8300 North Austin Avenue · Morton Grove IL 60053 · 847-663-1701 · Fax 847-663-1702 · www.strangeengineering.net

Installation guidelines for all Strange Engineering 9 inch Ford center sections.

Before you begin installation: Read these guidelines thoroughly and save for future reference. If after reading these installation guidelines, you have any questions or comments, please do not hesitate to call us.

1.) If your 9 inch has a clutch style limited slip differential installed you must add two bottles (4 fl. oz.) of limited slip additive during the break-in procedure. This fluid is a friction modifier that reduces clutch chatter in the differential pro-viding smoother more consistent operation. 2.) The 9 inch requires approximately 2-1/2 quarts of gear oil. This will vary depending on housing style. Non-synthetic SAE 85W-140 gear oil is recommended for drag racing applications and non-synthetic SAE 80W-90 gear oil is recom-mended for street applications. 3.) Break-in procedure for street gears: No harsh acceleration! Drive the vehicle 50 miles then allow a 1/2 hour for the differential to cool down. Repeat this sequence for a total of 250 miles. At 1,000 miles remove the center section, fully clean the inside, seal the center and reinstall. Add only one bottle of limited slip additive and 2-1/2 quarts of gear oil.

JET NUT TORQUE30-35 FT-LBS.

LOCKING TAB BOLT TORQUE15 FT-LBS.

MAIN CAP BOLT TORQUE85 FT-LBS.

RING GEAR BOLT7/16" DIA. TORQUE TO 70 FT-LBS.1/2" DIA. TORQUE TO 85 FT-LBS.

PINION SUPPORT BOLT TORQUE35 FT-LBS. FOR ALUMINUM CASE45 FT-LBS. FOR IRON CASE

PINION NUT TORQUE200 FT-LBS. FOR 28 SPLINE PINION250 FT-LBS. FOR 35 SPLINE PINION