Originally Posted by HoustonHemi
There's more to the 8 speed than just starting out in lower gears and better spacing between the gear ratio's,,, (better as in smaller steps between ratios, and those steps are all more equal/consistent than those in the 6 spd)
There's also less parasitic loss with the 8 spd in several gears, including "8th".
Would it be worth an extra $1,000? Eh, dunno. Probably depends on your situation.
Equal money 6 vs 8? I'd wait, but again, everyones situation is different..
I've attached a link to a SAE review of the Thermal Mangement System for your review.
It sports some pretty impressive comparisons abut how they're achieving fuel improvements.
One thing that will help everyone is the "Active Shutters" that come with (and only) 8 speeds.
The areo difference which we'll really see on the highway justify's for me the $500 add.
At the same time if dealers are trying to move things faster and discounting 6's even more that's another issue.
By the was the ZF8hp70 has been in standard production for 2 years now. No risk there.
Good luck just another input.