Scored a 12 bolt on CL - The 1947 - Present Chevrolet & GMC Truck Message Board Network

pcmcobra · 05-19-2009, 07:24 PM

Saw local Cl ad, dude parting out a 79 gmc.
went and looked, had a 12 bolt, dude wanted $50 if I took it out or $100 if he did,
gave him a cnote and off I went with a 12 bolt.
Not bad...
Now I gotta make time to clean it up, put a new posi/gears and maybe some disk brakes!
woohoo

silvereagle07 · 05-19-2009, 08:30 PM

Congrats on the find pcmcobra. I was just as fortunate a few weeks ago. $50 also from a 79. What new components(posi/gears/brakes) are you looking at. I was looking at rebuilding the one I have.

pcmcobra · 05-19-2009, 09:50 PM

looking at eaton posi with 3.73 gears...not sure about brakes yet.
Need to find out what I want, mcgaughys 13" or another brand. For the $, the mcgaughys is nice, I plan on doing the front also, but not right now, dont have the $ for both.

silvereagle07 · 05-20-2009, 12:36 PM

I was looking at the Detroit TruTrac. I don't know what gear I want yet. The 12 bolt has 3.73 gears in it. I'm going to see how it works first. What did you get the 6.0l out of? Is is still fuel injected? Do you run it with the stock ECM/TCM? Sorry for all the questions, just curious. My TBSS has a 6.0L.

pcmcobra · 05-20-2009, 01:04 PM

Motor came out of 2500 express van, ya I am running FI w/ stock harness and ecm, I did have the harness reworked and the ecm tuned.
Running like a champ!

Driveway Dreams · 05-20-2009, 01:44 PM

Nice find. Where are you guys looking to get gears and posis from? I put a stock 12 bolt in mine and would like to upgrade as well at some point.

My good buddy just picked up a 6.0 and 4L80 for his 66 we are building. I am around that setup everyday at work and it is a great combo. How do you like it in your truck? Tranny stock?

pcmcobra · 05-20-2009, 02:57 PM

ya, the 4l803 tranny I have is stock, w/ stock converter.
Wish I had the $ to upgrade everything at once, but I don't.
I have thought about a new converter, but I really want to get this rearend done first.
The power the 6.0 has is nice, tranny shifts smooth, no problems.
Definitely recommend doing the swap if anyone is thinking about it.

05-19-2009, 07:24 PM	#1
pcmcobra Registered User Join Date: Aug 2006 Location: Florida Posts: 1,684	Scored a 12 bolt on CL Saw local Cl ad, dude parting out a 79 gmc. went and looked, had a 12 bolt, dude wanted $50 if I took it out or $100 if he did, gave him a cnote and off I went with a 12 bolt. Not bad... Now I gotta make time to clean it up, put a new posi/gears and maybe some disk brakes! woohoo __________________ 1986 C10 SWB 6.0/6l90e Miami...Flee it like a native

05-19-2009, 08:30 PM	#2
silvereagle07 Registered User Join Date: Sep 2008 Location: Bailey, NC Posts: 2,462	Re: Scored a 12 bolt on CL Congrats on the find pcmcobra. I was just as fortunate a few weeks ago. $50 also from a 79. What new components(posi/gears/brakes) are you looking at. I was looking at rebuilding the one I have. __________________ Jeramy '84 GMC project truck '85 Chevy 4X4 SOLD '07 Chevy Trailblazer SS 5th Annual SHPHC Car/Truck Show Pics http://67-72chevytrucks.com/vboard/s...d.php?t=543605 UPDATED PICS! CHECK 'EM OUT Last edited by silvereagle07; 05-19-2009 at 08:30 PM.

05-19-2009, 09:50 PM	#3
pcmcobra Registered User Join Date: Aug 2006 Location: Florida Posts: 1,684	Re: Scored a 12 bolt on CL looking at eaton posi with 3.73 gears...not sure about brakes yet. Need to find out what I want, mcgaughys 13" or another brand. For the $, the mcgaughys is nice, I plan on doing the front also, but not right now, dont have the $ for both. __________________ 1986 C10 SWB 6.0/6l90e Miami...Flee it like a native

05-20-2009, 12:36 PM	#4
silvereagle07 Registered User Join Date: Sep 2008 Location: Bailey, NC Posts: 2,462	Re: Scored a 12 bolt on CL I was looking at the Detroit TruTrac. I don't know what gear I want yet. The 12 bolt has 3.73 gears in it. I'm going to see how it works first. What did you get the 6.0l out of? Is is still fuel injected? Do you run it with the stock ECM/TCM? Sorry for all the questions, just curious. My TBSS has a 6.0L. __________________ Jeramy '84 GMC project truck '85 Chevy 4X4 SOLD '07 Chevy Trailblazer SS 5th Annual SHPHC Car/Truck Show Pics http://67-72chevytrucks.com/vboard/s...d.php?t=543605 UPDATED PICS! CHECK 'EM OUT

05-20-2009, 01:04 PM	#5
pcmcobra Registered User Join Date: Aug 2006 Location: Florida Posts: 1,684	Re: Scored a 12 bolt on CL Motor came out of 2500 express van, ya I am running FI w/ stock harness and ecm, I did have the harness reworked and the ecm tuned. Running like a champ! __________________ 1986 C10 SWB 6.0/6l90e Miami...Flee it like a native

05-20-2009, 01:44 PM	#6
Driveway Dreams I have car A.D.D. Join Date: Feb 2009 Location: Greeley, Northern Colorado Posts: 4,147	Re: Scored a 12 bolt on CL Nice find. Where are you guys looking to get gears and posis from? I put a stock 12 bolt in mine and would like to upgrade as well at some point. My good buddy just picked up a 6.0 and 4L80 for his 66 we are building. I am around that setup everyday at work and it is a great combo. How do you like it in your truck? Tranny stock? __________________ -Gerald Building vehicles in memory of the first "car guy" I ever knew, my Grandpa. Bob Dunham 1935-2009. Rest in peace. 61 GMC Suburban SOLD The 86 build thread SOLD Are you a Colorado member?Click here.

05-20-2009, 02:57 PM	#7
pcmcobra Registered User Join Date: Aug 2006 Location: Florida Posts: 1,684	Re: Scored a 12 bolt on CL ya, the 4l803 tranny I have is stock, w/ stock converter. Wish I had the $ to upgrade everything at once, but I don't. I have thought about a new converter, but I really want to get this rearend done first. The power the 6.0 has is nice, tranny shifts smooth, no problems. Definitely recommend doing the swap if anyone is thinking about it. __________________ 1986 C10 SWB 6.0/6l90e Miami...Flee it like a native



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