Gifu is still right about that in my opinion. You will get best mileage gearing for about 1800 rpms cruising highway.. I would say leave the 3.73s, I am in the same boat, wish there were 3.73s for my 80 axles as well...
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Why are you putting the regular LC axles back in? Since you already have the stronger Dana axles, why not just leave them there?
As far as the 6bt and SVO PLEASE don't do that to a great engine. I have almost 5 yrs experince with SVO/ WVO and Biodiesel, if you do any kind of alt fuel. I highly recommend Biodiesel. From all the data that I have collected it is a proven fact that SVO WILL coke up the insides of the engine, and injectors. It may take 30,000 mi but it will happen. My first (only ) WVO test was an 85 vw golf and after 10,000 miles and about a yr, it had lost a lot of compression and was burning lots of engine oil the only thing left to do was rebuild the engine.
I got a call just this week from a guy that was working on a 92 dodge that had been run on SVO for only 500 miles, it had broken the rotary injection pump and clogged all the injectors.
As far as your conversion goes, I would love to see the pics. Sounds like a great conversion and hope to see it soon.
Dieseltim
Did you plan make a cut and turn in this front axle .?
Congrats on the install... But that is a ton of lift, unless you want 10" of lift (I would be hard pressed to think of how you could need 10" of lift), you will need to lop all of that stuff off the front, the hangers, etc.. You should get down to 5-6" if you want a SOA, then it will be streetable and the truck will be 20 times more stable. Otherwise congrats on the install, pretty neat!
Have you been to the shop to check out your cruiser lately?