wtb: Posi/Limited Slip - The 1947 - Present Chevrolet & GMC Truck Message Board Network

72superBB · 12-08-2003, 03:00 PM

I am looking for the parts to make my 72 12 bolt one wheel wonder into a posi. I need the parts to do this. I have a budget, but not enogh of one to buy a new eaton. I live in Norther Ok and can drive to get it depending on the distance.

thanks

Ron

**JQ-72** · 12-09-2003, 01:37 AM

I have a 3.08 posi out of a 72 Cheyenne Super. $300 in North Alabama.

Joshua

72superBB · 12-09-2003, 01:39 AM

Is that for the insides or the whole axle?

What do you think it would cost to ship? That is farther that what I was wanting to drive.

thanks

Ron

imdarren · 12-09-2003, 03:13 AM

I can't speak for JQ-72, but
I'm sure that for $300 you get the whole rear end.
If it was just the carrier / posi unit, you could get a new one from Eaton for not a bunch more.
As for shipping . . . .
That would kill ya. That would push up the total cost too close to what you could buy a new Eaton posi third member.

Darren

**JQ-72** · 12-09-2003, 11:39 AM

Yeah, 300 for the complete rear end. I would rather not part it out.

Joshua

72superBB · 12-09-2003, 02:28 PM

Sure wish I was closer to the two guys in Alabama that have one. I would take either on of them if I could get it here closer.

Ron

**DANTIP** · 12-11-2003, 06:39 PM

I have a 5-lug coil spring posi rear with new Richmond gears (3:73), new bearings, seals wheel cylinders, and studs. I sold the truck I intended to install it in a year ago, and I am tired of tripping over it in my garage. I live in the Kansas City area and will make a hell of a deal to move it. Please e-mail me if interested.

Dan Tippmann
dtippmann@aol.com

kilomanjaro · 12-12-2003, 01:42 PM

I have a 12 bolt 3:08 POSI rear out of a 72, I am located in manhattan, ks but would drive to meet you half way for my cost of gas. I am asking 275 for it. It is complete drum to drum. Let me know if you would be interested.
John
kilomanjaro63@hotmail.com

72superBB · 12-12-2003, 03:19 PM

What will be better for driving on a highway? THe 3.73 or the 3.08? Not that a 402 bb is the best highway vehicle, but what is the difference that I would notice?

thanks

1971 Cheyenne · 12-12-2003, 04:20 PM

The 3.08 gears will be MUCH better for highway cruising...

72superBB · 12-12-2003, 07:16 PM

What do you lose at the get go, or off the line I mean, with the different gears?

Thanks

jmanz69 · 12-12-2003, 08:51 PM

The 3.73 is faster off the line, but the 3.08 will give you better gas mileage. The 3.08 will be more of a dog off the line unless you have a strong BB, then you will be able to pull it ok. Still not as good as the 3.73. Depends on what you want to use the truck for. If you do mostly highway, you should go with the 3.08, if you want to do stoplight races, then go with the 3.73.

1971 Cheyenne · 12-12-2003, 09:11 PM

my truck has 3.07's, and unless you are doing alot of stoplight/drag racing, I would go for the 3.07's. My truck definately isn't a dog off of the line, but it's not fast either. They will give you much better gas mileage, and better freeway cruising (lower rpms). If you want gears that will get you off the line quick, but will make it less economical and comfortable driving on the freeway...

Huck · 12-13-2003, 10:20 AM

Ron, the other thing to consider is trailering and gas mileage. If you plan to do a lot of pulling ----flatbed, boat, or other heavy stuff, the 373 gears will make that a bit easier. Actually the best overall gears I've seen are the 354 gears as they give you a great compromise.
I use 308 posi with a 5 speed. I can pull most hills fine but need to go to 4th on the steep long ones or when pulling a heavy trailer. This is with a mild 350. A big block should handle the 308's just fine in almost any application.
If you expect to do a bit of highway driving, the 308 will give you max gas mileage potential. I would expect the difference to be at least 2-3 mpg difference on the highway.
You might want to check to see what you are running right now gear wise. I would suspect a stock BB to have 307/8s so going to a 373 would give you a easier, faster, more torque start. At 75 though, you will wish for the 308 and vice versa!! No simple solution.

12-08-2003, 03:00 PM	#1
72superBB Registered User Join Date: Nov 2003 Location: Mandan, ND Posts: 422	wtb: Posi/Limited Slip I am looking for the parts to make my 72 12 bolt one wheel wonder into a posi. I need the parts to do this. I have a budget, but not enogh of one to buy a new eaton. I live in Norther Ok and can drive to get it depending on the distance. thanks Ron __________________ Life is full of choices and a Chevy is the best choice. 1990 Chevy SWB

12-09-2003, 01:39 AM	#3
72superBB Registered User Join Date: Nov 2003 Location: Mandan, ND Posts: 422	Is that for the insides or the whole axle? What do you think it would cost to ship? That is farther that what I was wanting to drive. thanks Ron __________________ Life is full of choices and a Chevy is the best choice. 1990 Chevy SWB

12-09-2003, 03:13 AM	#4
imdarren Registered User Join Date: Oct 2001 Location: SW Washington Posts: 1,006	I can't speak for JQ-72, but I'm sure that for $300 you get the whole rear end. If it was just the carrier / posi unit, you could get a new one from Eaton for not a bunch more. As for shipping . . . . That would kill ya. That would push up the total cost too close to what you could buy a new Eaton posi third member. Darren __________________ Washington State 1967 Chevy C10 LWB Rodstoration In Progress. 1972 K20 Cheyenne Super

12-09-2003, 02:28 PM	#6
72superBB Registered User Join Date: Nov 2003 Location: Mandan, ND Posts: 422	Sure wish I was closer to the two guys in Alabama that have one. I would take either on of them if I could get it here closer. Ron __________________ Life is full of choices and a Chevy is the best choice. 1990 Chevy SWB

12-12-2003, 01:42 PM	#8
kilomanjaro Senior Member Join Date: Mar 2001 Location: From Kansas now in Palmer, Alaska Posts: 807	posi I have a 12 bolt 3:08 POSI rear out of a 72, I am located in manhattan, ks but would drive to meet you half way for my cost of gas. I am asking 275 for it. It is complete drum to drum. Let me know if you would be interested. John kilomanjaro63@hotmail.com __________________ 63 Buick Wildcat 425 72 Chevy Blazer CST 72 Chevy C10 Cheyenne 00 Ford F-350 Super Duty 7.3L 09 Dodge Challenger SRT-8 10 Ford Expedition Limited

12-09-2003, 01:37 AM	#2
JQ-72 Senior Member Join Date: Feb 2001 Location: Killen, Alabama USA Posts: 3,548	I have a 3.08 posi out of a 72 Cheyenne Super. $300 in North Alabama. Joshua

12-09-2003, 11:39 AM	#5
JQ-72 Senior Member Join Date: Feb 2001 Location: Killen, Alabama USA Posts: 3,548	Yeah, 300 for the complete rear end. I would rather not part it out. Joshua

12-11-2003, 06:39 PM	#7
DANTIP Registered User Join Date: Sep 2001 Location: Fort Wayne, Indiana, USA Posts: 1,880	I have a 5-lug coil spring posi rear with new Richmond gears (3:73), new bearings, seals wheel cylinders, and studs. I sold the truck I intended to install it in a year ago, and I am tired of tripping over it in my garage. I live in the Kansas City area and will make a hell of a deal to move it. Please e-mail me if interested. Dan Tippmann dtippmann@aol.com

12-12-2003, 03:19 PM	#9
72superBB Registered User Join Date: Nov 2003 Location: Mandan, ND Posts: 422	What will be better for driving on a highway? THe 3.73 or the 3.08? Not that a 402 bb is the best highway vehicle, but what is the difference that I would notice? thanks __________________ Life is full of choices and a Chevy is the best choice. 1990 Chevy SWB

12-12-2003, 04:20 PM	#10
1971 Cheyenne Registered User Join Date: Nov 2002 Location: Bellevue, WA Posts: 1,480	The 3.08 gears will be MUCH better for highway cruising... __________________ Brian Pal 1971 Cheyenne 10 454/th400-Undergoing a full frame off resto. 1972 Chevy short/step 2wd, 350/th350 1983 M1009 CUCV Military K5 Blazer 1981 Dodge 1 ton 4x4 dually flatbed

12-12-2003, 07:16 PM	#11
72superBB Registered User Join Date: Nov 2003 Location: Mandan, ND Posts: 422	What do you lose at the get go, or off the line I mean, with the different gears? Thanks __________________ Life is full of choices and a Chevy is the best choice. 1990 Chevy SWB

12-12-2003, 08:51 PM	#12
jmanz69 Careful, they attack... Join Date: Aug 2001 Location: Waterford, MI, USA Posts: 1,107	The 3.73 is faster off the line, but the 3.08 will give you better gas mileage. The 3.08 will be more of a dog off the line unless you have a strong BB, then you will be able to pull it ok. Still not as good as the 3.73. Depends on what you want to use the truck for. If you do mostly highway, you should go with the 3.08, if you want to do stoplight races, then go with the 3.73.

12-12-2003, 09:11 PM	#13
1971 Cheyenne Registered User Join Date: Nov 2002 Location: Bellevue, WA Posts: 1,480	my truck has 3.07's, and unless you are doing alot of stoplight/drag racing, I would go for the 3.07's. My truck definately isn't a dog off of the line, but it's not fast either. They will give you much better gas mileage, and better freeway cruising (lower rpms). If you want gears that will get you off the line quick, but will make it less economical and comfortable driving on the freeway... __________________ Brian Pal 1971 Cheyenne 10 454/th400-Undergoing a full frame off resto. 1972 Chevy short/step 2wd, 350/th350 1983 M1009 CUCV Military K5 Blazer 1981 Dodge 1 ton 4x4 dually flatbed

12-13-2003, 10:20 AM	#14
Huck Senior Member Join Date: Jun 2001 Location: Shelbyville, KY Posts: 3,269	Ron, the other thing to consider is trailering and gas mileage. If you plan to do a lot of pulling ----flatbed, boat, or other heavy stuff, the 373 gears will make that a bit easier. Actually the best overall gears I've seen are the 354 gears as they give you a great compromise. I use 308 posi with a 5 speed. I can pull most hills fine but need to go to 4th on the steep long ones or when pulling a heavy trailer. This is with a mild 350. A big block should handle the 308's just fine in almost any application. If you expect to do a bit of highway driving, the 308 will give you max gas mileage potential. I would expect the difference to be at least 2-3 mpg difference on the highway. You might want to check to see what you are running right now gear wise. I would suspect a stock BB to have 307/8s so going to a 373 would give you a easier, faster, more torque start. At 75 though, you will wish for the 308 and vice versa!! No simple solution.



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