Chevrolet Repair: 1988 gmc 4wd suburban classic sierra 2500, eng size, gm dealership

Question
What are the specs on this trucks differential? Im trying to see if i can upgrade for more power when im trying to dig myself out of a hole or muddy terrain.

Answer
HI JULIO, THIS INFO THAT YOU WANT IS NOT AT MY DISPOSAL,HOWEVER, I WILL TAKE A GUESS 3:42, BUT YOU ARE IN LUCK. CALL YOUR LOCAL GM DEALERSHIP AND GIVE THEM THE LAST 8 DIGETS OF YOUR VIN# AND THEY WILL BE ABLE TO ANSWER ANY OF YOUR QUESTIONS LIKE THIS. SUCH AS,ENG SIZE,TRANS,REAR DIFF RATIO,POSI-TRACTION AND SO ON..I HOPE THIS HELPS YOU OUT,,, TOM..