[Z06] Differences between '02 and '04 Z's
Instructor
Joined: Apr 2007
Posts: 185
Likes: 11
From: Maple Ontario
Don't forget the transmission...the early 02's, like mine, have the aluminum shift fork(s). Since I don't force the shifter mine were fine at rebuild time; GMPP felt compelled to replace them during the rebuild.
The vehicles qualification for GMPP may be criteria you want to consider when purchasing. A four year, 32K plan set me back $1100...then the ECBM went...then the tranny. Transmission was not all that bad, but labor to take it out and look is well over 1K in addition to any work on the tranny. I wish my stock picks had the same kind of return on investment
The vehicles qualification for GMPP may be criteria you want to consider when purchasing. A four year, 32K plan set me back $1100...then the ECBM went...then the tranny. Transmission was not all that bad, but labor to take it out and look is well over 1K in addition to any work on the tranny. I wish my stock picks had the same kind of return on investment
Melting Slicks
Joined: Nov 1999
Posts: 2,372
Likes: 227
From: N Cal
Besides the new shocks, there are two other changes. Front, upper control arm bushings now use higher durometer rubber to reduce compliance. This increases front "camber stiffness" under high cornering loads, especially during hard cornering over chatter bumps. The increased camber stiffness makes the front end stick a little better so, to balance the car, a little rear end grip was added by increasing the compliance of the rear stabilizer bar mounts. This had the same effect as a slight reduction in bar diameter but was less costly than tooling-up a new rear bar.
Just a fact, 04's are the best of all C5 Z's. And as said before, buy the newest one you can afford.
Just a fact, 04's are the best of all C5 Z's. And as said before, buy the newest one you can afford.
Banned Scam/Spammer
Joined: Jul 2006
Posts: 2,911
Likes: 10
From: Simi Valley CA
I have read that they upgraded the valve springs on the '04s. Less breakage. There's a thread about it.. somewhere. lol
edit: Here it is...
http://forums.corvetteforum.com/show...=springs+valve
edit: Here it is...
http://forums.corvetteforum.com/show...=springs+valve
Last edited by Todd157k; Aug 28, 2008 at 05:44 PM.
Melting Slicks
Joined: Mar 2006
Posts: 2,208
Likes: 2
From: Upstate NY
Racer
Joined: Oct 2006
Posts: 369
Likes: 0
From: Kelowna BC
Mid 03 was the change. Fuel pressure regulation went from inside the fuel filter on the frame next to the transmission, to inside the pump module inside the tank. Also, you can change the pump without dropping the tank on any pre mid-03 car as well as change the fuel filter. These earlier systems, which start in 99, tend to be better for highly modified cars hence why the 02-mid 03 cars tend to be the best for people planning to modify their cars since shocks are a simple swap afterwards.
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Joined: Oct 2006
Posts: 369
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From: Kelowna BC