Wanted: 3.73 or 4.11 gear set - The 1947 - Present Chevrolet & GMC Truck Message Board Network

harshard · 08-26-2009, 09:45 PM

Anyone out there have a used set of 3.73 or 4.11 gears in good shape that will fit a factory 1971 chevy truck 12 bolt with 3.08 gears. I know i can purchas thru summit/jegs , but looking to save as much $$ as possible. Thanks Shawn

*Shane* · 08-26-2009, 09:48 PM

What are you looking to spend? I ask because I have a set of NOS 3.73 gears still in the GM box - never had gear dope on them.

PM me if interested as I don't check the parts board that often and may not see your reply.

71Burb · 08-27-2009, 01:22 AM

You will need a spacer or a "thick" ring gear set. Your diff is a "series 3" which came with gear ratios up to 3.42:1. Ratio's from 3.73 and up were installed in a "series 4" housing. I have a good used set of 3.73s and a spacer (made by Mr. Gasket). Let me know if you are interested. /Al

**88JRFAN** · 08-27-2009, 07:07 PM

I also have a 3:73 gear set, it has some slight wear, but in real good shape. 65.00 plus shipping.

harshard · 08-27-2009, 07:14 PM

Daren, what would shipping cost for 75142. Do you have pictures? Shawn

**88JRFAN** · 08-27-2009, 07:16 PM

Quote:

Originally Posted by harshard

Daren, what would shipping cost for 75142. Do you have pictures? Shawn

Will check on shipping. Yes i have some pics, will get them up.

**88JRFAN** · 08-27-2009, 07:25 PM

77.41 with shipping. Here is a pic. "

"

harshard · 08-27-2009, 07:47 PM

Daren, will they work in my diff. case or will I need a spacer like Al said above?

**88JRFAN** · 08-27-2009, 08:00 PM

Probably, but not for sure. I actually bought the gear from a member on the board.

harshard · 08-27-2009, 08:18 PM

Well I need to be for sure, i dont want to buy something that will not fit.

harshard · 08-27-2009, 08:27 PM

Al, you seem to know exactly what will work in my diff. case. What would you let the gear set and spacer go for and what would it cost to ship to 75142?

69 longhorn · 08-27-2009, 11:27 PM

71 burb told you "square"....you need a spacer, or a thick ring to run a 3.73 or 4.10 on a 3 series carrier. The break on the carrier is 2.76?- 3.42 on a 3 series carrier. 4 series goes (factory) 3.73/4.10/4.56, ect. Not to try to step on toes, but personally, I would run a thick ring (3 series 3.73 or 4.10), or opt for a 4 series Eaton posi + gears. Best of luck,crazyAL

71Burb · 08-28-2009, 12:26 AM

Thanks 69 Longhorn. Do you know how to tell the difference between a 3 / 4 series eaton posi. I bought a carrier, it has 30060 cast # but I haven't found any info online re how to tell one from the other? Sorry, did not intend to hi jack your thread! /Al

08-26-2009, 09:45 PM	#1
harshard Registered User Join Date: Aug 2008 Location: Kaufman,Texas Posts: 102	Wanted: 3.73 or 4.11 gear set Anyone out there have a used set of 3.73 or 4.11 gears in good shape that will fit a factory 1971 chevy truck 12 bolt with 3.08 gears. I know i can purchas thru summit/jegs , but looking to save as much $$ as possible. Thanks Shawn Last edited by harshard; 08-26-2009 at 10:58 PM.

08-26-2009, 09:48 PM	#2
Shane Account Suspended Join Date: Jun 2000 Location: over yonder Posts: 14,270	Re: Wanted: 3.73 or 4.11 gear set What are you looking to spend? I ask because I have a set of NOS 3.73 gears still in the GM box - never had gear dope on them. PM me if interested as I don't check the parts board that often and may not see your reply. Last edited by Shane; 08-26-2009 at 09:49 PM.

08-27-2009, 01:22 AM	#3
71Burb Registered User Join Date: Dec 1999 Location: Calgary,Alberta,Canada Posts: 70	Re: Wanted: 3.73 or 4.11 gear set You will need a spacer or a "thick" ring gear set. Your diff is a "series 3" which came with gear ratios up to 3.42:1. Ratio's from 3.73 and up were installed in a "series 4" housing. I have a good used set of 3.73s and a spacer (made by Mr. Gasket). Let me know if you are interested. /Al __________________ Al from Calary. 72 Chev S/B Ground Up Project.

08-27-2009, 07:07 PM	#4
88JRFAN LET'S GO RACIN' Join Date: Oct 2007 Location: SALINA,KS Posts: 1,212	Re: Wanted: 3.73 or 4.11 gear set I also have a 3:73 gear set, it has some slight wear, but in real good shape. 65.00 plus shipping. __________________ Daren 04 Chevy Extend cab 2500HD 6.0 Liter 4x4 71 CHEVY 3/4 4X4 402 BB, th400/np205, dana44/eaton ho52 w/4:10-TOY Rip El Jay RIP BOBBO'S MOM

08-27-2009, 07:14 PM	#5
harshard Registered User Join Date: Aug 2008 Location: Kaufman,Texas Posts: 102	Re: Wanted: 3.73 or 4.11 gear set Daren, what would shipping cost for 75142. Do you have pictures? Shawn

08-27-2009, 07:25 PM	#7
88JRFAN LET'S GO RACIN' Join Date: Oct 2007 Location: SALINA,KS Posts: 1,212	Re: Wanted: 3.73 or 4.11 gear set 77.41 with shipping. Here is a pic. "" __________________ Daren 04 Chevy Extend cab 2500HD 6.0 Liter 4x4 71 CHEVY 3/4 4X4 402 BB, th400/np205, dana44/eaton ho52 w/4:10-TOY Rip El Jay RIP BOBBO'S MOM

08-27-2009, 07:47 PM	#8
harshard Registered User Join Date: Aug 2008 Location: Kaufman,Texas Posts: 102	Re: Wanted: 3.73 or 4.11 gear set Daren, will they work in my diff. case or will I need a spacer like Al said above?

08-27-2009, 08:00 PM	#9
88JRFAN LET'S GO RACIN' Join Date: Oct 2007 Location: SALINA,KS Posts: 1,212	Re: Wanted: 3.73 or 4.11 gear set Probably, but not for sure. I actually bought the gear from a member on the board. __________________ Daren 04 Chevy Extend cab 2500HD 6.0 Liter 4x4 71 CHEVY 3/4 4X4 402 BB, th400/np205, dana44/eaton ho52 w/4:10-TOY Rip El Jay RIP BOBBO'S MOM

08-27-2009, 08:18 PM	#10
harshard Registered User Join Date: Aug 2008 Location: Kaufman,Texas Posts: 102	Re: Wanted: 3.73 or 4.11 gear set Well I need to be for sure, i dont want to buy something that will not fit.

08-27-2009, 08:27 PM	#11
harshard Registered User Join Date: Aug 2008 Location: Kaufman,Texas Posts: 102	Re: Wanted: 3.73 or 4.11 gear set Al, you seem to know exactly what will work in my diff. case. What would you let the gear set and spacer go for and what would it cost to ship to 75142?

08-27-2009, 11:27 PM	#12
69 longhorn Registered User Join Date: Aug 2001 Location: rock island,il,usa Posts: 5,382	Re: Wanted: 3.73 or 4.11 gear set 71 burb told you "square"....you need a spacer, or a thick ring to run a 3.73 or 4.10 on a 3 series carrier. The break on the carrier is 2.76?- 3.42 on a 3 series carrier. 4 series goes (factory) 3.73/4.10/4.56, ect. Not to try to step on toes, but personally, I would run a thick ring (3 series 3.73 or 4.10), or opt for a 4 series Eaton posi + gears. Best of luck,crazyAL __________________ http://community.webshots.com/user/hotrodhorn

08-28-2009, 12:26 AM	#13
71Burb Registered User Join Date: Dec 1999 Location: Calgary,Alberta,Canada Posts: 70	Re: Wanted: 3.73 or 4.11 gear set Thanks 69 Longhorn. Do you know how to tell the difference between a 3 / 4 series eaton posi. I bought a carrier, it has 30060 cast # but I haven't found any info online re how to tell one from the other? Sorry, did not intend to hi jack your thread! /Al __________________ Al from Calary. 72 Chev S/B Ground Up Project.

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.