91 ax15 swap on an 88 with a 4.2L? - JeepForum.com
Search  
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > Models > Jeep Wrangler Forums > YJ Wrangler Technical Forum > 91 ax15 swap on an 88 with a 4.2L?

6th Annual, Beat Your Wife to the Credit Card Sale!50 in light bar /A pillar mount less than 500 at JeepHut.cFS: Wrangler RGB Multicolor Fog Light LEDs: Awesome Effect

Reply
Unread 10-02-2011, 10:09 AM   #1
mekken
Registered User
1988 YJ Wrangler 
 
Join Date: Aug 2009
Location: new jersey
Posts: 47
91 ax15 swap on an 88 with a 4.2L?

I tried search and the FAQ but could not find an answer. Im junking the auto for a manual and i need some info. My jeep is an 88 4.2 automatic and the parts are coming from my 91 4.0 manual parts yj. From what I hear 91's had a different pilot bushing than 92 and up so what bushing will fit on my 4.2? i already ordered a clutch assembly for a 91 with internal slave (I'll swap to external later) but will the bushing fit? If not anyone know where i can get one?

mekken is offline   Reply With Quote Quick reply to this message
Unread 10-02-2011, 10:47 AM   #2
moonshinefuel
Registered User
1995 YJ Wrangler 
 
Join Date: Feb 2009
Location: Los Angeles. California. United States.
Posts: 4,911
Interesting question. So, depending on what flywheel you use is going to give you a better understanding of which pilot you need. Your using a 1988 flywheel? The earlier blocks have the bushings seated in the crankshaft correct?
__________________
AX5/NV3550 Conversion Thread. http://www.jeepforum.com/forum/f12/n...irrels-752742/
Bow Hunting www.bowsite.com
moonshinefuel is offline   Reply With Quote Quick reply to this message
Unread 10-02-2011, 10:57 AM   #3
moonshinefuel
Registered User
1995 YJ Wrangler 
 
Join Date: Feb 2009
Location: Los Angeles. California. United States.
Posts: 4,911
I know there are two different sized pilots for the ax15 that are possible, .590 and .750 iirc. So, determine the pilot size for the crankshaft/flywheel side, and then the size on transmission itself, which are two possibilities there. Then you have your answer it looks like on what you need. If it turns out you can't get the pilot locally, I am sure a company like advance adapters, or similar will definitely have it.
__________________
AX5/NV3550 Conversion Thread. http://www.jeepforum.com/forum/f12/n...irrels-752742/
Bow Hunting www.bowsite.com
moonshinefuel is offline   Reply With Quote Quick reply to this message
Unread 10-02-2011, 12:09 PM   #4
mekken
Registered User
1988 YJ Wrangler 
 
Join Date: Aug 2009
Location: new jersey
Posts: 47
The flywheel is from the 91 and yes the bushing was in the crank. The bushing was broke in half when i pulled the trans on the 91 though. I'm not going to take my auto trans out untill i have everything so i dont know if the 88 crank is different than the 91. I guess i should measure the shaft for now and go from there. Those would be inside mesurements right? Do you know the outside diameter of are they all the same? Thanks so much
mekken is offline   Reply With Quote Quick reply to this message
Unread 10-02-2011, 12:40 PM   #5
moonshinefuel
Registered User
1995 YJ Wrangler 
 
Join Date: Feb 2009
Location: Los Angeles. California. United States.
Posts: 4,911
I guess my thought on this is I would probably look to use a flywheel that was used on that 4.2 engine, but you know I am not sure that this is an issue or not sure on any differences between the years, as the 91 may work just fine possibly. Ill bump the thread up again here.
That particular measurement is on the end of the input shaft, or yes the inside diameter of the bushing, should be real close.
__________________
AX5/NV3550 Conversion Thread. http://www.jeepforum.com/forum/f12/n...irrels-752742/
Bow Hunting www.bowsite.com
moonshinefuel is offline   Reply With Quote Quick reply to this message
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the JeepForum.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.
Note: All free e-mails have been banned due to mis-use. (Yahoo, Gmail, Hotmail, etc.)
Don't have a non-free e-mail address? Click here for a solution: Manual Account Creation
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.


Thread Tools


Suggested Threads





Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.