New Posi rearend with 3.73's.... Break in tips? - Chevy Nova Forum
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Old 18th-November-2009, 11:19 PM   #1
$Piker
 
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New Posi rearend with 3.73's.... Break in tips?

Well I just got my car off of the lift with all the new bushings and new rearend bolted up and I cant wait to stomp all over it! Before I do I read that I should let it have a few heat cycles? Suggestions?
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Old 19th-November-2009, 12:32 AM   #2
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Per Richmond gear!

BREAK IN

A new ring 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.

Street vehicles should be driven at normal street driving speed for approximately 10 miles, then stop and let cool for 30 minutes. Do this 2 to 3 times. Towing vehicles need approximately 200-300 miles of normal street driving before being used for towing.

On circle track race cars make approximately 6 to 8 laps at slow speed, then let cool for 30 minutes. Make 6 to 8 more laps at slow speed, then 2 to 3 laps at full speed, the 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 procedures.
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Old 19th-November-2009, 07:02 AM   #3
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Don't forget the final step, the 4-way intersection manuver complete with cell phone pictures
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Old 19th-November-2009, 07:58 PM   #4
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Quote:
Originally Posted by epfatboy View Post
Don't forget the final step, the 4-way intersection manuver complete with cell phone pictures
Haha Will do. Thanks Big Al. Right after I posted this I double checked my Richmond gear box and found the exact instructions. I also saw your run on pass time last night!
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