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Mod | | | Forums66 Topics128,068 Posts1,055,880 Members48,428 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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| | | | Joined: Dec 2002 Posts: 86 Wrench Fetcher | | Wrench Fetcher Joined: Dec 2002 Posts: 86 | I was cleaning the rearend of my dump truck last nite. And i noticed next to the driveshaft yoke on the rearend is a (for lack of words)a metal unit. It said, Eaton 12v. Is this a two speed rearend. If so how hard is it to hook up.
47.5 Loadmaster 5 window
48 Chevy 3600
69 GTO convertible
| | | | | Joined: Jul 2003 Posts: 85 Member | | Member Joined: Jul 2003 Posts: 85 | got a picture? My 44 has a 52 rear 2-speed, but it's vacuum shift, so it was pretty obvious, big round vacuum diaphram on a sqaure box in front of the differential... I've got pics of mine if it would help... About halfway down page -Mike R. | | | | | Joined: May 2001 Posts: 709 Shop Shark | | Shop Shark Joined: May 2001 Posts: 709 | Funny. Tell my teen son sometimes he has a two speed rearend. Slooow and slooower.  Sorry, couldn't resist that one..
Bruce
Old Toy: Ol' Betsy stock 59 Apache SB Stepside (Gone but not Forgotten)
New Toy: 1962 Impala SS Coupe
The Driver: 1990 Toyota truck
| | | | | Joined: Dec 2002 Posts: 86 Wrench Fetcher | | Wrench Fetcher Joined: Dec 2002 Posts: 86 | Mike, Its in the same spot but it does not have a vacuum canister. Its more of a square box
47.5 Loadmaster 5 window
48 Chevy 3600
69 GTO convertible
| | | | | Joined: Feb 2004 Posts: 29,777 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,777 | Yes, it's a 2-speed. It is one of the later-model units that shifts with an electric motor rather than vacuum. They're not as smooth as the vacuum-shift types, but they're a little more reliable. You'll need a 2-position switch on the shift handle that swaps the hot and ground to the motor, and some wiring back to the rear end. I think I've got a wiring diagram in one of my truck manuals at the farm. Drop me an email when I get back there this weekend, and I'll scan you a copy.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
| | | | | Joined: Dec 2002 Posts: 86 Wrench Fetcher | | Wrench Fetcher Joined: Dec 2002 Posts: 86 | Thanks for the help everyone. Jerry sent the E-mail
Thanks. Ray
47.5 Loadmaster 5 window
48 Chevy 3600
69 GTO convertible
| | | | | Joined: Sep 2004 Posts: 235 Shop Shark | | Shop Shark Joined: Sep 2004 Posts: 235 | Maybe you can find an old truck in the junk yard with a two speed and grab everything you need, switch, plug and wires. don't forget the mounting bracket. | | | | | Joined: Dec 2002 Posts: 86 Wrench Fetcher | | Wrench Fetcher Joined: Dec 2002 Posts: 86 |
47.5 Loadmaster 5 window
48 Chevy 3600
69 GTO convertible
| | | | | Joined: Mar 2004 Posts: 6,214 'Bolter | | 'Bolter Joined: Mar 2004 Posts: 6,214 | If you find a truck that had an Eaton 2-speed electric shift, don't forget to get the speedometer reduction adaptor. It's a little round unit that screws inline with the cable on the back of the speedometer. It will have one electric terminal that gets 12v when you shift to High Gear this will keep your speedometer/odometer calibrated regardless of range. All Eaton 2-speed rears have the same reduction multiplier (1.36), so any truck with one will work. The High ratio will be stamped on the front of your rear. Multiply that number to find the low ratio (ie. 6.14 high has a 8.35 low).
Regards,
Mike Boteler
'56 4400 Stake
'56 6400 Stake
'56 8400 Wrecker w/Holmes 525
'56 9200 Tractor w/Allison Automatic
'57 10500 Fire Truck
Hughesville, MD | | | | | Joined: Dec 2002 Posts: 86 Wrench Fetcher | | Wrench Fetcher Joined: Dec 2002 Posts: 86 |
47.5 Loadmaster 5 window
48 Chevy 3600
69 GTO convertible
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