Keith, when you use the 5100 front shocks they are designed to be used with your factory coils. A standard wound Eibach coil isn't compatible with the spring seat on the 5100's, only the factory coil fits. We might be able to get a product from ToyTec that uses the Bilstein 5100 strut and they put an adjustable spring seat compatible with the Eibach type coil and they have a couple of different coil rate choices.
This from a vendor in regards to a query about possibility of getting a set of 5100's already set up with the Eibach 16" / 600# coils. So I would not have to try to get access to a spring compressor to put them together. Any advice on a similar setup that anyone has used and is happy with? I installed the hellwig 1500# helper springs on the back today to help with towing stability and heavy loads in the back which kicked up the stern about another 1.5" or so. Now the truck is pretty much visibly not level. Also I want to eliminate body roll in turns. For what I use my truck for I don't need it lifted and don't want to change driveline angles any more than absolutely necessary. I don't think a couple of inches more in the front would hurt too much but I don't want to go any more than that.
Any advice or thoughts on this would be appreciated.