4bangerjp.com

General Forums => The Mess Hall => Topic started by: kenny kustom on September 30, 2007, 05:47:52 PM

Title: Want an auto
Post by: kenny kustom on September 30, 2007, 05:47:52 PM
I want to put an auto in my rig. Which auto do i need and what else to i need besides the tranny ?
Title: Re: Want an auto
Post by: dexetr30 on September 30, 2007, 06:17:46 PM
You could go with the 30RH but an AW4 would more than likely be the best choice. As for what else is needed... :confused: I've never done a trans swap I can't give you any advice on parts and whatnot.
Title: Re: Want an auto
Post by: aw12345 on September 30, 2007, 09:29:22 PM
read old jeep's thread under meber projects
Title: Re: Want an auto
Post by: oldjeep on October 01, 2007, 05:08:42 AM
Putting in a stock A904 is pretty easy.  You need the transmission, flexplate, and a 23 spline NP231.   If your radiator does not have a trans cooler in it then you'll either need an external cooler or a radiator with an internal cooler.  Might need to modify driveshaft lengths as well.

Doing the AW4 in a 2.5 YJ is more complicated and the parts are harder to find.
Title: Re: Want an auto
Post by: oldjeep on October 01, 2007, 05:23:14 AM
AW4 Swap parts

1) You need an AW4 - make sure you get an 87-95  anything newer than that gets a little more complex
2) You need to get a bellhousing from an 87-89 2.5L Cherokee with AW4, or you can get one from an isuzu amigo, trooper with the 3.?? v6
3) AW4's come in both 21 and 23 spline  if you get a 91 -95 then you need a 23 spline transfercase
4) 2.5L AW4 torque convertor - they are a pain to find
5) flexplate from whatever year jeep you have - that will need to be redrilled for the AW4 torque convertor
6) TCU for 2.5L - these have different shift points than the 4.0L
7) Driveshafts will need to be modified - front one lengthened, back one shortened about 1.5"
8) Wiring harness for the AW4 - pull one from a cherokee that is the same year as your YJ

If you need more detail than that let me know
Title: Re: Want an auto
Post by: lax22 on October 01, 2007, 08:52:32 AM
I want to do this swap to, ho wwould you rate the A904 as far as reliability goes. I was going to do the AW4 but i dont have a whole lotta money to piece together the parts. Also will modifications to the cross member need to be made as well, ease of install is importaint. I already have an auto radiator so i guess i can cross that off the list. ::)
Title: Re: Want an auto
Post by: oldjeep on October 01, 2007, 09:09:16 AM
904 is a pretty beefy tranny, they used some versions of it behind big block chryslers.   The holes should already be in your skid plate to mount the TF904 to.  Just make sure that when you get the 904 that you get whatever bracket mounts between the tranny and tranny mount.

I swapped one into a 2.5L Comanche a few years ago and it was pretty quick and easy.
Title: Re: Want an auto
Post by: kenny kustom on October 01, 2007, 06:13:34 PM
Sounds great ! I would like to stay away from the aw4, because of the computer and having to do the 1-2 shift bypass to make it useable offroad.
Title: Re: Want an auto
Post by: oldjeep on October 01, 2007, 07:11:17 PM
Sounds great ! I would like to stay away from the aw4, because of the computer and having to do the 1-2 shift bypass to make it useable offroad.

Or you can forget about the TCU completely and go full manual shifting - www.awshifting.com  which is what I've got on mine.
Title: Re: Want an auto
Post by: kenny kustom on October 02, 2007, 07:20:40 PM
So you have no computer for the tranny at all ? You have to push the buttons to shift all the time ?
Title: Re: Want an auto
Post by: oldjeep on October 03, 2007, 07:10:12 AM
So you have no computer for the tranny at all ? You have to push the buttons to shift all the time ?

Yes, although I do have it wired for a computer.  I found that with the limited power band of the 2.5L that I prefered deciding where the shifts should be.
Title: Re: Want an auto
Post by: oldjeep on October 03, 2007, 07:11:31 AM
So you have no computer for the tranny at all ? You have to push the buttons to shift all the time ?

Yes, although I do have it wired for a computer.  I found that with the limited power band of the 2.5L that I prefered deciding where the shifts should be.

It's also worth noting that the jeep is not my daily driver, it's just a toy for offroading and occasionally taking to work when the weather is nice.
Title: Re: Want an auto
Post by: lax22 on October 03, 2007, 08:19:34 AM
So what yeat xj should i be looking for if i want to swap in a A904. 84-86 2.5l's correct? :confused: Also is there alot of difference between the A904 and the 30RH which was also used in wrangler and xj 2.5l's? Just trying to get a starting point.
Title: Re: Want an auto
Post by: oldjeep on October 03, 2007, 08:47:41 AM
So what yeat xj should i be looking for if i want to swap in a A904. 84-86 2.5l's correct? :confused: Also is there alot of difference between the A904 and the 30RH which was also used in wrangler and xj 2.5l's? Just trying to get a starting point.

If you want a A904 then get one out of a wrangler, it'll be easier.  www.car-part.com  is a decent place to start.  A904 = 30RH   A904 is the torqueflite name, 30RH is the Chrysler name
Title: Re: Want an auto
Post by: Jeffy on October 03, 2007, 01:09:48 PM
Get a 30RH.  Like oldjeep said, it's the same transmission, just a different name for it.  Newer is better.
Title: Re: Want an auto
Post by: dexetr30 on October 03, 2007, 02:11:08 PM
Yes, although I do have it wired for a computer.  I found that with the limited power band of the 2.5L that I prefered deciding where the shifts should be.

Can I mod the 3spd in my tj to do this?

Title: Re: Want an auto
Post by: Jeffy on October 03, 2007, 02:46:21 PM
Yes, although I do have it wired for a computer.  I found that with the limited power band of the 2.5L that I prefered deciding where the shifts should be.

Can I mod the 3spd in my tj to do this?



I don't believe anyone makes a manual shift body for the TF904/30RH.  I think I looked it up for someone before.
Title: Re: Want an auto
Post by: oldjeep on October 03, 2007, 04:11:52 PM
As far as doing what I did with my AW4 - no, because there's no computer in a 904.

You would have to check with the manuafacturer to be sure, but there are a lot of 904 full manual valve bodies.  the TF904 is a common transmission used in drag cars and shares a lot of parts in common with the tf727

Here's one that might work, but I'd check with the manufacturer for an application list.
http://www.compperformancegroupstores.com/store/merchant.mvc?Screen=PROD&Store_Code=TC&Product_Code=121700
Title: Re: Want an auto
Post by: dexetr30 on October 03, 2007, 04:40:00 PM

I don't believe anyone makes a manual shift body for the TF904/30RH.  I think I looked it up for someone before.

Thanks Jeffy. It was probably me you looked it up for. Damn short term memory. :brick:

Quote from: oldjeep
As far as doing what I did with my AW4 - no, because there's no computer in a 904.

You would have to check with the manuafacturer to be sure, but there are a lot of 904 full manual valve bodies.  the TF904 is a common transmission used in drag cars and shares a lot of parts in common with the tf727

Here's one that might work, but I'd check with the manufacturer for an application list.
http://www.compperformancegroupstores.com/store/merchant.mvc?Screen=PROD&Store_Code=TC&Product_Code=121700

I'll have a look at the link you provided. Thanks...

Title: Re: Want an auto
Post by: nasnop on October 03, 2007, 05:41:11 PM
TF-904 is a nice transmission.
Shift kits and manual valve bodies are readily available.

The only downfall to a TF-904 behind a 2.5 Jeep is that the jump from 2nd to 3rd is a big one. I often find with steep grades that in 3rd it lugs and 2nd is revving too high.

I have 2 1995 2.5 YJs, one auto with 4.56s on 33s, one 5-speed that is stock.

The auto is an awesome rock crawler that can hang with much bigger rigs, but bogs on grades.
The 5-speed is a race car in comparison.
Title: Re: Want an auto
Post by: kenny kustom on October 03, 2007, 07:23:34 PM
My supercharger will help a little.... Thats the main reason for the auto. 
Title: Re: Want an auto
Post by: Jeffy on October 03, 2007, 07:49:06 PM
TF-904 is a nice transmission.
Shift kits and manual valve bodies are readily available.

The only downfall to a TF-904 behind a 2.5 Jeep is that the jump from 2nd to 3rd is a big one. I often find with steep grades that in 3rd it lugs and 2nd is revving too high.

I have 2 1995 2.5 YJs, one auto with 4.56s on 33s, one 5-speed that is stock.

The auto is an awesome rock crawler that can hang with much bigger rigs, but bogs on grades.
The 5-speed is a race car in comparison.

Ah, cool, so there are manual valve bodies.  Now that I think I about it, I probably did see one before.   :roflol:
Title: Re: Want an auto
Post by: lax22 on October 04, 2007, 07:20:18 AM
What ia a good price for one of these trannys? I found one on car-part.com with 25,000 miles in VA for $1000 but can they be had for cheaper? and will any year 97-2006 30RH swap in with no problems as long as i can get the flex plate and mounting plate and do i still need to upgrade the t-case from 21 to 23 spine if it comes out of another 4 cylinder jeep? 
Title: Re: Want an auto
Post by: oldjeep on October 04, 2007, 10:35:36 AM
$1000??   I wouldn't pay more than $300 and that would be if I wanted one really fast.
Title: Re: Want an auto
Post by: lax22 on October 04, 2007, 11:42:28 AM
Ahh i am not doing that one then hahaha.