99 Suburban--Axle ratio?

[Bryan59EC]

I have a 98 K1500 with a front differential that will not engage.
Electrically fine, and the motor is working.

A friend is gearing up to dismantle the 99 Suburban and it is also a
4x4.

I have just gone thru every RPO code in that particular car and did not come up with an axle ratio---so I am guessing the ratio would be standard equipment.

My Pickup is utilizing 3.73 differentials and I was hoping to appropriate the front differential from the suburban is the gearing was right.
The Suburban has an M-30 trans and a 5.7.

Would anyone out here know what the standard axle ratios would be for a 99 Suburban with an AT and 5,7? The Car is pretty well loaded with options and apparently delivered to a Salt Lake dealer new.

Just don't want to pull the diff and find out it will not work.

Or perhaps someone could tell me where to find an axle code and what it would be for a 3.73 (what my 98 K1500 is sporting)