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04-09-2012, 06:14 PM
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#1 |
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Registered User
Join Date: Apr 2008
Location: Plano, TX
Posts: 49
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12 bolt rearend
Looking at upgrading my 12 bolt rearend (1972 C/10). Looking at getting the Trutrac with 3.42 gears, also thinking about upgrading to rear disc brakes as well. Currently have 3.08 gears with drum brakes. Any ideas on the brakes, and thoughts/feedback on the gears and Trutrac.
Thanks |
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04-09-2012, 08:15 PM
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#2 | |
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Registered User
 
Join Date: Apr 2010
Location: Hagerstown, MD
Posts: 246
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Re: 12 bolt rearend
Quote:
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John Paap Ole Greenie Hagerstown, MD My Mistress 70 CST Short/Step LS 5.3/4L65E New motor install Thread:http://67-72chevytrucks.com/vboard/s...d.php?t=667773 |
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04-09-2012, 08:53 PM
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#3 |
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Its a Truck Thing......
Join Date: Dec 2004
Location: Sierra Vista, Arizona
Posts: 3,179
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Re: 12 bolt rearend
Just put in 3.42 in my 12 bolt, also did the camaro calipers, works well so far.
http://67-72chevytrucks.com/vboard/s...d.php?t=518599 Smitty
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71 C10 283/3SPD Full Resto 71 GMC 1500 Sierra Grande http://67-72chevytrucks.com/vboard/s...d.php?t=518599 70 C10 Suburban Former military GSA truck. 72 Chevy Blazer 4X4, Sloppy Jo, Mountain Climber. Wife says no more trucks. http://67-72chevytrucks.com/vboard/s...d.php?t=707378 72 GMC 1 Ton Motor Home, wife said no more trucks until she saw this one. Gen 3 6.0/4L80E 4.10 http://67-72chevytrucks.com/vboard/s...d.php?t=761110 68 GMC Suburban was 3/4 ton, now 1/2.Wife shook her head 71 C30 Wrecker 71 C20 Scott-Bilt As weird as it gets..BB Cheyenne AC Truck 68 GMC Long Stepside. They keep following me home 69 C30 Former Motor Home, Flat Bed time 70 G20 Red-E-Kamp Conversion "I'm your Boogy Van" |
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04-09-2012, 08:56 PM
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#4 | |
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Registered User
Join Date: Oct 2010
Location: Largo Florida
Posts: 632
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Re: 12 bolt rearend
Quote:
http://www.summitracing.com/search/B...c&autoview=SKU
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Lifes journey is not to arrive at the gate well preserved, it is to slide in sideways all used up and wore out yelling.....God what'a ride! Where patience fails, force prevails Stapp's Ironical Paradox "The universal aptitude for ineptitude makes any human accomplishment an incredible miracle." |
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04-09-2012, 09:32 PM
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#5 |
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motor exploder
Join Date: Mar 2009
Location: Pittsburgh, PA
Posts: 2,346
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Re: 12 bolt rearend
I have a Truetrac, 3.73's, Moser axles and Moser diff cover/brace in my 12 bolt also. Camaro calipers/Impala SS drilled & slotted rotors. I haven't driven it yet with the Truetrac, but when I was doing my shopping, everything I heard and read about the Truetrac was in line with what I needed. Try doing some searching on Team Chevelle (www.chevelles.com), a lot of those guys run the Truetrac in their car 12 bolts.
I will say that I have run the Auburn HP Series LSD in another truck I had and it performed well also. And what good would a post be without pics??? 
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Adam 1969 Chevy CST/10 stepside, DART Big M/TREMEC Magnum Extreme/3.73's w/Detroit Truetrac 1965 Chevy Bel Air Wagon (daily driver), 327/TH350,10 bolt w/3.08's 1961 Chevy Bel Air Sport Coupe, ZZ454/M21/9" rear w/3.50's & Detroit Truetrac 2005 GMC 1500 ccsb 2wd, 6.0L/4L65e/3.73 G80 2006 GMC 2500HD ccsb 4x4, DMax LBZ/Allison 6spd/4.56's w/Detroit TrueTrac   Use the SEARCH function on this forum - it is your friend!! |
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04-09-2012, 09:36 PM
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#6 | |
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70+ ( Old Skool Club )
Join Date: Nov 2003
Location: Saskatoon, Saskatchewan ,Canada
Posts: 9,139
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Re: 12 bolt rearend
Quote:
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1972 C10 Custom/Deluxe 613 Highlander 406/700R4 1999 White Tahoe LS 4x2 with Z56 Police Package 1992 K1500 GMC Suburban Members I have personally met: MusicMan70 - HeavyD - ChewyChevy67 - StingRay -71SWB4x4 - 67 Burb - DeadheadNM - too much stuff - bc65 - das601 " Circumsatances Do Not Change Responsibility " " The Sky is not the Limit, Your Mind is." Marilyn Monroe .. RIP Charlie Watts 1941 - 2021 |
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04-09-2012, 09:41 PM
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#7 |
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70+ ( Old Skool Club )
Join Date: Nov 2003
Location: Saskatoon, Saskatchewan ,Canada
Posts: 9,139
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Re: 12 bolt rearend
I've read and researched tons of stuff on diffs and I agree, a 4L60E or 700R4 with a 3:42 gear with Tru-Trac is a great combo for all around use.
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1972 C10 Custom/Deluxe 613 Highlander 406/700R4 1999 White Tahoe LS 4x2 with Z56 Police Package 1992 K1500 GMC Suburban Members I have personally met: MusicMan70 - HeavyD - ChewyChevy67 - StingRay -71SWB4x4 - 67 Burb - DeadheadNM - too much stuff - bc65 - das601 " Circumsatances Do Not Change Responsibility " " The Sky is not the Limit, Your Mind is." Marilyn Monroe .. RIP Charlie Watts 1941 - 2021 |
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04-09-2012, 10:01 PM
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#8 |
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motor exploder
Join Date: Mar 2009
Location: Pittsburgh, PA
Posts: 2,346
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Re: 12 bolt rearend
The two allen head studs on each side of the 'Moser' logo in the pic above go all the way into the gear case and adjust up against the bearing caps on each side of the differential. They are supposed to stabilize the caps and keep them from 'walking' or moving around under load.
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Adam 1969 Chevy CST/10 stepside, DART Big M/TREMEC Magnum Extreme/3.73's w/Detroit Truetrac 1965 Chevy Bel Air Wagon (daily driver), 327/TH350,10 bolt w/3.08's 1961 Chevy Bel Air Sport Coupe, ZZ454/M21/9" rear w/3.50's & Detroit Truetrac 2005 GMC 1500 ccsb 2wd, 6.0L/4L65e/3.73 G80 2006 GMC 2500HD ccsb 4x4, DMax LBZ/Allison 6spd/4.56's w/Detroit TrueTrac Use the SEARCH function on this forum - it is your friend!! |
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04-10-2012, 02:07 PM
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#9 |
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Registered User
Join Date: Mar 2011
Location: Fort St John, BC
Posts: 85
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Re: 12 bolt rearend
This is a copy of an email from the guy i bought my posi from.
"Jason- We ship to Canada daily. Here is what we can do for you: $450 - GM 12-Bolt Truck Eaton Posi Unit - 30 Spline $135 - GM 12-Bolt Truck Ring & Pinion (3.73 Ratio) $65 - GM 12-Bolt Truck Master Bearing/Installation Kit ------------------------------------------------------------------------------------- $100 - SHIPPING via UPS Worldwide Standard (3-5 Days) ------------------------------------------------------------------------------------- $750 - TOTAL You would have a flat $10 brokerage fee and the taxes would run $20-$30. Let me know if you have any other questions. Thanks, BRYDON 641-751-8060 staticz2229@gmail.com" I think shipping to the US was free. Great product for a great price. I found his stuff on ebay.
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69 c10 lwb |
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04-11-2012, 02:36 AM
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#10 |
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Registered User
Join Date: Jan 2006
Location: Cherry Valley,Ca
Posts: 468
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Re: 12 bolt rearend
Tru-trac is a nice traction device for the street but if Im not mistaken its only offered in 12-bolt truck in the 3.73-up carrier. If you want 3.42 gears you gonna have to use a clutch or cone type. Too bad, I wanted a tru-trac but 3.73s are too tall for my th400 and 28" tires
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04-11-2012, 05:54 PM
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#11 |
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Registered User
Join Date: Apr 2008
Location: Plano, TX
Posts: 49
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Re: 12 bolt rearend
Well that sucks, I came across Moser's website, and they offer the 3.42 gear set/trutrac for their 12 bolt. Since theirs is a custom rearend explains why they are probably able to offer it.
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04-11-2012, 09:23 PM
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#12 |
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Registered User
Join Date: Apr 2007
Location: dequincy la.
Posts: 1,465
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Re: 12 bolt rearend
Just had Moser build this one....true trac....3.73.....33 spline.....Grand sport brakes...kore 3 brackets....
Here's link to board member's kit for truck c5 kit.....I bought one ...but then changed to big ford bearing rear...sold mine...nice kit..... http://67-72chevytrucks.com/vboard/s...d.php?t=415021 here's pic of kit also...........jim
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Build thread at http://67-72chevytrucks.com/vboard/s...d.php?t=475791 |
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