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General Forums => The Mess Hall => Topic started by: kbar on April 09, 2012, 06:43:41 PM
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I can't not seem to find what gear ratio I need to run with my dana 44 with 37" tires I am about to get. I looked at morris 4x4 and it told me like 4.27. And that doesn't make since. I looked somewhere else and I found like 5.49. I do have a 4 cyl YJ so I know I will need to gear high, I would like to be able to drive 65, does anyone know the optimum gear to run or can someone send me in the right direction please. Thanks!
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I can't not seem to find what gear ratio I need to run with my dana 44 with 37" tires I am about to get. I looked at morris 4x4 and it told me like 4.27. And that doesn't make since. I looked somewhere else and I found like 5.49. I do have a 4 cyl YJ so I know I will need to gear high, I would like to be able to drive 65, does anyone know the optimum gear to run or can someone send me in the right direction please. Thanks!
I'm going to assume you have a manual transmission
to have the ratio (speed at rpm) same as stock you can just calculate it and pick the closest one available
28'' stock tires
4.10:1 stock R&P ratio
37'' new tires
NewRPratio=(OldRPratio/stockTireSize)*newTireSize=(4.10/28)*37=5.41
not sure what the closest one is but if it's 5.49 sounds like that site had it right
you can go longer though to next size up (higher numerical ratio) but i woudn't go below as it would be a real dog.
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Unless you plan on running JK axles I think 5.13 is the highest ratio you can go.
I have 5.38 gears in my axles for my 4 banger and would have liked 5.86 alas not available for the axles I have. Swapped in a 6 speed trans also and that combo is closer to what I deem desirable
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I ran 37's for a couple years. I run 5.38's. Did pretty good, could of used a bit lower gear. But with my HP D44 front 5.38 is as low as I could go. The LP D44 can go to 5.89.
What axles are you running?
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I think I'm gonna run 5:38s. I got a Ford Bronco's Dana 44 and a Ford 9 inch(I got a good deal on em). So I'll be able run about 65 on the highway with those gears?
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I think I'm gonna run 5:38s. I got a Ford Bronco's Dana 44 and a Ford 9 inch(I got a good deal on em). So I'll be able run about 65 on the highway with those gears?
On the flat yes. Even faster. It's not gonna be a speed demon but I was able to maintain 65-70 on the flat sections without much effort. The hills will still dog you down some.
Is yours a stick or auto?
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AX5, ok so I have been trying to find a Ford 9inch 5:38, well I cant find one. The only gears I can get to match is 5:18, unless y'all know somewhere else? I can do 5:38 in the front and 5:43 in the rear.
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5.38 and 5.43 will work fine, it's less than 1% difference.
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With a Dana 44 and a Ford 9" you should be able to run 5.89's.
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With a Dana 44 and a Ford 9" you should be able to run 5.89's.
I can't find a Dana 44 5:89 anywhere for sale. Plus isn't that a lil too low for a daily driver, I mean Idk and that's why I'm asking.
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I can't find a Dana 44 5:89 anywhere for sale. Plus isn't that a lil too low for a daily driver, I mean Idk and that's why I'm asking.
Is it a low pinion (LP) or high pinion (HP) D44? The LP gears go to 5:89 and the HP stop and 5.38.
The 5.89 do sound real low but you have to keep in mind you went from a 27 inch tall tire to a 37 inch tall tire. The 5.89's might be a tad low but not by much. For street driving it will be fine. Not sure if I would want to wheel hard with that gear ratio since the pinion gear is pretty tiny at that size. So strength could be a issue.
The 5.38 and 5.43 (like Neale said) will be fine. It's close enough not to cause a problem.
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I can't find a Dana 44 5:89 anywhere for sale. Plus isn't that a lil too low for a daily driver, I mean Idk and that's why I'm asking.
just going to use the previous calculation for stock like ratio
5.89/5.41 => 9% higher rpm at the same speed, so for example if you cruise at 3000rpm with stock tires and gearing at the same speed with the 5.89 gearing and 37'' tires you'd be at 3270rpm - ultimately it depends on what you're comfortable with but this is to give you an idea of what the change would be.
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Is it a low pinion (LP) or high pinion (HP) D44? The LP gears go to 5:89 and the HP stop and 5.38.
The 5.89 do sound real low but you have to keep in mind you went from a 27 inch tall tire to a 37 inch tall tire. The 5.89's might be a tad low but not by much. For street driving it will be fine. Not sure if I would want to wheel hard with that gear ratio since the pinion gear is pretty tiny at that size. So strength could be a issue.
The 5.38 and 5.43 (like Neale said) will be fine. It's close enough not to cause a problem.
IIRC, it was a Bronco D44 so it should be a LP.
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From what I know of it's a HP. All the gears I find on rockauto.com for the year and 4x4 Dana 44 are all reverse cut.
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From what I know of it's a HP. All the gears I find on rockauto.com for the year and 4x4 Dana 44 are all reverse cut.
Look at the axle. Does the driveshaft connect above the axle tube line or below the axle tube line? Or post a PIC we can tell you.
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IIRC, it was a Bronco D44 so it should be a LP.
I thought the HP came off of the F250's. From what I understand the Bronco's did come with LP fronts. But I am no expert.
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I will go look in a min I'm on the :flush:, I am pretty sure it's a hp, I js texted the guy though and he said it is an hp.
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I am for sure it is a HP44 also found me a 5:38 for my ford 9
(http://i489.photobucket.com/albums/rr259/kmikey07/IMAG0301.jpg)
It is made by Motive
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I am for sure it is a HP44 also found me a 5:38 for my ford 9
(http://i489.photobucket.com/albums/rr259/kmikey07/IMAG0301.jpg)
It is made by Motive
is it just me or that looks like a spun bearing?
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The guy I bought from said he only used it one race I think it was a stock car race. I can always return it, so we will see.
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I am for sure it is a HP44
You had a HP44 cut down? F250's had HP44's but they were about 6" too wide. I thought you were running Early Bronco axles for some reason.
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A quick search showed that 5.38 is available for the 9" but the only ones I found were called "lightweight".
Are these different from (not as strong as) the normal R & Ps?
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A quick search showed that 5.38 is available for the 9" but the only ones I found were called "lightweight".
Are these different from (not as strong as) the normal R & Ps?
Seeing as most race cars in the US use the Ford 9", you'll find a lot of lightweights. They're thinner gears. You can see they mill out a bunch of metal from the backside of the ring gear.
(http://www.justdifferentials.com/images/Ford-9-Lightweight-Gears.gif)
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i don't think that's going to affect the strength though, they usually brake teeth, never seen a cracked ring
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You had a HP44 cut down? F250's had HP44's but they were about 6" too wide. I thought you were running Early Bronco axles for some reason.
I finally went and got a pic lol it's a 1978 Bronco axle
(http://i489.photobucket.com/albums/rr259/kmikey07/IMAG0300.jpg)
Yeah it was the ONLY sale I could find on ebay for a Ford 9 5:38.
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The only $hitty thing I just found it that those radius arm wedges are casted into the tubes, so I will either have to leave them or retube them. :brick:
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Those bronco axels should be low pinion. The one we have in our garage is. And removing the tubes proved to be a real pita (we gave up on trying to drill out the plug welds as we were geting nowhere with every type of bit we could find)
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Ah OK, that's a full-size bronco which will be HP.
Looks like your instrument panel is pretty rusted, too.