I own a 2002 GMC SIERRA 2500HD 6.6L Duramax with 300,000km on it. In due time this truck will require some major work with the tranny and engine. What I'm aiming towards is that I need some advice on an engine and tranny swap. At a local auction there is a non-repairable 2007 Chevrolet Silverado 2500HD with a duramax diesel. It appears it was rolled and can't be fixed but can be sold for parts. So, my question is, would I be able to accomplish an entire engine and tranny/t-case swap from that 2007 to my 2002 if I will have both standing side by side and access to everything from the 2007? All advice and a slap to the face for a wake up call is greatly appreciated. Thank you kindly.

You can do it, but why??? With all the time and money you would spend on that swap you could easily do any motor/trans work to your LB7/5speed.

You about have to rewire the whole truck. Will be issues with the 2002 BCM with the 2007 ECM and TCM which they will be using. Plus other module issue I would say. Granted it can be done and be fun and interesting to see done but more than simply engine and transmission swap. Unsure of issues with OBDII and 2007 Can-Bus interfaces.

Brian

GM changed the wiring in a big way in 2003. Since yours is a 2002, you are kind of stuck. I would just start setting aside money now, and when something goes out, just upgrade/hop up your engine and transmission. You'll end up with more power than the '07, and probably for much less money. You could even pick up an engine/transmission combo and start building them on a stand, and when the time comes it'll be plug and PLAY!

Just my $.02

You can do it, but why??? With all the time and money you would spend on that swap you could easily do any motor/trans work to your LB7/5speed.

Same thought here. A simple Alli upgrade and refresh should take care of any worries. Injectors many be an issue, but it still beats a motor gen swap.