GMC started using clarks and spicers way before chevy, but they had
bigger trucks also.
Some 5 speed overdrives were available in trucks with the bigger engines
(360's etc).
Most used the larger "Deisel" type bolt pattern though. My '52 has an
overdrive 5th gear, but theres no feasable way to put that tranny in a
pickup. Actually it might be difficult just to haul that tranny in the
bed of a 3100!
--
John Dorsey
Wauchula FL
http://www.strato.net/~jrdorsey
'49 3800 Chevy Panel
'52 640 GMC Firetruck
Boteler Family wrote:
>
> Those old 5 speeds still only have a 1:1 in 5th gear (same as 3 or 4 speed
> high gears), so the only thing you gain is more shifting to get there and
> lower 1st gears....newer 5 speeds have 5th gear as OD.
>
> Chevrolet had the "New Process" 5 speed available starting in '56, then
> introduced "Clark" in '59 and "Spicer" in '62. Don't know when GMC started
> using Spicer.
>
> Mike Boteler
> '56 8400 Wrecker
> Hughesville, Maryland
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