1942 - 1947 Chevrolet Shop Manual

4-33


Rear Axle Ratio	Transmission	Speedometer Gear Set	No. of Teeth on Drive Gear	No. of Teeth on Driven Gear	Gear Ratio	Adapter No.	Ratio
		PASSENGER
4.11 to 1..........*3.73 to 1 .....	3 Speed 3 Speed	605061 605062	4 5	12 14	3.000 2.800
1/2-TON
4.11 to 1..........4.11 to 1........	3 Speed ♦4 Speed	605061 602798	4 4	12 12	3.000 3.000
3/4-TON
4.55 to 1...........4.55 to 1..........	3 Speed *4 Speed	605063 603075	6 4	19 13	3.170 3.250
3/4-TON SPECIAL
4.55 to 1 ........4.55 to 1 .........	3 Speed *4 Speed	605061 602798	4 4	12 12	3.000 3.000
3/4-TON LONG WHEELBASE PANEL
4.55 to 1 ...........	4 Speed	602 798	4	12	3.000
1-1/2-TON and <		C.O.E. MODELS (SINGLE SPEED			REAR AXLE)
6.17 to 1 .........*5.43 to 1 ...	4 Speed 4 Speed	603074 603075	4 4	15 13	3.750 3.250
1-1/2-TON TRUCK (2-SPEED REAR AXLE)
High (5.64 to 1...........High (*6.17tol.....Low 8.22 to 1...........	4 Speed	603075	4	13	3.250	1565814	16-17

*Optional Equipment.

NOTE—On all two-speed rear axle trucks a two-speed Speedometer Adapter Assembly is used as standard equipment. This adapter is automatically shifted when shifting the rear axle. Part No. 3652705 Adapter is used with the 5.64 to 1 and 8.22 to 1 ratio axle, and part No. 606431 Adapter with the 6.17 to 1 and 8.22 to 1 rear axle.

REAR SPRINGS

The rear springs on all passenger car and truck models are of the semi-elliptic type and are designed for each individual unit to provide adequate load-carrying capacity and a spring rate which is proportional to that of the front springs to give the smoothest ride possible.

Two-stage springs are used on all 3/4-ton models as well as on the 1-1/2-ton 134-1/2" Wheelbase panel and the 160" and 195-1/8" Wheelbase School Bus chassis. The advantage of two-stage springs is in the reduction of the rebound or "throw" condition when the truck is not loaded and still give the proper resistance to or control of "bumping through" when the truck is loaded. On all two-stage springs the rate change occurs prior to reaching one-half of the rated chassis payload.

Speedometer Gear Adapter Assembly, part No. 1565812 is used in addition to the above when two-speed rear axle truck is equipped with 8.25-20 tires and either the 5.64 or 6.17 ratio, also when 7.50-20 or 34 x 7 10 ply tires are used with the 6.17 ratio.

REAR SPRING CHART


		COMMERCIAL			1-1/2 TON
	Ton	3/4 and 3/4-ton Special	3/4 Ton Long Panel	134-1/2" and 160' and all C.O.E.	134-1/2" Panel	160" & 195-1/8" School Bus
Length	54-1/8"	46"	46°	46"	46"	46"
Leaf Width	1-3/4"	2"	2"		*2-1/2"*	2-1/2"
Stage	Single	Two	Two	Single	Two	Two
Rate	190	250 370	315 435	800	360 525	550 1000
No. Leaves	8	7	8	10	8	11