Auto Transmission
Thread Starter
Instructor
Joined: Apr 2007
Posts: 206
Likes: 3
From: Erie PA
Auto Transmission
Hi all. considering a C-6 and was wondering about auto transmission, are there more than one automatic for the c-6 and if so what is the preferred one? Any and all help appreciated
Last edited by chevrolee; Jun 10, 2019 at 07:52 AM.
Racer
Joined: Feb 2018
Posts: 303
Likes: 72
From: Arizona
2005 had the 4-speed. 2006, indeed had the 6-speed. All the 6-speeds are identical with the exception of programming of the computer in later years to crisp up the shift timing. This can be done in the aftermarket as well.
Racer
Joined: May 2017
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From: Diamond Bar Ca.
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Le Mans Master
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St. Jude Donor '11
Oldtimer
That RPO code refers to the differential, not the gearing in the trans. Yes the earlier model A6's shift slower then the new models, but a tune for the trans will fix that. Mine is tunes and it shifts faster then the non-tuned and mine is an '07 A6.
Pro
Joined: Oct 2000
Posts: 616
Likes: 118
From: Alpharetta GA
2005 was the only year for the 4 speed. 2006-13 had the 6 speed auto. Since you are going used, I wouldn't even consider the 2005. Those 4 speed autos aren't known for their durability when going beyond stock power levels. Sure they can be built to handle power, but the 6 speed seems to be much more durable compared to the 4 speed counterpart. Most of my research is based on the full size truck platforms, but transmissions were basically the same across these vehicles.
Of course, my solution would be to forego the auto altogether, and get a 6 speed manual.
Of course, my solution would be to forego the auto altogether, and get a 6 speed manual.
Instructor
Joined: May 2016
Posts: 235
Likes: 21
ahhh after looking further you are right i learned something
what are the differences in differential ?
def agree on the trans tune mine greatly improved the auto behaviors
Pro
Joined: Oct 2000
Posts: 616
Likes: 118
From: Alpharetta GA
Rear axle ratio. Probably 3.23 vs 3.42. Numerically higher number means more engine RPM at a given MPH compared to a numerically lower gear. All things being equal, you can get faster acceleration because the torque multiplier (engine torque at specific RPM * transmission gear * rear axle gear) is greater.
Racer
Joined: Feb 2018
Posts: 303
Likes: 72
From: Arizona
