Just got my isspro tach installed and discovered that I am turning 2100@ 65mph...Is this even right? My overdrive works fine however my right foot aches to keep it at this speed. I have ordered a 3200gov spring to see if this makes a difference. I havent had time to look at my diffs yet but I am assuming they are 4.10.

 

Mine turns 1800 with 3.55's and 35 inch tall tires, so your about rite if U have 4.10's

 

yup 1800 @65 on mine you must be running 4.10s

 

I did forget to mention i have 265/75 tires. But with what you said I am a bit curious what others are getting.

 

There should be a sticker on the front under side edge of the hood that will say what gears,

Or a tag on the rear diff. cover that says the gear ratio, may have to get a wire brush and clean it off to see it.

 

Also the auto might count for 2-300 rpm...

 

Yeah maybe it is the stock tc that i still havent had time to even look at. Thanks for the help I probably could have done a better job searching the forums. Now I just have to decide if I ever want to change the size.

 

On my 92 I used to have 235/85/16's, 3.54's and a getrag which has a .77 overdrive and ran 1900 rpm at 65 mph. Now I have 215/85/16's, 3.73's and an NV5600 which has an overdrive of .73 and still run 1900 rpm at 65 mph.

 

i still find it interesting in another thread there was a discussion that 4.10 seem to get better mileage