you said that you have the two speed tranny? if not then you can use hpi part # A444. its a 44 tooth spur gear. thats what i use on my XL. It just has to be trimmed a bit and then its ready to rock and roll. but as hawk 900 said before, definately replace your clutchbell and spring. I recently did that and I cant believe the difference. Havent stripped one since! Hope this helps. Arlin.