New to Mopars
03-09-2014, 11:09 PM
#1
New to Mopars
Hi All,
Just bought a 1970 Duster and learning about the variations in the trannys.
The car I bought has what I was told was a 198 (Not original to the car) slant six engine that had been rebuilt with Zero miles.
No tranny was installed, but one with a recent rebuild came with the car.
Upon attempting to install the tranny, I learned the pilot hub on the Torque converter was too large to fit the center hole in the drive plate and the flange centerbore on the crankshaft.
I've learned that the slant six engines 1967-back had crankshafts with a smaller rear flange centerbore. However, I've also noted that the 198 engine appartently did not become available until 1970 so I'm a bit confused as to what I have.
In any event I need a Torque converter that has the smaller pilot hub, but will fit on the 27 spline pilot shafts which are on the later model 904 trannys (the early 904's had a 17 or 18 spline pilot shaft).
I am told the old timers used a "problem solver" torque converter which had the smaller pilot hub and a 27 spline slip to handle the newer 904's with the 27 spline input shaft.
So, I would be interested in hearing how folks have dealt with the issue.
Potential solutions in the order of cost, labor and praticality seem to be:
1) hone down the current pilot hub on my torque converter to fit the crank centerbore. This would also entail installing a later model drive plate with the larger center hole and holes to match up to the current TC bolt holes.
2) Find or custom make a TC that has the small pilot hub and 27 spline slip. (If anyone can point me to who, if anyone, has such a TC or can create one at a reasonable cost it would be appreciated).
3) Remove the crank and hone out the flange centerbore, this assumes the 6 drive plate connecting holes are confiqued the same as the holes in the later model crankshafts with the bigger centerbore in order to use the larger centerhole flex plates used in the later applications and that would match up to my current torque converter bolt holes.
Anyone out there that may be able to assist me with recommendations on this issue, would be appreciated!
Just bought a 1970 Duster and learning about the variations in the trannys.
The car I bought has what I was told was a 198 (Not original to the car) slant six engine that had been rebuilt with Zero miles.
No tranny was installed, but one with a recent rebuild came with the car.
Upon attempting to install the tranny, I learned the pilot hub on the Torque converter was too large to fit the center hole in the drive plate and the flange centerbore on the crankshaft.
I've learned that the slant six engines 1967-back had crankshafts with a smaller rear flange centerbore. However, I've also noted that the 198 engine appartently did not become available until 1970 so I'm a bit confused as to what I have.
In any event I need a Torque converter that has the smaller pilot hub, but will fit on the 27 spline pilot shafts which are on the later model 904 trannys (the early 904's had a 17 or 18 spline pilot shaft).
I am told the old timers used a "problem solver" torque converter which had the smaller pilot hub and a 27 spline slip to handle the newer 904's with the 27 spline input shaft.
So, I would be interested in hearing how folks have dealt with the issue.
Potential solutions in the order of cost, labor and praticality seem to be:
1) hone down the current pilot hub on my torque converter to fit the crank centerbore. This would also entail installing a later model drive plate with the larger center hole and holes to match up to the current TC bolt holes.
2) Find or custom make a TC that has the small pilot hub and 27 spline slip. (If anyone can point me to who, if anyone, has such a TC or can create one at a reasonable cost it would be appreciated).
3) Remove the crank and hone out the flange centerbore, this assumes the 6 drive plate connecting holes are confiqued the same as the holes in the later model crankshafts with the bigger centerbore in order to use the larger centerhole flex plates used in the later applications and that would match up to my current torque converter bolt holes.
Anyone out there that may be able to assist me with recommendations on this issue, would be appreciated!
03-10-2014, 12:56 AM
#2
I'm not familiar with slants, but this problem also exists with earlier 273s. I could be wrong but so far as I know, the only options are (maybe)
I don't think your option 1 will work, but the other 2, and.......
maybe find a later crank. I would think slants should be plentiful enough to do, but ??
I don't think your option 1 will work, but the other 2, and.......
maybe find a later crank. I would think slants should be plentiful enough to do, but ??
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fredmo1947 (03-10-2014)
03-10-2014, 03:19 AM
#3
Mopar Lover
Welcome to the forum... I can't help with your question, but I'm sure someone on here will be able to help... Be sure to check out the Mopar of the Month contest.....
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fredmo1947 (03-10-2014)
03-10-2014, 09:18 AM
#4
I'm on to a guy that is familiar with this whole set up and issues associated with the small pilot hub/27 spline TC. He is confident he can get one to match up. So, we'll know when I get all the parts to him tomorrow, but at this point I'm preparing for a happy dance. I'll update with name of the outfit for future referrnce if this all works out. In the meantime if anyone out there has a Part # for the TC I'll need to make this work, please let me know the # and manufacturer.
Last edited by fredmo1947; 03-10-2014 at 09:22 AM.
:welcome2:
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fredmo1947 (03-10-2014)
03-11-2014, 08:22 AM
#6
Mopar Lover
Welcome to our forums , i will check some readings i have around here if i can find them but im not that good on the slanters but no they are a work horse , again welcome and im sure there will be answers comming from people on here soooon 
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fredmo1947 (03-20-2014)
The following users liked this post:
fredmo1947 (03-20-2014)
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