Where's the best deal to get "original" FMS 3.73's?

[STREETFIGHTER50]

Heard that the original ("A" at the end of the part #) Ford gears are better than the newer ones being made by Motive ("M" at the end of the part #). Who sells them for the best price shipped to CA?

 

[Reed]

For shipping, I would recommend MustangTuning
http://www.mustangtuning.com/fopege3ra1.html

Free shipping and fairly low price ($179.99)

Ford wants $199.99 for them. Also, their website lists only M-4209-F373N as a part number for the gears. This is the same one I have in my car now. It says it replaces M-4209-F373. The other part number with an "M" (M-4209-F373M) is listed as gears for a 7.5 rear.

Anyway, FWIW, the "N" in that part number indicates a new CNC process for cutting the gears which apparently produces stronger gears, so I'd say you're pretty safe with the "N" set.

 

[STREETFIGHTER50]

Heard that the newer gears are made by Motive Gear is to why they have the "M" at the end of the part#. I know a few people saying that Motives whine.

 

[Nopantz]

I have 4.10 Motives...no problems

 

[04sleeper]

Try here.
http://www.buyfordracing.com/shop/product_info.php?products_id=459

$149.00

 

[wgpaintballer]

whats the diffence between the new and old ones..?

 

[Reed]

"New manufacturing technology utilizing a Face Hob Process which features a single pass pinion tooth machining operation compared to a conventional three pass process for machining. CNC cut and lapped gear teeth. Higher strength and better quality gears are produced with the Face Hob Process. NOTE: These new gears look a little different, the gear teeth are cut on a different angle and the ring gear has a bevel on the back of the gear."