I have not touched the rear gear on my 2012 Boss (40k miles) and it whined a little at 55 mph at little to no throttle input. I switched to a carbon fiber driveshaft and it was like flipping on a loud irritating switch. The whine is to the point of maximum irritation as it hurts my already tired ear drums when it happens around 55 mph under no load. I changed the gear oil to Mobile 1 gear lube (85W140) but this had no effect. I know Ford had lots of complaints with 3.73 gears so has anyone tried FMS-M420988373SF Ring and Pinion Gears, 8.8" 3.73 RING GEAR AND PINION SUPER FINISHED. Maybe this was created as a fix?
https://performanceparts.ford.com/part/M-4209-88373SF
Applying "Super Finishing" treatment to the gear faces. Super Finishing creates a highly polished non-directional surface that offers the following advantages:
Tim
https://performanceparts.ford.com/part/M-4209-88373SF
Applying "Super Finishing" treatment to the gear faces. Super Finishing creates a highly polished non-directional surface that offers the following advantages:
- Eliminates Break-in
- Reduces Friction, Wear and Heat
- Increases Durability & Component Life
- Reduces Fatigue and Component Failures
- Reduces NVH"
Tim
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