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If you can find one, get the 78-79 Dana 60. You can buy caliper brackets to retain your factory front brakes and have the hub machined to keep your ABS. You get to keep factory lug pattern as well.

I’ve been using synthetic oil since I started driving, started with Mobil1 and tried Amsoil then switched to Schaffer oil. I’ve never had an oil related engine failure and I keep stuff to 250-300k miles. What benefit would this oil have over any other good synthetic oils?

It looks like a gallon of 5w40 is over $70

Sarcasm? I don’t think anyone got it.

They should be able to bump the power up some then, if they use it.

It will have an 8spd trans behind it so that may help it out.

I'm thinking dual filter.

I have a nice brand new pump to install in the near future with new injectors. I want to ditch the factory filter setup and go with a spin on and replace the lines while Im at it. Is the FTB mod worth doing on the pump inlet? Anything else I should be doing while Im at it?

Should be a great addition

I would add something to the frame attachment to allow for flex. Like already said the fixed point at the frame limits the leafs from moving freely. This is OffRoad Designs setup I have a picture of,

It will just pull the brush guard off and damage the bumper.

Just run a non synthetic oil and change it out at 500 miles then 1000 then do the regular oil changes. Swap to synthetic at 10k and you should be fine. The only thing to realy seat in the new motor is the rings. Drive it easy for 100-200 miles then load it up some to build cylinder pressure.

I run 37's and 4.56's, good match with the 6.5

I see no real gains or losses on anything.

You would need a cam shaft designed for the rpm you wanting the most power at plus all the other things mentioned

Why? Is it to keep fluid in it when the vehicle is off?

I will run the new pump and cover install and a dyno run, hell I will even pay for the pump

Hit the junk yard before you buy anything online. The 14bff is a very common axle to find in a bone yard for 100-150 complete. Pull the carrier and swap it out with yours if you find one with the same gears.

Yes you can swap to a newer 14bff out of a newer truck, I have one in my 98.

Since your at the start of this, check the wiring around the turbo vane sensor at the back of the motor, there is a TSB out that shows how the dog house insulation has rubbed through the wiring and caused over boost code.