NV4500 transmissions are very large light duty truck transmissions. They are about 200 lbs without oil. I suspect you have T5 transmissions that could be from any number of donor vehicles. The T5 transmission from s10 pickups is a popular swap in light duty stovebolts. It is a near bolt in. The NV4500 referenced here is a heavier transmission that is more suitable for 3/4 and 1 ton trucks, or high powered v8 trucks.
