Originally Posted by thepitcrew
Yes, I noticed that the Factory Team version went to the lightened steel diff's. That was a smart move (though adds weight and spool up time).
The TC4 to Pro4 comparison in Car Action was on carpet and the stiffness of the TC4 I'm sure helped it a lot. If you study the pictures, you'll see that the Pro4 was not using the Hara upper deck. That is a stock or 3mm upper deck. The Hara deck even with a stiffner in the middle would have been soft on carpet. I would love to see this comparison re-run on Asphalt.
If you buy the stock Pro4, I have found that dropping to the number two shock pistons and AE 30wt oil, and using the Hara setup, and grinding 2.5mm off the upper deck on each side of the middle, gives a pretty close approxiamtion of the Hara. (USE a mask when grinding)
Not just the thicker decks but they tested the PRO 4 with a spool on FOAMS. Nobody runs FOAMS and a spool. If they'd have put a diff in the front of the Pro 4 it would've been no contest.