few questions about 904 tranny in my 340 roadrunner... - Moparts Forums

Register Log In Moparts Forums Moparts Question and Answer few questions about 904 tranny in my 340 roadrunner...

Print Thread

few questions about 904 tranny in my 340 roadrunner... #1259088 06/29/12 12:55 AM 06/29/12 12:55 AM
Joined: Nov 2003 Posts: 3,106 Ridgeland Wi M mopars_1 OP master
mopars_1 OP master M Joined: Nov 2003 Posts: 3,106 Ridgeland Wi	I have a few questions regarding a 904 in my 71 340 roadrunner. my car originally had a 727, but for a few factors, Im running a 904 instead. im pretty sure the tail shaft lengths are different between 727 and 904. would I be able to use my original drive shaft? or does it have to be lengthened? also, the tranny I got came out of a A body, IIRC, it doesn't matter like it does for 4 speeds as far as overall length goes? thanks -kevin 1971 Plymouth Duster 340 auto 1937 Plymouth PT50 1969 Dodge Dart Swinger 340 4 speed 2013 Ram laramie 2500 hemi 2008 Harley FLSTSB springer

Re: few questions about 904 tranny in my 340 roadrunner... [Re: mopars_1] #1259089 06/29/12 01:06 AM 06/29/12 01:06 AM
Joined: Feb 2005 Posts: 213 Wisconsin M moparkid88 enthusiast
moparkid88 enthusiast M Joined: Feb 2005 Posts: 213 Wisconsin	As far as I know all 904s are the same length..Also I'm pretty sure the driveshaft has to be lengthened. 1973 Charger SE 1987 Ram 4x4 lifted 318 4spd 1984 Ram 4x2 mild 360 1995 Neon 2.0 w/bolt ons

Re: few questions about 904 tranny in my 340 roadrunner... [Re: mopars_1] #1259090 06/29/12 01:29 AM 06/29/12 01:29 AM
Joined: Jan 2003 Posts: 2,111 Bowie, MD R Reggie top fuel
Reggie top fuel R Joined: Jan 2003 Posts: 2,111 Bowie, MD	All 904 lengths are the same. If you're swapping a 904 in place of a 727, the 904 is shorter so the 727 driveshaft will be too short. AFAIK you cant lengthen the driveshaft - the tube has to be replaced. No change needed for the crossmember though. 7269713-727&900SeriesDimensions.JPG (50 downloads) Last edited by Reggie; 06/29/12 01:29 AM.

Re: few questions about 904 tranny in my 340 roadrunner... [Re: mopars_1] #1259091 06/29/12 01:47 AM 06/29/12 01:47 AM
Joined: Aug 2005 Posts: 11,543 chicagoland,usa B buildanother I Live Here
buildanother I Live Here B Joined: Aug 2005 Posts: 11,543 chicagoland,usa	Your 904 will need a longer driveshaft AND a smaller diameter spline-yoke.

Re: few questions about 904 tranny in my 340 roadrunner... [Re: mopars_1] #1259092 06/29/12 02:09 AM 06/29/12 02:09 AM
Joined: Jan 2003 Posts: 75,008 U.S.S.A. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 75,008 U.S.S.A.	Yes as said longer shaft and the different yoke , also that 904 needs to be up to the task of handling the 340 .

Re: few questions about 904 tranny in my 340 roadrunner... [Re: JohnRR] #1259093 06/29/12 02:13 PM 06/29/12 02:13 PM
Joined: Nov 2003 Posts: 3,106 Ridgeland Wi M mopars_1 OP master
mopars_1 OP master M Joined: Nov 2003 Posts: 3,106 Ridgeland Wi	thanks guys for the feedback. I just remembered I have a drive shaft out of a 72 318/ 904 sattelite I guess that should go right in. the 904 isn't going to be stock 1971 Plymouth Duster 340 auto 1937 Plymouth PT50 1969 Dodge Dart Swinger 340 4 speed 2013 Ram laramie 2500 hemi 2008 Harley FLSTSB springer

Re: few questions about 904 tranny in my 340 roadrunner... [Re: mopars_1] #1259094 06/29/12 02:41 PM 06/29/12 02:41 PM
Joined: Jan 2003 Posts: 75,008 U.S.S.A. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 75,008 U.S.S.A.	Quote: thanks guys for the feedback. I just remembered I have a drive shaft out of a 72 318/ 904 sattelite I guess that should go right in. the 904 isn't going to be stock Did that car have the same rear as your runner ?

Re: few questions about 904 tranny in my 340 roadrunner... [Re: JohnRR] #1259095 06/29/12 07:05 PM 06/29/12 07:05 PM
Joined: Nov 2003 Posts: 3,106 Ridgeland Wi M mopars_1 OP master
mopars_1 OP master M Joined: Nov 2003 Posts: 3,106 Ridgeland Wi	Quote: Quote: thanks guys for the feedback. I just remembered I have a drive shaft out of a 72 318/ 904 sattelite I guess that should go right in. the 904 isn't going to be stock Did that car have the same rear as your runner ? it was an 8 1/4. I spose I spoke too soon? or were 8 1/4s similar enough? 1971 Plymouth Duster 340 auto 1937 Plymouth PT50 1969 Dodge Dart Swinger 340 4 speed 2013 Ram laramie 2500 hemi 2008 Harley FLSTSB springer

Re: few questions about 904 tranny in my 340 roadrunner... [Re: mopars_1] #1259096 06/29/12 09:02 PM 06/29/12 09:02 PM
Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska	Both 8&1/4's? I would mock it up with the suspension loaded & see what you do have for end play. Want 3/4"-1" live every 24 hour block of time like it's your last day on earth

Re: few questions about 904 tranny in my 340 roadrunner... [Re: RapidRobert] #1259097 06/29/12 10:37 PM 06/29/12 10:37 PM
Joined: Nov 2003 Posts: 3,106 Ridgeland Wi M mopars_1 OP master
mopars_1 OP master M Joined: Nov 2003 Posts: 3,106 Ridgeland Wi	Quote: Both 8&1/4's? I would mock it up with the suspension loaded & see what you do have for end play. Want 3/4"-1" my roadrunner has the standard 8 3/4. good to know the 3/4-1" though. thanks! 1971 Plymouth Duster 340 auto 1937 Plymouth PT50 1969 Dodge Dart Swinger 340 4 speed 2013 Ram laramie 2500 hemi 2008 Harley FLSTSB springer

Re: few questions about 904 tranny in my 340 roadrunner... [Re: mopars_1] #1259098 06/30/12 02:57 PM 06/30/12 02:57 PM
Joined: Jan 2003 Posts: 75,008 U.S.S.A. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 75,008 U.S.S.A.	Quote: Quote: Both 8&1/4's? I would mock it up with the suspension loaded & see what you do have for end play. Want 3/4"-1" my roadrunner has the standard 8 3/4. good to know the 3/4-1" though. thanks! 8.25 driveshaft is different length than 8.75 , I'm do not know the difference in length . edit ... a check of the tech archive says the 8.25 driveshaft will be ~.66" LONGER than the 8.75 driveshaft. up to you to determine if this is going to be a problem. Last edited by JohnRR; 06/30/12 03:00 PM.

Re: few questions about 904 tranny in my 340 roadrunner... [Re: JohnRR] #1259099 07/03/12 02:06 PM 07/03/12 02:06 PM
Joined: Nov 2003 Posts: 3,106 Ridgeland Wi M mopars_1 OP master
mopars_1 OP master M Joined: Nov 2003 Posts: 3,106 Ridgeland Wi	Quote: Quote: Quote: Both 8&1/4's? I would mock it up with the suspension loaded & see what you do have for end play. Want 3/4"-1" my roadrunner has the standard 8 3/4. good to know the 3/4-1" though. thanks! 8.25 driveshaft is different length than 8.75 , I'm do not know the difference in length . edit ... a check of the tech archive says the 8.25 driveshaft will be ~.66" LONGER than the 8.75 driveshaft. up to you to determine if this is going to be a problem. Thank you very much for looking that up for me! would .66" really matter? Im no driveshaft expert lol 1971 Plymouth Duster 340 auto 1937 Plymouth PT50 1969 Dodge Dart Swinger 340 4 speed 2013 Ram laramie 2500 hemi 2008 Harley FLSTSB springer

Re: few questions about 904 tranny in my 340 roadrunner... [Re: mopars_1] #1259100 07/03/12 05:14 PM 07/03/12 05:14 PM
Joined: May 2012 Posts: 34 Alabama USA Silver6Pak member
Silver6Pak member Joined: May 2012 Posts: 34 Alabama USA	Any time I ever went from a 904 to a 727, I had to shorten the driveshaft. Reverse of what you are doing. Here in town there is a shop that specializes in driveshafts and such. They also stock Spicer/Dana Ujoints and do a fine job.

Re: few questions about 904 tranny in my 340 roadrunner... [Re: mopars_1] #1259101 07/03/12 05:23 PM 07/03/12 05:23 PM
Joined: Jan 2003 Posts: 2,111 Bowie, MD R Reggie top fuel
Reggie top fuel R Joined: Jan 2003 Posts: 2,111 Bowie, MD	Quote: Thank you very much for looking that up for me! would .66" really matter? Im no driveshaft expert lol You need to make sure that you have at least 3/4" to 1" of travel room. Do this with the car resting on the suspension.

Re: few questions about 904 tranny in my 340 roadrunner... [Re: Reggie] #1259102 07/03/12 11:12 PM 07/03/12 11:12 PM
Joined: Nov 2003 Posts: 3,106 Ridgeland Wi M mopars_1 OP master
mopars_1 OP master M Joined: Nov 2003 Posts: 3,106 Ridgeland Wi	Quote: Quote: Thank you very much for looking that up for me! would .66" really matter? Im no driveshaft expert lol You need to make sure that you have at least 3/4" to 1" of travel room. Do this with the car resting on the suspension. understood 1971 Plymouth Duster 340 auto 1937 Plymouth PT50 1969 Dodge Dart Swinger 340 4 speed 2013 Ram laramie 2500 hemi 2008 Harley FLSTSB springer

Moderated by Al_Alguire, Hotwheelsjr, moparts, not_a_charger, RangerDan440, tboomer

Hop To

Powered by UBB.threads™ PHP Forum Software 7.7.1