looking for a posi - The 1947 - Present Chevrolet & GMC Truck Message Board Network

crm318 · 07-05-2004, 12:16 AM

i have a 72 cheyenne that despratly needs a 12 bolt truck posi. i see them for 300 dollars from eaton. im looking for one of any year for a reasonable price if anyone has one.

jose · 07-05-2004, 02:16 AM

What size gears are you wanting with the posi ? Jose

crm318 · 07-05-2004, 02:19 PM

i have a 3.07 right now but i plan to go with a 3.42 ratio. so i guess i will need the 3.07-3.42 3 series unit

jose · 07-05-2004, 07:33 PM

I do have a 12 bolt posi with the 307 gears . I do want to keep them together 200.00 plus shipping . Jose

crm318 · 07-06-2004, 09:58 PM

it might take a while to come up with. i do think its a great off and i will get back to you

Quagmire · 07-06-2004, 10:08 PM

sorry about the OT, but is that $300 you speak of from eaton, brand new? sounds cheap.

crm318 · 07-07-2004, 04:23 PM

well i see alot of them on ebay brand new for 300+

crm318 · 07-07-2004, 04:24 PM

im looking for a used posi that is out of any trucks that are compatible

Custom 68 · 07-07-2004, 05:34 PM

sent you a PM I have a one I am not sure what year truck it is from I will look at it tonight to see the markings on it. It is a 12 bolt truck series 3. I bought it a year or so and never installed it, my plans (as usual) have changed. I will take 100 dollars plus shipping. I got it from a guy on the board so I dont know much history on it.
Thanks
Dave

FirstGen · 07-08-2004, 12:16 AM

Custom 68, if it will fit 3.73's I'll take it if he doesn't...

crm318 · 07-08-2004, 04:34 PM

3.73 is a 4 series isnt it?

Custom 68 · 07-08-2004, 04:46 PM

yes it requires a series 4 so it will not fit the standard 3.73, it will however fit the "thick" aftermarket 3.73 gear set.
crm318 I have responded to you PM. I will mark it as sold I will get you the shipping weight and have it ready to go.
Thanks
Dave

Quagmire · 07-08-2004, 04:58 PM

i'm confused. so you are saying a stock 3.73 gear has to be used with a 4 series carrier, but you can use an aftermarket 3.73 in a 3 series?

TEXAS 68 · 07-08-2004, 09:05 PM

Quote:

Originally Posted by Quagmire

i'm confused. so you are saying a stock 3.73 gear has to be used with a 4 series carrier, but you can use an aftermarket 3.73 in a 3 series?

ME TOO

Custom 68 · 07-08-2004, 09:18 PM

Quote:

Originally Posted by Quagmire

i'm confused. so you are saying a stock 3.73 gear has to be used with a 4 series carrier, but you can use an aftermarket 3.73 in a 3 series?

http://store.summitracing.com/partde...-43854&view=33
If this link works it lists a 3.73 gear set for the series 3 carrier. This is a special gear again my understanding is that it has a thicker ring gear to space it properly. I have seen them referenced in different catalogs (Summit)
Somebody else chime in with any more info or to set me straight?
But yes the stock 3.73 will not work with this series.
Dave

07-05-2004, 12:16 AM	#1
crm318 Alright Alright Alright Join Date: Mar 2004 Location: Midland, Texas Posts: 1,672	looking for a posi i have a 72 cheyenne that despratly needs a 12 bolt truck posi. i see them for 300 dollars from eaton. im looking for one of any year for a reasonable price if anyone has one. __________________ 1972 Cheyenne Chevrolet red and white 357ci, Vortec heads, GM Performance high rise intake, Comp 268H .454/.454 218/218 110 LSA Quadrajet carb, Flowtech headers, 2.25 40 series HEI, Curve kit, TH 350, 3.07 gears 275/60/15s on 15x8 rallies

07-05-2004, 02:16 AM	#2
jose Registered User Join Date: Feb 2001 Location: Salem , Oregon 97301 Posts: 1,796	What size gears are you wanting with the posi ? Jose __________________ 68 GMC 4x4 SWB jose6772@yahoo.com

07-05-2004, 02:19 PM	#3
crm318 Alright Alright Alright Join Date: Mar 2004 Location: Midland, Texas Posts: 1,672	i have a 3.07 right now but i plan to go with a 3.42 ratio. so i guess i will need the 3.07-3.42 3 series unit __________________ 1972 Cheyenne Chevrolet red and white 357ci, Vortec heads, GM Performance high rise intake, Comp 268H .454/.454 218/218 110 LSA Quadrajet carb, Flowtech headers, 2.25 40 series HEI, Curve kit, TH 350, 3.07 gears 275/60/15s on 15x8 rallies

07-05-2004, 07:33 PM	#4
jose Registered User Join Date: Feb 2001 Location: Salem , Oregon 97301 Posts: 1,796	I do have a 12 bolt posi with the 307 gears . I do want to keep them together 200.00 plus shipping . Jose __________________ 68 GMC 4x4 SWB jose6772@yahoo.com

07-06-2004, 09:58 PM	#5
crm318 Alright Alright Alright Join Date: Mar 2004 Location: Midland, Texas Posts: 1,672	it might take a while to come up with. i do think its a great off and i will get back to you __________________ 1972 Cheyenne Chevrolet red and white 357ci, Vortec heads, GM Performance high rise intake, Comp 268H .454/.454 218/218 110 LSA Quadrajet carb, Flowtech headers, 2.25 40 series HEI, Curve kit, TH 350, 3.07 gears 275/60/15s on 15x8 rallies

07-06-2004, 10:08 PM	#6
Quagmire A splendid one to behold Join Date: Jan 2004 Location: moore, ok Posts: 251	sorry about the OT, but is that $300 you speak of from eaton, brand new? sounds cheap. __________________ 67 swb 02 wrx

07-07-2004, 04:23 PM	#7
crm318 Alright Alright Alright Join Date: Mar 2004 Location: Midland, Texas Posts: 1,672	well i see alot of them on ebay brand new for 300+ __________________ 1972 Cheyenne Chevrolet red and white 357ci, Vortec heads, GM Performance high rise intake, Comp 268H .454/.454 218/218 110 LSA Quadrajet carb, Flowtech headers, 2.25 40 series HEI, Curve kit, TH 350, 3.07 gears 275/60/15s on 15x8 rallies

07-07-2004, 04:24 PM	#8
crm318 Alright Alright Alright Join Date: Mar 2004 Location: Midland, Texas Posts: 1,672	im looking for a used posi that is out of any trucks that are compatible __________________ 1972 Cheyenne Chevrolet red and white 357ci, Vortec heads, GM Performance high rise intake, Comp 268H .454/.454 218/218 110 LSA Quadrajet carb, Flowtech headers, 2.25 40 series HEI, Curve kit, TH 350, 3.07 gears 275/60/15s on 15x8 rallies

07-07-2004, 05:34 PM	#9
Custom 68 Registered User Join Date: Nov 2001 Location: Springfield, MO Posts: 2,928	sent you a PM I have a one I am not sure what year truck it is from I will look at it tonight to see the markings on it. It is a 12 bolt truck series 3. I bought it a year or so and never installed it, my plans (as usual) have changed. I will take 100 dollars plus shipping. I got it from a guy on the board so I dont know much history on it. Thanks Dave __________________ Dave 1968 Custom Chevy with turbo charged 5.3 gen III 4l80e swap 1967-71 GMC 3/4 ton long step 4x4 (not sure what year exactly?) "A good friend will bail you out of jail...but a true friend will be sitting next to you saying "that was frekin awesome". "If it doesn't fit force it...If it breaks then it needed to be replaced anyway!"

07-08-2004, 12:16 AM	#10
FirstGen Just Don't Stop! Join Date: Feb 2004 Location: Dallas Posts: 1,239	Custom 68, if it will fit 3.73's I'll take it if he doesn't... __________________ 1968 C10 build in process TT LSA/6L90e/9"

07-08-2004, 04:34 PM	#11
crm318 Alright Alright Alright Join Date: Mar 2004 Location: Midland, Texas Posts: 1,672	3.73 is a 4 series isnt it? __________________ 1972 Cheyenne Chevrolet red and white 357ci, Vortec heads, GM Performance high rise intake, Comp 268H .454/.454 218/218 110 LSA Quadrajet carb, Flowtech headers, 2.25 40 series HEI, Curve kit, TH 350, 3.07 gears 275/60/15s on 15x8 rallies

07-08-2004, 04:46 PM	#12
Custom 68 Registered User Join Date: Nov 2001 Location: Springfield, MO Posts: 2,928	yes it requires a series 4 so it will not fit the standard 3.73, it will however fit the "thick" aftermarket 3.73 gear set. crm318 I have responded to you PM. I will mark it as sold I will get you the shipping weight and have it ready to go. Thanks Dave __________________ Dave 1968 Custom Chevy with turbo charged 5.3 gen III 4l80e swap 1967-71 GMC 3/4 ton long step 4x4 (not sure what year exactly?) "A good friend will bail you out of jail...but a true friend will be sitting next to you saying "that was frekin awesome". "If it doesn't fit force it...If it breaks then it needed to be replaced anyway!"

07-08-2004, 04:58 PM	#13
Quagmire A splendid one to behold Join Date: Jan 2004 Location: moore, ok Posts: 251	i'm confused. so you are saying a stock 3.73 gear has to be used with a 4 series carrier, but you can use an aftermarket 3.73 in a 3 series? __________________ 67 swb 02 wrx



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