How do you find the gear ratio on a GM rear end?

Count the teeth on the small gear in the forward part of the axle housing, called the pinion gear. Count the number of the teeth in the big ring gear attached to the differential. Divide the number of teeth on the pinion into the number of teeth on the ring gear. This is the gear ratio.

How much is a 1979 Trans Am worth?

For instance, the average price of a 1979 Trans Am (with the 400 Pontiac V8) is $22,500, according to Hagerty’s Valuation Tool, while a Tenth Anniversary Edition in the same condition is worth about $10,000 more.

How do I know my rear axle ratio?

Turn the wheel TWO revolutions and count the number of driveshaft turns. The number of driveshaft rotations will help you determine your rear axle ratio. For example, if it turned 3 and a half times, it’s a 3.50:1 ratio. If it turned 4 and a quarter times, it’s a 4.25:1 ratio.

When did the Trans Am Firebird come out?

These blocks will not have V.I.N. codes or motor unit numbers. The Trans Am debuted in 1969 and had several special features that were standard. 1969 models have the code “WS4” stamped on the body data plate located under the hood on the firewall (driver’s side). Posi-traction rear axles were always standard on Trans Am models.

What was the year of the first Trans Am?

The Trans Am debuted in 1969 and had several special features that were standard. 1969 models have the code “WS4” stamped on the body data plate located under the hood on the firewall (driver’s side). Posi-traction rear axles were always standard on Trans Am models.

What is the RPO code for a GM transaxle?

GM RPO Axle Code List (G) RPO Axle Type Ratio G11 Transaxle 2.56 G44 Rear Axle 3.07 G72 Rear Axle 2.14 G75 Rear Axle 3.62

Is the rear end of a Trans Am Posi?

If it’s truly from a trans am maybe you’ll be lucky and it will have 3 series gears and a posi in it So. Lake Tahoe CA. USA Many of the TA rears are going to have crap gear ratios. Just because it’s disc does not automatically mean it also has good gears.