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Unread 12-03-2008, 11:30 AM   #226
atthemattin
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1987 YJ Wrangler 
 
Join Date: Feb 2008
Location: PA
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anyone know if the CJ7 tranny will hold up to the added power of the 4.5 strocker? i have been looking into building a CJ7, but it didn't say anything if the tranny would adapt. anyone know the common tranny for an 85 CJ7 or if i should replace it with a different one if i go for the 4.5 strocker? i mostly stick with the YJs, but i know the french one i have in my 87 would be replaced with an AX15 if i was going to build it.

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Unread 12-04-2008, 04:02 AM   #227
Last Boyscout
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A tranny can handle just about any engine. It all depends on how you drive it. Are you heavy on the skinny pedal? When the tires slip do you just push it harder? If the CJ hasn’t been hacked and transplanted your VIN should tell you what the tranny is. Current tranny 4 or 5 speed? If you’re looking for options go to www.novak.com and do some reading. Jeep or Ford T18 and Chevy SM465 will give you the best strength and lowest gear set.
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Unread 12-07-2008, 01:38 PM   #228
pscj5
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Is there any way to get a 3spd out of my cj5 to bolt up to this 4.0 out of 88 Cherokee
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Unread 12-07-2008, 05:27 PM   #229
Last Boyscout
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it will bolt right up. the bolt pattern on the I6 never changed.
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Unread 12-10-2008, 07:35 PM   #230
pscj5
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wiring from 88 jeep cherokee

i just got a 88 cherokee with the 4.0 its goin into my 72cj5 asap, what wires do i need to keep intact and what computer type parts do i need to pull in the process
Thanks
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Unread 12-10-2008, 09:36 PM   #231
Last Boyscout
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88 is a RENIX. don't ask me what that is or means. i just know it's different from OBDI (91-95) and OBDII (96-99 & 00-06). go to www.cjoffroad.com and in the 4.0 Swap forum search Renix. from what i recall it's very similar to the OBDI but sensors are in different location.
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Unread 12-11-2008, 08:48 PM   #232
bummpyjojo
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help me decide

Alright I just totaled my 95 wrangler sahara well the frame got broke so the insurance totaled it. It still runs and drives great. So I took the nice fat check and went out and found a 92 jeep wrangler that was in perfect condition no rust at all the frame still has factory paint on it. Now someone put a 1975 258 in it with a 2bb computer carb. So heres my options

#1 pull carb off and put a weber 32/34 carb and a HEI distributor on it with possable a msd 6 unit and call it done.

#2 do i take both jeeps to a shope and have them do a full engine swap. (both engines are rebuilt.)

#3 do i take both engines to a shop and have them do the 4.0 head swap with the fuel injection as well.

#4 fix the 95 wrangler (about $800) and sell it off, was offered $1800 as is but could get $3500 fixed up easily.

I like option 3 for the power and fuel mpg I was getting 21mpg in the 95 and only 15mpg in the 92. I only have about a $1,000. to spent and am worried about what a shop would charge or if i should truct them. I really dont have time to do this myself and its really cold here in western ny

any help on this and between the two jeeps do i have everything needed or will i need to buy much more.

Thanks
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Unread 12-16-2008, 07:59 AM   #233
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What do you use your YJ for? Is it just a daily driver? If it’s only for the street and snow go with the option for the best mileage and road manors. With your situation there are too many options. What axles and tranny do both jeeps have? Is the gearing in both the YJs axles the same? Some of your good mileage on the 95 could be due to the gearing in the axles and tranny. I would talk with a few shops since you don’t plan on doing it yourself. A head swap or after market FI might be the most affordable option. But, the only way to get the same mileage you had before is a full drive train swap (engine, tranny, t-case, and axles.) The swap would be simple for a mechanically minded person. All the components are made for the same body style vehicle. But, that in no way means it would be affordable for a shop to do for you.

If you have any question about my question just ask. We’ll help.
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Unread 12-20-2008, 07:34 PM   #234
bummpyjojo
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Well i decided to forgo the head swap and went with a carter carb comming on the 23th. The axles are the same except the new jep has a posi in it. I have a 4" lift kit waiting for a sunny day (yea over a foot of snow) I also just got a mallory ignition after doing the tfi conversion. I'm at 15mpg now and am hopeing to gain 2 mpg. After taping into the o2 i'm running real rich, but new carb will help. I do daily driveing and only trail off roading. I would love to get back into off roading with this one. But i did come to find out my old jeep wasnt totaled so i now have two jeeps to fix although still probaly just selling the old one.
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Unread 01-08-2009, 02:38 PM   #235
Stan99
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Just one quik question. I have done alot of reserch on what I have. The question I have is do I have to run the 4.0 starter if I am running a AX15? I have found conflicting answers on this. Before I put it in I matched up the flywheel from my TH400 and the ax15 one and there was no difference. My starter for the TH400 is brand new. Do I need to replace it?

My set up......

258, 4.0 head, intake and manifold, ax15 tranny, clutch and flywheel
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Unread 01-08-2009, 03:04 PM   #236
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The way I under stand it is you have to run the starter that matches the flywheel you are using. And why would you replace a TH400 with an AX15?
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Unread 01-08-2009, 05:20 PM   #237
Stan99
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The TH400 was had a big whole in the side. And I wanted to go with a stick on the rebuild so I found this one and was an easy swap with the dana 300. I also picked up an sm420 but after driving a buddys jeep with it, it went straight to the shed.

Do you know if there is a difference between the two flywheels?
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Unread 01-09-2009, 04:04 PM   #238
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There is a huge difference between the TH400 and AX15. The TH400 is an automatic and uses a flex-plate. The AX15 is a manual and uses a fly-wheel. A flex-plate and fly-wheel are not interchangeable. They shouldn't even look alike. I'm a little confused.
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Unread 01-09-2009, 04:19 PM   #239
Stan99
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I am talking about the difference in the tooth pattern. I know the differences in everything else. But when I put the two up to each other (flex plate/flywheel)the pattern looked exactly the same.

I gues I am stuck getting a new starter. Anybody need a new CJ7 starter?
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Unread 01-09-2009, 05:54 PM   #240
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you can use a CJ fly-wheel w/ the AX15. The starter has to match the Fly-wheel not the Tranny. You can try the AX15 fly-wheel w/the starter but be ready to take it apart if it does not engage. I would contact NOVAK w/ this question. They are the authority on Jeep Tranny conversions.
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