Rear axle gear sets

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David R.
Posts: 160
Joined: August 17th, 2019, 1:52 pm
Body Type: Chassis
Model Year: 1930
Location: WV

Rear axle gear sets

Post by David R. » December 6th, 2019, 9:31 am

Would I be correct in assuming that the 5.14 and 6.6 gear sets would be interchangeable in the bevel gear rear ends? Just wondering.
I have a spare axle with the 6.6 gears and was thinking if it is better shape I might try swapping gear sets.

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Neil Wilson
Posts: 2858
Joined: February 5th, 2003, 9:42 pm
Body Type: 82-A/89-A
Model Year: 1930
Location: Boulder, CO
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Re: Rear axle gear sets

Post by Neil Wilson » December 6th, 2019, 10:49 am

David R. wrote:
December 6th, 2019, 9:31 am
Would I be correct in assuming that the 5.14 and 6.6 gear sets would be interchangeable in the bevel gear rear ends? Just wondering.
I have a spare axle with the 6.6 gears and was thinking if it is better shape I might try swapping gear sets.
Those gear sets are interchangeable. A change in gear ratio requires a change in the speedometer drive and driven gears also (if you want the speedometer to be accurate). At an engine rpm of 2350, the 6.6:1 ratio will be about 10 mph slower. See https://aafords.com/aa-information/#mph
Regards, Neil Wilson
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neil@aafords.com - use this email for contact
https://aafords.com/ - Ford Model AA Truck Club @ aafords.com

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