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Unread 10-08-2011, 08:41 AM   #1
Xcon0wn4g3
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1990 YJ Wrangler 
 
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Manual to automatic transmission

I decided to rebuild the ax5 transmission in my 1990 wrangler yj 4cyl 2.5l. I never thought to look for parts before I started and now I'm stuck at a dead end. The bearings I need have been discontinued and I can not find a used transmission. The one thing I would most likely be able to get is an automatic but I'm not sure what transmission from what vehicle and year would bolt up to my jeep. Does anyone know what vehicle I could get an automatic from that would work?

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Unread 10-08-2011, 09:36 AM   #2
superj
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any 2.5 liter automatic rear wheel drive jeep, would probably work.

cherokee
comanche
wrangler

maybe some dodge vehicles too, like the dakota
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Unread 10-08-2011, 10:55 AM   #3
Xcon0wn4g3
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Could I bolt my transfer case onto one of those so I still have 4 wheel drive? Would I have to buy anything to be able to install it or will it fit perfectly?
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Unread 10-08-2011, 10:58 AM   #4
RecklessXJ
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why not go ax 15 conversion? if you want a strong transmission and want a manual that would be the way to go
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Unread 10-08-2011, 11:34 AM   #5
Xcon0wn4g3
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I can get an ax15 easily but I heard it's not very easy to convert to and I will need alot of extra parts starting with a bell housing from a dakota. If I heard wrong, please tell me. I can't get the transfer case for the ax15 though(If that's needed). If I might add, have a very tight budget.
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Unread 10-08-2011, 11:42 AM   #6
superj
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As long as you keep your old trans to use for parts, I think you could use any of the 4 cylinder trans from the above vehicles. Just look them over and make sure they look similar
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Unread 10-08-2011, 11:42 AM   #7
RecklessXJ
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yea i think you would need a bell housing and new transfer case shaft with the right spline count and thats it so it might be cheaper to go with an auto or you could try to find a used ax5 forsale goodluck
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Unread 10-08-2011, 12:13 PM   #8
Hghgrad
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You don't want an auto...

I just pulled the 3spd auto/4cyl combo from my wrangler in favor of a 4.0 swap. The fastest speed I could ever manage was 55mph getting on the freeway. I could eventually get to 70mph (posted speed), but at the first overpass I would drop down to 58-60 with my foot on the floor. Riding on the normal surface streets was fine...but I have to get on the freeway once a month or so for work and I dreaded that 30 mile trip.

It was quite a horrible combo and I wouldn't suggest it to anybody. I get better gas mileage with the 4.0/ax15 than I ever did with the 2.5/auto.

Used ax5's are plentiful around here...and cheap. I'd keep looking or consider trying to piece the ax15 conversion together.
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Unread 10-08-2011, 12:25 PM   #9
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Yeah, the 3 speed auto is horrible behind the 4 cyl. I really have no clue why they included such a horrible transmission with the 2.5, you really need a 5 speed that rev limits to at least 4200rpm.
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Unread 10-08-2011, 12:38 PM   #10
SquidsYJ
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OP, If you have the ability to get the measurements for the bearing you can usually order a bearing with the right measurements.

Two good sources for bearings in the past are Timken and Boca. I have used Boca in smaller applications and have been very happy with their quality.
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Unread 10-08-2011, 12:43 PM   #11
Xcon0wn4g3
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I have the ax15 now and I'm pretty sure I can get a 96-00 dakota bell housing. The only other thing I would need to get is a 23 spline input shaft for my transfer case, correct? The model 300 extended depth shaft from here should work? http://www.novak-adapt.com/catalog/kit_153.htm Is there anything else you guys know of that I need to get this to work?
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