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G2 Disc Brake Conversion Kit for Jeep Wrangler YJ TJ LJ ChSPARTAN LOCKERS are on sale BIG TIME at ROCKRIDGE 4WD!ZONE 4.25" combo lift for TJ available at Rockridge4w

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Unread 04-13-2013, 11:55 AM   #1
wb3eim
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1951 CJ3A 
 
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CJ2A build

Building a 2a and want it to be able to keep up at highway speeds. Swapping out the 4cylinder for the Dauntless v6 and T86 trans. Any ideas on axles and there gear ratios? Thanks

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Unread 04-13-2013, 07:08 PM   #2
Jim1611
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Welcome to the forum. You want to change to another type axle?
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Unread 04-14-2013, 10:49 AM   #3
wb3eim
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I have the Dane 25 and 44 axles with 5.38 gears. I was thinking about late 70s axles from a CJ5 or 7 with disc brakes. Would they work and what gear ratio would be good 4.11 or 3.73? thanks, Stan
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Unread 04-14-2013, 04:25 PM   #4
Jim1611
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Quote:
Originally Posted by wb3eim View Post
I have the Dane 25 and 44 axles with 5.38 gears. I was thinking about late 70s axles from a CJ5 or 7 with disc brakes. Would they work and what gear ratio would be good 4.11 or 3.73? thanks, Stan
Anything can be made to work if you're willing to put the time into it. Most any axle you go with will likely be wider. Tire size is a big factor in gear ratios. What size are you planning on using?
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Unread 04-15-2013, 06:33 AM   #5
wb3eim
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I have 15 inch rims and tires I will be using. Would changing the gear ratio in the stock axles help?
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Unread 04-15-2013, 11:46 AM   #6
CherryCj7
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Quote:
Originally Posted by wb3eim View Post
I have 15 inch rims and tires I will be using. Would changing the gear ratio in the stock axles help?
We need the diameter of the actual tire not the rim.
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Unread 04-15-2013, 12:10 PM   #7
CSP
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If you go to late 70s axles the rear one will need to come out of a Quadratrac equipped CJ7 to have the passenger side offset of the diff to match the rear output of your Dana 18 transfer case.

The gears could be changed in the stock axles. Ratios are the same regardless of the axle it's in (a 4.10 in a Dana 25 is the same ratio as a 4.10 in a Dana 30).
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Unread 04-15-2013, 12:28 PM   #8
Rattyflatty
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I think the cheapest and easiest way to to get this done with decent results would be to find:

30/44 from a 72-75 CJ5/6
common to have 3.73 ratio in them
spring pads are the correct to swap into yours
your tie rod system can be made to work with these
You will have to upgrade your brake master cyl to run the larger drums found on these. And run a Dana 20 T-case behind the T86.
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Unread 04-15-2013, 05:16 PM   #9
wb3eim
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Thanks for the suggestions. Guess I'll start looking for the Dana 30/44 axles with the 3.73 ratios. Already have a Dana 20 t case. Again thanks all and let the build begin.
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Unread 06-24-2013, 08:54 AM   #10
wb3eim
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A few more questions:
1) Thinking about moving the fuel tank to inside the rear frame rails. Is there a tank that will fit? Any threads showing it?
2)Putting in the Dauntless V6. Any suggestions for a radiator? Electric fan?
3)Will a T90 bolt to a Dana 20 T-case?
Thanks!!
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Unread 06-24-2013, 11:38 AM   #11
hotrod351
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get a warn overdrive. i have 5:38 and 33" tires, 350 sbc, and can do 80 mph in overdrive. in almost 20 years ive only broken two axles, one front and one back, and that was doing something really stupid. and yes ive done a lot of hard core off road four wheeling with it. handles the highway great, cruise at 55 - 60 mph at about 2200 rpm.
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Unread 06-24-2013, 02:04 PM   #12
Rollbar
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Quote:
Originally Posted by hotrod351 View Post
get a warn overdrive. i have 5:38 and 33" tires, 350 sbc, and can do 80 mph in overdrive. in almost 20 years ive only broken two axles, one front and one back, and that was doing something really stupid. and yes ive done a lot of hard core off road four wheeling with it. handles the highway great, cruise at 55 - 60 mph at about 2200 rpm.
I'm in the process of getting a SBC for my '48 build as well.

What rad are you running? What overdrive are you speaking of? Does it bolt to the tail section or ?

I'm will be running a T-98/T-18.

Part numbers?

Thanks,
Jim
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Unread 06-24-2013, 02:14 PM   #13
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You would have to cut out the K-member to fit a fuel tank between the rails. Any mid-70-75 tank would fit there.
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Unread 06-24-2013, 04:00 PM   #14
hotrod351
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i have the warn overdrive, think there called saturn overdrive today. they bolt to the transfer case, pretty easy install. they go on where the plate cover is on the back of the transfer case next to the rear drive shaft. i think my radiator is for a cj7, its a 4 row. you can see part of it in this pic.
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Unread 06-24-2013, 04:31 PM   #15
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Lots of Warn/Saturn o/d info can be found here: http://hermtheoverdriveguy.com/
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