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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Oct 2001 Posts: 3,458 Extreme Gabster | | Extreme Gabster Joined: Oct 2001 Posts: 3,458 | I have what either looks like a factory bump or a very well hammered bump in my cab floor, centered side to side and just forward of the transmission pan where it slopes upward. It looks like it might be for clearance for the foot stomp starter mechanism but I'm working on repairing the cab and I can't tell. Does anybody else have a bump there? Its slightly smaller in diameter than a golf ball and hemispherical.
Paint & Body Shop moderator
A lone amateur built the Ark. A large group of professionals built the Titanic. | | | | | Joined: Jun 2005 Posts: 1,756 Shop Shark | | Shop Shark Joined: Jun 2005 Posts: 1,756 | I had one like that on my big toe.  | | | | | Joined: Mar 2006 Posts: 1,703 Shop Shark | | Shop Shark Joined: Mar 2006 Posts: 1,703 | I got one on each little toe from Steel Toe boots we have to wear now ..in SAFETY'S SAKE.
Now to be serious sorry cant help my floor is Totally flat ..1/8" steel plate welded in over my floor & aoutomatic trans. | | | | | Joined: Oct 2006 Posts: 9,671 'Bolter | | 'Bolter Joined: Oct 2006 Posts: 9,671 | Yes, about an inch in diameter bumped out about a 1/4" or so and at about 270° and 4" from the foot stomp. It's for clearance of the bolt or screw that hold the cover on the inspection hole. I've never figured out what you would be inspecting up there on the top of the bellhousing under the fire wall. The only way you would ever get into it is when the engine is pulled out.
Denny Graham
Sandwich, IL
Denny G
Sandwich, IL
| | | | | Joined: Oct 2001 Posts: 3,458 Extreme Gabster | | Extreme Gabster Joined: Oct 2001 Posts: 3,458 | Thanks, Denny, that's exactly it. I completely forgot about that little cover. That cover allows you to get at the freeze plug on the back of a GMC engine without removing the bellhousing but since you have to take the engine out anyway I'm not sure how much good it really does, except to give your hand a sharp edge to scrape on when you are pulling the bolts.
Paint & Body Shop moderator
A lone amateur built the Ark. A large group of professionals built the Titanic. | | | | | Joined: Oct 2006 Posts: 9,671 'Bolter | | 'Bolter Joined: Oct 2006 Posts: 9,671 | Well I think you'd be hard pressed to get at the freeze plug with the transmissinon, clutch disc, pressure plate and flywheel in the way.
Denny Graham
Sandwich, IL
Denny G
Sandwich, IL
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