88’ ax15
I just put 33” tires on and swapped an 8.25 rear axle with 4.56 gears and an lsd.
I now have great power and get up but top out at 55mph via a gps. No front driveshaft as the front is still at 3.07 gearing. I expected a loss in mpg jumping to 33” tires but not a loss in top speed. It doesn’t seem as though anything is creating drag other than bigger wider tires. The engine doesn’t feel like it struggles at all, just tops out and whines. I don’t have a tach but I would guess I’m in the 3000 range on the freeway. Is this strictly a gearing issue in the rear axle or am I lacking or losing power in the engine?
Oh and my first two full tanks of gas measured 12-13mpg with 80 percent freeway and 20 percent street without much in the way of hills.
I’m building an 8.8 rear and want to make sure I get the right gears for it.
I just put 33” tires on and swapped an 8.25 rear axle with 4.56 gears and an lsd.
I now have great power and get up but top out at 55mph via a gps. No front driveshaft as the front is still at 3.07 gearing. I expected a loss in mpg jumping to 33” tires but not a loss in top speed. It doesn’t seem as though anything is creating drag other than bigger wider tires. The engine doesn’t feel like it struggles at all, just tops out and whines. I don’t have a tach but I would guess I’m in the 3000 range on the freeway. Is this strictly a gearing issue in the rear axle or am I lacking or losing power in the engine?
Oh and my first two full tanks of gas measured 12-13mpg with 80 percent freeway and 20 percent street without much in the way of hills.
I’m building an 8.8 rear and want to make sure I get the right gears for it.