When you said 4 speed, I assumed you meant stick, not Hydra-Matic.
Anyway, sounds like yours should be identical to mine. The GM
part number is 1563901 and also stamped on the case is "18 - 14"
which are the number of teeth on the input and output gears. The
bad news is that Tom doesn't have one of these.
-----Original Message-----
From: Greg O. Pace [mailto:59gmc@bigriverbroadcasting.com]
Sent: Monday, April 02, 2001 10:32 AM
To: oletrucks@autox.team.net
Subject: [oletrucks] Thanks for speedo help! More info. . .
Sorry about not having a subject line in my original post. It was getting a
bit late.
More info for speedo gear reducer. . .
Truck is stock (GMC 100). It's not nearby, so this info comes from the shop
manual.
Optional transmission (4 speed) is mod. 177CA
Rear end is Spicer SP45 (3.07)
Wheels/tires are stock size (16s?)
I realize tire size affects the speedo calculation, so if anybody has a
chart for this please include info for a size up and down from stock.
I'm just beginning the resto and want to stay pretty much stock. The truck
has a flat bed built by my grandad in the early 60's. Other than that, it's
stock.
Thanks again
GOP
'59 GMC 100
'60 Caddy Conv.
'66 T-Bird TL-Q
oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
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