Although this is for the 1970 Oldsmobile Cutlass 442, it does mention the 1970 Olds Cutlass S with the W31 option. Their build sheet was a full page with diagonal rows printing out all the equipment and options by name and a space at the bottom for the printer to stamp if that part or assembly was needed. There were two 8.5-inch carriers used: one for 3.23:1 and lower ratios and one for 3.43:1 and higher ratios. Gear ratio Stamped in bottom flange as part of identifier as a letter code, such as AW. Lansing Codes Do Not Appear On The Dataplate Like Some, But Not All, Of The Fremont's Do. ... 442 Olds 1965 65 Cutlass F-85 Bro Bro's BR[] Oldsmobile F85 Brobeck Glenn Brobeck Clone Olds Clone SPECS Olds Specs. 1970 Oldsmobile vehicle identification number (vin) decoder. Location: On plate attached to top left dash board. Fremont was a BOP plant, making Buick, Oldsmobile and Pontiac cars at the same time. He said it is ½ inch wider on both sides, but other than that, it is the 8.2 inch 10 bolt. GM RPO Codes MidsizeBowties Network: MidsizeBowties Smog-Era Rocket100! ... (RPO) codes for the bottom half of the sheet. DIVISION SERIES: The first digit of this code identifies the GM division (1=Chevrolet, 2=Pontiac, 3=Oldsmobile, 4=Buick), the second and third digits identify the series (Chevelle, LeMans, Cutlass, Skylark, etc.). RPO codes, or Regular Production Options, are factory codes for the equipment that came with the car when it left the factory, including standard equipment, options, paint and trim codes, and a model conversion. 1970 Indy Pace Car Option code Y-74. VIN Codes Decodes engine codes used in Vehicle Identification Numbers (VIN's) for cars starting around 1953. 00L : SECONDARY COLOR, EXTERIOR, PRIME The assembly date is stamped in the bottom of the case on the lip where the cover mates. Visible through the windshield. You need to find the rpo codes. May 4th week. The 1963 to 1979 rear end housing has a casting date on the drivers side. Oldsmobile Cutlass Supreme specs: 1988-1997; Saturn Aura specs: 2007-2009; FWD Midsize GM Police Cars; FWD Midsize GM Musclecars; Tire Upsizing Chart; Resetting the Oil Change Light; RPO Codes. A friend of mine just old me that the 1964 to 1967 A-Body cars (intermediates) rear end will bolt into a G-body Cutlass with minor love taps to the upper trailing arms. RPO Codes. They are the options codes. I have been reading this and on page 5 it says the W31 is on the fender. Oldsmobile's 12-bolt 8.5-inch rear assemblies were used in 1967-'70 Cutlass and 4-4-2. To tell you the truth, i don't think anything in the vin is going to tell you that. The ACTUAL pace cars were 442s that used W-30 heads and distributor. Updated with additional pictures (02/18/02). Vehicle History Vehicle History Reports for Classic Cars; ... 1970 Oldsmobile Cutlass 6 Series 33500 Station Wagon 2-seat 1970 Oldsmobile Cutlass 6 Series 33500 Town Sedan See more photos of my Cutlass. One book says the 1970 pace car came standard with the 455 and that "some Cutlass Pace Cars have the 350 4bbl". More RPO codes. If it's a real Y-74, the cowl tag would be stamped Y74. RPO Codes: ’73-’77 GM A-body ’68-’79 GM X-body Option codes; RPO Codes: ’68-’72 GM A-body; Articles. Again, this is the case date code. These differentials used a 12-bolt cover; the pinion is a 1.625-inch unit and has a 27-spline shaft.