56 Rear End Original Gear Ratio

C
Last seen
Joined
Jan 11, 2020
Thunderbird Year
1956
Any way to check if a rear end is original? What gear ratio's were standard for an automatic? And mine is leaking at the pinion. Can the seal be replaced with the pinion in the car?
 
if it has a removable panel on the backside, it is probably original. The gear ratio for the automatic is 3:31. Yes, you can replace the pinion seal without removing the pinion from the car. You need to take off the pinion yoke and then remove the seal.
 
Your subject ”56 Rear End" has beed changed to "56 Rear End Original Gear Ratio" to summarize your post.

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Attached is an article from the July/August Early Bird magazine which might answer your questions regarding the differential on your car.

doug7740
1955 Thunderbird Blue
 

Attachments

  • Differential Assembly.pdf
    1 MB · Views: 12
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