THE auxiliary transmission and the 2-speed axle are not in direct competition as methods of obtaining multiratio gearing for, as Mr. Wolf points out, neither can fill the field of the other.
Where their reduction ratios overlap, Mr. Wolf says that the 2-speed axle is more economical in first cost and can give speedier performance at a lower operating cost.
On the other hand, he shows that when larger reductions are required than the 2-speed axle can provide or where three ratios are needed, the auxiliary transmission is without a peer.
In general, he says that the type of multiratio gearing that should be used and in what combination depends on the type of truck operation and the degree of economy the operator will obtain from the additional investment.