Register or Log In To remove these advertisements. |
|
|
|
Thread Tools | Display Modes |
|
08-11-2011, 11:36 AM | #1 |
Registered User
Join Date: Mar 2007
Location: Austin, TX
Posts: 292
|
12 Bolt 3.73 Posi Bundle... Worth a fart?
Having my 12 bolt rear rebuilt and I'm trying to keep costs down while maintaining a respectable level of strength/dependability. I found this on Ebay and I don't know if it's worth purchasing. I've email the seller with questions, but reviews on the products are all positive. Any feedback?
http://cgi.ebay.com/ebaymotors/GM-12...ht_2279wt_1165
__________________
2008 Yamaha Zuma 50cc - Daily Driver 1979 Chevrolet Bonanza SWB; 357ci, TH400, 3.73 Posi - Daily Driver 1976 Chevrolet Sport Van SWB; 355ci, TH350, 2.73 Open - Rape Free 1972 Oldsmobile Cutlass S; 455ci, TH400, 2.73 Open - SOLD (but I still claim to own it from time to time) |
08-11-2011, 11:57 AM | #2 |
1965 Chevy C10, 2005 4.8L/4l60
Join Date: Aug 2004
Location: DFW Texas
Posts: 8,546
|
Re: 12 Bolt 3.73 Posi Bundle... Worth a fart?
I would say see if it's for 3 or 4 series 12bolts,
Looking on another site ( randy's ring and pinion ringpinion.com ), the exact parts would be approx $875.00 plus shipping.
__________________
Clyde65 Rebuild of Clyde http://67-72chevytrucks.com/vboard/s...84#post8338184 69 Aristocrat Lo Liner build http://67-72chevytrucks.com/vboard/s...84#post7561684 support our troops! |
08-11-2011, 12:33 PM | #3 |
Registered User
Join Date: Feb 2010
Location: Asheville, N.C.
Posts: 785
|
Re: 12 Bolt 3.73 Posi Bundle... Worth a fart?
id give it two farts, its an eaton posi, i would find out who makes the ring and pinion before buying though
__________________
|
08-11-2011, 01:03 PM | #4 |
Registered User
Join Date: Mar 2007
Location: Austin, TX
Posts: 292
|
Re: 12 Bolt 3.73 Posi Bundle... Worth a fart?
Am I wrong for thinking that $650 for all of this is a good price?
__________________
2008 Yamaha Zuma 50cc - Daily Driver 1979 Chevrolet Bonanza SWB; 357ci, TH400, 3.73 Posi - Daily Driver 1976 Chevrolet Sport Van SWB; 355ci, TH350, 2.73 Open - Rape Free 1972 Oldsmobile Cutlass S; 455ci, TH400, 2.73 Open - SOLD (but I still claim to own it from time to time) |
08-11-2011, 01:19 PM | #5 |
Registered User
Join Date: Mar 2007
Location: Austin, TX
Posts: 292
|
Re: 12 Bolt 3.73 Posi Bundle... Worth a fart?
I'm getting a little confused while shopping for these GM 12 8.875" components. I need your help...
I currently have a 3.08 ratio which means I have a 3 series carrier... Is this correct? When shopping for rear components, I keep finding posi units for 3.73 and up carriers. Does that mean I will have to purchase a new carrier for my rear to make this work? Forgive me if this is a stupid question.
__________________
2008 Yamaha Zuma 50cc - Daily Driver 1979 Chevrolet Bonanza SWB; 357ci, TH400, 3.73 Posi - Daily Driver 1976 Chevrolet Sport Van SWB; 355ci, TH350, 2.73 Open - Rape Free 1972 Oldsmobile Cutlass S; 455ci, TH400, 2.73 Open - SOLD (but I still claim to own it from time to time) |
08-12-2011, 01:33 AM | #6 | |
Registered User
Join Date: Jun 2004
Location: Spartanburg, SC
Posts: 1,963
|
Re: 12 Bolt 3.73 Posi Bundle... Worth a fart?
Quote:
Richmond gears are good and made right down the street from me....
__________________
Paul '78 GMC Serria 15 Heavy Half. 361/NV3500/3.73. Former LWB NV3500 swap Trailing arm swap '98 ECSB Z71 daily driver -traded '03 burb. Family cruiser http://upstategmtrucks.com/ |
|
08-12-2011, 09:34 AM | #7 |
Registered User
Join Date: Mar 2007
Location: Austin, TX
Posts: 292
|
Re: 12 Bolt 3.73 Posi Bundle... Worth a fart?
Bought it... I'll post plenty of pics when it arrives. I can't wait to have a 700r4 to 3.73 Posi Combo. It's going to awesome!!!
__________________
2008 Yamaha Zuma 50cc - Daily Driver 1979 Chevrolet Bonanza SWB; 357ci, TH400, 3.73 Posi - Daily Driver 1976 Chevrolet Sport Van SWB; 355ci, TH350, 2.73 Open - Rape Free 1972 Oldsmobile Cutlass S; 455ci, TH400, 2.73 Open - SOLD (but I still claim to own it from time to time) |
08-12-2011, 10:14 AM | #8 | |
Registered User
Join Date: Oct 2005
Location: Branchville SC
Posts: 1,647
|
Re: 12 Bolt 3.73 Posi Bundle... Worth a fart?
Quote:
__________________
2004 z71, 96 z71 on 38s, 88 Chevy k5 blazer, 4in lift. 84 swb project, 82 SWB project , 84 chevy 4x4 lwb project, 88 Jimmy beater/highschool ride. 79 c30. 99 tahoe 4x4 project. and a bunch of parts trucks.. |
|
08-11-2011, 01:11 PM | #9 |
Registered User
Join Date: Feb 2010
Location: Asheville, N.C.
Posts: 785
|
Re: 12 Bolt 3.73 Posi Bundle... Worth a fart?
thats not bad at all from what ive seen while shopping for 12 bolt parts
__________________
|
08-11-2011, 02:31 PM | #10 |
1965 Chevy C10, 2005 4.8L/4l60
Join Date: Aug 2004
Location: DFW Texas
Posts: 8,546
|
Re: 12 Bolt 3.73 Posi Bundle... Worth a fart?
Yes, you have a 3 series, you can put up to 3.73's in a 3 series but it has to be specifically for the 3 series, the posi will go in either 3 or 4 series 12bolt.
I agree with find out brand of gear set.
__________________
Clyde65 Rebuild of Clyde http://67-72chevytrucks.com/vboard/s...84#post8338184 69 Aristocrat Lo Liner build http://67-72chevytrucks.com/vboard/s...84#post7561684 support our troops! |
08-11-2011, 04:06 PM | #11 |
Registered User
Join Date: Mar 2007
Location: Austin, TX
Posts: 292
|
Re: 12 Bolt 3.73 Posi Bundle... Worth a fart?
Just got off the phone with the company that sells this bundle. Here is what you get...
So... Summit Pricing... $469.95 - Eaton 12 bolt Truck Posi Unit $165.95 - Richmond EXCEL Ring and Pinion 3.73 + $75.00 - Bearing Kit = $710.64 not including s/h... Or... $650 on ebay w/ no s/h charge. I'm pulling the trigger tonight unless you guys have some compelling feedback about any of these items. If any of these items are cheap, weak, or inherently bad PLEASE LET ME KNOW. Time is of the essence due to my truck sitting at the shop until I supply parts.
__________________
2008 Yamaha Zuma 50cc - Daily Driver 1979 Chevrolet Bonanza SWB; 357ci, TH400, 3.73 Posi - Daily Driver 1976 Chevrolet Sport Van SWB; 355ci, TH350, 2.73 Open - Rape Free 1972 Oldsmobile Cutlass S; 455ci, TH400, 2.73 Open - SOLD (but I still claim to own it from time to time) |
11-23-2011, 09:09 PM | #12 | |
Registered User
Join Date: Apr 2009
Location: New Freedom Pa.
Posts: 1,335
|
Re: 12 Bolt 3.73 Posi Bundle... Worth a fart?
Quote:
Desert |
|
08-11-2011, 03:55 PM | #13 |
Chevys Kick A$$
Join Date: Jan 2005
Location: Zootown, MT
Posts: 12,699
|
Re: 12 Bolt 3.73 Posi Bundle... Worth a fart?
Yep I would figure out what kinda ring and pinion first defiantly before you buy it if you do. That doesn't seem like to bad a setup or price personally.
__________________
*HOODS is what I answer too* -'79, '77, '88 Pickup Sold, '85 Camaro, '83 T/A, '81,'83,'90 K5 Blazer All Sold -'79 3/4 ton "Big Yellow Bananna" Lifted 4spd. 39.5 TSL Swampers, The money Pit -'86 K5 Blazer Silverado 6.2 4" lift 35"s -'95 Ext. Cab Shorty 4" Tuff Country rolling 35" M/T's -'83 Monte Carlo T-Tops. 126,500 Original Miles -LATER I would rather push a Chevy then drive a ford!!
|
08-11-2011, 11:43 PM | #14 |
Registered User
Join Date: Mar 2000
Location: Blue Ridge, Tx
Posts: 1,172
|
Re: 12 Bolt 3.73 Posi Bundle... Worth a fart?
That's not a bad price. I would do it.
Posted via Mobile Device
__________________
Fawker Fab three seater rock crawler buggy 498 BBC/SM465/203/205 doubler, propane, 5.13's, 42" PB Rockers '66 C10 - The new hot rod '77 3+3 Dually - 12 valve 4wd conversion tow rig project '28 Ford 2 door sedan street rod RevLimit Offroad "Hang on beer, we can do this." |
08-11-2011, 11:51 PM | #15 |
US Army Veteran
Join Date: Nov 2008
Location: Central Texas
Posts: 1,049
|
Re: 12 Bolt 3.73 Posi Bundle... Worth a fart?
This is pretty much what I have in my 78. Can't say if it's the same vendor, ordered over two years ago, but I swapped in the same 3.73 unit. So far it's handled a considerable amount of HP/TQ that my 383 stroker has given it.
__________________
1972 C10 Highlander - The making of a daily driver |
08-12-2011, 11:27 PM | #16 |
Parts and more parts
Join Date: Nov 2003
Location: Lebo, Kansas (middle of nowhere
Posts: 6,821
|
Re: 12 Bolt 3.73 Posi Bundle... Worth a fart?
I have been running a 12 bolt posi for years. Changed it to a 3.73 gear ratio about 7 years ago and it was worth the effort.
__________________
Frank |
08-15-2011, 09:57 AM | #17 |
Registered User
Join Date: Mar 2007
Location: Austin, TX
Posts: 292
|
Re: 12 Bolt 3.73 Posi Bundle... Worth a fart?
The bundle is shipping via UPS, and it's ETA is tomorrow afternoon. I'll take plenty of pics and post them here. I'll try to get some pics of the rebuild process as well and share them. Once this is completed, My 700r4 is going in...
__________________
2008 Yamaha Zuma 50cc - Daily Driver 1979 Chevrolet Bonanza SWB; 357ci, TH400, 3.73 Posi - Daily Driver 1976 Chevrolet Sport Van SWB; 355ci, TH350, 2.73 Open - Rape Free 1972 Oldsmobile Cutlass S; 455ci, TH400, 2.73 Open - SOLD (but I still claim to own it from time to time) |
08-16-2011, 09:50 PM | #18 |
Registered User
Join Date: Mar 2007
Location: Austin, TX
Posts: 292
|
Re: 12 Bolt 3.73 Posi Bundle... Worth a fart?
The "Posi Bundle" arrived today!!! Here we go...
Eaton Posi Unit... Richmond 3.73 Ring and Pinion... Master Rebuild Kit... Now I just have to wait for it to be installed. I can't wait to try out the taller gears.
__________________
2008 Yamaha Zuma 50cc - Daily Driver 1979 Chevrolet Bonanza SWB; 357ci, TH400, 3.73 Posi - Daily Driver 1976 Chevrolet Sport Van SWB; 355ci, TH350, 2.73 Open - Rape Free 1972 Oldsmobile Cutlass S; 455ci, TH400, 2.73 Open - SOLD (but I still claim to own it from time to time) |
08-17-2011, 12:03 AM | #19 |
GM Addicted
Join Date: Jan 2009
Location: Visalia, Ca
Posts: 2,294
|
Re: 12 Bolt 3.73 Posi Bundle... Worth a fart?
keep us posted on how well it does have a 700r4 in my truck with a mild 350.. rear end is next project
__________________
..Mac’s Garage.. 73 GMC, 54 Caddy, 2010 Silverado, 68 C10 RIP DAd My 73 GMC Truck Build Pic 2010 Silverado 4/6 on 24s IG:MacsGarage |
08-17-2011, 09:08 AM | #20 |
Registered User
Join Date: Mar 2007
Location: Austin, TX
Posts: 292
|
Re: 12 Bolt 3.73 Posi Bundle... Worth a fart?
Will do... All things considered, I'm not sure if there's anything else I can do to make my truck more fuel efficient. After this is complete I mean... Save for getting a LS motor, which is not in my budget, and probably won't be for some time...
__________________
2008 Yamaha Zuma 50cc - Daily Driver 1979 Chevrolet Bonanza SWB; 357ci, TH400, 3.73 Posi - Daily Driver 1976 Chevrolet Sport Van SWB; 355ci, TH350, 2.73 Open - Rape Free 1972 Oldsmobile Cutlass S; 455ci, TH400, 2.73 Open - SOLD (but I still claim to own it from time to time) |
08-17-2011, 05:35 PM | #21 |
Registered User
Join Date: Jun 2004
Location: Spartanburg, SC
Posts: 1,963
|
Re: 12 Bolt 3.73 Posi Bundle... Worth a fart?
Dont expect alot, my truck only gets about 13.5 mpg.....
I might need to do this as well. Mine is just a peg leg and the guy who set up the gears apparently didnt know what he was doing, even though he came highly recommended. It howls like crazy when you let off the gas, I did use a set of used gears, but took him a new complete master overhaul kit so all the bearings should be new? I took it back twice but he said it was fine....
__________________
Paul '78 GMC Serria 15 Heavy Half. 361/NV3500/3.73. Former LWB NV3500 swap Trailing arm swap '98 ECSB Z71 daily driver -traded '03 burb. Family cruiser http://upstategmtrucks.com/ |
08-17-2011, 08:55 PM | #22 |
Parts and more parts
Join Date: Nov 2003
Location: Lebo, Kansas (middle of nowhere
Posts: 6,821
|
Re: 12 Bolt 3.73 Posi Bundle... Worth a fart?
I get 14.5 to 15 MPG with my 3.73 12 bolt posi setup. I am runnning a 385 stroker engine, with a 700 R4 tranny (Without the lockup converter). I am running a 2400 stall converter with a set of 28.5" tall tires in the rear of the truck. The trick with the setup is to find the gear ratio and tire size that gives you the best RPMs for your highway driving. With my lopey cam and the stall converter, I set mine up to run at 2500 RPMs at 75 MPH. If you have a lockup converter and not running against a stall, then you could shoot for 2000 to 2200 at 70 to 75 MPH. You can do this by changing tire sizes, easily. Just remember the taller the tire, the harder it is to accelerate from a stop. That will eat up the fuel and make you loose mileage.
You can get into a fuel injected LS motor for about $700 dollars, motor and tranny with computer and harness. The expensive comes when you try to do the harness.
__________________
Frank |
08-18-2011, 10:59 AM | #23 |
Registered User
Join Date: Mar 2007
Location: Austin, TX
Posts: 292
|
Re: 12 Bolt 3.73 Posi Bundle... Worth a fart?
This is more like it. I'm running a very mild 357ci w/ dual 2.25" longtube header exhaust, performer intake, Sean Murphy Q-Jet, Open Air Filter, 275/60/15 tires... and with the addition of the 3.73 Posi and 700r4, I expect to do 15mpg or better... High hopes, I know, but I was doing that with my old tranny and rear.
__________________
2008 Yamaha Zuma 50cc - Daily Driver 1979 Chevrolet Bonanza SWB; 357ci, TH400, 3.73 Posi - Daily Driver 1976 Chevrolet Sport Van SWB; 355ci, TH350, 2.73 Open - Rape Free 1972 Oldsmobile Cutlass S; 455ci, TH400, 2.73 Open - SOLD (but I still claim to own it from time to time) |
08-19-2011, 12:00 PM | #24 |
Registered User
Join Date: Mar 2007
Location: Austin, TX
Posts: 292
|
Re: 12 Bolt 3.73 Posi Bundle... Worth a fart?
Stopped by the shop to see the progress... These pics don't show it, but the old ring and pinion had huge pieces of metal missing from the teeth. I will take better pictures once they're in my possession. The Pinion bearing was also shot and had come apart. Pieces of metal that had broken off at some point, had welded themselves to other parts of the ring and pinion. Terrible looking situation inside... Should be getting it out of the shop today. These guys are doing a fantastic job.
__________________
2008 Yamaha Zuma 50cc - Daily Driver 1979 Chevrolet Bonanza SWB; 357ci, TH400, 3.73 Posi - Daily Driver 1976 Chevrolet Sport Van SWB; 355ci, TH350, 2.73 Open - Rape Free 1972 Oldsmobile Cutlass S; 455ci, TH400, 2.73 Open - SOLD (but I still claim to own it from time to time) |
10-18-2011, 07:00 PM | #25 | |
Registered User
Join Date: Jul 2009
Location: Thibodaux, LA
Posts: 479
|
Re: 12 Bolt 3.73 Posi Bundle... Worth a fart?
Quote:
__________________
"Buckle up I wanna try somethin!!" "of course it will hold!, I welded it!" 1977 c10 under knife for full rebuild, 5.3l 4l60e drive rain swap, replacement frame and green repaint |
|
Bookmarks |
Thread Tools | |
Display Modes | |
|
|