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SECTION 4 BODY MOUNTING
INTRODUCTION
This section has been designed to provide guidelines to aid in body mounting. This is not intended as a complete guide,
rather as general information. Body mounting strategies are unique to each body type and body builder must determine
the appropriate method.
Please contact your local Peterbilt dealer if more information is desired.
FRAME RAILS
Frame rail information is provided per rail.
TABLE 4-1. Single Frame Rails
Rail Height
(in.)
Flange Width
(in.)
Web Thickness
(in)
Section
Modulus
(cu. In.)
RBM (per rail)
(in.-lbs)
Weight (per rail)
(lbs/in.)
10 5/8
3.45
0.313
14.8
1,776,000
1.44
10 3/4
3.50
0.375
17.8
2,136,000
1.74
11 5/8
3.87
0.375
21.4
2,568,000
1.91
TABLE 4-2. Built-up Frame Rails
Main Rail
Height
(in.)
Insert
Outsert
Section
Modulus
(cu. In.)
RBM (per rail)
(in.-lbs)
Weight (per rail)
(lbs/in.)
10 5/8
9.875 x 2.87 x .250
None
23.6
2,832,000
2.48
10 3/4
9.875 x 2.87 x .250
None
28.9
3,468,000
2.78
10 3/4
9.875 x 2.87 x .250
11.63 x 3.87 x .375
45.7
5,484,000
4.67
(1)
11 5/8
10.75 x 3.50 x .375
None
37.7
4,524,000
3.65