Rancher 420 4×4 silver backs

Hello guys I was wanting to know if I put 27x10x12 silver backs on my rancher with no gear reduction will it turn them fine with no struggle the 27s weight is 30lbs each and weighs 20lbs more than my 26 mudlites I have on there now and that’s the amount more taking account for all 4 tires. The current tire weight is 97.6lbs and the silver backs are 120lbs will it cause a problem turning them going that heavy on stock gearing.