I took my truck in for an oil and filter change .i also requested a wheel alignment and told Glen that I thought I had a problem with the driveshaft sticking on hard stops which caused a jerk (I think they call it driveshaft jacking ).The oil and filter were changed as requested. The wheel alignment was checked and found to be within specifications (no charge for alignment as not required. Apparently when they removed the driveshaft to lubricator the spine ,they found a problem with the universal joint and fixed that also.since I am heading to the USA on a month long holiday and pulling a trailer , I was happy they found the universal joint problem. Glen kept me in touch with progress of service on my truck and arranged for a ride to my place of employment and back .Everybody at SMP is very friendly and helpful .