I believe the VY2/VZ part
but the Holden range still ran 3.08:1 not 307:1.
Also HDT had a option of 3.9`s on the monza R/T.
Engine:
Holden 346 Cubic Inch V8. OHV design with cross flow cylinder heads. High Energy distrubutorless ignition. Twin knock sensors. Grouped fuel injection. Bore x Stroke (mm): 99.0 x 92.0 Overhead valves, pushrods, 2 valves / cylinder. Compression ratio: 10.1:1. Onboard diagnostics. Max power: 365kw @5600RPM
Induction: Electronic sequential fuel injection.
Transmission:
T56 6 -speed manual.
Ratios:
First: 2.66
Second: 1.78
Third: 1.30
Fourth: 1.00
Fifth: 0.74
Sixth: 0.50
Differential: LSD Ratios:
Automatic: 3.08:1
Manual: 3.46:1
Clutch: Single Dry Plate
Steering: Variable ratio rack & pinion.
Suspension:
Front: MacPherson strut. Direct acting stabiliser bar. HDT Springs.
Rear: HDT Improved Independant rear suspension with optional upgraded IRS rear bush kit and optional strut brace.
Brakes: Split circuit hydraulic system with power booster.
Front: 356mm ventilated discs and four spot Harrop calipers.
Rear: 343mm ventilated discs and four spot Harrop calipers.
Wheels & Tyres: 18" x 8" Milano III rims with 235/40/ZR18 tyres. 19" optional with 243/35/ZR19 tyres.
Options:
Stage 6 Engine Package (400kw) $15,000
Brakes (356mm all round): $8000
Suspension level II $3000
Bodykit (Including rear wing) $3000
Wheels & Tyres (depending on tyre type) $5000
Interior (doesn't include roll cage) $1000
Diff (3.9:1), short shifter (Synthetic transmission oil) $3000
Fuel Tank: 70 Litres
Number Built: 100.
Prices: Base Price: (approx) $103,490.
http://www.brockcommodores.com/Fact%20Files/monzart.htm