B&M Dana 80 User Manual

Figure 1

Axle housing
fill plug

Instructions

Cast Aluminum Rear End Cover for

Dana 80

(see www.bmracing.com for the latest vehicle fitment applications and model years)

Part Number 10315

© 2013 by B&M Racing and Performance Products

This B&M Cast Aluminum Rear
End Cover has been designed to
work on most vehicles equipped
with a Dana 80 style axle. The B&M
Cast Aluminum Rear End Cover
provides several advantages over
stock factory covers. The extra
capacity provides increased oil
volume and added cooling, while the
thick aluminum construction
increases case rigidity. The
reinforced center bar, along with the
load bolts, prevents bearing cap
deflection under severe loads. The
magnetic drain plug feature allows
regular gear oil changes without the
usual mess, and limits ferrous debris
from circulating in the axle.

INTRODUCTION

This rear end cover can be installed
in about an hour by carefully
following the instructions. It is
suggested that the vehicle be
allowed to cool off for a few hours to
avoid burns from hot oil and parts.
The vehicle should be off the ground
for ease of installation - jack stands,
wheel ramps or a hoist will work
fine. MAKE SURE VEHICLE IS
FIRMLY SUPPORTED - DO NOT
WORK UNDER A VEHICLE IF IT IS
SUPPORTED BY ONLY A JACK!
Try to raise the vehicle 1-2 feet so

you will have plenty of room to
work. Also, have a small box to put
bolts in and a drain pan to catch
oil.

INSTALLATION

STEP 1. Clean axle housing cover

area from dirt and other debris.

NOTE: On some vehicles it
might be necessary to remove

some parts (e.g. sway bar,
panhard rod) to make the
installation of the cover easier.
STEP 2. Place a drain pan

underneath the axle housing.
STEP 3. Loosen the axle housing fill
plug with a 1/2” square ratchet (See

Figure 1).
STEP 4. Remove all the bolts

except one at the top. Loosen the
remaining bolt but do not remove.

Printed in the USA 9500894-00

STEP 5. Carefully pry the cover

Figure 3

Figure 2

Axle housing

surface

Load bolts

loose with a flat head screw driver,
being careful not to damage the
surface, and allow the oil to drain.
STEP 6. Remove the last bolt and
the cover once completely drained.
STEP 7. Using a dry lint free rag,
clean the accessible areas of the
axle housing and check internal
components for visible excessive
wear or other problems.
STEP 8. Clean all gasket material
from the axle housing surface (See

Figure 2).
STEP 9. We recommend running a

3/8”-16 tap through each threaded
cover hole on the axle housing to
ensure an accurate torque on all
bolts.
STEP 10. Install the supplied load
bolts in each boss from the inside of
the B&M Cast Aluminum Rear End

Cover until they bottom out (See
Figure 3 & 4).
STEP 11. Apply a bead of RTV
silicone gasket maker to the B&M
Cast Aluminum Rear End Cover.

Run the bead inside the bolt holes

(See Figure 4).
STEP 12. Install the B&M Cast
Aluminum Rear End Cover on the

axle housing using a supplied bolt
and washer at a bottom hole on the
cover so it can be used as a guide.
STEP 13. Install the rest of the
supplied bolts and washers and
torque to 25 ft/lb in a crisscross
pattern.
STEP 14. Screw in the two load
bolts by hand until they touch the
bearing caps. Torque the load bolts
to 5 ft/lb max.

NOTE: Do not over torque the
load bolts as you run the risk of
distorting the bearing caps,
creating abnormal wear and
premature failure.
STEP 15. Apply a very small amount

of RTV on the threads of the load
bolts and install on the two supplied
jam nuts on the load bolts. Torque
the jam nuts to 5 ft/lb.
STEP 16. Install the supplied
magnetic 1/4” NPTF drain plug on
the B&M Cast Aluminum Rear End

Cover and tighten (See Figure 5).
STEP 17. Fill with factory

recommended gear oil using the

B&M Cast Aluminum Rear End

Cover fill plug hole (See Figure 5).

Add gear oil until oil runs out of the

B&M Cast Aluminum Rear End
Cover fill plug hole.
STEP 18. Install the supplied 1/2”
NPT fill plug on the B&M Cast
Aluminum Rear End Cover and

tighten.
STEP 19. Install and tighten any
other parts (e.g., sway bar,

panhard rod) if removed.

Owner’s Manual/Maintenance
Booklet recommends replacing
axle lubricant anytime axle is
submerged in water. (Refer to

Owner’s Manual/Maintenance

Booklet for details).