hi there,my 1998 gmc 1/2 ton 4/4 came with p245/75/16 tires installed,I can get some LT235/85/16 tires at a good price at wal-mart made by goodyear{trail mark} on the side wall to do some off-roading and gravel road driving.My question is will it do much to the computer and how much will it effect my speedo,thank you in advance.
bushwalker,a new guy here....