I recently did something very similar. If the length of the entire shaft has been increased by 1", the transfer case needs to be removed to install the shaft. Very drastic. I ended up cutting a half inch off of mine and having it rebalanced to avoid that. Another option would be to have a half inch shorter in total shaft, with the properly lengthened splines, and add a spacer where it bolts to the guibo to properly mesh the splines. I didn't bother with that.
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- 2011 BMW X5 x35i
- 2005 BMW X5 4.4i
- 2005 BMW X5 3.0i
- 2004 BMW X5 4.4i
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