4.10/4.11 gear question? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Americanrider · 02-17-2005, 07:37 PM

When did the change come about, which is newer?

Robert1970C20rstbukt · 02-17-2005, 07:52 PM

I think that only the Dana rear ends had 4.10s and the Corporate/Eaton rear ends had the 4.11s. I've got the original Corp/Eaton rear in my truck and it has 4.11's.

LONGHAIR · 02-17-2005, 08:24 PM

The difference is in the gear teeth.
4.10 is 41-10
4.11 is 37-9

They were used it different housings.
4.10 was in the 8.5" Corporate they were used in:
77-87 K10 and K20 front
77-91 K5 front
80-02 C/K10 and K5 rear

4.10 was also used in 8.875 (12 bolt) truck
64-82 K5 K10 K20 rear

4.10 was aslo used in Dana44 axles
67-76 K10 K20 front (though the ending year is not absolute, they used what they had)

4.11 was a Chevrolet car ratio in the 10 bolt versions.
12 bolt cars are available with either depending upon application or brand.

4.11 was also a 9" Ford ratio.

The ratio difference is unimportant......many trucks have slightly different ratios front to rear.

Purs · 02-17-2005, 08:41 PM

FWIW, I heard the 4.10 ring and pinion gear was stronger, can't remember why. I think the number of teeth on the pinion...

**JIMs70GMC** · 02-17-2005, 09:38 PM

don't forget about 4.09s, also has to do with thin and thick gear sets around the carrier breaks.

GreyHoundSteve · 02-18-2005, 10:43 AM

Ive heard that trucks got 4:10 and cars got 4:11 as a rule of thumb. My 67 c10 has 4:10's in the 12 bolt factory rear.

1969 GMC · 02-18-2005, 11:03 AM

it just depends on the axle. like previously said, the Eaton has 4.11 gears instead of 4.10, and it also has 4.57's instead of the normal 4.56's, and 5.14's instead of 5.13's.

*wolfthing2000* · 02-18-2005, 01:16 PM

I pulled a 72 eaton axle from a wrecking yard and the gear count is 41 and 10

*wolfthing2000* · 02-18-2005, 05:37 PM

so the corporate eaton drop out style also came with 4.10s

02-17-2005, 07:37 PM	#1
Americanrider Registered User Join Date: Dec 2004 Location: NW, WA. Posts: 1,421	4.10/4.11 gear question? When did the change come about, which is newer?

02-17-2005, 07:52 PM	#2
Robert1970C20rstbukt Registered User Join Date: Jun 2004 Location: Beeville, Texas Posts: 1,943	I think that only the Dana rear ends had 4.10s and the Corporate/Eaton rear ends had the 4.11s. I've got the original Corp/Eaton rear in my truck and it has 4.11's. __________________ RJD 1984 Chevrolet C30 welding truck 454/SM465 1977 GMC C15 pickup 350/TH350 1970 Chevrolet C20 pickup 350/TH400 1970 Chevrolet K20 Suburban 454/TH350 1969 GMC 8500 478M V6/5 spd winch truck

02-17-2005, 08:41 PM	#4
Purs Got Big Block? Join Date: Apr 2000 Location: West Texas Posts: 1,510	FWIW, I heard the 4.10 ring and pinion gear was stronger, can't remember why. I think the number of teeth on the pinion... __________________ "Experience is what you get when you didn't get what you wanted."

02-17-2005, 09:38 PM	#5
JIMs70GMC user # 2756 Join Date: Jun 2001 Location: Chesapeake, Virginia Posts: 4,612	don't forget about 4.09s, also has to do with thin and thick gear sets around the carrier breaks. __________________ 1970 K25, 8' stepside bed 350/465/205 44 up front, 60 in the rear 4.10s rolling on 33" Dunlop MTs 1986 K5, 350/465/208 Dana 60/14 bolt from a cucv 36" Super Swampers TSL/SX 1983 K20 w/ CUCV axles, 350/700R4/208 sitting on 37" Goodyears 1986 M1031 6.2 diesel, TH400/NP205 locker in the rear and a LS in the front, all stock for now..... 1986 K30, 350/400/205 dana 60 and 14 bolt. I kept the drivetrain. Body/bad and chassis are gone. 1981 K30, 350/465/205 dana 60 and dually 14 bolt. Has a G80, and a flat bed. Going to replace the flat bed. 1985 K20, 350/400/208 10 bolt and SF 14 bolt. I wonder where I can find some 1 tons. Hmmmmm

02-18-2005, 11:03 AM	#7
1969 GMC Registered User Join Date: Feb 2003 Location: The Rubber City Posts: 5,498	it just depends on the axle. like previously said, the Eaton has 4.11 gears instead of 4.10, and it also has 4.57's instead of the normal 4.56's, and 5.14's instead of 5.13's. __________________ 1969 GMC K2500 1996 Honda Accord 2007 Kawasaki KLR 650

02-17-2005, 08:24 PM	#3
LONGHAIR just can't cover up my redneck Join Date: May 2004 Location: Columbus OH Posts: 11,414	The difference is in the gear teeth. 4.10 is 41-10 4.11 is 37-9 They were used it different housings. 4.10 was in the 8.5" Corporate they were used in: 77-87 K10 and K20 front 77-91 K5 front 80-02 C/K10 and K5 rear 4.10 was also used in 8.875 (12 bolt) truck 64-82 K5 K10 K20 rear 4.10 was aslo used in Dana44 axles 67-76 K10 K20 front (though the ending year is not absolute, they used what they had) 4.11 was a Chevrolet car ratio in the 10 bolt versions. 12 bolt cars are available with either depending upon application or brand. 4.11 was also a 9" Ford ratio. The ratio difference is unimportant......many trucks have slightly different ratios front to rear.

02-18-2005, 10:43 AM	#6
GreyHoundSteve Registered User Join Date: Oct 2004 Location: DFW TX Posts: 769	Ive heard that trucks got 4:10 and cars got 4:11 as a rule of thumb. My 67 c10 has 4:10's in the 12 bolt factory rear.

02-18-2005, 01:16 PM	#8
wolfthing2000 Account Suspended Join Date: Oct 2004 Posts: 1,276	I pulled a 72 eaton axle from a wrecking yard and the gear count is 41 and 10

02-18-2005, 05:37 PM	#9
wolfthing2000 Account Suspended Join Date: Oct 2004 Posts: 1,276	so the corporate eaton drop out style also came with 4.10s



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