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Partially availability at the time I was looking but mostly noise level. I heard a 4bt running and thought it was pretty loud. Then I took Rhino's 4BD pig out for a drive and was amazed at the noise level difference. While driving I could carry on a conversation in the cab and Rhino's 55 had little to no sound deadening at the time. It really wasn't much louder than my stock '62 was when I had an exhaust leak. I think at the end of the day it's going to cost more because there are more adapters to buy but it's worth it. With the new adapter for a manual transmission it opens up a lot more options for drivetrain also. If you do a noise comparison of your own you'll see what I mean. Pull up next to a bread truck and you'll see how much louder they are in comparison to the box trucks. I think the 4BD is actually quieter in an LC than in the box truck but that might just be me.
Someone will probably correct me on this last part but I believe the 4BD gets a little better mileage than the 4bt. I think around 5 mpg which wasn't a big deal a year ago when I got the engine but since diesel is just shy of $5 by me (4.91 as of today), that's basically a buck a gallon now.
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