Hello group,
I have three questions regarding upgrades to the American Models GP mechanism.
First question is about the low speed worm that is available from AM: will it
work with older AM GPs? I had assumed that it would work on all AM diesels, but
when I called Ron at AM and asked this question (noting that all of my GPs were
purchased prior to 2000), he said the low speed worm would probably work in
older locomotives, but that it might make them a bit noisy. He made reference
to the helical worm gear used in the older drives being a factor.
I'll be giving AM another call for some clarification, and probably will buy a
couple of low speed worms to try out. It seems that if in fact different types
of worm gears were used at various times in the production of these models,
then the replacement worm would be well suited to one type, but not the
other(s). Does anyone here know if the worm gears are different in older and
newer models, and whether or not the low speed worm will perform properly in an
older unit?
Next question: Are U -joint drives preferred over the pen springs supplied with
some of these models? I have both types, and the pen spring drives seem to work
okay, but I suspect there could be some benefit to replacing them with the more
conventional U-joint drives such as those available from AM.
Just one more question (for now), regarding the NWSL replacement geared wheel
sets for the GPs: They are only available now with code 88 wheels. As far as
appearance goes the wider treads on the AM (scale) stock wheels don't concern
me, and they seem to roll along on code 70 track without bumping on spike heads
or anything like that despite the slightly deep flanges. I assume that the main
advantage of the NWSL replacements is appearance, but I may be overlooking
something. I would appreciate any assistance you can provide to me. Thanks.
Will Quinn
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