So, basically... high mileage isn't a problem for the engine... it's mainly the transmission and driveline?

 

No not really. It's a matter of how well it was taken care of. A 200,000 mile engine can be in better condition than a 20,000 mile engine if it was maintained and the 20,000 mile wasn't. So mileage doesn't have everything to do with it. As far as driveline, the rear-ends suck so you can break one anytime. The transmission wears out in automatics due to mileage, but mainly if it has been driven hard. The 3-4 clutch packs will go out from shiting hard into gear often. As far as the manual if you miss gears it will shorten the life incredibly. So basically a well maintained car will last a LONG time.

 

What's wrong with the rear ends?
Are there upgrades?

 

Man I only have 28k on my car. I'm real happy to hear that our Gen lll's are that durable! And our rear ends are very weak. Do a search and you'll find 100's of post's on the subject.

 

https://ls1tech.com/forums/new-ls1-owners-newbie-tech/361959-so-you-wanna-fast.html

see drivetrain portion of write up

 

100.000 on my 2002 z like new and still very strong i drive alot in
the summer 30.000 this summer thing still kicks ***. like new yet,
miles dont mean nothing to me, i had 3 gms and every one went 300.000
no motor problems. watch tranny tho. get out and drive i like to see
alot of f-bodies out there. till new camaro comes sounds like 07 gms web site pontiac solstis with detuned ls2 motor, cocept camaro at detroits
jan o5 show check it out..

 

118K on my 98 formy and still running 11's with bolt ons