GM 10-Bolt axle/locker advice needed

[trukman1]

I have a stock '88 K5 that will see very little if any off-road use.

It currently has 28-spline axles with open front and rear differentials. The open diffs aren't going to work for me even when using as a daily driver so...

My question is would it be worth the extra money to upgrade to 30-spline axles and does the fronts use the same outer shafts even if changing from 28 to 30 spline inner axles?
If so, would that create a weak link that would negate the upgrade to 30-spline axles anyway?

I'd like to make it as reliable as possible without breaking the bank bit I also believe in, " buy once, cry once." I don't mind spending the money if it will make it a much better vehicle I just don't want to waste money either.

I planned on installing Spartan lockers front and rear so if I'm going to switch to beefier axles this is the time to do it.

So what advice can you guys give me. Stay with the 28-spline or go ahead and bite the bullet and go for the 30's?

BTW, I'm running 31 x10.5 x15 Toyo M/T tires with 4.10 gears and stock everything else.

Just trying to give as much information as I can to figure out the best course to take.

Sorry for the long post. Thanks for any and all input.

trukman1