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.
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?
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.
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.
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.
Do a smokey burn out and 2 1/4 mile pulls you will be fine. But for real when I put mine in drove maybe a total of two miles ate then I raced that night and they've been on for about 10000 miles no problems!
Im just going off what was posted by an AM rep who recommended about 200 miles of city driving along with 5 heat cycles, I bought their product so I'll just be cautious that little bit of time and play it safe...but thats just me your car, your gears, do what you want.
I was also told this at mustang direct where I got my quote. Metal expands and contracts with heat and cold, that's why I assume they are recommending the heat cycles at first to make sure everything seats properly. Coming from the ford factory everything will heat cycle together.
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.
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 $$$ to do it properly. BUT it may save you from having to redo the gear set because of noise and clunking.
When the factory installs the gears in the brand new car the gear set they use is exact tolerance and tested for any noise, vibration or defects on the final line.
When you take that gear set out and replace it with any other, The gears need to be fitted properly and may need shims to get all of the tolerances correct. It is not so much doing a heat/cool cycle as it is to let the gears lap in (SET) Even with a new car they tell you not to run a steady speed but to vary the speed for at least a hundred miles or more to allow the transmission gears and rear end gears along with a few other things to seat (Break in).
It's not like it costs you a bunch of $$$ to do it properly. BUT it may save you from having to redo the gear set because of noise and clunking.
Drive easy for a half hour. Let it cool off completely
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