Swapping Out Ring & Pinion

stwilegar

stwilegar

Member
1972 Scout ii
345
TF727

Hey y'all. Im in the process of making my Scout a daily driver. To that end I plan to swap out my 3.73 for 3.07s. Im ok with giving up low end for being able to run the highways without running 3000 RPM.
Ive read that my 72 has a Dana 30 fro t and Dana 44 Rearend. Before I go out and buy near Ring and Pinion Od like to be sure. The rear pumpkin has a tag that reads "41-1 3.73". Afterooking that up it said something about a Dana 41. Can someone educate me on the meaning of the tag.
Also, Id love some recommendations on where and how to go about acquiring said equipment.

Thanks In Advance.

Bridger
North Idaho
 

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easier to identify it by the diff cover... that cant be changed or faked or misrepresented



dana 30 on the left dana 44 on the right
s-l1600.jpg
J21220.jpg
 
stwilegar said:
1972 Scout ii
345
TF727

Hey y'all. Im in the process of making my Scout a daily driver. To that end I plan to swap out my 3.73 for 3.07s. Im ok with giving up low end for being able to run the highways without running 3000 RPM.
Ive read that my 72 has a Dana 30 fro t and Dana 44 Rearend. Before I go out and buy near Ring and Pinion Od like to be sure. The rear pumpkin has a tag that reads "41-1 3.73". Afterooking that up it said something about a Dana 41. Can someone educate me on the meaning of the tag.
Also, Id love some recommendations on where and how to go about acquiring said equipment.

Thanks In Advance.

Bridger
North Idaho
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The picture of the tag you posted is clearly not on an axle but the transfer case, which is a Dana 20. Regardless, all Scout II's from 1971 to 1980 had a Dana 44 rear axle in it, so unless someone has swapped your factory axle out for something else, then it will have a Dana 44.
 
What tire size are you running? You'll be fine with the taller gears on the pavement, but if you plan on doing much off roading, that's where you'll miss the lower gearing the most, especially with the auto trans.
 
ihpartsjeff said:
The picture of the tag you posted is clearly not on an axle but the transfer case, which is a Dana 20. Regardless, all Scout II's from 1971 to 1980 had a Dana 44 rear axle in it, so unless someone has swapped your factory axle out for something else, then it will have a Dana 44.
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You are correct. I uploaded the wrong photo. I'll need to change the front axle too. Do you know for sure if they were Dana 30?
 
This is front and back. Based on what ya'll said, it appears I've got Dana 40 Back and original Dana 30 on Front.
 

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From my vantage point, that's a D30 FA. The shapes of the two covers are not the same. The front axle cover is more of a uniform oval, while the shape of the rear cover is not a uniform oval.

Edit...yes. I didn't quite read your post correctly. We agree, accept your rear is a D44.
 
Bigger tires do the same thing as a gear change...

Do you have a dial indicator, set up bearings Or clam shell bearing puller, and bearing press?

Gear swaps are not "easy" and need specialized equipment.
 
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Winchested said:
Bigger tires do the same thing as a gear change...

Do you have a dial indicator, set up bearings Or clam shell bearing puller, and bearing press?

Gear swaps are not "easy" and need specialized equipment.
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You're not kidding. I started looking into this and anmbaondoned the idea completely. Im currently running a rough country 4" lift with 31" tires. According to my math id need 36" tires to get the RPM down to around 2200 or so.
 
stwilegar said:
You're not kidding. I started looking into this and anmbaondoned the idea completely. Im currently running a rough country 4" lift with 31" tires. According to my math id need 36" tires to get the RPM down to around 2200 or so.
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Conisdering 31's were the stock size tire, you've got plenty of room with 4" of lift now for 33's. I ran 35's with 3.73.s and it was fantastic.

It's an old rig a few hundred rpm isn't going to make it much quieter.

Does yours have a solid fan hub or a Clutch fan. A clutch fan will take tons of high rpm noise away.
 
I put an electric fan on mine and it seems to work OK.

I believe I'll be shopping for 35.5 or 36 inch tires. Unfortunately, i may have to replace the 15" rims as well.

Thanks for the ideas
 
You'll encounter clearance issues with tires in that size range. That's a lot of meat for a Dana 30 axle too. Whatever you go with, narrow is better.
 
There’s no realistic way 35"or 36" tires will fit in an SUA setup using any off-the-shelf lift kit. Larger tires also add significant rotating mass, which needs to be accounted for your 50 year old tired engine. Gear it appropriately for the tire size, and if you don’t have the experience or tools to do it correctly, take it to a reputable gear and drivetrain shop.
 
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