the axles will be all right for 400hp or less I pull mine quite often and have never had an issue. it has the same axles as the F250's I have built alot of pullin trucks for people so and the 50 isn't that bad for moderate pulling. my X has 200cc injectors and a GT38R with the 1.15 . we did another moderate truck with a 50 that has mini me's with a 38R and has never broke his 50.