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Does anybody know what the factory gear was in the 67 galaxie 390 cars? I am going to be driving the hot rod power tour this year, and I want to lower my freeway RPMs because my trip will end up being 2900 miles round trip, and I dont want to buy all the extra gas... I currently have a 3.89 gear in the car and it has a C6 transmission.
 

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Does anybody know what the factory gear was in the 67 galaxie 390 cars? I am going to be driving the hot rod power tour this year, and I want to lower my freeway RPMs because my trip will end up being 2900 miles round trip, and I dont want to buy all the extra gas... I currently have a 3.89 gear in the car and it has a C6 transmission.
It varied by option i believe. Mine is a 390 XL car with the original 2.75 rear. ( I still have the original build tag)
 

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My 67 has a 2.75.

Code Ratio Code Ratio
1 3.00:1 A 3.00:1
4 3.25:1 D 3.25:1
5 3.50:1 F 2.80:1
6 2.80:1
8 2.75:1
9 4.11:1
0 3:10:1

This is from the 67 Ford and Mercury Shop Manual. Letters designate locking differential. The 2.80:1 rearend is the WER integral rearend.
 
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