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#848733 - Fri May 04 2012 02:19 AM Help wiring for Eaton 2 speed axle  
GMCPic  Offline
Shop Shark
Joined: Apr 2001
Posts: 478
Paradise,CA,USA
Any and All,

I need to replace the shifter switch for my 454-30 dump truck. Switch is broken and crumbling.

I found a new switch on eBay, but no wiring diagram. Wires are in 3 different sections/pieces none of which are connected.

Anyone have the diagram to wire up a electric shift 2 speed. Circa 1952.

Thanx, wink
GMCPic



Dance like no one is watching,
Sing like no one is listening,
Love like you've never been hurt.

1948 GMC FC101 1/2t Pickup w/270 and SM420
1948 GMC FC253 1t Factory 80"x9' Flatbed Dually
1948 Chevy COE 2 Ton 8'x15' Flatbed
1950 GMC 354-24 2 Ton 8'X12' Flatbed w/Dump Hoist
1953 GMC 454-30 3 Ton 8'x14' Flatbed w/Dump Hoist
1953 GMC 454-30 3 Ton Cab and Chassis
1942 Clarkator 6 MILL-44 Heavy Aircraft Tug
1942 Ford (9N) Moto Tug with 1/2 yard Loader
1947 Oliver OC3 HG-42 Tract-Crawler Bull Dozier w/6' Blade


#848764 - Fri May 04 2012 03:23 AM Re: Help wiring for Eaton 2 speed axle [Re: GMCPic]  
Mike B  Offline
Shop Shark
Joined: Mar 2004
Posts: 3,380
Hughesville, MD
GMCPix,

I assume you have the Red push/pull switch...

The switch is wired as follows;

Green = 12v from the Fuse Panel

Red = High Rear

Black = Low Rear

The Black wire will be Tee taped under the floor with a wire that goes up to the speedometer adaptor located at the dash. The adaptor keeps the speedometer accurate regardless of what speed the rear is in, it's a little electric reduction unit in-line with the speedometer cable.

Make sure you ground both the electric shift motor and the adaptor...

That's it!

Mike B smile

Last edited by Mike B; Fri May 04 2012 03:24 AM.

#869023 - Tue Jul 24 2012 06:03 AM Re: Help wiring for Eaton 2 speed axle [Re: Mike B]  
GMCPic  Offline
Shop Shark
Joined: Apr 2001
Posts: 478
Paradise,CA,USA
Got bigger problems now with shift unit.

When I hookup the switch and turn on key/power I get power to both terminals. Even when I disconnect one wire from switch terminal block.

Wires are totally rotten, crumble when touched.

So now I have to rewire the whole shift system.

Also, I am going to look into changing the shift motor too 12v.

Any ideas?


Dance like no one is watching,
Sing like no one is listening,
Love like you've never been hurt.

1948 GMC FC101 1/2t Pickup w/270 and SM420
1948 GMC FC253 1t Factory 80"x9' Flatbed Dually
1948 Chevy COE 2 Ton 8'x15' Flatbed
1950 GMC 354-24 2 Ton 8'X12' Flatbed w/Dump Hoist
1953 GMC 454-30 3 Ton 8'x14' Flatbed w/Dump Hoist
1953 GMC 454-30 3 Ton Cab and Chassis
1942 Clarkator 6 MILL-44 Heavy Aircraft Tug
1942 Ford (9N) Moto Tug with 1/2 yard Loader
1947 Oliver OC3 HG-42 Tract-Crawler Bull Dozier w/6' Blade

#869260 - Wed Jul 25 2012 01:48 AM Re: Help wiring for Eaton 2 speed axle [Re: GMCPic]  
Mike B  Offline
Shop Shark
Joined: Mar 2004
Posts: 3,380
Hughesville, MD
GMCPic,

The switch and switch harness are still available new from Eaton. The switch is part number 32861 (about $10), I can't find the harness number. I think I got one from NAPA about a year ago.

The center terminal on the switch gets the hot wire from the fuse block. The top terminal is High speed and the bottom is Low.

Mike B smile


#869274 - Wed Jul 25 2012 03:15 AM Re: Help wiring for Eaton 2 speed axle [Re: Mike B]  
GMCPic  Offline
Shop Shark
Joined: Apr 2001
Posts: 478
Paradise,CA,USA
Found some parts on ebay for old style Eaton 2 speed.

Now I have to find out if they will work.

Also I found another truck on Craig's list.

Going to look at it Sat.


Dance like no one is watching,
Sing like no one is listening,
Love like you've never been hurt.

1948 GMC FC101 1/2t Pickup w/270 and SM420
1948 GMC FC253 1t Factory 80"x9' Flatbed Dually
1948 Chevy COE 2 Ton 8'x15' Flatbed
1950 GMC 354-24 2 Ton 8'X12' Flatbed w/Dump Hoist
1953 GMC 454-30 3 Ton 8'x14' Flatbed w/Dump Hoist
1953 GMC 454-30 3 Ton Cab and Chassis
1942 Clarkator 6 MILL-44 Heavy Aircraft Tug
1942 Ford (9N) Moto Tug with 1/2 yard Loader
1947 Oliver OC3 HG-42 Tract-Crawler Bull Dozier w/6' Blade


Moderated by  69Cuda, Grigg 

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