I would be curious to know if anyone out there has to say about highway speeds and rpm's using the 4d56T and a 4.66 diff ratio. I have located front and rear 3.9's out of a 4x4 MM truck and the rear is the LSD versionàI was going to wait til the engine is in and I can see how she drives before changing the differentials. I would love to be able to drive at decent highway speeds and get good mileage.

The engine swap takes place next week and I will have bunch of photos.
I am taking out the AC system (no need for it in Humboldt, CA) and putting in a big ol front mount intercooler along with cockpit boost controller and EGT/Boost gauges where the old radio use to be.

The next question is, does my 199k mileage transmission need a rebuild to handle the diesel?