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-   -   Mopar v8 swap with mopar tf904 (http://www.jeepforum.com/forum/f12/mopar-v8-swap-mopar-tf904-1549398/)

Klas 07-15-2013 06:37 PM

Mopar v8 swap with mopar tf904
 
I have this thought of doing a mopar v8 swap in my 89 yj.
It has the tf999 and stock transfercase.
This is my question: Can I put the internals and tail housing from my jeep tf999
And put it in a mopar tf904 housing??
If so, it would be a piece of cake to do this swap.
It would be a tf999 with mopar bolt pattern.

Best regards
Klas

deathtrap 07-15-2013 10:46 PM

I think so. There may be year to year differences, like lock up torque converters, etc. but should work.

Klas 07-16-2013 09:23 AM

If thats the case, why doesnt more people do that? It have to be a catch somewhere.

SeanB95YJ 07-16-2013 10:00 AM

personally I have no clue if it would work or not, but I'm curious - why not just use the 904 as-is?

Klas 07-16-2013 10:07 AM

You have to put the tailhousing from the tf999 on the 904 to make it work with the transfer case.

LaddieHanus 07-16-2013 01:29 PM

Also the 999 has a 2.74 for the first gear vs 2.45 for the 904. I have heard that you can use the jeep output shaft and tail housing on the 904 but haven't heard of anyone doing it. I am using a 727 trans from a mid 80's dodge truck as its beefier and will bolt to the NP231 in my YJ after I change the input gear on the transfer case.

deathtrap 07-16-2013 11:00 PM

Quote:

Originally Posted by Klas (Post 15682621)
You have to put the tailhousing from the tf999 on the 904 to make it work with the transfer case.

Yes this^^. And I believe the 245 and 274 gear sets can be swaped also.

Klas 07-17-2013 03:01 AM

I rebuilt my tf999 a couple of years back, regret that I didnt think of checking this, since I have a tf904 laying around.


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