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Old August 19th, 2013, 08:32 PM   #1
Carbon
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Axles+tires=gears

I have a front Dana 44 and a rear corp 14 bolt out of a 79 3/4 gmc that I installed under my 76 Scout II with a 345 v8. Currently I have 4.10 gears. My plan is to run 40's and would like to regear to 5.13 or 5.71. My question is, will both axles accept this size gear set?
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Old August 19th, 2013, 08:35 PM   #2
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I believe 5.38 is as deep as the 14b gets.
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Old August 19th, 2013, 08:39 PM   #3
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Will that be enough? This will be off road only. Trails, climbing and maybe some mud.
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Old August 27th, 2013, 04:50 PM   #4
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Will that be enough? This will be off road only. Trails, climbing and maybe some mud.
What was your previous tire size?

For instance if you had a 35"'s with 4.10 gears and step up to 5.38 that's a increase in torque of 1.312. The tire size going up to 40's will reduce your torque by .875 giving you an increase in torque of 0.43%. So the feel should be similar as with the 35" tires. Now, If you had smaller then 35" tires before then you would feel a loss in torque.
That's just round wheel numbers not figuring in traction, a different rim, tire weight, or anything else you may gain or loose by going with the larger tire size.

If you were smaller then 35" before going with a higher reduction in the transfer case will give you more torque.
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Old August 27th, 2013, 04:56 PM   #5
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I thought Dana 44 could only go to 4:88?
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Old August 27th, 2013, 05:09 PM   #6
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I Have 5.38 In My Dana44.
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Old August 27th, 2013, 05:10 PM   #7
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I thought Dana 44 could only go to 4:88?
no, can go to 5.88.

5.71 gears I don't think are available for either.
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Old August 27th, 2013, 08:17 PM   #8
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i believe 5.38 is as deep as the 14b gets.
x2
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Old August 27th, 2013, 10:51 PM   #9
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Building the truck from the ground up more or less. I have 38" rollers on it now. Want to go 40's due to the huge 14b hanging low. I don't have the need or desire to go bigger then 40's so I'm looking for the right gear ratio for what I want.
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Old August 27th, 2013, 10:52 PM   #10
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So 5.38 is what I'm looking at?
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Old August 27th, 2013, 10:57 PM   #11
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So 5.38 is what I'm looking at?
It's your deepest option
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Old August 27th, 2013, 11:33 PM   #12
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Quote:
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Building the truck from the ground up more or less. I have 38" rollers on it now. Want to go 40's due to the huge 14b hanging low. I don't have the need or desire to go bigger then 40's so I'm looking for the right gear ratio for what I want.
Shave it, that would be an easier option.
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Old August 28th, 2013, 05:03 AM   #13
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Thought about that. Still need to do some research on how much to grind and how strong the housing will still be.
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Old August 28th, 2013, 06:28 AM   #14
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5.38 will be fine. 5.13 or 5.38 is what most of the guys with 6 cylinders are running with great success. I'm running 4.88 but have more motor than some. Don't forget your transfer case ratio plays into this also. What do you have?
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Old August 28th, 2013, 06:57 AM   #15
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Transfer case should be Dana 20 with about 2:1 ratio. You can get the tera-low kit for about $1000.

What transmission do you have?
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Old August 28th, 2013, 07:04 AM   #16
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Thought about that. Still need to do some research on how much to grind and how strong the housing will still be.
Look at any of the 14 bolt shave kits on the market. Most are priced fairly reasonably, and if you know someone with access to a lathe, your ring gear is easily shaved to match...
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Old August 28th, 2013, 09:56 AM   #17
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Yes the tcase is a Dana 20. I have not identified the transmission yet. I have a stock IH 345 under the hood. I will look into the shave kits. I also have access to a lathe.
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Old August 28th, 2013, 10:00 AM   #18
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Shave it, that would be an easier option.
So your saying shave it, stick with 38's and 4.10s?
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Old August 28th, 2013, 10:10 AM   #19
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No, shave it and go to a 5.13. 4.10 is too high of a gear for a 38 or 40" tire.
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Old August 28th, 2013, 10:17 AM   #20
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Quote:
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So your saying shave it, stick with 38's and 4.10s?
I run 38.5 monster mudders w/ 4.10's right now. I ran the last mud run in 4h, should have been in 4L. Didn't rev up past 3500 the whole time. I just picked up a set of 5.13's. So we'll see what happens!
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