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hughesa57 06-23-2011 06:02 AM

88 jeep wrangler questions
Hey guys, thanks for having me! I have a few quick tyranny questions on my jeep, first the back story.

1988 jeep wrangler 4.2 258

It currently has a manual 4 speed with over drive, im not sure which specifically.

I want to switch to an automatic
Which tranny do I need to make it happen? Do I have to replace the T.C. as well?

Or lets say we we stay with an manual,

Will the ax-15 fit my 4.2? Everything I have found so far says just the 4.0?

I am planning to replace the tranny soon,

4Jeepn 06-23-2011 06:25 AM

What trans does it have now? 4 speed does not sound right? in 88 for the 4.2 would have been left over BA-10 5 spd or newer AX-15 5spd. Novack and advance adapters can help you out on the the parts you would need. T-case should be np231, unless you have the carry over np205(?). Might have to change input gear.

hughesa57 06-23-2011 08:03 AM

First off, yes 5 speed, sorry!
Are there markings on the tranny that will tell me which tranny it is?
Also I want to change to an exterior slave cylinder, is the ax the best to do that with?

4Jeepn 06-23-2011 06:08 PM

Here is a link to a BA-10:
Peuget BA10 Manual / Standard Transmission Parts and Diagram

For ax-15 external slave 1994 and up as i recall.. ax-15 is good trans, not sure what all is needed for swap though.

hughesa57 06-23-2011 08:55 PM

Awesome. Thanks a bunch.

blkrubi88 06-24-2011 03:48 AM


hughesa57 06-24-2011 03:28 PM

I have the BA-10. So I guess ill switch to the ax-15 if I want a manual, any suggestions for a tranny If I decide to go with an auto?

Ibuildembig 06-24-2011 03:31 PM

If you swap to an AX-15 you will have to get a 23 spline input transfer case too as the case you have now is a 21 spline. If you want to swap to auto you need a 904...where you located? I have one with a case on it read to go.

hughesa57 06-24-2011 03:43 PM

I'm in las Vegas Nv. You?

Ibuildembig 06-24-2011 03:44 PM

a long way from that lol....southeast missouri

hughesa57 06-24-2011 03:51 PM

How much you lookin for?

Ibuildembig 06-24-2011 03:54 PM

for both Id take 600, came from running 89 with 125K on it

hughesa57 06-24-2011 04:07 PM

How's it run on the freeway? I do mostly daily driver type street driving, but the weekend trips into the dirt sometimes require 100-200 mile trips. Would the 904 be the best option?

hughesa57 06-24-2011 08:50 PM

How far are you from st. Charles Missouri ?

Ageless Stranger 06-24-2011 11:06 PM

Welcome. :cool:

Ibuildembig 06-25-2011 09:50 PM


Originally Posted by hughesa57 (Post 1329950)
How far are you from st. Charles Missouri ?

About 100 miles or so

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