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mpeugeot

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It also could be that they only list that ratio as a standard rotation. That's basically gears that are cut for use in a rear axle, turned around and used up front. While you can do that (and most companies did until the early '80s), the ring gear drives on the high pressure angle side of the tooth (normally the side used in reverse or compression braking in RWD). This puts a lot more stress on the gear teeth, and is probably harder to set up to run quiet.

For those reasons, most 4WD front axles today use a reverse-rotation cut of the gears in the front axle. Basically, they use the same tooth geometry, but have a left-hand helix to the ring gear teeth instead of right-hand. That allows them to roll forward - with the pinion pointing backwards - while still using the low-pressure angle side of the ring gear tooth.

I would imagine that, if the spline and bearings are correct, you could still use the standard-cut gears up front. But it'll probably be noisier, and will put greater stress on the teeth over the long haul.
Ya, it all depends on the pinion height, I gather the low pinion will run the gears just fine, but the high pinion wants the reverse cut gears.

I might have to re-gear both axles, but that's really not the end of the world as a set of 4.10 or 4.56's is about $600 including everything to rebuild both... It's just double the work. Of course, that would mean that I am not limited to any specific ration, I could run 5.13's if I wanted.... For the "holeshot". ;)
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mpeugeot

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Sorry guys, I didn't mean to hijack this thread. I will create a proper thread soon.
 

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I ordered the 4.27 the other day.

Yukon (YG D30-427) High Performance Ring and Pinion Gear Set for Dana 30
https://www.amazon.com/gp/product/B0078U9T5C/

I think that a 4.30:1 was also available, but since I found the 4.27, it's a moot point. I couldn't find the 4.46:1
If that's the Yukon part# you ordered, they will not work in your Bronco's M190. a D30-427 is a standard rotation long pinion D30. They won't be compatible. You'll need a reverse rotation JK30 gearset. As far as I know, they are not available in 4.27 from any aftermarket manufacturer, they jump from 4.10 to 4.56. I'd suggest doing 4.56s or 4.88s front and rear if you plan on running a larger than stock tire.
 

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Ya, it all depends on the pinion height, I gather the low pinion will run the gears just fine, but the high pinion wants the reverse cut gears.

I might have to re-gear both axles, but that's really not the end of the world as a set of 4.10 or 4.56's is about $600 including everything to rebuild both... It's just double the work. Of course, that would mean that I am not limited to any specific ration, I could run 5.13's if I wanted.... For the "holeshot". ;)
Feel free to reach out any time!
 

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mpeugeot

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If that's the Yukon part# you ordered, they will not work in your Bronco's M190. a D30-427 is a standard rotation long pinion D30. They won't be compatible. You'll need a reverse rotation JK30 gearset. As far as I know, they are not available in 4.27 from any aftermarket manufacturer, they jump from 4.10 to 4.56. I'd suggest doing 4.56s or 4.88s front and rear if you plan on running a larger than stock tire.
Ya, I will be running 33.5" tires. So, ya, I got the wrong gears... LOL. They arrived today of course... LOL. Thankfully, I can return them and honestly they weren't very expensive, so if there's any restocking fee, it's just a couple of bucks that I messed up by. I am thinking that with 33.5" the 4.56's will be perfect.

Thanks again, because, I think that this is going to be a pretty cool hack for the money, especially if I set up the gears myself (I have no excuse not to - other than being lazy).
 

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If that's the Yukon part# you ordered, they will not work in your Bronco's M190. a D30-427 is a standard rotation long pinion D30. They won't be compatible. You'll need a reverse rotation JK30 gearset. As far as I know, they are not available in 4.27 from any aftermarket manufacturer, they jump from 4.10 to 4.56. I'd suggest doing 4.56s or 4.88s front and rear if you plan on running a larger than stock tire.
Once again, BTW, thanks. I decided to get a little nutty and have some fun. Since it appears that the JK gears are the ones to get, I decided that it might be fun to throw a set of 5.13 gears front and rear (assuming that the 4.27 is not an option).

It will definitely pull hard with 5.13's (and in general I am not abusive, enthusiastic yes, but with a little mechanical empathy). What could go wrong? ;)
 

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Once again, BTW, thanks. I decided to get a little nutty and have some fun. Since it appears that the JK gears are the ones to get, I decided that it might be fun to throw a set of 5.13 gears front and rear (assuming that the 4.27 is not an option).

It will definitely pull hard with 5.13's (and in general I am not abusive, enthusiastic yes, but with a little mechanical empathy). What could go wrong? ;)
That's my plan. 5.13s or 5.38s and 37s on my 2.3 manual Badlands.

Remember, JK or JL 30 gears in front, but you'll want M220 gears in the rear. We haven't confirmed that JL rear 44 gears are a direct fit, but we'll be tearing into ours in the next few weeks to know for sure.
 

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The best part about the AMC Eagles is that the only real source of information on them is in the muddy part at the back of a junkyard, with a tree growing out of it. That and most of the people that built them and worked on them in their day are either dead or in hiding(from eagle freeks calling them at 3am for viscous coupler identification).

Eagle roadtrip video with my wife.
Eagle Adventure
That was a great video. Thanks for the share! I love the old school starwars music too.
 

mpeugeot

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That's my plan. 5.13s or 5.38s and 37s on my 2.3 manual Badlands.

Remember, JK or JL 30 gears in front, but you'll want M220 gears in the rear. We haven't confirmed that JL rear 44 gears are a direct fit, but we'll be tearing into ours in the next few weeks to know for sure.
Thanks. I am pretty sure that near as I can tell the JK44 and M220 are the same. I will get it sorted out one way or another. The 5.13's will certainly make it reasonable to run 35's later (even with the M190 as long as I am not hard core crawling it).
 

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Thanks. I am pretty sure that near as I can tell the JK44 and M220 are the same. I will get it sorted out one way or another. The 5.13's will certainly make it reasonable to run 35's later (even with the M190 as long as I am not hard core crawling it).
The JK44 is 100% NOT an M220! I can tell you with 100% certainty that JK44 gears will not work.

The (rear) JL44 is an M220 though.
 

mpeugeot

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The JK44 is 100% NOT an M220! I can tell you with 100% certainty that JK44 gears will not work.

The (rear) JL44 is an M220 though.
F' me... LOL. Well, I can return it before it ships.

Every time I think that I have these parts correct, I end up wrong lol. So let me see if I have this straight.

The front M190 is the same as the reverse cut Dana 30 or the M186 and the same as the JK front.

The M220 is the JL rear (Dana 44 size aka M220).
 
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mrnoodley

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F' me... LOL. Well, I can return it before it ships.

Every time I think that I have these parts correct, I end up wrong lol. So let me see if I have this straight.

The front M190 is the same as the reverse cut Dana 30 or the M186 and the same as the JK front.

The M220 is the JL rear (Dana 44 size aka M220).
Not all reverse rotation 30 gears are compatible with the M190, only the JK M186 and JL/Bronco/Ranger M190 gears.
 

mpeugeot

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Not all reverse rotation 30 gears are compatible with the M190, only the JK M186 and JL/Bronco/Ranger M190 gears.
Ok, that was my understanding. Thanks for restating that. Those were the ones I had ordered, but I got the wrong rear gears... Shame because it was a killer deal for both gear sets and master rebuild kits (under $500)

BTW looking at some Ford documents, they use Dana 44 and M220 interchangeably, so it might likely be that. The M190 gears are definitely the reverse cut gears. Looking for M190 stuff I saw that M-4209-470RF was a 4.70 gear for the M190. Also M-4209-513 was a Dana 44 5.13 gear and M-4209-513BF was the matching front gear for the M210.
 
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That's my plan. 5.13s or 5.38s and 37s on my 2.3 manual Badlands.

Remember, JK or JL 30 gears in front, but you'll want M220 gears in the rear. We haven't confirmed that JL rear 44 gears are a direct fit, but we'll be tearing into ours in the next few weeks to know for sure.
The JK44 is 100% NOT an M220! I can tell you with 100% certainty that JK44 gears will not work.

The (rear) JL44 is an M220 though.
I have been able to compare both Ford and Jeep versions of the Dana M220 differential case. The ring gears should, if nothing else, interchange (at least on Ford locking axles - would still need a diff swap to work on the open). Can't comment on pinion. Definitely very different from a JK or older Dana 44 though.

BTW looking at some Ford documents, they use Dana 44 and M220 interchangeably, so it might likely be that. The M190 gears are definitely the reverse cut gears. Looking for M190 stuff I saw that M-4209-470RF was a 4.70 gear for the M190. Also M-4209-513 was a Dana 44 5.13 gear and M-4209-513BF was the matching front gear for the M210.
Its unfortunate, and Jeep does the same thing. I guess you could call the M220 the modern equivalent of the Dana 44, but it is still completely un-interchangeable. Obviously, they do that for marketing and name recognition, but I think that this confusion will haunt both Wranglers and Broncos (and Rangers and Gladiators) for quite some time.
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