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What is Bluefire? Do you have a part number?

Thank you all for all the helpful data. I want to see instant fuel mileage. What is Bluefire? Part number?

Let’s get back to the bottom line. Driving a 3126B 330 hp 3.90 gears and eco hubs 85psi tires, give it the perfect driving conditions on a flat road. What gear and speed would obtain the optimal RPM for the best fuel economy? I understand other factors like weight, wind etc….. come into...

Replace fuel filter as well.

Thanks Hike

So if Chris shifts into 6th at 65mph then with 3.90 it should shift int 6th around 50mph and maybe set the cruise at 55mph for optimal fuel efficiency. I’m having to pull the front axle shafts out to replace the axle housing seals. I definitely never want to do this again and I have the 3.90...

Correction # 29503336 Missed a 3

I ended up turning a tool in the lathe. But they do go in quite easily.

I'm removing my drive shafts to replace all the U joints and see that my rear transfer case out put is leaking. Found the part for front and rear # 2950336. Anyone have a good source for these? I came a vender for $260 each but no picture and the description is not accurate. Also has any...

I didn’t know you had a you tube channel, I’ll check it out.

Interesting read.

Thanks for the drivers seat perspective on driving both.

What is the peak torque RPM for the 3126 tuned to 330hp?

Forgot to mention it’s a 3126 tuned to 330hp and 27,700 lbs. Realizing all the unknowns keep it simple and pretend flat ground at sea level and a steady 60 mph with 85-90psi. Optimal conditions. which should be better?

Down to the wire, as I’ve started this project of installing Eco Hubs, replacing front axle housing seals, and pinion seals. My plan is / was / I’m not sure to remove my 3.07 gears and put the original 3.90 gears back in. I’m second guessing my decision, based on a good friend driving a 2007...

After reading all of this that’s what I was thinking.

Depends on the year of the vehicle, from Napa mine were 4 each HD12D for the rear and 2 each HD16D for the front. I think, LOL!!! I took a picture of the receipt and thats what's on it but I remember the first time I ordered them I ordered the wrong size for one of them. You can always take them...

I think the LMTV parts spread sheet has a typo, is it supposed to be 5-279X?

Thanks for the advice, i was referring to the front axle steering u-joint. Now you got me thinking of the drive shaft u-joints. Are the front and rear drive shafts the same u-joints? Spicer R-279X? Edit: the lmtv parts spread sheet has that part number.... is it supposed to be 5-279X?

Ok back to this job looming over my head. I've purchased ECO Hubs to do as well. Now the total job is going to be the 4 axel seals #59 & 9 two of each, front and rear pinion seals, change front and rear third members from current 3.07 gears to go back to 3.90 gears, reinstall rear locker into...