Hello, My name is Dave and I have a Question for you guy's ! Im planning on replacing my stock rear blocks on my '04 F250 SD FX4. I have a pair of the F350 blocks that are about and inch or so bigger. Looking at the u-bolts it looks as thow the stock ones will work so my question is this ... Does anyone know if I have to adjust for the angle of the drive shaft with these blocks ? They are flat not Like for the after market angled blocks ? I prefer to stay OEM FORD products if possible, Any help would be a great help ! Thanks !