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What's better mpg? C-6 w/ GV OD or a ZF5

2K views 2 replies 3 participants last post by  outsidebear 
#1 · (Edited)
Alright, I have seen several threads about what is better, the C-6 or the ZF5? Obviously, this is going to depend on several factors: your gearing, what you intend to use the truck for (towing or daily driver).

Why am I asking?....
I have just recently dove into the idi world, and like all of you, I am in love with the dependability and the easy work. I have the c-6 and I have been looking at all my options for the drivetrain. I am finding the c-6 to be a great affordable tranny; but, I really like the idea of swapping out my c-6 auto for a ZF5 5-speed. I also am willing to look at the option of adding an extra 3 gears w/ a gear vendors overdrive unit.

(GV OD cost ~$3,000)
(ZF 5 speed used ~$500-$1200)

I only use my truck to for an occassional sunday drive (1-2 times week) and when I need the work horse to go haul the boat or some gravel or the m/c toys. I would love to drive a 5 speed when I am pulling a load.

What I am looking for is which of the two would give me the best fuel economy? If you did this swap, any major obstacles you ran into? And feel free to share anything else you think I should consider when comparing the two trannys...

p.s. if you tell me your fuel economy PLEASE SHARE YOUR TRUCK INFO (turbo or N/A, which tranny, your gear ratio, size tires) and I am not comparing just a C-6 and a ZF5! I AM COMPARING A C-6 w/ GVOD AND A ZF5.
 
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