any way to tell what gears a 86 ford has

[IWantATurbo]

from the info in this add?http://www.klode.com/kws/NApplications/Display_Pics.aspx?Exit=Close&StockID=857038

need some 3.55 gears would be nice if this one had some!!! how would i tell if i go look at it?

 

[Sambo11]

If the rear end doesn't have an I.D. tag I would jack the rearend up off the ground far enough so you can spin the tires around. This works best with two people but I have done it by my self too. Anyway spin the tire around one full turn as you count how many times the driveline turns. If it is a 3.55 the driveline will turn 3 1/2 times for every one full revolution of the rear wheel.

 

[IWantATurbo]

thanks, thats what i thought but was not sure. for 4.10 it will go 4 and atenth around right?

 

[410Fortune]

86 Ford 7.5 and 8.8 gears are
3.27, 3.55, 3.73, 4.10, 4.56

3.55 and 3.73 are most popular

I have a few sets of Ford factory 3.73 ring and pinions for the 8.8 axle if you are interested, I even have a rebuilt factory limited slip from a 31 spline 8.8 I could throw in I regeared my BII 8.8 to 4.10 and installed an ARB locker

3.73 and limited slip have less than 5000 miles on them

the axle ID tag should read something like 3L73 which would be obviously 3.73
If the truck is 4wd most likely they are 3.73 or 4.10 with towing package
2wd most likely 3.27 or 3.55

Yes the rotations will be 1:3.5 or 1:3.73 or 1:4.1

Also the VIN number or the door sticker will tell you the gear ratio, you can google the info if needed

 

[IWantATurbo]

thanks, i have an 83 cc f350 with a cummins in it. it has 410s now with a top speed of 61 that sucks!!! speed limit is 65 so it has to go at least 75. oh yea it is a 4x4. so just looking for ways to get the speed up 3.55s with 35s should put me at 70mph at 1700 rpm so thats my goal. but now i might just take the cummins out and put it in a 04 superduty??????

 

[stripe]

3.55 and 3.73 are most popular