Re: whats the stock gears in a 86 cj7?

depends on your axle-crawl down to the rear axle and see if you can find a metal tag bolted onto the differential cover. it should have a letter or two "A" or "AA" or "B", etc. this letter tells you what u have. for a dana

D 2.73 B 3.31 anyone know the stock gears ratio in a 86 cj7 5 speed with a 258?

I have 3.31's in mine.

You can jack up one wheel and turn it two turns while counting the turns the driveshaft makes to check yours.

Mike

Jet wrote:

Mine came with 3.31, per the axle tag on the rear axle.

Jim

Mine came stock with 3:31. This is per the axle tag on the rear axle.

Jim

Not to be left out, My 86 has 3.31 too. Love them, great for both highway speed and the off roading I do

Forget 5th...

I do a fair bit of highway running to get off road and check my mileage carefully because of no gas gauge.

I have 33's and 3.31 gears.

If I stay in 4th gear, I am turning 2300 rpm at 70 mph. If I use 5th, I drop to 1700 rpm or so. This is too low for efficient running and my gas mileage sucks the big one.

If I stay in 4th, I get a sweet 19 US mpg or 11 L/100 km running at 70 mph. If I use 5th, I go down to 15 mpg or less.

It takes too much gas pedal to adjust for wind and slight hills in 5th gear so it drinks gas. In 4th a slight twitch on the pedal keeps the speed even, not a half way or all the way to the floor movement 5th needs to keep it at an even speed.

Mike

Jet wrote:

my 86 cj7 has 32" tires and stock gears and 5th gear is very low in the rpm's on the highway and when ever I come up to a hill I have to put it in

To be nice on the highway you would have to regear.

Jim

I got a weber carb MSD6 offroad ignition box, hedman headers, and still can't use 5th gear. It's not about the motor, it's more about the gears and tires. I have 3.31 and 31x10.5 tires.

I agree that it's more about the tire height and gears. I have a 5 speed,3.31,

I have the same motor, and am running 32x11.50s, I have 4.10 gears.