my transmission will no longer shift into o/d, its done it a couple times on the highway while just driving with cruise control on, so i pressed on the throttle all the way to the floor then let off and it would turn back on but now it wont go into o/d, ive tried to get any error codes nothing.

its a 94 grand cherokee 4.0 auto

and if anything will a 2000 jeep cherokee 4.0 auto transmission mount in