Re: Swapping 4.0 Flywheel into a 4.2 info needed.
Use the flywheel off a '91 or later 4.0l along with the crank sensor for a manual trans 4.0l ('91 ) to eliminate the need for the dampner kit. A wrecker will charge around $100 for both, The modified dampner will cost around $170, plus the cost of the crank sensor and mounting bracket that Mopar sells. If you are swapping in parts off a later YJ, get the sensor, flywheel and computer off the same Jeep if possible. Hope this helps, good luck!