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Old 08-05-2011, 09:39 AM   #1
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Transmission swap

I have an 87 with a 4.2, with a 5 speed. My question gas to do with the trans. As you might have guessed I have a BA 10/5 and it is about shot. My question is "are there any direct fit transmissions that would replace my BA 10/5"

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Old 08-05-2011, 11:22 AM   #2
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If I remember correctly, the AX15 should bolt up, not sure about clutch linkage issues though.

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Old 08-05-2011, 11:24 AM   #3
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Yeah an AX15 will bolt right up, but your gonna have to have the transfer case too. Yours has a 21 spline input and the ax15 has a 23 spline output
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Old 08-05-2011, 12:39 PM   #4
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So I can just swap out the AX 15 its tranfer case for what I have and I will be good to go. That makes life alot easier. My next question would be, "other than the Wrangler what else did the AX15 fit into?"
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Old 08-05-2011, 02:44 PM   #5
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they used the ax15 in the Cherokee.
The AX15 Transmission - Novak Conversions

you can also change the input shaft on your current t-case to the proper spline count, jb sells one at:
JB Conversions, Inc.
there are 2, one long and one short, choose wisely.


Toyota had a similar tranny built on the same basic design...
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Old 08-05-2011, 07:56 PM   #6
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The np231 came with a 21 spine input from a Cherokee and a 23 for a wrangler. The Cherokee and newer np231 from tjs?? don't have through vacuum port for the front axle....
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Old 08-07-2011, 11:47 AM   #7
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I will weigh my options and decide. I will admit that I am leaning more to replacing the shaft. Is this a big job?
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Old 08-07-2011, 12:42 PM   #8
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Quote:
Originally Posted by wmills71
I will weigh my options and decide. I will admit that I am leaning more to replacing the shaft. Is this a big job?
Gotta split open the transfer case. It's kind of a big job. Still haven't done mine yet
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Old 08-07-2011, 01:59 PM   #9
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If you're going to split the case, it would be a good idea to do a full rebuild on the t-case and drop in an SYE at the same time. It is out of the vehicle and on the bench, might as well get it all done at once.

Though you may likely find you can buy a used AX15 and t-case for a Wrangler together rather easily. I know I see them on Craigslist pretty regularly.

-Brian
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Old 08-07-2011, 02:09 PM   #10
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I made the mistake of buying them separate and it's a pain now and more of a hassle than need be
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Old 08-08-2011, 01:52 AM   #11
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Quote:
Originally Posted by Tang87 View Post
The np231 came with a 21 spine input from a Cherokee and a 23 for a wrangler. The Cherokee and newer np231 from tjs?? don't have through vacuum port for the front axle....
the 2.5L came with the 21 spline, and the 6 cylinders (AX15 and BA10) came with 23 spline. Cherokees are the same way.

My 90 YJ with 2.5L has the 21 spline, When I bought a replacment tcase from a 93 with the AX15, I was forced to replace the input shaft it had a 23 spline.

I want my old tcase repaired, the one I bought has a blown out set of low gears (just found out last week) so im pushing the wife (read "butt kissing") for her to slow down on groceries so I can get the JB ultra short SYE, shaft and electric speedo....
Should be a $700 ish repair with my labor.


Also:
450920 Diff Cable Lock Kit Jeep Wrangler YJ 3-6" | eBay

should fix your vacuum issues for the front axle.
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Old 08-08-2011, 06:32 AM   #12
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Quote:
Originally Posted by 2xs

the 2.5L came with the 21 spline, and the 6 cylinders (AX15 and BA10) came with 23 spline. Cherokees are the same way.

My 90 YJ with 2.5L has the 21 spline, When I bought a replacment tcase from a 93 with the AX15, I was forced to replace the input shaft it had a 23 spline.

I want my old tcase repaired, the one I bought has a blown out set of low gears (just found out last week) so im pushing the wife (read "butt kissing") for her to slow down on groceries so I can get the JB ultra short SYE, shaft and electric speedo....
Should be a $700 ish repair with my labor.

Also:
450920 Diff Cable Lock Kit Jeep Wrangler YJ 3-6" | eBay

should fix your vacuum issues for the front axle.
Mine is a ba10 and I'm pretty sure its 21 spine output shaft. And ill look into that cable lock. Thanks!

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