We have 2024 transit passenger 350 with rear seats removed, use to carry bicycles and kayaks so not much weight in rear. We loud humming from rear at speed above 74 mph?
Broward
Check with your dealership , there was a TSB on this
The TSB for the 2024 model is TSB 24-2099. This is the text: This article supersedes TSB 22-2444 to add 2024 model year vehicles. Some 2015-2024 transit vehicles equipped with rear wheel drive (rwd), single rear wheel (only), and u-joints at the transmission flange and rear driveshaft may experience a boom/hum/moan noise from the rear while driving. This noise is most noticeable at highway speeds: 112-121 km/h (70-75 mph) for 4.10 axle ratio 121-128 km/h (75-80 mph) for 3.73 axle ratio 136-145 km/h (85-90 mph) for 3.31 axle ratio the noise may also be present to a lesser degree at roughly half of the noted speeds. This may be due to a 2nd order driveline frequency transmitted through the rear driveshaft, rear axle and into the body through the leaf springs.
The TSB for the 2024 model is TSB 24-2099. This is the text: This article supersedes TSB 22-2444 to add 2024 model year vehicles. Some 2015-2024 transit vehicles equipped with rear wheel drive (rwd), single rear wheel (only), and u-joints at the transmission flange and rear driveshaft may experience a boom/hum/moan noise from the rear while driving. This noise is most noticeable at highway speeds: 112-121 km/h (70-75 mph) for 4.10 axle ratio 121-128 km/h (75-80 mph) for 3.73 axle ratio 136-145 km/h (85-90 mph) for 3.31 axle ratio the noise may also be present to a lesser degree at roughly half of the noted speeds. This may be due to a 2nd order driveline frequency transmitted through the rear driveshaft, rear axle and into the body through the leaf springs.
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