1990 Jeep Yj
Hey, i'm new to this forum. I just recently got a jeep about 2 months ago. Its a 1990 Jeep wrangler YJ. It has a 2.5L 4 cylinder. It has the full steel doors, and hard top. I just put a 4" rough country lift kit on it with 1/2" lift shackles. I also put a pacesetter exhaust header on it. The manifold was busted in half in 2 places and cracked in another spot. I also just put new rock crawler skid bumpers on it. The front has the winch plate and d-shackles on it. The rear has the tire carrier and a 2" hitch with d-shackles also. It has 32's on it. I was thinking about going to 33's but a friend of mine has a brand new set of 35's for sale for 600 bucks. So now i'm thinking about getting the 35's. I think i have enough clearance to run them. Also i know my jeep came factory with 4.10 gears and my fiance's brother had a jeep just like mine with the 4.10 ratio but mine feels alot lower than his. I can tell the gears have been changed on mine, it has red silicone around the diff cover instead of the factory gasket. I can shift out of 1st at about 7-8 mph. It has alot of low end torque. I'm thinking that it might have lower gears than 4.10. Any help?
Jack up one tire if you have anopen diff, or both tires if you have a working posi or locking differential. Rotate the tire one full revolution for posis and lockers and 2 full revolutions for opendiffs. Carefully count the number of full revolutions the driveshaft makes. This is your gear ratio. In otherwords, if the drive shaft turns 3 ¾ turns, you probablyhave a 3.73 gear ratio. Turning the tire for twice the number of full revolutions and dividing the drive shaft revolutions by two will give you a more accurate reading
Originally Posted by Poke View Post
My 2.5 to 4.3 swap thread
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