'72 K20 rear ends? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Niko · 05-28-2003, 11:28 AM

Howdy to all, I just blew the rear in my 72 K20 yesterday. Haven't got it apart yet. I beleive its an eaton. I'm new to this chevy stuff so any help on identification and location of used parts would be helpful.
Thanks, Niko

**CPNE** · 05-28-2003, 12:06 PM

If it's a Chevy it's probably an Eaton. If it's a GMC it's probably a Dana 60. An eaton has a round pumpkin and a drop out 3rd member. The dana has an irregular shaped diff cover.

If it's an eaton and you problem is with the 3rd member, you can swap in another 3rd member from either a 2wd or 4wd eaton equipped truck. Most 3/4 ton 67-72 chevys came with them. Most common ratio is 4:11, though 4:56 was available.

Best to find a replacement close by as these are heavy to ship.

Niko · 05-28-2003, 12:11 PM

Yeah it's a round pumpkin with a 10 bolt cover, I'm tearin into it tomorrow so I'll know more then.
Thank's CPNE for the advise
Niko

05-28-2003, 11:28 AM	#1
Niko Registered User Join Date: May 2003 Location: Klamath Falls, Oregon Posts: 7	'72 K20 rear ends? Howdy to all, I just blew the rear in my 72 K20 yesterday. Haven't got it apart yet. I beleive its an eaton. I'm new to this chevy stuff so any help on identification and location of used parts would be helpful. Thanks, Niko

05-28-2003, 12:06 PM	#2
CPNE Resident Curmudgeon Join Date: Dec 1999 Location: NH Posts: 6,662	If it's a Chevy it's probably an Eaton. If it's a GMC it's probably a Dana 60. An eaton has a round pumpkin and a drop out 3rd member. The dana has an irregular shaped diff cover. If it's an eaton and you problem is with the 3rd member, you can swap in another 3rd member from either a 2wd or 4wd eaton equipped truck. Most 3/4 ton 67-72 chevys came with them. Most common ratio is 4:11, though 4:56 was available. Best to find a replacement close by as these are heavy to ship. __________________ Currently on or near the homestead: 67 Chevy SWB 2WD stepside 350/3 on tree (Pat's) 67 GMC SWB 2WD Fleet 402/auto (Brian's under construction) 67 Chevy 3/4 ton 2WD 402/auto (Business Hauler) 67 Chevy 1 ton dually 2WD 396/4 speed (Former business hauler, Needs TLC) 68 Chevy 1/2 ton Suburban 2WD 250 six/3 on tree (Brian's Needs TLC) 70 Chevy 3/4 ton 4WD 350/4 speed (Pat's - Disguised as a 68 GMC) 71 Chevy SWB stepside (Crushed by tree - parts donor) 72 Chevy 3/4 ton 4WD (Parts donor) 72 Chevy 3/4 ton 4WD Suburban (Parts Donor) 72 GMC 3/4 ton 4WD 292 six/4 speed (Mine - Disguised as a 67 GMC) 81 GMC 4WD Dually Dump Body 350/4 speed (Business Hauler) 82 Camaro Z/28 355/Super T-10 (Pat's toy) 93 Caprice 9C1 (Brian's Cop Car) 02 Toyota Camry (Reliable but a souless steel and plastic hulk) 2011 2SS RS Camaro M6 Factory Hurst Shifter Maybe I need to sell some of this crap Yet another Bozo with a sawz-all

05-28-2003, 12:11 PM	#3
Niko Registered User Join Date: May 2003 Location: Klamath Falls, Oregon Posts: 7	Yeah it's a round pumpkin with a 10 bolt cover, I'm tearin into it tomorrow so I'll know more then. Thank's CPNE for the advise Niko



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