ok the specs....
93 pickup sr5 v6 4X4
at 70 mph i am turning approx 3000rpm with 31 inch tires....any ideas...is there any way i can change my gear ratio to lower my RPMs on highway driving?

 

5 speed or auto? This will help:http://www.off-road.com/toyota/tech/other/4_axles.html

 

i knew i was forgeting something...5 speed

 

i will tell you if you tell me what your axle code is... dont know where to find it... look here

http://www.4crawler.com/4x4/ToyVIN.shtml#VINlocator


you can also decipher what your own code is from that site

 

You more than likely have the 4.56

 

5th gear ratio is .838
31s are typically 30.5" tall.
Do the math and a 4.56 axle ratio gets you 2947rpm.
Close enough?

 

I assume if you want to LOWER your rpm's then you must not offroad the truck to much...

 

Yo BTrek - don't do it! 3000 at 70mph is already perfect!! Drop too much and you'll lose all the get-up-and-go, and you don't have a lot of that to spare! It will be a dog and you'll hate it. But if you really want to do it, I bet you can trade someone your 4:56s for their 4:10s in a heartbeat.

 

ok...thanks for the info...i off-road once in a blue moon...i just don't have the money to be replacing parts and upgrading...