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Post Fiend
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Thats not exactly true. The ring does get progressivly thinner but the pinion doesn't become any weaker. You have to get pretty crazy with the gearing to start worrying about strength. My 5.13s are plenty thick.
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From: Roseburg OR.
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Thats not exactly true. The ring does get progressivly thinner but the pinion doesn't become any weaker. You have to get pretty crazy with the gearing to start worrying about strength. My 5.13s are plenty thick.
Your 5.13 are probably ok but most folks don't have d70's.
With 9" and 44 you don't have to get crazy with gearing at all to worry about strength, especially with big tires.
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From: Marysville
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Originally posted by rogue69
bronczilla
You have 4.88s in your bronco. Do you run a 460 or 400?
What is your top speed on the highway?
I just got 4.10s becaous everyone told me to stay away from 4.56s
bronczilla
You have 4.88s in your bronco. Do you run a 460 or 400?
What is your top speed on the highway?
I just got 4.10s becaous everyone told me to stay away from 4.56s
There is nothing wrong w/ 4:56s maybe someone told you that due to your combo if you have say a 351 w/ 33" tires then 4:56s would be to low but upgrade to 36" tires then it would work....etc,etc... Depends on your preference, rig and what your running.
Post Fiend
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From: Oregon
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Actually, Randy (of Randys Ring & Pinion) told me that the pinion becomes thicker to compensate for the thinner ring gears. Looks like we have different information. You're right though, I typically think in terms of Dana 60s on up and it does become more critical with smaller diffs. I do know from talking to allot of shops opinion varies on this topic. Some would say a 4.56 in a 9" is asking for trouble and others say its fine. The tire size is a whole other bag of worms. Personally, I don't think big tires should be run on 9s or 44s unless you put in aftermarket axles and u-joints....even then I'm not real fond of it unless your rig is real light. But, I say run what you want and if you break it get a bigger axle. The only problem with that perspective is that if I break my current setup the only way left to go is Rockwells 
Last edited by proeliator; May 20, 2003 at 02:20 PM.
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From: Grande Prairie, Alberta,
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Love your Bronco, it has the same, well used look as my Jeep CJ's.
I run a Ford 9" in the rear of my latest CJ, with 4.11:1 Quality gears & an Auburn Full Spool, being in a 3000#
Jeep I didn't need to go as big on the rubber, so it runs Interco TSL LTB's 13.50x33" on 10"x15" Centerline wheels.
Let the loud pedal do the talk'n! Check out my Jeep'n homepage.
Savage CJ Home
I run a Ford 9" in the rear of my latest CJ, with 4.11:1 Quality gears & an Auburn Full Spool, being in a 3000#
Jeep I didn't need to go as big on the rubber, so it runs Interco TSL LTB's 13.50x33" on 10"x15" Centerline wheels.
Let the loud pedal do the talk'n! Check out my Jeep'n homepage.
Savage CJ Home
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From: Roseburg OR.
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Actually, Randy (of Randys Ring & Pinion) told me that the pinion becomes thicker to compensate for the thinner ring gears. Looks like we have different information
This is according to Randy of Randy's Ring and Pinion. He directed me to this page for a detailed explanation that I can give to others.
http://www.randysringandpinion.com/gear/g0100.shtml
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Post Fiend
Joined: Sep 2000
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From: Oregon
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Originally posted by rrmike
The only thing wrong with real low gearing is that the ring and pinion are weaker as you go with lower gears. 4.88 and 5.xx gearing will not hold up quite as well as 4.10 or 3.73.
The only thing wrong with real low gearing is that the ring and pinion are weaker as you go with lower gears. 4.88 and 5.xx gearing will not hold up quite as well as 4.10 or 3.73.
Last edited by proeliator; May 21, 2003 at 12:07 AM.
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From: Oregon
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Found this pic to illustrate my point...the right is a 3:54 set and the left is an 7:17...you can see that while the pinion is smaller the ring gear is much thicker.
I still say that you have to get pretty crazy (more than 5:00 gearing) in any 3/4 axle before you have to worry. BUT it is a factor that is good to be informed about.
I still say that you have to get pretty crazy (more than 5:00 gearing) in any 3/4 axle before you have to worry. BUT it is a factor that is good to be informed about.
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From: Roseburg OR.
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You're right about not really having to worry about this stuff yourself. Your diff's are pretty stout.
I just wanted folks to know there's a drawback to running real low gears with bronco running gear. Not so much the 9 but the 44 for sure.
Once the teeth are broke off the pinion gear what good does the thick ring gear do? That's the point. It's only as strong as it's weakest link.
I'm sure you've found this out the hard way with u-joints and weak axles and stuff like those stub shafts on the 60 you and your buddies have broken
I just wanted folks to know there's a drawback to running real low gears with bronco running gear. Not so much the 9 but the 44 for sure.
Thus the pinion can be considered weaker but the ring gear is actually stronger.
I'm sure you've found this out the hard way with u-joints and weak axles and stuff like those stub shafts on the 60 you and your buddies have broken
Post Fiend
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From: Oregon
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All good points Mike. Yea, I hate those weak little 35 spline alloy Dana 60 stubshafts I haven't managed to break mine yet but my buddies have. Then again, they have serious anger management issues, lol.
I haven't managed to break mine yet but my buddies have. Then again, they have serious anger management issues, lol.
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