I'm looking at purchasing an '04 convertible and trading my '01. Are there any changes made in the convertibles between those years?
I'm curious if the Chevy engineers did much to improve it and is there a year by year list to refer to in this forum ?

 

The list is not specific to convertibles but is fairly complete. Hope this helps.

Paul


:. Miscellaneous .:

All of this information is variously collected from the Corvette Forum message board, so do not take it as absolute gospel. However, it should be somewhat close. Sources: 1,
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1997
• Completely new, redesigned Corvette. Base (FE1) and Z51 (FE3) suspension packages.
• All Z51 cars include: Power Steering Cooler, xx, xx, ??
• 97-00 C5 LS1's produce 345 HP @ 5600 RPM and 350 Ft Lbs of torque @ 4400 RPM.
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1998
• Convertible becomes available
• Active Handling becomes available late in year
• The two slots of a 1998 (and possibly late 1997s) curve toward the rear at the bottom. (versus straight down)
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1999
• 26# injectors substituted for 28#
• Fuel pump revised to reduce noise
• FRC "Fixed Roof Coupe" aka the hardtop, becomes available. All FRC's are MN6 (6-speed) cars with the Z51 suspension package, and are about 60lbs lighter than coupes.
• HUD introduced
• only one line in driver's side fuel rail cover (no fuel return line?)
• Power telescoping wheel becomes an option
• ? Steering hardware changed to combat wandering
• door sill trim plates added
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2000
• Millennium Yellow available
• ? "Thin Spoke" versus "wagon wheel" design wheels become standard.
• Pup cats added to CA models for LEV emissions requirements (5hp loss relative to 97-99)
• Steel swaybar endlinks instead of plastic on Z51 equipped cars
• Z51 swaybar diameters grow (25.4/21.7 to 28.6/21.7 to 28.6/23.6 (note: new rear same as Z06)
• No keyhole on passenger side doorhandle
• Passenger airbag 'off' switch added to console (light by TC/AH button)
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2001
• return to 28# injectors for all models.
• Second Generation Active Handling
• Nassau Blue discontinued
• Alternator 'clutch' pulley added on A4 cars
• New soundproofing + foam in all cars
• Smaller keyfob
• electrochromic dimming rearview and driver's mirrors
• lighter AGM battery
• Thickness + Material in vert change
• Chrome exhaust tips for coupe + vert
• 85MM MAF with integral temp sensor (versus 74mm with separate plug for IAT)
• LS1 cam profile changed to: .500/0.500, 198/208 on 115.5LSA (From: 0.472/0.479, 202/210 on 117)
• All Corvettes now have the LS6 intake manifold
• All Corvettes now have the LS6 engine block (windage passages in block), which includes a beefier oil pump.
• LS1 changes result in new output of 350 HP @ 5200 RPM and 375 Ft Lbs of torque @ 4400 RPM (MN6)
• Hardtop/FRC discontinued
• Pup cats added to all models
• Stronger synchros in all transmissions
• Exhaust manifolds revised (5hp regained) - thin wall cast replacing SS manifolds
• metal valvestem caps (late year)
• Torque Tube changed from metal-matrix composite to aluminum alloy 6061, increased in dia from 55 to 63 mm.
• Driveshaft couplings have also been upgraded on manual-equipped models for additional strength and durability
• Introduction of the Z06, which has as differences:
o hardtop body style
o rear brake ducting
o screened inlets on front fascia, without foglights
o F1 supercar tires 265-17 front, 295-18 rear, on 17x9.5 and 18x10.5 (one inch wider, respectively
o new LS6 top-end with new style head design (10.5:1 compression, 64cc chamber), LS6 cam (0.525/0.525, 204/211 on 116) - 385hp
o M12 transmission with shorter gearing (1-2-3 analagous to MN6 with 3.90 rear diff
o Titanium exhaust system
o lightweight windshield
o New, stronger clutch with redesigned master + slave cylinder
o Stronger rear differential (shotpeened ring gear)
o Red brake calipers (otherwise identical)
o Trans overtemp warning light on DIC
o 6500 redline gauges with special checkering + Z06 font
o redesigned PCV system to help combat oil burning
o Red LS6 Fuel Rail Covers (FRC's)
o FE4 Z06 suspension - uprated springs, bars (30mm/23.6mm), shocks (note front spring and rear bar same as Z51)
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2002
• Z06 Changes:
o Z06 LS6 cam changed to: 0.551/0.547, 204/218 on 117.5
o Less restrictive intake airbox lid
o Descreened MAF
o Removal of pup-cats (total with changes = 405hp)
o Z06 shocks revised with less rebound for better launching
o Z06 brake pads revised for better stopping (generate more dust)
o Lighter, sodium filled valves w/ stronger valvesprings
o higher tension rings installed to prevent oil burning problems
o slight piston redesign *
o clutch strength upgraded.
o HUD available on Z06 (not avail '01 model year)
o Wheel supplier changed to Speedline, moved from forged to cast. Weight nearly identical
• Electron Blue color offered
• Steel endlinks changed to aluminum
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2003
• Late model-year new fuel system design from C6's
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2004
• Z06 shocks further refined. Accompanying upper front control arm bushing, and rear swaybar bushing changes.

Information courtesy of http://www.jakelatham.com/c5/misc/differences.shtml