Streetmaster 318 vs. Performer for street use

DQ81 said

Actually I looked manually and it appears they are 3.21's

But I just went for a drive and kept it at 62.5 exactly (100kph) and that was steady at 2100 RPM which would correspond w/ 2.74's...

I don't friggin know with this car. The speedometer could be off so I'll have to check it witha GPS or somethin...

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This makes me wonder about speedometer accuracy in general with these cars. Mine is weird in the other direction. Rear is tagged as 3.21, tires are 195 75R 14 and GPS shows 72 MPH on the speedo to be 65 MPH actual speed. My intended fix is to stuff a 235 60R 15 under it (two birds w/ one stone).

The allen screw previously mentioned is inside the vacuum canister. You'll be able to feel it by sticking the correct-sized allen wrench in through the nipple.