M109 Self propelled gun info needed

[rob love]

When I check the parts manual for the ARV, the transmission pack is referred to as "M109/M578", so perhaps it is not much more than a change of the flanges. It is going back quite a while but I remember some differences in the generator or cooling systems between the two.

[Malcolm Towrie]

On the attachment in post 39, what is the "throttle shaft" for on the tranny? Engine load input?
Malcolm

[rob love]

Possibly similar to the kickdown cable on many transmissions. It might keep the transmission in the lower gear when under high load/maximum throttle, or might kick down the gear under similar circumstance.

[David Herbert]

Or it might be that it is part of the throttle linkage to the engine and from the pedal.

David

[rob love]

According to the online manual I referred to earlier, the throttle lever acts on the throttle valve and the throttle regulator valve.

[Malcolm Towrie]

As far as I know, any automatic transmission needs to know engine load so it can short shift, downshift, increase shift pressure, etc. I suspect that shaft is interconnected with the engine throttle linkage to give that input.

John, if you go ahead with the project, best thing to do is get a hold of the original interconnected throttle linkage if you don't have one.

Malcolm

[jdmcm]

I would love to Malcolm but spares for these things are hard to find, so far I cant even find the output flanges, any US suppliers fall all over them self crying "ITAR" and wont even speak to you about parts...I am going to have to get "lucky" with a monument vehicle and be in exactly the right place at the right time I fear

John