Need some help with a 2 speed axle - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Blue85 · 04-12-2010, 01:15 AM

Just picked up a 68 C60 grain truck, 350, 4spd, 2spd rear, having trouble getting the rear to shift, have power all the way into the shift motor on both wires ( depending on switch position), but she doesnt do a thing. I'm thinking i'm missing a ground wire on the rear end somewhere, or did they ground through the rear end/frame somehow? Hoping someone with some 2 spd knowledge will chime in. BTW its is the 2 wire motor, not the newer style 3 wire.

CE20934 · 04-12-2010, 07:17 AM

If I remember my bus right, it grounds through the rear end. However, the limit switch was shot when I bought it, so I could only shift into LO. I could shift into HI if I reversed the wires. Obviously that would only work while parked with the shifter assembly removed & grounded directly to the battery.

I found a limit switch in a salvage yard V60, and the bus shifted fine after that.

Can you shift it at all if you reverse the wires?

Blue85 · 04-12-2010, 11:10 AM

No , it wont shift at all, switch looks new, there is power at the wires. Thats why i was kinda wondering if there should be a ground wire comin of somewhere

CE20934 · 04-12-2010, 07:02 PM

How about the switch inside the shifter mechanism on the rear end? That's the one that was shot on my bus.

04-12-2010, 01:15 AM	#1
Blue85 Oilfield Trash Join Date: Sep 2003 Location: Raymore, Sk, Canada, Earth Posts: 3,171	Need some help with a 2 speed axle Just picked up a 68 C60 grain truck, 350, 4spd, 2spd rear, having trouble getting the rear to shift, have power all the way into the shift motor on both wires ( depending on switch position), but she doesnt do a thing. I'm thinking i'm missing a ground wire on the rear end somewhere, or did they ground through the rear end/frame somehow? Hoping someone with some 2 spd knowledge will chime in. BTW its is the 2 wire motor, not the newer style 3 wire. __________________ 14 Dodge 3500 Mega Cab 08 Dodge 3500 Mega Cab 87 Chev 3+3 4x4 80 GMC K10 High Sierra bone stock 70 Chevelle 350SS long term project 68 GMC 3ton Grain Truck/Garbage wagon 50 Pontiac 2 Door Coupe Project "I've got a shotgun rifle and a 4 wheel drive and a country boy can survive" Hank Jr.

04-12-2010, 07:17 AM	#2
CE20934 Senior Member Join Date: Apr 2002 Location: Help! I'm in an office park with its own network of freeways! Posts: 470	Re: Need some help with a 2 speed axle If I remember my bus right, it grounds through the rear end. However, the limit switch was shot when I bought it, so I could only shift into LO. I could shift into HI if I reversed the wires. Obviously that would only work while parked with the shifter assembly removed & grounded directly to the battery. I found a limit switch in a salvage yard V60, and the bus shifted fine after that. Can you shift it at all if you reverse the wires? __________________ '67 C20--427 tall deck/SM420, 4.10 HO52 (Michigan has not been kind to the Old Man) '95 Caprice--355 LT1/T56/3.42 8.5" 10-bolt (daily driver, almost 300k on the chassis) '07 Outback--wife's car. 125k & counting. No head gasket or transmission issues yet. fingers crossed

04-12-2010, 11:10 AM	#3
Blue85 Oilfield Trash Join Date: Sep 2003 Location: Raymore, Sk, Canada, Earth Posts: 3,171	Re: Need some help with a 2 speed axle No , it wont shift at all, switch looks new, there is power at the wires. Thats why i was kinda wondering if there should be a ground wire comin of somewhere __________________ 14 Dodge 3500 Mega Cab 08 Dodge 3500 Mega Cab 87 Chev 3+3 4x4 80 GMC K10 High Sierra bone stock 70 Chevelle 350SS long term project 68 GMC 3ton Grain Truck/Garbage wagon 50 Pontiac 2 Door Coupe Project "I've got a shotgun rifle and a 4 wheel drive and a country boy can survive" Hank Jr.

04-12-2010, 07:02 PM	#4
CE20934 Senior Member Join Date: Apr 2002 Location: Help! I'm in an office park with its own network of freeways! Posts: 470	Re: Need some help with a 2 speed axle How about the switch inside the shifter mechanism on the rear end? That's the one that was shot on my bus. __________________ '67 C20--427 tall deck/SM420, 4.10 HO52 (Michigan has not been kind to the Old Man) '95 Caprice--355 LT1/T56/3.42 8.5" 10-bolt (daily driver, almost 300k on the chassis) '07 Outback--wife's car. 125k & counting. No head gasket or transmission issues yet. fingers crossed



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