Eaton 3/4 ton Locker question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**Joesjunk** · 07-29-2013, 04:05 PM

I have a 4:57 Locker out of a 72 3/4 ton and was wanting to know if you can use the locker part with a 4:10 gear. Thanks

SS Tim · 07-29-2013, 04:31 PM

Joe, The NoSpin replaces the spider gears and cross shafts inside the differential case. So yes it is an easy swap, pull it down, split the case, dump out the guts and install the NoSpin. Take a look in the factory overhaul manual for more details.
http://67-72chevytrucks.com/vboard/s...d.php?t=558016

**kwmech** · 07-29-2013, 06:08 PM

If the case splits apart to get at the actual locker, make sure you use a threaded rod as in the pic to hold the unit together when you split the case. Also before splitting the case look for some index marks so when going back together you get it indexed correctly. It'll be ....usually... an X marking the alignment. If the case does not split apart, you'll have to look for another unit with the correct ring gear offset

07-29-2013, 04:05 PM	#1
Joesjunk Senior Member Join Date: May 2001 Location: Independence MO. Posts: 7,726	Eaton 3/4 ton Locker question I have a 4:57 Locker out of a 72 3/4 ton and was wanting to know if you can use the locker part with a 4:10 gear. Thanks __________________ 72 3/4t Custom Deluxe 402/auto 66k Original paint 71 3/4t 4x4 Custom Deluxe 10k original miles Original paint 71 3/4t Cheyenne 402 70k original paint 72 3/4t 4x4 Custom deluxe 72 3/4t 4x4 Custom deluxe 91k original paint 72 Cheyenne/30 Dually 69 Camaro SS396 4-speed 13 GMC 2500HD Duramax I bought new 05 Jeep Wrangler "Willys Edition" 12k miles (I bought new) 85 3/4 ton 4x4 Scottsdale 33k miles original paint 86 1 ton 4x4 SRW Silverado 454 restored 80 1 ton 4x4 SRW Silverado 9,434 original miles!! original paint 95 GMC 1 ton dually 4x4 my dad bought new 95 GMC 3/4 ton 4x4, regular cab 454, 31k original miles 2002 2500HD 4x4 regular cab 6.0L 67k miles 2002 2500HD 4x4 regular cab 8.1L 28k miles 2003 GMC 2500HD 4x4 regular cab Diesel 93k miles 67-72 Parts for sale

07-29-2013, 04:31 PM	#2
SS Tim Registered User Join Date: Aug 2010 Location: Edwards, CA Posts: 7,507	Re: Eaton 3/4 ton Locker question Joe, The NoSpin replaces the spider gears and cross shafts inside the differential case. So yes it is an easy swap, pull it down, split the case, dump out the guts and install the NoSpin. Take a look in the factory overhaul manual for more details. http://67-72chevytrucks.com/vboard/s...d.php?t=558016 Attached Images __________________ Thanks, Tim * VIN/Model Decoders * Power Team Charts (engine/transmission/gear ratio) * Post Your Pickup SPID Blazer SPID Suburban/Panel SPID * RTFM ... Read The Factory Manuals... download 'em here Highlanders Do you have a 1972 Plaid Pickup? Plaid Blazer ** Plaid Suburban

07-29-2013, 06:08 PM	#3
kwmech Senior Member Join Date: Mar 2003 Location: Colfax-California Posts: 8,724	Re: Eaton 3/4 ton Locker question If the case splits apart to get at the actual locker, make sure you use a threaded rod as in the pic to hold the unit together when you split the case. Also before splitting the case look for some index marks so when going back together you get it indexed correctly. It'll be ....usually... an X marking the alignment. If the case does not split apart, you'll have to look for another unit with the correct ring gear offset

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