1st question does anyone run 40 series tires and rims? do they fit or work well? (only reason for the 40 series is thats what 85% run at my track)
2nd question the Limited Slip Diffs that used to come stock on the TR what would the truck act like with crosspins up front and rear and the LSD in the center? I know the way the LSD works is that it provides power to the wheel with the most grip so I think I could use that as an advantage or does it not work that well?

Hey Ace,
Actually, the LSD provided MORE power to the wheel with the least traction thats called "Unloading the diff". for example when you are powering out of a corner and 1 of the tires lifts just enought o break traction it will spin more and unload the diff and keep the truck settled down so the other wheels can grab more traction instead of all wheels spinning and causing your truck to loop out. The Cross Pin Diffs Are More Durable and reliable cause they have a ridgid connection to the opposing spider gear so it keeps all four spider gears in the proper position inside the diff reducing the chance of failure.

The 40 series tires on a Matrix TR does not make much sense to me since they are taller and heavier, thus harder to build quick speed and create extra load on the drive train. But maybe those guys are changing the gearing to compensate for those negatives, but still not sure why they would go bigger and and strain the wheel bearings..The OEM sized TR wheels are lighter and smaller diameter, so would be better suitef for more snap and excelleration. Oh well what do I know..

I hope this helps

the reason for the 40 series I've been told is "the track is just demolished because for a long time all they ran was a big block MT" and the tire of choice was mulchers and they did just that turned the track to crap and the line around the track is heavily rutted and the people that run standard size wheels say they run into alot of broken parts by catching said ruts. thats just the general consensus at the track. I dont know if its right though maybe the standard wheel drivers are just hacks? and thanks for the info on the diffs I had just been told on 3 or 4 different websites that the LSDs performed like that. I havent gotten myself a TR yet Im waiting for a little more money and im going to do the trade in and get it directly from CEN and I've already planned on getting new servos and the aluminum servo saver arm and putting rear hinge pins in the front links. I unlike alot of people actually do a lot of homework before deciding on a kit but thats just the way I am. But I saw recently that CEN changed over to a SH .28 does anyone have the updated kit? I was also wondering why they changed the motor out I had heard nothing but good about the CEN .28 except for 2 people thats exploded theirs but whatever

Yes i do have the new version. I think they switched from the "Go" .26 engine to the SH.28.I do notknow if thats for sure though

they went from a cen .28 to a SH .28 hows it running for you?