can't say that I have. I don't think rational thinking requires a personal experience, and I don't believe his question was about failures I have witnessed.

I simply provided a factual statement to him,(there will be very little engagement between the ring and pinion) I didn't even tell him not to do it. If he is only gonna drive it on the road where the ring and pinion will see little backlash or abrupt no traction to heavy traction situations then sure. However, for a wheeling rig, It might not hold up as well, from a rational thinking standpoint.
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Old 03-19-2017, 08:11 PM   #6 (permalink)
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I broke 4.56's with my tj on 33's when it was new. 231, 5spd 4.0 on rubicon. Broke teeth of ring gear. I wouldn't run a lp30 unless I had to. 5.13's are crazy.

I drove gentle back then because I had no trailer fwiw.
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Old 03-19-2017, 08:24 PM   #7 (permalink)
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35s on the regular D30 gears is asking for trouble, no matter the ratio.
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Old 03-20-2017, 01:27 AM   #8 (permalink)
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It can be done just know you'll break a ring and pinion eventually. A club member of ours broke two sets of 5.13s in his 4dr JK on 35s. One in Harlan and the second at Moab.

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Old 03-20-2017, 01:30 AM   #9 (permalink)
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It can be done just know you'll break a ring and pinion eventually. A club member of ours broke two sets of 5.13s in his 4dr JK on 35s. One in Harlan and the second at Moab.

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The JK gears are cut at a different angle and are considerably stronger than the standard D30 gears...
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Old 03-20-2017, 04:34 AM   #10 (permalink)
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35s on the regular D30 gears is asking for trouble, no matter the ratio.
Well, there are thousands of jeeps out there running 35s on a D30, they might not be the strongest, but they are not made out of glass. They're also basically free.

I trailer my rig everywhere, so going home is not a concern. But I'd hate to waste a good weekend out due to a stripped ring gear. 4.10 in the 8.8 might make more sense until I can afford to built the D44 up front.

I'm not in a high traction environment either. It's mostly muddy trails and rocks around here.

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Old 03-20-2017, 05:55 AM   #11 (permalink)
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This guy has more teeth than that pinion gear.

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Old 03-20-2017, 04:53 PM   #12 (permalink)
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Hell I would just do it. You plan on building the 44 so it would just be for a while.

Just go easy on it and if it still breaks then go up in ratio.
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Old 03-20-2017, 05:33 PM   #13 (permalink)
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Quote:
Originally Posted by DirtyComanche View Post
35s on the regular D30 gears is asking for trouble, no matter the ratio.
This, the whole axle is weak.

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Originally Posted by DarK_Reaper View Post
Well, there are thousands of jeeps out there running 35s on a D30, they might not be the strongest, but they are not made out of glass. They're also basically free.

I trailer my rig everywhere, so going home is not a concern. But I'd hate to waste a good weekend out due to a stripped ring gear. 4.10 in the 8.8 might make more sense until I can afford to built the D44 up front.

I'm not in a high traction environment either. It's mostly muddy trails and rocks around here.
What are you waiting for? Order the gears. Thousands of people run them and their basically free!
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Old 03-20-2017, 05:38 PM   #14 (permalink)
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I'd wait and swap both axles at the same time. I've done the rehearing a front to match the rear. Do it once do it right.
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Old 03-22-2017, 01:30 PM   #15 (permalink)
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You bought the 8.8 because you didn't feel real good about 35's on a d35. If you install it and re-gear the front you are sort of putting your self in the same situation. Just moving the risk the front.

However, Being that your style of wheeling has not grenaded the d35 yet you should be fine for a year. You'll just cringing every time a wheel hops.

To answer your question in the subject line on a scale of 1 to 10. 7
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