I'll have to agree some with Phill. I have driven cars all over the country with the 200R4 with no problems, all had over 100,000 miles. Then I had an 84 Caddy with 200R4 I had to rebuild and with the upgrades it went for another 100,000 miles, even with the dreaded 4100.( it had nearly 200,000 miles on the 4100 before i parked it. I have seen 700's that would not stay together. Most of the time depends on maintenance and the driver.