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70 duster 3 speed to a 4 speed? #999288 05/24/11 07:09 PM 05/24/11 07:09 PM
Joined: Jan 2004 Posts: 1,468 N.Y. sixpacksteve OP pro stock
sixpacksteve OP pro stock Joined: Jan 2004 Posts: 1,468 N.Y.	my buddy just got a 70 duster slant 6 w/3 speed and wants to convert to a 4 speed. what bellhousing will he need and whats the biggest clutch it will accept? need your help thanks! Hell Hath No Fury Like Mine

Re: 70 duster 3 speed to a 4 speed? [Re: sixpacksteve] #999289 05/24/11 09:24 PM 05/24/11 09:24 PM
Joined: Mar 2010 Posts: 632 MD-USA D Dodgeguy101 mopar
Dodgeguy101 mopar D Joined: Mar 2010 Posts: 632 MD-USA	This may help, but I have a 71 Demon that came with a 318, 3 speed. I put a 4 speed in it, and all I did was take out the 3 speed, put the 4 speed in. Only thing that was changed was the rear yoke in the trans. Everything else remained the same. Bell housing should stay the same, again not an expert on I6, and the biggest clutch would probably be the 10.5. Last edited by Dodgeguy101; 05/24/11 09:26 PM.

Re: 70 duster 3 speed to a 4 speed? [Re: sixpacksteve] #999290 05/24/11 09:53 PM 05/24/11 09:53 PM
Joined: Mar 2005 Posts: 3,445 N.Wilkesboro,NC D DusterKrazy master
DusterKrazy master D Joined: Mar 2005 Posts: 3,445 N.Wilkesboro,NC	IIRC, I believe the slant six cars used something like a small 9 1/4 clutch setup. The V8's use a "10.5 -23 spline unit for the clutch. He will need a bellhousing from 318,340 or 360 engine. Last edited by DusterKrazy; 05/24/11 09:55 PM.

Re: 70 duster 3 speed to a 4 speed? [Re: DusterKrazy] #999291 05/24/11 10:45 PM 05/24/11 10:45 PM
Joined: Aug 2003 Posts: 43,190 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,190 Bend,OR USA	Quote: IIRC, I believe the slant six cars used something like a small 9 1/4 clutch setup. The V8's use a "10.5 -23 spline unit for the clutch. He will need a bellhousing from 318,340 or 360 engine. I have not seen a slant six bellhousing, stock or aftermarket ,thats fits both a Mopar SB V8 and a slant six I've done the same as one of the other posters, removed a three speed stick(medium duty) from a 1973 340 duster and put in a NP833 4 speed out of another A body, I used the earlier (pre 1969)A body 4 speed shifter also I'm thinking the clutch splines (23) and input shaft diameters are all the same on the non Hemi and 440 HD 18 spline 4 speed clutches Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

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