At 70,178 miles took my Transit 350HD Wagon in for regular oil change and inspections per my extended warranty. Asked them to check the Guibo too. At 61,000 it was ok (or so they said). At 70,178 it was so cracked that they advised against driving it. They ordered the new part & and oil filter they didn't have in stock and said it would be finished next day. Oh, and the repair is out of normal warranty but covered under extended warranty for $100 deductible.
Wagon was finished next afternoon. Paid the $100 deductible. I'm not mechanical enough, nor do I have the tools, to do it myself, so I deal with the dealer's service shop. I think this is the first & last time I ever spend the outrageous money on an extended warranty.
My hat's off to those of you who can do the service yourself.
Charles County, Maryland
2015 Transit 350-HD XL Wagon, HR, EL, DRW, 3.2L PS Diesel, 3.73 LS Rear Axle, 15 passenger, Tuxedo Black, Charcoal cloth seats