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Gear break in question.

3K views 50 replies 15 participants last post by  Six7One 
#1 ·
I'm going to go 3.73s very shortly but I might have a problem. The garage I'm going to is two hours away to get it done and I'm worried about the highway driving on the way back. There really is no way I can do the proper heat cycle for the break in. Any suggestions? The reason I'm going so far is because I'm getting a free install.
 
#4 ·
How much would it cost you to have it done locally? It comes down to how much are you willing to gamble. If it's around $200 for an install plus whatever the price of the gears, is it worth it?
 
#8 ·
Looks like Obama is screwing Canada also. Hope everything works for you.:thumb:
 
#11 ·
Most race car use a different rear then street cars

Originally Posted by tc x 4 View Post
If it's done right, everything will be fine. Do you think they baby race cars, I think not.
They usually use a "Quick Change differential" But the ring and pinions were usually seated in properly when not racing.

Every race car owner and driver I have known over the years have always seated in the rear end gears for at least 40/50 miles.

I did sponsor some race cars in the good old days and found that the guy's that did not do things right might have had fun racing but usually were always in the back of the pack or did not finish at all.



Ronnie
 
#12 ·
They usually use a "Quick Change differential" But the ring and pinions were usually seated in properly when not racing.

Every race car owner and driver I have known over the years have always seated in the rear end gears for at least 40/50 miles.

I did sponsor some race cars in the good old days and found that the guy's that did not do things right might have had fun racing but usually were always in the back of the pack or did not finish at all.

http://s410.photobucket.com/user/ronnie948/media/Bassett Racing/Number17_zps12a62216.jpg.html

Ronnie
I'm not talking about a circle track car. Go to a drag racing forum and ask the question. I think you'll find, they break the rear end in a 1/4mi at a time.
 
#24 ·
Heat cycles? What's this? When you bought your Mustang new, did you do "heat cycles" with the rear gearing it came with then? Why now?

Just get in and drive it home and enjoy the ride with the new gearing.
 
#40 ·
I picked up my mustang in 2011, drove it up to its current 51K miles on its odometer, and NEVER did any cycling with it. Drained the rear end fluid at 35K with RP (75/90; but I ocasionally track the car).

Never had any problems with the rear gears. Never heard of having to cycle them. If it was required, it would be in the owners manual as a requirement from the factory.
 
#44 ·
When installing a new gear set,

When the factory installs the gears in the brand new car the gear set they use is exact tolerance and tested for any noise, vibration or defects on the final line.

When you take that gear set out and replace it with any other, The gears need to be fitted properly and may need shims to get all of the tolerances correct. It is not so much doing a heat/cool cycle as it is to let the gears lap in (SET) Even with a new car they tell you not to run a steady speed but to vary the speed for at least a hundred miles or more to allow the transmission gears and rear end gears along with a few other things to seat (Break in).

It's not like it costs you a bunch of $$$ to do it properly. BUT it may save you from having to redo the gear set because of noise and clunking.

Ronnie:thumb:
 
#45 ·
When the factory installs the gears in the brand new car the gear set they use is exact tolerance and tested for any noise, vibration or defects on the final line.

When you take that gear set out and replace it with any other, The gears need to be fitted properly and may need shims to get all of the tolerances correct. It is not so much doing a heat/cool cycle as it is to let the gears lap in (SET) Even with a new car they tell you not to run a steady speed but to vary the speed for at least a hundred miles or more to allow the transmission gears and rear end gears along with a few other things to seat (Break in).

It's not like it costs you a bunch of $$$ to do it properly. BUT it may save you from having to redo the gear set because of noise and clunking.

Ronnie:thumb:
+1, well said Ronnie. It doesn't cost anything and may save you in the future.
 
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