Could it be the amount of leverage the tires and gears are putting on the axle that is breaking the diff componentsElwenil said:'88 W150 with a stock TBI 318, 4,56 gears and 39" tires since it would not ever stay in spec. I refuse to use a 9 1/4" and replace them whenever I end up with a 1/2 ton truck that has one.
scooby67 said:The truck is a '91 D150 with a 360 TBI and 904 trans. The rear has 3.55 gears currently and relatively stock 15" tires. (255-60's) I may upgrade the driveline to a 440/727 combo or a built 360/727 combo and was wondering whether I should change the rear to an 8.75 or if I can still utilize the 9.25?
Once again. What size tire are you using? They put 9.25s in cars and trucks and even in one ton vans. It can hold up to the power. They have held up to big blocks. The thing to ask is are you going big as in big tires and gears or a street machine that will see a 30 in tire? Seeing as your running a D truck which is a 2x I think you will be fine. Especially since your not loading it down as a trail truck with tools, water, camping gear extra parts. That and the lighter weight in the rear end will make it a hell of a lot easier to spin the tires.88_mopar said:It should be ok, ive heard of 8.25"s holding up behind big blocks. As long as your not using a trans brake you shouldnt grenade it too bad.