Location: Ignacio Colorado
(174.125.141.216) | Frank, I have not put the overdrive into the FMC at this point. I have brought together what I (reads TEAM) thought was the best and easiest way to put an overdrive into the FMC. I was the transmission guy in the team and much of the credit will go to another for fabricating many pieces required to make the 4 wheel drive version of the Chrysler 46RH overdrive work in the very limited space of the 2900R coach.
This transmission does have the park pawl and a park position. The transit I have with the Allison, as well as the other 440/Allison and 8.2 Detroit/Allison units do not have a park pawl and a positive park. They use a drum style park brake similar to the one on the stock Chrysler 727.
The overdrive is 0.69:1. If you currently run 3,200 rpm cruising then with the overdrive it should be down to 2,200 rpm. The overdrive can be built with or without a lockup converter. With a lockup you could shave off another 200 or so rpm.
My plan will include engine work to get the most torque in the lower rpm range without having to build a stroker engine. The goal is to get the best fuel economy, drivetrain longevity, with the least modifications to the coach. Use the best parts Chrysler made for the job at hand. This is not going to be a drivetrain package ever put together before. As I said in an earlier post, there are at least 2 FMC's already running the Chrysler overdrive transmission. The engine that is planned for this setup has never been done. We think it will prove a very dependable combination. When I have one running I will give real driver seat data. Bill
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