how do you check your gear ratio. i lifted the tires up and spun the driveline which gave me 2 spins of the driveline for 1 spin of the tire but that seems insanely high. its a 1981 stock pick up

 

http://www.4crawler.com/4x4/4R_TechI...oDetermination

Remember the factor of 2 factor assuming you have and open differential.

 

ya i have an open diff so does then mean that my gears are 4.10 to 1 then

 

Might be 3.90 or 4.10. Best way to tell is as described on the web page above. Use 10 (or 20) driveshaft revs. while counting wheel revs, then divide the ratio by 10. A lot easier to tell the difference of 30 or 41 wheel revs than 3.9 or 4.1 revs.

 

well thats definetly a lot better then i thought i had but it still seems really fast in first gear. it has the stock 4 speed transmission and i can't find the gear ratios in it

 

Marlin's page will probably tell you that information:
- http://www.marlincrawler.com/tech/tr...ar-ratio-chart

 

thanks

 

You've got 3.90s if it's an '81

 

not always... i've seen 3.73 and 3.42 gear ratios from 1st gen pickups

 

so im going to run 33 12.50 tires most likely with a dual t cases. should i stay at stock gears or go to 4.56s

 

4.88's

 

but i still want this to be my daily driver without getting terrible gas mileage. i also want to be able to go at least 60 with my stock 4 speed

 

In an 1981 4wd? I've only seen 3.90s in '81s