I ran for 2 years with no lockup converter in my 700R4 car - it was fine - but it had 3.73's and a 2500rpm converter, it was running at or above stall speed on the highway so it wasn't building too much heat. If you've got a long gear (ie 2.73's) you'll heat things up a lot quicker - especially with a non-stock higher stall converter. Again, if you've got a good tranny cooler, you should be ok.
Originally Posted by CamaroRacing12
do not drive it in overdrive with no lockup, it will burn the syncros in the transmission. driving it in 3rd gear "D" is fine tho.
Auto's w/ syncros? I'm guessing you mean the clutch-packs. If you run the trans hot enough you could start burning stuff up - running in drive if you're pulling a hill under stall speed without a lockup in overdrive is probably a good idea to keep things cool. It could be the brake switch, but I doubt it as they didn't monkey with that when the worked on the trans. They most likely just forget the plug to the rest of the wiring harness - I don't know where/what its like on a 4th gen as mine is an M6 - but my third gen cars were on the passengers side along the firewall, it would take 10 seconds to plug/unplug.