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The diffs are completely and totally incompatible, you will not be able to use anything from the 2006 but for the engine,trans and transfer case.Thank you for the information. I have a 2006 duramax truck complete. I was planning on changing motor, trans and dif. I'm not sure what the gears are in the 06 but I'm just in the planning stages so things can change quickly. I restore cars for a living and am not scared but I also don't want to waste money or time. The M1151 is my wife's Christmas present
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Even with a body lift it is like stuffing 10lb of crap in a 5lb bag and this is a TOTALLY different animal than anything else you have ever worked on and it seems you have not done your homework.
I am not trying to discourage you but this is not an easy project, in fact it is not even a difficult project, it is much more than that.
![BAG.jpg BAG.jpg](https://www.steelsoldiers.com/data/attachments/638/638696-2ead66bbda7a72af7f6eecfb6da50fb9.jpg)