I installed my DGL myself and have had no problems with mine at all. I don't do alot of deep mudding...only once in a while when required. I don't ride very often unfortunately. I don't think any machining modifications ar necessary on the Foreman. It pulls like mad on technical trails when you need it...much better than limited slip. Not too bad for steering effert either. I run it only when 4 wheel drive is needed and 2 wheel drive most of the time.