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3:73 vs 3:90 rear end.


Dodgy49

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The 49 Coronet has a 3:90 rear gear, BUT it is in rough shape. I have a 3:73 rear end out of a 50 wayfarer, in good shape. The only differences  I can find are the ratio and drum size. The Coronet has 11” drums where the Wayferer has 10” drums (but they work) RPM calculators show a difference of 100 Rpm at the same speed. I’m going to swap the rear end BUT I am curious as to what you guys think. I’ve never driven the car aside from around the block, but if the 3:90 is worth a rebuild I can start getting parts together and still keep the project moving forward. 

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Change just the 3rd. member from the 3.73 wayfarer  rear end  to your coronet housing and use the some housing, axles and 11" brakes I believe is you best choice hands down.

 

Install new seals  throughout and be golden!  ?

 

 

DJ

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go with the 3.73 it is an ideal ratio.  If you have the speedometer drive  gear  from the wayfarer it will keep your speedo accurate.

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Check those axle shaft bearings and races for spalling/pitting too.

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