B&M FLEXPLATE User Manual

Installation Instructions

Chrysler Flexplates

Part Nos. 10230, 10231, 10234, 10235, 10236,

10237, 10238, 10239, 10241, and 10242

©1991, 1999, 2001 by B&M Racing and Performance Products

CAUTION: Please read the fol­lowing information before in­stalling your B&M flexplate.

Engine to transmission
alignment is normally not a prob­lem in low to medium perfor­mance applications with origi­nal equipment engines. How­ever in applications were the
crankshaft to block dowel pins
dimension has changed be­cause of line boring, serious
problems can develop. B&M
flexplates are designed prima­rily for high performance appli­cations and will perform satis­factorily as long as the engine
to transmission alignment is
within .008" Total Indicator
Reading (TIR). Installations
which exceed this amount of
runout can result in a worn con­verter hub bushing, leaking front
seal and cracks in the flex plate.
If you are installing this (or any
other) flexplate on anything
other than an original factory

installation we strongly recom­mend that you check the engine
to transmission alignment.

Since the Torqueflite has a
wrap around bellhousing align­ing the block to transmission
must be done with the transmis­sion case empty. Rigidly attach
indicator to crankshaft and indi­cate on the oil pump bore in the
case. Alternatively you can use
a manual transmission bell­housing to indicate runout. The
TIR is a relative measure of
crankshaft to transmission
centerline eccentricity.

A Total Indicator Reading
exceeding .008" can be cor­rected with offset dowel pins.
An offset dowel pin will produce
a TIR change that is double the
dowel pin’s eccentricity. To cor­rect a particular case; select a
pair of offset dowel pins that are
nearest to one half of the TIR.
Install both dowel pins with their
slots parallel to each other and

aligned in the proper direction
to correct the eccentricity.

Offset dowel pins are avail­able from Mopar Performance
dealers in three different offset
ranges:

Offset Chrysler P/N

.007" P4120383

.014" P4120383

.021" P4120383
For Total Indicator Readings

from:

.009 thru .020 use .007 dowel
.021 thru .034 use .014 dowel
.035 thru .050 use .021 dowel

NOTE: All dimensions given are
in inches.

Once you are sure the en­gine and transmission are prop­erly aligned install flexplate and
torque bolts to the factory speci­fication for your particular en­gine.

Printed in the U.S.A.

9500467-02