Til its completely cool. When I had mine done though, I drove pretty good distance home on it, just don't get stupid and romp on it. Ideally its best to drive like 1 heat cycle for about an hour, and then let it cool for a coupla hours. Repeat this, and then do a few short 20-30 minute trips and let cool for a few hours each, and then beat on it.

 

Well, really there is no set in way to break them in. Different places will tell you differently. I had the work done at HPE on mine and drove them home from there to Alvin, which is probably about 40-50 miles=1 hour. I didn't get over about 60 mph though either. While you are breaking them in just don't romp on it any. No performance driving until you have done at least 3 or 4 heat cycles. In my case I drove home and let cool for about 2 hours, and then did about 3 or 4 more little 15-20 minute heat cycles and let cool for about an hour each, and then, gave em hell.

 

I hope I didn't mess anyhting up. The place that installed mine said not to worry about it..........but at least they gave me a 12k warranty parts and labor.

 

Different set-ups heat differently. The more preload you put on the bearings the more heat you will get. Tons of cars have been driven hard without being broken in without problems, but there are also many that have ended up with blue bearings and soft gears.

 

The t/a cover will be installed too which preloads the bearings so that factors in to the heat build up right?

 

Not really. It preloads the bearing caps more than the bearings. Plus the aluminum and extra fluid capaciy helps shed some heat.