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Joined: Apr 2005
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OP
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Wondering about the floor pan bump, a domed hump about 5 inches in diameter at the center and about 7 inches from the rear edge on '46 trucks (1/2 ton). Anyone know the purpose? Clearance for torque tube and transmission don't appear to be a factor.
Last edited by 37Blue; 04/01/15 08:14 PM.
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Joined: May 2002
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If there was a 4wd option it may be to allow clearance for transfer case.
Tony
1938 1/2 ton Hope to drive it before I retire
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4WD may have been an option I'm unaware of. If so, my guess is there would have been so few sold that production-wise it would have been more cost effective to modify the few units sold (comparatively) and needing the modification.
It seems odd the feature would be added without a purpose or reason.
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Joined: Sep 2012
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Grease Monkey
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Grease Monkey
Joined: Sep 2012
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The bump you mention is only on the 4 speed floor pans. I just removed my 4 speed to replace with a three speed and the three speed pan is flat.
David
1937 GMC panel delivery
1946 GMC 1/2 ton long bed
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Thanks, Bogart. I found my '29-'48 Master Parts Catalog, finally. Strangely, it indicates the only difference between the floor pans for 3 vs 4 speeds is the cut section for the shifter, a round hole vs a square one. In checking the drawings provided in the catalog there doesn't look like there is any thing aft of the gear shift protruding upward with the 4 speed that would require additional clearance such as the domed 5 inch (approx) diameter section compared to the 3 speed. It seems the mystery continues.  :
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Could your tran. be removed from the top like in my '36? In place of dropping out from the bottom?
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Joined: Apr 2005
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It sure looks like there is more than enough clearance to do it that way.
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