66 slant 6 engine to 78 slant 6 904 trans, what gives - Moparts Forums

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66 slant 6 engine to 78 slant 6 904 trans, what gives #313869 05/10/09 02:22 PM 05/10/09 02:22 PM
Joined: Sep 2008 Posts: 182 Pennsylvania C cantspel OP member
cantspel OP member C Joined: Sep 2008 Posts: 182 Pennsylvania	Seems I have enough pieces laying around to make this happen but apparently not. Crank pilot is 1.55 and TQ is 1.81. I have a pushbutton 904 that the TQ is the correct pilot, but the input splines are different. If I put the front and rear drums from the pushbutton into the 78 will I run into pump problems? should I just swap all 3. The push button is a rear pump jobby. The 78 is at least a non-lockup.

Re: 66 slant 6 engine to 78 slant 6 904 trans, what gives [Re: cantspel] #313870 05/10/09 02:44 PM 05/10/09 02:44 PM
Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska	I'm assuming '66 A with modern rod shifter type linkage & the eng is a 66. Ideally you would want a 66(maybe 67?) 904. A custom TC(not practical)or a later(1968 & up) crank into the 66 /6(probably not practical). I do not know about swapping the trans internals. Best would be to find a later /6 in good shape & use the 78 trans/TC. would need to use the 66 pan/pickup/mtr mts/insulators otherwise it drops in. live every 24 hour block of time like it's your last day on earth

Re: 66 slant 6 engine to 78 slant 6 904 trans, what gives [Re: RapidRobert] #313871 05/10/09 02:56 PM 05/10/09 02:56 PM
Joined: Sep 2008 Posts: 182 Pennsylvania C cantspel OP member
cantspel OP member C Joined: Sep 2008 Posts: 182 Pennsylvania	would a 66-67 TC have have fine or coarse splines. I need fine spline with the smaller pilot to make it happen.

Re: 66 slant 6 engine to 78 slant 6 904 trans, what gives [Re: cantspel] #313872 05/10/09 02:59 PM 05/10/09 02:59 PM
Joined: Jan 2003 Posts: 25,200 Upper Midwest M MoparforLife Too Many Posts
MoparforLife Too Many Posts M Joined: Jan 2003 Posts: 25,200 Upper Midwest	Isn't there room to have the crank machined to accept the larger converter hub?

Re: 66 slant 6 engine to 78 slant 6 904 trans, what gives [Re: cantspel] #313873 05/10/09 02:59 PM 05/10/09 02:59 PM
Joined: Sep 2008 Posts: 182 Pennsylvania C cantspel OP member
cantspel OP member C Joined: Sep 2008 Posts: 182 Pennsylvania	got it, my dacco book shows a 762-S to be what i need, they sent me a 403 which is coarse spline. thanks for the help Last edited by cantspel; 05/10/09 04:07 PM.

Re: 66 slant 6 engine to 78 slant 6 904 trans, what gives [Re: cantspel] #313874 05/10/09 03:03 PM 05/10/09 03:03 PM
Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska	theres no stock TC that will work on the early /6 crank & the later 904. The trans input spline dia/#'s changed along with the TC hub diameter at the same time. live every 24 hour block of time like it's your last day on earth

Re: 66 slant 6 engine to 78 slant 6 904 trans, what gives [Re: cantspel] #313875 05/10/09 03:05 PM 05/10/09 03:05 PM
Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska	what is a 762-S live every 24 hour block of time like it's your last day on earth

Re: 66 slant 6 engine to 78 slant 6 904 trans, what gives [Re: RapidRobert] #313876 05/10/09 03:12 PM 05/10/09 03:12 PM
Joined: Jan 2003 Posts: 25,200 Upper Midwest M MoparforLife Too Many Posts
MoparforLife Too Many Posts M Joined: Jan 2003 Posts: 25,200 Upper Midwest	Quote: theres no stock TC that will work on the early /6 crank & the later 904. The trans input spline dia/#'s changed along with the TC hub diameter at the same time. That is why I asked if the crankshaft can't be machined to take the newer converter hub. Just the reversal if installing a pilot bushing for a manual transmission.

Re: 66 slant 6 engine to 78 slant 6 904 trans, what gives [Re: RapidRobert] #313877 05/10/09 03:13 PM 05/10/09 03:13 PM
Joined: Jan 2003 Posts: 25,903 Rio Linda, CA John_Kunkel Too Many Posts
John_Kunkel Too Many Posts Joined: Jan 2003 Posts: 25,903 Rio Linda, CA	762 is the common rebuilder's number for a '68-up 904 converter used with the /6 and 318, it has the 1.810" pilot hub so it won't work on the pre-'68 crank with a 1.550" register. The 762 "S" might be a special built hybrid with a smaller pilot hub, never seen one but........ The INTERNET, the MISinformation superhighway

Re: 66 slant 6 engine to 78 slant 6 904 trans, what gives [Re: John_Kunkel] #313878 05/10/09 04:14 PM 05/10/09 04:14 PM
Joined: Sep 2008 Posts: 182 Pennsylvania C cantspel OP member
cantspel OP member C Joined: Sep 2008 Posts: 182 Pennsylvania	762s is in my Dacco book as 27 spline 1.55 pilot. Says fits 60-67 engine with 68-up 27spline non-lockup trans. they also make a 762x which is 18spline 60-67 trans with 1.81 pilot for 68-up engine.

Re: 66 slant 6 engine to 78 slant 6 904 trans, what gives [Re: cantspel] #313879 05/11/09 02:11 AM 05/11/09 02:11 AM
Joined: Jan 2003 Posts: 25,903 Rio Linda, CA John_Kunkel Too Many Posts
John_Kunkel Too Many Posts Joined: Jan 2003 Posts: 25,903 Rio Linda, CA	I found and downloaded the Dacco catalog, I didn't know that anybody offered a hybrid but I do now. Great problem solver. The INTERNET, the MISinformation superhighway

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