![]() On Gen2, the code is "hit" on the right side of the rear axle (passenger side) with the inscriptions facing the front of the vehicle. You will find that the stock performance manifolds work best on engines with8- 9. There is also a number on this same area, it is the number ' I 2 9 8' along with a casting clock which points to the number 7. 1969 Firebird 400 carb and manifold question. The GM pinion case casting is 1254333, this number was taken from the Pinion part of the case casting, on the drivers side of the case. In fact, at the 2016 Mecum Auction in Kissimmee, a ’69 T/A convertible failed to sell at a high bid of 1.9 million. On Gen1, the code is "hit" on the right side of the rear axle (passenger side) with the inscriptions facing the front of the vehicle. First Generation Pontiac Firebird (1967 - 1969). This would account for the lack of interest from the public at the time, and why 1969 Pontiac Firebird Trans Ams now fetch in excess of 1,000,000 at auction. The 1967 Firebird has the particularity to have a rear axle held by arms while in 1968 rear axle was hold only by the blades/spring of suspensions. Firebird was a big - block V8 that displaced 400 cubic inches, 95 more than SCCA rules allowed. The final drive ratio is identified with 2 or 3 letters codes. This is simply the number of screws holding the crown of the differential and incidentally also the number of screws of the rear cover of the bridge. We also frequently talk about of 10 or 12 bolts. Or is that your discs differential are dead! Conversely, if the car leaves well, then there is a limited slip. Then put pedal to the floor and if the car tends to make the "in-place" you have a standard type. It's very easy to know what type of differential is on your car, just stop on the bottom side of the road with a wheel on the asphalt and the other in the ground/grass/gravel. Two things to know, the final drive ratio and type. Engine displacement / Compression ratio Two very popular items for improving the performance of your Pontiac are low, wide tires and lower ratio ring and pinion gears. ![]()
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