Gearing question

[Rifter_Chevy]

Here is the deal. I have a 84 4x4 pickup. I need rear end work done. I want to get a locker installed when i do the work.

However i also intend to lift and run larger tires so i want to change the gearing now, then lift later as i dont want to have to repurchase a locker when i lift(from what i understand the 3 series gears need a differnt locker than the 4 series).

Right now truck is sitting on 32x10.5 tires, has a TH 400 and a NP 208. I will be lifting and going with 36x10.5 tires and swapping out the 208 for a 205.

Currently i have 3.73 gears. I want to go to 4.56 gears when i do the rear end work, will also obviously swap the front axle gears at the same time.

How bad is the 4.56 gears going to be with my 32" tires. Will i even be able to drive on the highway?

Truck is a daily driver now but will not be after the lift, or at least not for very long after it. Truck is being built for a off road weekend toy.

[kwmech]

That is roughly an 18% difference in gearing so your engine will be spinning that much faster. So if your 2500 at say 60mph. you will now be close to 3k at the same mph

[1malo68]

This should answer all of your questions
http://www.grimmjeeper.com/gears.html

[Chevy1TonFun]

I would lift the truck first then do gears. Your MPG is going to be pretty horrible with 32s and 4.56 gears.