Dana 30 torque specs - JeepForum.com
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post #1 of 17 Old 08-05-2008, 10:44 AM Thread Starter
base shakers
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Dana 30 torque specs

I've found conflicting information after searching so I thought I'd ask here. What is the torque spec for the ring gear bolts and bearing caps for a Dana 30? i've heard the best way to tighten the ring gear is in a cross pattern in 10ft-lb increments. correct? Also, backlash should be 6-10 thou, right? thanks.


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post #2 of 17 Old 08-05-2008, 11:11 AM
Jerry Bransford
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55 ft-lbs for the ring gear bolts, tightening then in a star pattern is good. 60 ft-lbs. for the cap bolts, make sure the caps go back on in the same position and orientation they came off. Do NOT forget to apply Locktite to the ring gear bolt threads. And yes, that is the correct amount of backlash.

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post #3 of 17 Old 08-05-2008, 11:17 AM
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Jerry - you sure about 55 ft/lbs?

I just helped a buddy with a front lunchbox locker install and we did 80 ft/lbs.

The FSM says 70-90 ft/lbs for the particular year FSM that I'm looking at ('98).
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post #4 of 17 Old 08-05-2008, 11:27 AM Thread Starter
base shakers
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thanks jerry. your numbers match up with the yukon setup specifications but i've seen different numbers on a number of on-line write ups. sounds like the FSM is a little different as well. and yes, red loctite is your friend. i heard about a guy who got fired from a shop because he didn't follow the spec, a ring gear bolt worked its' way out and destroyed a good portion of the front end.

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post #5 of 17 Old 08-05-2008, 11:35 AM
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Quote:
Originally Posted by Wheelin98TJ View Post
Jerry - you sure about 55 ft/lbs?

I just helped a buddy with a front lunchbox locker install and we did 80 ft/lbs.

The FSM says 70-90 ft/lbs for the particular year FSM that I'm looking at ('98).
I usually just refer to the Randy's Ring & Pinion chart I have bookmarked that lists pretty much all the axles our Jeeps use and 55 ft-lbs. what it says for a Dana 30. I'd probably be more inclined to go with the FSM though and now that I think about it, the FSM does say what you said.

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post #6 of 17 Old 08-05-2008, 11:54 PM
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There are two sizes of ring gear bolt available for the D30. The smaller bolts go to 55 ft/lbs. and the larger ones to 80 ft/lbs.

Speaking from experience, if you try and torque the smaller bolts to 80 ft/lbs, the threads come off. I can't tell you how not-wonderful that feels.

I don't recall the two bolt sizes, off the top of my head - they went larger over time.

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post #7 of 17 Old 08-06-2008, 06:34 AM Thread Starter
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My '05 FSM is stating 80 ft-lbs. i guess i'll go with that!

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post #8 of 17 Old 08-06-2008, 09:18 AM
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Quote:
Originally Posted by base shakers View Post
My '05 FSM is stating 80 ft-lbs. i guess i'll go with that!
Thats what I went for during my aussie install, and started to strip one bolt. Got it to 70 ft-lbs and called it good.

CLEAN THE BOLTS AND HOLES BEFORE TORQUING THEM! I didn't do that and thats probably what my problem was.
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post #9 of 17 Old 08-06-2008, 09:50 AM
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This thread reminded me that there was a ring gear bolt size change which explains the torque differences. Anyone know when that size change happened?

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post #10 of 17 Old 08-10-2008, 10:24 AM
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Just buttoned up my D30 front Aussie install on my 99 GC. Manual said 70 to 90 ft-lbs for the ring gear bolts... I took them to 80 and everything snugged up nicely.

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post #11 of 17 Old 08-10-2008, 11:41 AM
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Quote:
Originally Posted by Jerry Bransford View Post
This thread reminded me that there was a ring gear bolt size change which explains the torque differences. Anyone know when that size change happened?
At one point, I tracked it down via FSMs "for future reference" - but I'll be darned if I can find it now. Apparently, I filed it away somewhere "safe".

Most FSMs don't show actual bolt size, but the torque will tell you.

For the OP - as long as you're using the original carrier and the new ring gear bolts are the same size as the old ones, use whatever your FSM states.

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post #12 of 17 Old 04-21-2009, 05:28 PM
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anyone know the year split? Im about to do an aussie install in my '96 HP D30 tomorrow and dont wanna strip bolts thanks

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post #13 of 17 Old 05-26-2014, 08:08 AM
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i just installed a locker and torqued RG bolts to 90lbs and streteched 2 bolts. Thinking 80 max and using loctite. had a friend loose his bolts and made a mess of things.
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post #14 of 17 Old 05-26-2014, 11:58 AM
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Quote:
Originally Posted by mrcleanjeep View Post
i just installed a locker and torqued RG bolts to 90lbs and streteched 2 bolts. Thinking 80 max and using loctite. had a friend loose his bolts and made a mess of things.
I would stick to 55 ft/lb with loctite. That's what my Nitro install book says for D30. The gears I set up have been running perfectly for nearly 2 years... If 55 ft/lbs provides enough clamping force on the ring gear then there's no reason to increase it even with bigger bolts.

Typically FSMs list torque specs for DRY bolts, where most install books specify the use of loctite and, my guess, is their torque spec accounts for that, hence the lower torque.

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post #15 of 17 Old 05-26-2014, 02:13 PM
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I've never geared a d30 that didnt use 3/8 bolts. Maybe they exist, but I've never seen one.

Whenever possible go with the FSM.

Toque around the clock in 5-10lb increments. Do not try and get 80 lbs before your third or fourth lap. Thats how you end up breaking them off.

55 is light. Sure it might hold fine, but it is light.
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