456 are for pulling trees and leaving black marks on the pavement. 410's are a nice upgrade that won't have your engine screaming at you going down the highway at 80 mph.Can understand swapping the gears to 456 for manual tranny what but are the benefits for swapping the automatics from 373 to 410.........and if just running the 373 become a problem down the road
Exactly what do you mean by "center parts"? Neither of these differentials has a removeable 'pumpkin' center section like an old Ford or pre '64 GM car/truck. The diff is complete from axle flange to axle flange, though the brake parts may be removed. Even though they both share ratios and will mount into any SSR, these are completely different animals. The auto is a small ring gear Torsen equipped unit, 10 cover bolts, the manual is an Eaton I think clutch actuated unit that is much beefier and heavier with a larger ring gear and a 14 bolt cover. The only thing I can think of as "center parts" would be if someone has taken the internals out of the differential housing and is basically selling the ring and pinion and possibly the carrier assembly. If that is the case these parts are not worth much in the 3.73 ratio.A friend of mine is offered two center parts from ssr, one came from a 2005 with manual trans and the other one from a 2006 aut. But he dont know the ratios thats why i ask what size of ratios they bring from factory so???
Other than droneMy personal preference for the six speed trucks is 4.10. This will still have a meaningful first gear for takeoff. It also provides a second gear loafing through a parking lot without lugging. A full throttle takeoff from a stoplight will have you shifting gears about the middle of the intersection. I love it. Highway cruise in sixth gear gives you almost exactly the same engine rpm as 5th gear with 3.73s.
The 4.10 ratio is excellent for the 03-04 automatics. That is a 10% (math doesn’t lie) increase in rear wheel torque for the same engine output….. Highway engine rpm doesn’t suffer much. It is only a 10% increase in rpm.
The 05-06 automatics can get the same benefit as the 03-04, but it has never been on my radar screen because of the exhaust drone that seems to be resident in the 05-06 when cruising at 2700 rpm. I had 4.10 gears in my SSR after I put the TBSS axle in…… but yanked them out and went to 3.73 when I discovered that the 2700 rpm drone was happening at about 85 mph. Long distance driving is not as much fun with an exhaust drone bugging you.
My two cents worth of personal opinion…….
Shift points are based on RPM and load, not speed.Other than drone
What challenges does an 06 owner face in upgrading to a 4:10. How difficult/ involved is it with respect to reprogramming the cpu to get correct shift points / speedometer reading etc