International Full Size Jeep Association

International Full Size Jeep Association (http://www.ifsja.org/forums/vb/index.php)
-   General FSJ Discussion (http://www.ifsja.org/forums/vb/forumdisplay.php?f=11)
-   -   258 and an OD trans - Is it possible? (http://www.ifsja.org/forums/vb/showthread.php?t=134211)

Tigger4X 01-22-2011 10:56 AM

258 and an OD trans - Is it possible?
 
I'd rather have a 5 speed myself, but this bugger is gonna be for a friend of mine who is currently living in Misery (MO). Is there an overdrive auto trans that will bolt up to the 258 without any real fuss? And if so what t-case will run behind it? Of course its on a budget so I'm trying to steer away from adapters at all cost unless they are budget or cheaper than another route to get the final desired powertrain. I tried the search feature on here but 3 character search terms no workie! :rolleyes: Thanks in advance all! :thumbsup:



EDIT : Once its all figured out I'm gonna be looking for the items needed to convert it over so please keep me in mind for what you got taking up space. ;)

CJ the noisemaker 01-22-2011 11:18 AM

My vote would be the AW4 since it is a native to the I6 engines, and plentiful; However, you would need gears lower than 3.73, the wiring for the tranny, an adapter for the tranny to the TC or a slip yoke eliminator if you use the standard case, and the AW4 flexplate.

I've been told this before, so you'll get the same response. :)

addicted 01-22-2011 11:32 AM

AW4 from an XJ is the only OD that will bolt up without any adapters but will need a few extra things hooked up to run it without some sort of driver operated controller. They are electrically operated and pretty simple to figure out.

Gambler68 01-22-2011 11:37 AM

Since it's the same bellhousing as a 360, with a Novak or AA adaptor, any OD trans that bolts to those will work on a 258. They have one for a 700R4 IIRC.

1983 j10 01-22-2011 11:37 AM

yep aw4 would be the way to go they are strong trans i have an xj with it and put it thourgh a lot with out any trouple and you can run different gears my stock xj has 3.55's in it and i know other people that are running 4.10's and 35's with out any issues from it.

addicted 01-22-2011 11:37 AM

Quote:

Originally Posted by CJ the noisemaker
My vote would be the AW4 since it is a native to the I6 engines, and plentiful; However, you would need gears lower than 3.73, the wiring for the tranny, an adapter for the tranny to the TC or a slip yoke eliminator if you use the standard case, and the AW4 flexplate.

I've been told this before, so you'll get the same response. :)


3.54 gears will work fine as will 3.07's but it will be a bit of a dog with the 3.07's. Both gears were used in the XJ's 3.55's are what i've seen most often. You can also use the 231 or 242 in it's stock form as long as there is no lift associated with the truck. I am running an AW4 with a 208 and I had to use a spacer to make it work. You will also need new drive shafts either way along with crossmember work, as the AW4 is rather long.

Ristow 01-22-2011 12:05 PM

Quote:

AW4 from an XJ is the only OD that will bolt up without any adapters

don't forget the A500 was also used behind the 4.0.

addicted 01-22-2011 12:16 PM

Quote:

Originally Posted by Ristow
don't forget the A500 was also used behind the 4.0.


Yes Ristow, you are right yet again. :rolleyes:

That's the trans used in the Grand Cherokees. The AW4 has a much better reputation. Although the one in my '04 WJ has almost 200K on it and the only issue it ever had was a sticky solenoid around 65K.

AMC-J/20 01-22-2011 12:19 PM

Quote:

Originally Posted by Tigger4X
I'd rather have a 5 speed myself, but this bugger is gonna be for a friend of mine who is currently living in Misery (MO). Is there an overdrive auto trans that will bolt up to the 258 without any real fuss? And if so what t-case will run behind it? Of course its on a budget so I'm trying to steer away from adapters unless they are budget or cheaper than another route to get the final desired powertrain. I tried the search feature on here but 3 character search terms no workie! :rolleyes: Thanks in advance all! :thumbsup:



EDIT : Once its all figured out I'm gonna be looking for the items needed to convert it over so please keep me in mind for what you got taking up space. ;)


Jeep used a 258/T5 combo, the MJ/XJ AW-4 should also mate right up.
Anyhting the 242/4.0L mated to so will the 258 and 290-401 V8s for that matter.

T-5 / AX-15 / NV3550 / AW-4 / ???? Don't recall the other A/T-OD . . .

Mike

CJ the noisemaker 01-22-2011 12:47 PM

Quote:

Originally Posted by AMC-J/20
Jeep used a 258/T5 combo, the MJ/XJ AW-4 should also mate right up.
Anyhting the 242/4.0L mated to so will the 258 and 290-401 V8s for that matter.

T-5 / AX-15 / NV3550 / AW-4 / ???? Don't recall the other A/T-OD . . .

Mike

Has anybody mated an AW4 to a 304?

AMC-J/20 01-22-2011 01:23 PM

Not sure but I would figure so it'll bolt together anyway, Tho I am told some AMC-V8s require a larger pilot hole in the end of the crank shaft.

AW-4 holds up to 4.0 & 4.6-5.0 I6 strokers, So I would imagine it would do well behind the 304.
Mike

AMC-J/20 01-22-2011 01:47 PM

87'-01' 242/4.0L I6 = 177-195hp & 220-235tq in net power.

So given the 304s 150hp & 225tq or the 258s 150hp & 240tq I would say the AW-4 would hold up fine between either power plant.

I'd say judging by the power numbers it should hold up just fine.
Mike

comanchemty 01-22-2011 02:31 PM

A performance trans builder near me claims that the aw-4 can hold up to 600 lbs of torque if built right. He said the TC must be replaced.

Stuka 01-22-2011 03:05 PM

The problem with the AW4 is that it is electronically controlled from the engine ECU. I am not sure if you could run one on a carbed 258. If you swap in the 4.0 that is connected to it, then you are fine.

But with that said, my Wife's '89 XJ has 173k miles on the original 4.0/AW4, and it still shifts and drives well.

1983 j10 01-22-2011 03:30 PM

it reads some from the ecu but for the most part it has its own ecu and i know a few people that swapped aw4's in to cj's and just used the trans ecu. (i know because i sold them the trans ecu's)

pineymike 01-22-2011 05:55 PM

Why not?
 
How about an aw4/4.0 head swap,with an XJ as a donor with everything needed shouldn't be cost prohibitive?:drivin:

addicted 01-22-2011 06:08 PM

Thinking about it more. Swapping in a 42RH from an early 4.0 powered ZJ would probably be pretty easy. They had very few electronics and are basically an OD version of a 904/999. Thats if the 42RH was used in the ZJ's and not the 42RE from the start.

Quote:

Originally Posted by pineymike
How about an aw4/4.0 head swap,with an XJ as a donor with everything needed shouldn't be cost prohibitive?:drivin:


That would basically be the same as swapping in a whole 4.0. Only more work.

Eaglefreek 01-22-2011 06:22 PM

The AW4 Will bolt to the 258. You will need the 4.0 flexplate, torque converter, starter, shifter and TCU. The TCU (Transmission Control Unit) is separate an will require some wiring and a TPS (Throttle Position Sensor) mounted to the carb. Like mentioned in previous posts, you will need to figure out what transfer case you want to use and lengthen and shorten driveshafts. I recently went through this conundrum with my AMC Eagle when the transmission recently went out. It's my daily driver and gets 16-17 mpg and would love to save a couple bucks on gas. My decision was the extra cost would take quite some time to recoup and not worth the extra effort. Instead I'm looking for a cheap pile of crap 4 cyl. for running into town.

jaber 01-22-2011 07:03 PM

Quote:

Originally Posted by CJ the noisemaker
Has anybody mated an AW4 to a 304?


One of the NE guys was talking about a friend that did just this in a Javalin.
Wanna say it was Greg, but not sure..

68J2000 01-22-2011 09:15 PM

The only problem you might run into with the AW4 is what transfer-case to use, you cant use the NP242 or the NP231 because the front drive-shaft drop is on the driver side unlike yours which is passenger side. I think if you use a post-93 AW-4 you can mate it up to the Dana-300, but don't take my word on that I can't fully remember. Aside from that it's an excellent transmission and will hold up just fine behind the 258. Best of luck to you on whatever you use.


All times are GMT -6. The time now is 09:28 PM.

Powered by vBulletin Version 3.5.4
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.