Bill, I also was unaware of the GP's having different gear ratios, but
I did know that he offered his Baldwin that way. I guess most of AM's
engines could be made that way since his power truck is seemlingly the same.
The motor changes over the years has been interesting to watch. I think
I have 14 AM engines from the original FP-7's to SD-60's and there must
be a half dozen types and sizes of motors. I've found most of the
engines run pretty well together, although I seldom run more than three
together. The wheel bearing issue also can be fustrating. I replaced
many of my driving axles with NWSL replacements. Sometimes they were
returned with the incorrect bearings, so I finally just sent in the
bearings my self from the old axles. Of course then I found that I
needed to add thin washers to make up for the Code 125 AM wheels
compared to the #110 replacements. If some of the wheels hadn't been
wobbling, it wouldn't have been worth the cost and effort.
I recall back in the 80's there was a lawsuit against GM. Seems that
they were swaping motors from there various brands ie. putting
Oldsmobile motors in Buicks. This normally wasn't a big deal until you
tried to find parts, so you ordered a valve cover for a 85 Pontiac but
you really needed one for a Chevy!
Bob Werre
BobWphoto.com
Bill Nielsen wrote:
>
>
> This is the first I have heard of different gear ratios for the AM
> GP9's. Since I purchased three used DC units with Hi-Rail wheelsets a
> couple of years ago and simply ordered new scale wheelset replacements
> which dropped right in (once I got wheelsets with the right style of
> bearings. I didn't know there were different ones from looking at AM's
> website), I now have more questions about the gears. Wouldn't changing
> the worm to get a different ratio also require changing the axle gear
> as well to match the new worm? Now I'll have to closely inspect all my
> GP9's to see if any of the gears are different. They all seem to run
> OK, and any speed difference I had thought was due to different types
> of motors being used by AM. I seem to recall my first Geep had a motor
> that was a tiny bit wider than the inside of the body shell, which
> caused the sides to swell out a bit, so I replaced it with a Sagami
> flat can motor. My FP7 came from AM with a round Sagami motor, which
> was not used in later production runs.
>
> Regards,
> Bill
>
> __
[Non-text portions of this message have been removed]
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