MJ Questions From the New Guy

[Eliminator89]

Hi guys, just found this place and now will procede to ask a lot of questions.

 

I have an '89 Comanche 4.0 and 5spd. I have heard of both, the AX15 and the Ba/10 being used in this year. Is this correct? I'm not yet sure which one I have, its never been a concern til now (the truck is 60 miles away at a friend's farm so I can't run out and check). I did, however, purchase a full set of factory service manuals for it and it contained a service manual for the AX15 so that's encouraging. My truck has a clutch slave cylinder inside the bellhousing if that helps determine what I have.

 

I have a blown engine and am planning to replace it in the next couple of weeks or so. I have found an XJ Waggy that I can get for cheap that has a good engine. I have to buy the whole truck though, so I thought I may as well use the front axle and take this opportunity to 4 wheeldrive my 2 wheeldrive truck. The Waggy has an auto tranny and I plan to keep my 5 spd. The work involved in swapping to an auto is beyond what I am willing to do at this time.

 

Will the auto Tcase fit up to my 5 spd? To mount a Tcase on my 5 spd, what do I need? Just remove the tailshaft housing? Do I need to replace the output shaft? Is there an adapter between the tranny and the Tcase? If so, are the auto and manual adapters different?

 

I also have access to a newly rebuilt 258 in the crate. Can I just install the 4.0 head and accessories on this '79 258 long block and use that in my truck?

 

Long winded first post but I have had these questions bouncing around in the vast emptyness of my head for a while now. :D

[Pete M]

 

The Peugeot case splits along the top and bottom, meaning a front-to-back seam. The AX-15 had the huge ring and the front and rear sections of the case bolt to it. You are correct, 89 was the changeover year. Unfortunately, changing the 2wd AX15 to 4wd can cost as much as a junkyard tranny after you track down all the needed parts so it may not matter what you have now. 94 or 95 was the change to an external slave.

Jeep on!

--Pete

[Eliminator89]

Info I have from another site basically says I would

be just as well off getting an AX15 with the transfercase already on it rather than trying to convert my tranny. I figured it would wind up that way.

 

Thanks.

[Eliminator89]

AX15!

 

Did a compression check on the engine today, just for grins. 10 psi on #5. Oopsy.

 

Gonna get a junkyard engine for now and build a stroker this fall or winter.

 

So many hoses and wires...........:(

[Guest]

HI

 

I have a 1988 MJ Comanche and have the AX 15. So the change over year was probably 1988.

This is a Comanche for export, for non regulated markets. Sold in Argentina.

[87manche]

Fernando,

I just read your post in the 4 Cyl thread. You most likely have an AX-5, the AX-15 was never put behind the 2.5L motor. AX-5 and AX-15 are related and look similar

http://www.jeeptech.com/trans/ax5.html

[Eagle]

HI

 

I have a 1988 MJ Comanche and have the AX 15. So the change over year was probably 1988.

This is a Comanche for export, for non regulated markets. Sold in Argentina.

1989 was the year. I have an early 1989 with the BA10/5

[Pete M]

Being an export MJ opens up a whole new world of possibilities! (no pun intended)

 

fernando, can you take any pictures of your MJ? :D I've always wanted to see an export MJ! Is it 2wd or 4wd? If you can get pictures, you can include them in the "introduce your MJ" discussion at the top of this forum.

Jeep on!

--Pete

[CWLONGSHOT]

Not to higack, BUT....:)

 

I have a 1990 AX15 from a XJ, A friend has a 88 MJ with a BA10, is my AX15 a direct swap for his BA10?

 

They are both from 4WD Jeeps two years apart.

 

As far as I know both should be 21 SPL, but not sure if the BA can just be unbolted and the AX bolted back in its place.

 

Thanks,

CW

[87manche]

I believe it is bolt in. The hose is different, if you want it to be a real clean install get the shorter clutch hose for the AX-15.

AFAIK all AX-15 trannies were 23 spline.

[Pete M]

I've heard that the very early AX-15s might be 21 spline (I've also heard that they are all 23). If I can ever find the time to dig into my new MJ, I'll know for sure.

Jeep on!

--Pete

[87manche]

http://www.novak-adapt.com/knowledge/np231.htm

Apparently there were some differences in the shaft length, which really sucks, cause now I have to research that in my AX-15 replacement. But it looks as if all the ax-15's were 23 spline.

http://www.novak-adapt.com/knowledge/ax15.htm

hopefully Novak has it together and they're not wrong.

[carnuck]

The in service replacement AX-15 that Jeep put in place of the BA 10/5 under warranty was 21 spline till '08/90.

[87manche]

The in service replacement AX-15 that Jeep put in place of the BA 10/5 under warranty was 21 spline till '08/90.

thanks for the definitive answer.

[Guest]

Sorry for the mistake. There is an AX5 in my truck. I am new at this and trying to learn. Mistakes like this help me.

Pete: the truck is an 1988 MJ - VIN 1JEYL631EJT236003, short bed, Mannual 5 speed - NP 231 2,72 : 1 - Dana 30 and 35 4,1:1 - Conditioned air - "2,5 lts with the "Carter YFA non feed back", no EGR valve, no computer, no oxygen sensor, Only has PCV and Thermostatic air cleaner. Bought it 1 year ago.

I like it very much. I only feel a little bit disapointed with the engine power. I will soon introduce it.

[Eagle]

Fernando, because your truck has a carburetor and no computer controls, it would be very easy for you to install a Jeep Stage 2 camshaft kit and a new Weber carburetor. The factory camshaft kits are still available occasionally in e-Bay, or we can get you the specifications and you can buy a similar camshaft from one of the aftermarket companies such as Crane, Crower, Iskendarian, etc.

 

It can make a big difference. There is a gentleman on the NAXJA forums who posts under a name something like "Hoss Hoffer" (if I remember correctly) who is running a factory cam kit in a 2.5L Cherokee, and he says it is very good on power, and the cam did not destroy his fuel economy.

[Guest]

Eagle: Thank you very, very much for this information and knowledge!!!!!.

Makes me happy to know I can improve power.

 

Have a look at www.jeepgladiator.com.ar. This is the most friendly club for my MJ Comanche in Argentina. But I do not get the kind of info you give me, here in Argentina.

 

Could you please send me the specifications for both camshaft and Weber carburetor?

 

Any way I will start lloking for the things on the web.

 

Fernando

[carnuck]

The 4 cyls got AX-5 or possibly SR5/T5 (only saw a couple in '84/85 XJs so far)

[Eagle]

Could you please send me the specifications for both camshaft and Weber carburetor?

I don't have specifications on the carburetor, but my friend in Greece bought it through Rusty's Off-Road in Alabama. Rusty's has a web site, and perhaps someone here has the link to it available.

 

For the camshaft: Jeep offered three performance cams for the 2.5L. They were the same grinds they also offered for the 4.0L. Of course, DaimlerChrysler has sold off their stock, but the used to show up on e-Bay sometimes. (I bought a Stage 2 from one of the guys in NAXJA. I haven't installed it yet, but I'm not planning to sell it.)

 

Stage 1: Part Number P4529656

Duration 240/240 degrees

Overlap 24 degrees

Center Line 108 degrees

Lift 430/430

 

Stage 2: Part Number P4529657

Duration 248/248 degrees

Overlap 32 degrees

Center Line 108 degrees

Lift 440/440

 

Stage 3: Part Number P4529658

Duration 256/256 degrees

Overlap 40 degrees

Center Line 108 degrees

Lift 450/450

[Cabz]

Not to Hijack the thread but if you do geta mopar cam and lifter kit , you may not want to use the lifters.

 

The reason being that almost everyone I have talked too ( and myself )

have had at least one of the lifters not want to pump up right.

 

I still have a lazy lifter in mine that I need to change.