Tomdamit@aol.com wrote:
>
> Is the overdrive ratio the same in all the Dakota V8 automatic transmissions?
> Would be nice if the factory gave a higher ratio for the the O/D they put in
> the trans with a 3.90 gear as opposed to a lower one with the 3.55. Once the
> trans went into O/D, the gas mileage would improve although useable power
> would fall off. Anyone with a shop manual or other information?
> ---------------------
> Forwarded message:
> From: WillTier@aol.com
> Sender: owner-dakota-truck@buffnet4.buffnet.net
> Reply-to: dakota-truck@buffnet.net
> To: dakota-truck@buffnet.net
> Date: 97-10-26 08:57:49 EST
>
> In a message dated 97-10-25 01:34:02 EDT, you write:
>
> << 5. possible switch over to 4.10 gears >>
>
> I don't know about the 4:10 gears, I have the 3.90 and on juice am running
> close to 6000 rpm at the end of 1/4 with the OD locked out. They say the OD
> unit is the vulnerable part of the tranny and I don't want to have to use it
> but with 4:10 gears I'm sure you would have to or even with the MP computter
> you would hit the rev limiter. I was told 4:10 would increase rpm by about
> 800 ? I'm not interested in turning many more rpm but maybe a little more
> power on the way up there whcich I hope would cut my time maybe even lower
> MPH a little but not get the revs up 6000.
>
> Bill
By what my service manual('92 model) says, the overdrive ratio is the
same for all automatics--.69:1. That goes for both V6 and V8. I don't
know if it has changed since then.
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