I found a 308 posi from a mid to late '70's GM PICKUP 1/2 ton with spring perches that are same as my 49 original perches. The overall length is very close as well. The truck has the original 3 speed transmission and torque tube. Would the gearing be OK for the 3 speed transmission as is? The tires are tall thin tires on original 16 inch rims. Thanks
