View Full Version : What series gears??

04-19-2009, 06:12 PM
Hey guys Im new to the site and was wondering if anyone here can help me find out which series gears I need for my car. I am trying to buy some 3.73's and I have a 98 camaro z28, ls1 of course and the sticker on the door is missing so I dont really know how else to check the series I need. Any help? Thanks

04-19-2009, 06:26 PM
you a manual or auto? manuals only came with a 3.42 so thats a 3 series. autos came with a 3.23 (3 series) or 2.73 (2 series). if auto, check cruise rpm. if you are at 68 mph at exactly 2,000 rpms then you have 3.23s. if at 68mph you are somewhere around 1600-1700 you have 2.73s.

04-19-2009, 06:46 PM
Its an auto..

04-19-2009, 06:47 PM
How exactly do I check that?

04-19-2009, 07:04 PM
drive 68 mph on a freeway or simlilar road. look at your rpms. you will either be at 2000 rpms or about 1600rpms.

04-19-2009, 07:19 PM
Thanks I'll try that out..

04-19-2009, 07:41 PM
or check driveshaft.I've seen posts that 2.73s' got a steel driveshaft and 3.23s' got an aluminum driveshaft.

04-19-2009, 08:30 PM
^^^yes thats true as well. i believe all aluminum driveshafts are on the 3.23 auto and manual cars.