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03' to 06' interchange?

Question: 
2K views 4 replies 3 participants last post by  Pannell LLC 
#1 ·
I have a 06 gm 2500 6.6. Trans messed up and I found a 03 Trans. Are they interchangeable?
 
#2 ·
Welcome to DieselPlace
Any mods with your 06'?
 
#4 ·
Isn't the '06 a 6-spd? The '03 is definitely a 5-spd.
 
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