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EFV-8 Club Forum / General Lincoln Discussion / 1947 Lincoln pinion spline count

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Posted By Discussion Topic: 1947 Lincoln pinion spline count

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05-31-2020 @ 7:14 PM
Posts: 2
Joined: Sep 2019
I am wanting to convert my rear end to open drive, what i want to know before I order the parts is if it is a 6 or 10 spline. It was a v12 3speed overdrive. I am going with a 302 AOD and want to keep my orig rear end. has anyone made this conversion? Thanks for any help.

06-01-2020 @ 11:36 AM
Posts: 17
Joined: Feb 2019
Why would you want to do that? The car in the photo is a 46 Lincoln, not a 47. The V-12s in 1946 were 305 cubic inches of displacement.

06-01-2020 @ 12:54 PM
Posts: 2
Joined: Sep 2019
The v12 is long gone, the 302 is already in its place, I am going to the AOD so my wife can drive it. It is registered as a 1947. Same question, is it a 6 or 10 spline pinion? Thanks

06-02-2020 @ 9:17 AM
Posts: 6433
Joined: Oct 2009
It is not advisable to keep the stock rear end with out a torque tube. The rear end will want to rotate every time there is a change in speed and you could end up with catastrophic damage and an uncontrollable car. The transverse spring on your Lincoln will make it even more hazardous and could kill you and your wife.

To convert to an open drive shaft you will have to engineer some spring mounts for parallel springs and then use a rear end and springs designed for an open drive shaft. You also need to match the rear end ratio with the output of the engine and transmission

I strongly suggest that you have someone who has the engineering background for this conversion to to this for you. It is not a simple job of welding spring mounts to the body and then using parallel springs. Everything needs to be reinforced to take the different stresses that will be applied to the body and chassis.

The Lincoln Chassis parts catalog does not specify the spline count on the sleeve.


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