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Hello,

Try Dr. Diff on a S-60, and keep an eye on the ad's for a 18 spline 4-speed. My opinion is that what you have will work good unless abused.
 
Try Dr. Diff on a S-60, and keep an eye on the ad's for a 18 spline 4-speed. My opinion is that what you have will work good unless abused.
And if it is original to the car don't sweat it. I put a high comp hemi in my 71 cuda, used fine spline 4 spd and 8 3/4 with zero issues. Even made passes and street raced it. Traction is the enemy. As in dead hook
 
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