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The B-53 was a weight saving mixer chassis that would be the forerunner to the DM model.  Usually had a heavy Rockwell front axle, power steering and a fish belly frame.

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2 hours ago, j hancock said:

The B-53 was a weight saving mixer chassis that would be the forerunner to the DM model.  Usually had a heavy Rockwell front axle, power steering and a fish belly frame.

Dont you mean the r model. Thought the b57 was the forerunner to the dm

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56 minutes ago, GreenGiant2 said:

Don't you mean the r model. Thought the b57 was the forerunner to the dm

Both the B-53 and B-57 were heading in that same general direction.  The B-53 had the fish belly frame and the B-57 used a straight frame behind the cab.

The BBC for the B-53 was 108" (same as a B-61) and the B-57 was 101" (same as a B-67).

2,625 B-53 models were built between 1962-1966.

281 B-57 models were made between 1964-1966.

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It looks like mack B's never came close to Whites coup cab 92 inch BBC. That was there big selling point. I believe the white A cab 9000 was also 92 in BBC. Those were cramped cabs.

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1 hour ago, james j neiweem said:

It looks like mack B's never came close to Whites coup cab 92 inch BBC. That was there big selling point. I believe the white A cab 9000 was also 92 in BBC. Those were cramped cabs.

The B-67 with the flush mounted bumper and contoured cab featured a dimension of 89". 

The measurements I used up above was for the standard bumper and flat back cab panel for straight truck use.

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On 8/22/2019 at 3:53 PM, james j neiweem said:

It looks like mack B's never came close to Whites coup cab 92 inch BBC. That was there big selling point. I believe the white A cab 9000 was also 92 in BBC. Those were cramped cabs.

I think the White was a high cab short conventional or low cab forward, and would be compared to a Mack C model.

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