New Crown and Pinion Break In Warning

A new crown and pinion installation, especially a high numeric ratio with new bearings, can cause an excessive heat buildup in the rear end and cause softening of the gear teeth and bearings if a break in is not performed.  To break in the new crown and pinion perform a run-in prior to driving in high gear for a minimum of 15 minutes, then let it cool.

Street vehicles should next to driven at normal street driving speeds for approximately 15 to 20 KMs, then stop and let cool for 30 minutes.  Do this 2 to 3 times.

Towing vehicles need approximately 500 to 700 kms of normal street driving before being used for towing. 

On circle track race cars make approximately 6 to 8 laps at slow speed, and then let cool for 30 minutes.  Make 6 to 8 more laps at slow speed, then 2-3 laps at full speed, and then let cool again for 30 minutes.

Drag cars need only an initial run-in since they are driven short distances and heat is not normally a problem with proper lube and backlash allowance.

Note:  If after the above break in is performed, overheating of the rear end is suspected, repeat the final portion of the break in procedure.