Does this sound right?
 

I have my car in getting new shafts, bearings and Richmond 3:55s put in. They got the parts today and said they are still working on it. The fishy part is that he says they have to break them in. He told me that they have to take the car out warm it up and bring it back and let it cool a couple of times. Is this true or is the guy out cruzing my car.:mad:

they are correct. you have to break in the new gears so they seat correctly. i also think it makes the gears a little stronger this way, but dont quote me on it.

gears break in
 

They really only need to take it out once to make sure everything is meshed up correctly, etc. But yeah, there is a bit of a break in period I believe. When I got my gears put in (years ago) the shop told me not to really beat on it for a hundred miles or so.

when i have my gears installed they tell me to jolt the car a little bit to make sure everything is seated ok. not a 5000 rpm launch or anything, just a little pop the clutch at 1500 to give it a jolt.

I've heard you have to break in new gears as well and not to beat on them initially. I've heard that when you first get gears that they are hardened and if they are shocked they are more likely to crack or chip. Once you heat them up they lose part of their tempering and are slightly softer and start to develop the tooth contact pattern and also have more give to them when you really beat on them. That's why you hear about drag racing gear sets not being suitable for the street, they're so soft they wear out really quickly(within several hundred miles) but can survive harder launches and not break.