Wow, I didn't expect such a long reply. You really know your stuff! Do you think for the spline difference my best bet would be to purchase the Total Spline Input Gear or is this something totally different then what I need? http://www.marlincrawler.com/transfer-case/parts-upgrade/total-spline-input-gear

I think the 2" difference won't make a huge difference. The motorhome is not a speed demon. I am getting ready to desmog it which I heard it totally worth it. I appreciate all your help!