C-6 vs. AOD

[mcne]

My prerunner is a street truck. I would like to have overdrive. What are the pros and cons of swapping out my C-6 for an AOD? How does an AOD hold up in offroad driving compared to a C-6?

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[ntsqd]

The AOD can be a stout piece. It has a few weakness' that need addressing though. I replaced a C-4 with one. That OD ratio is REALLY tall. Baumann Engineering used to be on the cutting edge of AOD development and may still be, search them out.
I know some would consider it sacriledge, but I would probably go with a 700R4 instead. You can buy one tricked out & ready to install for enough less than what a built AOD will cost you, and with that savings you can easily pay for the adapter plus have some lunch money. The 700 has a lower first gear and a not quite so tall OD. Have a look at 700R4.com

[mcne]

Thanks for the info. What is wrong with a really tall overdrive? That means I can run lower gears and still have decent rpm's on the highway?

[murphco]

whats firt gear on a 700r4? first gear on my aod is 2.46.its actually a 4r70w but they are basiclly the same thing.anybody set one of the 4r70w's for paddle shift,i'd like to do that.

[jamesjones]

3.06

[ntsqd]

[ QUOTE ]
Thanks for the info. What is wrong with a really tall overdrive? That means I can run lower gears and still have decent rpm's on the highway?

[/ QUOTE ]

It's a .675:1 OD ratio. At 3200 RPM in direct shifting to OD put me at about 1900 RPM. If your engine has the grunt to pull that it could work. The 700's OD ratio is more like .7:1-.75:1 which means you won't be as likely to fall off the bottom end of your power band.

[IanDixon]

I had the AOD transmission behind a 5.0L engine in a Ranger with 33� tires and 4.56 gears. I didn’t like the overdrive at all. You couldn’t stay in OD even on the freeway.

After reading the baumannengineering.com website about the AOD, it looks like you should think about a 4R70W transmission for overdrive.

[steveG]

Lentech builds super-strong AOD trannsmissions. I'd give them a call before making a decision.

[Ando]

OD on the 700R4 is .70 to 1, so not too much different from the AOD. Big question is, are you going to run a lock up converter or not? Both the AOD and the 700 use lock up converters and both will have to be modified pretty extensively if you are not going to use the lock up, alternatively the transmissions will both have to be wired for lock up control.
700r4.com has really good prices on quality transmissions.

[ntsqd]

Au contrair, the diff btwn .7 and .675 is huge in practice, if not in numbers. The difference to look at is how much RPM drop there is btwn direct and OD and where your engine's power band is. To not lug the engine I had to wring that 302 out a little b4 letting it shift into OD.

The AOD (not the 4R70W) uses a hyd lock-up. No re-wiring possible. Maybe with some non-stock parts?
If you're not using the lock-up in OD why even bother? I know of some people who use the locked/unlocked t/c in the 700 as a fifth 'gear', but only when getting rolling - not unlocked in OD in steady state cruise.