The VIN number is also found on the vehicle certification (VC) label. The VIN is stamped on a metal tab riveted to the instrument panel, top upper left of the dash. The vehicle identification number (VIN) is a 17-digit combination of letters and numbers. It seems the gear ratios have nothing to do with it being a Equa-lock (Posi) though there are four codes for the 390 equa-lock, thats encouraging.Hey, I found this on my 2002 Ford Car Service CD. Okay, I really need to get back to work on the tech article I'm supposed to submit for the March-April 2020 issue, or I'm going to have to pull this and use it instead. The 3.20:1 ratio has no corresponding tag code in the '65-'72 MPC: it appears that the ratio may have been 3.25:1 when going through the MPC. Note that the 3.20 ratio/data plate code was found on ROTs or data plates submitted to the VTCI Registry for '64-'65 - I need to check if it's listed in the '66 T-bird Shop Manual. The list below adds ring gear diameters and axle spline counts that currently are not shown in the OFS. ![]() WEF-H Thunderbird '66ē.00ę 3/8 in NLē1Ĭorresponding with the above are data plate and axle tag codes that are listed in VTCI's 1964-1966 Original Factory Specifications Manual (don't have one yet? You need to order one). Tag Application Ratio Ring Gear NL/L # Splines/Axle For '63-'66 there are several tag codes listed in the '60-'64 "Blue Bible" and '65-'72 Ford Car Master Parts Catalog (MPC) as follows: It just so happens that I'm starting work on developing an article for the Scoop on rear axle tags/codes related to '63-up T-birds. In '66 a two-digit code began to be used, with the second character either a number (non-locking) or letter (locking). Typically, on the data plate, a number code indicated a non-locking rear, while a letter code indicated an EquaLock. For '66 it shows at least 3 locking rears in one 9-inch and two 9-3/8" versions. JMO, Bob CĪccording to the '65-'72 Ford Car Master Parts Catalog (MPC) there was one ratio for limited-slip/EquaLock in '64 and '65. If I recall, there was only one ratio from the factory that was limited slip. I believe the tag on the diff will have an "L" in the ratio designation(for locker), nothing on the door data plate.
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