i think cossie is getting at the larger diameter of the tyres, which will add a little more strain to the engine etc, as its just the same as gearing the truck up slightly.

cant see it bothering that engine at all tho tbh.

its a work of art Twin Gen, bloody good work man! but i would advise knowing when to stop tho! these things take over ur life.... oh it did already? lol. nah seriously, ive gone too far with my silly funfactor, and ive hit probs that i never expected, hope u dont have similar issues.

keep it up!

doh forgot - the 46t gear u mentioned - it doesnt by any chance have the same cutout on the back as the 43 and 39 tooth stock spurs does it?