why break in new diff gear?
...... just making sure... 
Thread Starter
Registered User
Joined: Aug 2004
Posts: 5,749
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From: Santa Monica-SoCal
c'mon guys, i still haven't gotten an answer for this. the gear teeth fit snuggly together. what would be different 500 miles from now? the diff shop didn't say to change the dif oil out after 1000 miles either.
Joined: Sep 2004
Posts: 8,106
Likes: 2
From: PNW
If it's a brand new gear, the heat cycles might allow all parts in the diff to get used to each other. Yes they fit fine, but this couldn't hurt. I would just go easy on it. Changing the fluid in 1000 miles would let out any metal particles or tiny debris that were shaved off during this period.
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Joined: Aug 2005
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From: Ft Myers<hurricane alley>
This is from the Richmond web site pdf of how to install their ring and pinion sets.
http://www.richmondgear.com/ringandpinion.pdf
I had to type in some phony info to get to the download page.
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 to 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, 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 procedures.
http://www.richmondgear.com/ringandpinion.pdf
I had to type in some phony info to get to the download page.
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 to 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, 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 procedures.
Thread Starter
Registered User
Joined: Aug 2004
Posts: 5,749
Likes: 1
From: Santa Monica-SoCal
just talked to the shop again to reconfirm.
they said 2-3 heat cycles, then give it all hell.
they also said no need to change diff fluid until the honda rec of 10-15k miles.
can someone explain what "backlash" means?
they said 2-3 heat cycles, then give it all hell.
they also said no need to change diff fluid until the honda rec of 10-15k miles.
can someone explain what "backlash" means?