Allison Transmission

[John Churchill]

--- In WanderlodgeForum@yahoogroups.com, "John Wyatt" wrote:
>
> --- In WanderlodgeForum@yahoogroups.com, "jburgessx2" wrote:
>
> I want to service my Allison transmission but was unsure which one I had. I
have the Bluebox paperwork but it lists two different model numbers: MT 644 and
MT 654CR. The paperwork states "up to 300 hp." I was sure this 6V92 was 330 hp
with the turbo. I don't believe the motor or tranny was changed - at least I
have no reason to believe it. What's the easiest way to tell which tranny I
have? Or, does it make any difference when it comes to the filters?
>
> Thanks.
>
> Jerry
> 85 PT40
> Port Hueneme, CA
>
>
> Hi Jerry,
>
> I used to own a 1984 ½ PT-36 with the 6V92 - 330 hp engine. That coach had an
Allison MT 654CR Transmission. The Internal Filter kit that I used was Allison
number 29502302 and the spin-on filter that I used was a Fram PH3519A. The
Allison MT 654CR Transmission is a 5 speed and I believe the Allison MT 644 is a
4 speed.
>
> John
> 91 40' WB
> Batavia, OH
>

All trannies and engines are marked with either a plate, tag stamped or cast in
info. The owner's or service manual should show where on the tranny to find the
spot with the model and serial # info.
For the filters, they may be the same if they are in the sane "family". You can
go online to a filter website or Allison and cross-reference between the models.
John Churchill
1980 FC33