M813A1
Member
- 867
- 3
- 18
- Location
- OKC, Oklahoma
Yes it will gain speed but you will oose pull power with the 1400X20 I would not recomend these tires !! The M915A1 will pull any load at 70 Mph all day !! If you can a M915 with the 16 Speed Cat trans you will be able to run out at 75 empty it is a bit faster. But for the money the M915 or M916 would be your best bet !!