My eight-t with the straight cut gears I would go through a pinion shaft every half a gallon on the front and rear and had to make sure the mesh was good and shimmed properly. On my D8 and D8T the spiral cut gears I put them in and the only time I took them out was when I was changing the diff fluid out, never found any filings come off of them and haven't changed them since I got the new buggy and truggy. I imagine maybe I may have done something wrong with the straight cut gears but even the other guys at the track helped me with shimming and setting it up but that didn't make any difference in the wear. I like the gear mesh of the spiral cut gears maybe I just have bad luck with the straight cut gears.
