Ok, I'm trying to narrow this down as to what my gearing is.

It was an original 289 4bl.
Eight inch one tire frier and a 3spd manual.

Stock gearing. What could it be?

 

probably 2 83's or what ever they were.

 

I was thinking they were 2 somethings too. The car was a DOG today. That engine was trying to spin the drive... but it said NOOOOOO lol. I'll get it all figured out.

 

lol, sounds like new gears and a trac loc or something similar is in order! and maybe a blower

 

I think they are something like 2.73 or 2.75.

If you want a limited slip type diff may I suggest the tru track


http://store.summitracing.com/partde...5&autoview=sku

-Gun

 

I'll look into it, but that's for an 8". But like I said. I have a 9" from a 68 Stang waiting to be checked and installed.

 

Oh thought it was for your 8"

Oh well they make in 9" too + you get more gearing choices

-Gun

 

Put your car in neutral. Have someone roll the car forward, letting the tires make a complete revolution. Count how many times the driveshaft goes around.

 

If you're too lazy to do that and you know for sure the gears haven't been changed, simply check the warranty plate on the driver's door. It should show you the axle code, which relates to which gears you have. There should also be a tag on one of the bolts on the rear, but most of these have long since disappeared.

Likely ratios are 2.80 and 3.00

 

I would really be surprised if a 3 speed manual car had a ratio that high numerically in it from the factory. I would expect something on the order of a 3.25 or 3.50. The big cars mostly had 3.73's or so behind a 3 speed stick. The 2.80 or 3.00 mentioned by other posters would be what would have come in an automatic transmission car.

The ONLY way to know is to raise it and check it. Since it is an open differential you only need to raise one side. Turn the wheel and count the driveshaft turns, then multiply by 2. Example: The raised tire turns one turn while the driveshaft turns 1.5 turns = 3.00:1 ratio. With both wheels off the ground the same car would turn the driveshaft 3 turns for one turn of the wheel.