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23spline & 18 spline tailshaft same? #297086 04/22/09 11:21 PM 04/22/09 11:21 PM
Joined: Sep 2003 Posts: 654 Lexington,VA 6 68gtxsurvivor OP mopar
68gtxsurvivor OP mopar 6 Joined: Sep 2003 Posts: 654 Lexington,VA	I am wanting to change the tailshaft on my 69 or back hemi 4 speed to a 70 or up dual pad tail shaft and have plenty of 23 splines, are the tailshafts the same?

Re: 23spline & 18 spline tailshaft same? [Re: 68gtxsurvivor] #297087 04/22/09 11:40 PM 04/22/09 11:40 PM
Joined: Jan 2003 Posts: 6,377 Abilene, Texas F fastmark master
fastmark master F Joined: Jan 2003 Posts: 6,377 Abilene, Texas	The tail shafts are slightly different. The hemi box uses a bigger rear bearing on the tailshaft. I am pretty sure you can just use the smaller bearing and the 23 splined tail shaft and shaft and be ok. I think I have done that before. It has been a while since I have been into one of those and I don't really do that many of them.

Re: 23spline & 18 spline tailshaft same? [Re: 68gtxsurvivor] #297088 04/23/09 12:21 AM 04/23/09 12:21 AM
Joined: Oct 2005 Posts: 8,853 Ontario, Canada S Stanton Don't question me!
Stanton Don't question me! S Joined: Oct 2005 Posts: 8,853 Ontario, Canada	I don't think the tailshaft bearing is different between the two, only the input bearing. Why not go to the Passon or Brewer website and see what you can find ?

Re: 23spline & 18 spline tailshaft same? [Re: 68gtxsurvivor] #297089 04/23/09 12:31 AM 04/23/09 12:31 AM
Joined: Mar 2008 Posts: 766 Ohio Dan Brewer super stock
Dan Brewer super stock Joined: Mar 2008 Posts: 766 Ohio	Quote: I am wanting to change the tailshaft on my 69 or back hemi 4 speed to a 70 or up dual pad tail shaft and have plenty of 23 splines, are the tailshafts the same? 66-7 18 spline will be a 307 brg 68-9 18 spline will be a 308, same as the C99539 70-Up B/E tailhousing A833 4-speeds, parts & services http://www.brewersperformance.com/

Re: 23spline & 18 spline tailshaft same? [Re: fastmark] #297090 04/23/09 12:32 AM 04/23/09 12:32 AM
Joined: Nov 2003 Posts: 2,715 closer to Canadian beer! torkrules I'm neurotic
torkrules I'm neurotic Joined: Nov 2003 Posts: 2,715 closer to Canadian beer!	Quote: The tail shafts are slightly different. The hemi box uses a bigger rear bearing on the tailshaft. I am pretty sure you can just use the smaller bearing and the 23 splined tail shaft and shaft and be ok. I think I have done that before. It has been a while since I have been into one of those and I don't really do that many of them. The 18 spline box uses the 308 (large bearing) instead of the smaller 307 bearing. The snap ring also retains on the bearing with the 18 spline tail instead of on the extension housing. You can use either extension housing as long as you use the appropriate bearing. The output shafts are the same. I redid my 23 spline box with 18 spline guts and used the 23 spline output shaft, extension housing and bearing.

Re: 23spline & 18 spline tailshaft same? [Re: torkrules] #297091 04/23/09 08:40 AM 04/23/09 08:40 AM
Joined: Jan 2003 Posts: 74,937 U.S.S.A. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 74,937 U.S.S.A.	Someone gave the correct answer above , big block applications of the 23 spline with the B/E tailhousing use the 308 bearings both front and rear , the OP says he has a bunch of 70 up b/e to chose from so he can probably find the tail he needs. OR you can just switch to the 307 bearing if you don't have the right tailhousing , trans will be fine for as little as these cars are used now .

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