Found a 86 bird with 2.8 v6 what are the ways of telling if this car has 3.43 rear?

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305TBI(LO3)
K&N filter

 

my mastake it should be the 3.42

 

only method i ever trust is to pull the cover and read the ratio stamped on the gear set, or simply count the teeth and do the math.

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ICON Motorsports
1st & 3rd
MM Black Diamond 538 F&AM

 

How do I find mor info about the #'s and What is the formula for figuring the teeth count???

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305TBI(LO3)
K&N filter

 

If the car still has the sticker that lists all the option codes, that's another way of determining what's in the axle. I got a book from a dealership that lists just about every option code for GM cars and trucks for about the last 20 years. It's even small enough to take to the junkyard in your toolbox! I recommend you get one of these if you do any serious junkyard hunting. I can't remember the name of the book offhand, but when I get home I'll take a look.

 

Formula for teeth count:

1, 2, 3, 4, 5, ... until you run out of teeth. Count the ring and the pinion. Divide the number of ring teeth by the pinion number.

Nearly all stock gears have the tooth count and/or ratio stamped in the edge of the ring gear. If it's a 3.42, the numbers will be 12 & 41 (41 ÷ 12 = 3.41666667)

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