Both FedEx and UPS will be limited to 150# for their parcel service, however each has their own LTL freight services as well. I ship heavy parts every day (I sell calipers and rotors for a living), so it is all about the packing. Make sure the boxes you're using are rated for the weight. Boxes are rated with an Edge Crush Test (ECT) score, with normal single-wall being ECT-32, slightly heavier duty single-wall being ECT-44 and then you get into double and triple-wall construction. Not even the best packing job will save the contents within a box from damage or loss if the box isn't rated for the weight. If you saw how these things come out of the FedEx/UPS trucks and fly down the slides and conveyor belts, you shouldn't leave anything to chance. Possibly more importantly, insurance will only cover loss or damage if the items were packaged per the shipper's recommendations. Many claims are rejected due to insufficient levels of care with packing and inadequate packing materials for the item(s) being shipped.
As for palletized shipments, my words of wisdom here would be to not trust the pallet unless you built it yourself. I've received more than my fair share of LTL freight shipments over the years and seen a lot of damaged shipments, crushed pallets, etc, so don't assume anything. My NV4500 came from a rebuilder in the midwest and took a nose dive off of a loading dock because the pallet failed...don't let that be your transmission. Sheet pallets with OSB or plywood if the weight or parts call for it. Make sure the banding is through structural components of the pallet, otherwise once the pallet crumples, the bands will fall loose and whatever they're holding is free to exit stage left on the next freeway off-ramp.