Today my Liberty started intermittent vibration/jerks at steady 40-50 mph. Have owned this Liberty since it had 10K miles and it now has 235K. Used for transportation only. Replaced engine at 215K with a Jasper engine and it has performed well. The vibration/jerks happens at steady throttle and feel like hitting rumble strips then goes away with acceleration. Hasn't thrown a check engine light yet. Transmission had a full service at 75K but have been advised it could cause problems if serviced again at higher mileage. Now I'm thinking the transmission may be failing. What do you guys think? If transmission is the problem do you suggest rebuild or replace with a Jasper rebuilt? Thanks in advance for your thoughts.