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904 swap help. #1449182 06/08/13 05:22 AM 06/08/13 05:22 AM
Joined: Apr 2006 Posts: 453 California S shamefulcuda OP mopar
shamefulcuda OP mopar S Joined: Apr 2006 Posts: 453 California	I'm wondering if a 904 trans out of a 85 dodge truck will work in my 72 challenger? He also has a 904 out of a 78 dodge but he doesn't know if it works, would that also work in my car ok? I'm just trying to get my chally moving this weekend. The 904 in truck I can drive so I know it works. Just seems to new to work in my car as I wasn't aware they still were producing 904s then. Thanks for any help

Re: 904 swap help. [Re: shamefulcuda] #1449183 06/08/13 05:54 AM 06/08/13 05:54 AM
Joined: May 2012 Posts: 100 Tennessee M meep_meep member
meep_meep member M Joined: May 2012 Posts: 100 Tennessee	It's the same transmission, except for the speedo gear and housing will have to be swapped from your old transmission...

Re: 904 swap help. [Re: meep_meep] #1449184 06/08/13 08:54 AM 06/08/13 08:54 AM
Joined: May 2003 Posts: 15,487 Florida S scratchnfotraction I Live Here
scratchnfotraction I Live Here S Joined: May 2003 Posts: 15,487 Florida	use the TP valve lever and the gear selector lever from the trans in your car along with the speedo gear/housing. that keeps the linkage correct for the car and speedo correct. 85 truck may or may not have the lock-up trans,you tell by the input shaft on them. your 72 904 would be non lock up,the 78 904 maybe non lock up lock up =better MPG non lock up = more perfomance splines to the end are non-lock up 1.5" smooth end on tip of input is a lock up the TC between the 2 do not mix. Last edited by scratchnfotraction; 06/08/13 08:57 AM.

Re: 904 swap help. [Re: scratchnfotraction] #1449185 06/08/13 01:12 PM 06/08/13 01:12 PM
Joined: Apr 2006 Posts: 453 California S shamefulcuda OP mopar
shamefulcuda OP mopar S Joined: Apr 2006 Posts: 453 California	So my 72 is non lock up trans, but if the truck one ends up being a lock up trans as long as I use the converter out of the truck as well I'm ok? Thanks this is really helpful

Re: 904 swap help. [Re: shamefulcuda] #1449186 06/08/13 07:40 PM 06/08/13 07:40 PM
Joined: Sep 2007 Posts: 14,889 up yours Supercuda About to go away
Supercuda About to go away Joined: Sep 2007 Posts: 14,889 up yours	Quote: So my 72 is non lock up trans, but if the truck one ends up being a lock up trans as long as I use the converter out of the truck as well I'm ok? Thanks this is really helpful Maybe. Depends on what engine is in front of the 904, 318 in both then yes. I'll assume it's a V8 here, I suppose it could be a slant 6 in both. They make 904 type transmissions till 89 in the M bodies, They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.

Re: 904 swap help. [Re: Supercuda] #1449187 06/08/13 08:22 PM 06/08/13 08:22 PM
Joined: May 2003 Posts: 15,487 Florida S scratchnfotraction I Live Here
scratchnfotraction I Live Here S Joined: May 2003 Posts: 15,487 Florida	Quote: Quote: So my 72 is non lock up trans, but if the truck one ends up being a lock up trans as long as I use the converter out of the truck as well I'm ok? Thanks this is really helpful Maybe. Depends on what engine is in front of the 904, 318 in both then yes. I'll assume it's a V8 here, I suppose it could be a slant 6 in both. They make 904 type transmissions till 89 in the M bodies, you wont really know till you pull it out and ID it...72 could of had a trans replaced with anything by 2013. post the # along the edge of trans pan rail from driver side..this will tell what yr the case is. but agian, many things could have been done to it since then on the inside.

Re: 904 swap help. [Re: shamefulcuda] #1449188 06/08/13 09:11 PM 06/08/13 09:11 PM
Joined: Dec 2004 Posts: 801 central CT cudazappa super stock
cudazappa super stock Joined: Dec 2004 Posts: 801 central CT	If your 72 is a floor shift the truck trans may not have the boss cast in it for the floor shift bracket. BTDT. 1971 Challenger

Re: 904 swap help. [Re: cudazappa] #1449189 06/08/13 09:48 PM 06/08/13 09:48 PM
Joined: May 2003 Posts: 15,487 Florida S scratchnfotraction I Live Here
scratchnfotraction I Live Here S Joined: May 2003 Posts: 15,487 Florida	Quote: If your 72 is a floor shift the truck trans may not have the boss cast in it for the floor shift bracket. BTDT. thats a very good point and something to watch for with floor shifters

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