Specifications

Introduction
The intent of this document is to provide both reference information and guidance for getting
the Chevrolet P Chassis to perform as it was designed to perform.
A majority of the information is taken from the 1995 and 1997 “Chevrolet Motor Home Chassis
Service Guide” for the P Chassis. However, the information has been presented in what is felt to
be a logical sequence to accomplish that most elusive item for this chassis – good handling.
Age is the common enemy of the chassis. It has been around a long time and many of the older
motorhomes on this chassis are showing signs of age. The idea here is to simply get appropriate
repairs done to bring the chassis back to reasonable condition and then figure out the correct
specifications for alignment.
Along the way, you have probably encountered your share of not-so-competent mechanics
and/or alignment shops. Matter of fact, many alignment shops simply don't know how to deal
with this motorhome version of the P Chassis and wind up treating it like a truck.
We will show you that simply telling the alignment shop that it's a “P30 Chassis” will almost
guarantee you an incorrect alignment. Your Class A motorhome is NOT built on a “P30
Chassis”. The correct general term is a “Motorhome P Chassis”. The P Chassis was also used
for what is referred to as a Commercial (Forward Control) truck. The same chassis series has
been used for G10, G20, G30, P20, P30, and Motorhomes under a '32 - 52' designation. What's
more, the alignment specs are different for the motorhome chassis because they were made
slightly different.
If you decide to do some of the repair work yourself, such as replacing bushings, remember that
you can generally 'rent' specialty front end tools from your local parts store at a cost of $0.00
when you buy the parts from them. A deposit is all that is generally required. You can probably
get some good instructions on safely using the tools too.
Chevrolet had 7 model numbers for the Motor Home P Chassis, only the ones with '-52' were
destined for Class A motorhomes. Class C motorhomes were also built on some of the
Commercial truck chassis.
P30832 125” wheelbase
P31132 - 52 137” wheelbase
P31432 - 52 159” wheelbase
P31832 - 52 178” wheelbase
P31932 - 52 190” wheelbase (Start-up production in 1991) (19.5” wheels)
P32032 - 52 208” wheelbase (Start-up production in 1988) (19.5” wheels)
P32132 - 52 228” wheelbase
http://users.sisna.com/cebula/P-Chassis-AlignmentProcess.pdf 2 Version 0.7 –Sep 14, 2005