201fireman Posted February 22, 2013 Share Posted February 22, 2013 Mildly built 355, T350 trans, 12 bolt rear end. Currently has 2:73 open and I am looking at a posi carrier and 3:55s. Any opinions on what beand/type of carrier to get and if the gears are a good fit? Quote Link to comment Share on other sites More sharing options...
CKZ03 Posted February 22, 2013 Share Posted February 22, 2013 I running the same engine, trans, & 12 bolt as you. I purchased an Eaton Tru-Trac locking rear with 3.55. Could not tell you how it performs as Im still building the car. The 3.55 seemed like a good gear for how I intend on driving it. The Eaton Tru-Trac was suggested to me by my local rear end specialist and was quite affordable. You should call them, their prices blow away most internet deals & they can get you anything you want & Im sure they will ship -Advantage Driveline, Jackson Michigan (517) 768-8940. Quote Link to comment Share on other sites More sharing options...
gprimm Posted February 23, 2013 Share Posted February 23, 2013 Tru Trac. Based on the opinion of a former Eaton employee who was a national sales rep. When I asked about the Eaton GM posi, the Auburn, etc. he said the Tru Trac. He runs that in his 1971 CHevelle SEMA car that was in the all the magazines (Super Chevy, Car Craft, Hot Rod) about 7 years ago. Quote Link to comment Share on other sites More sharing options...
dbreese Posted February 23, 2013 Share Posted February 23, 2013 Tru-Trac x3. I have one in a moser 12 bolt with 33 spline axles and 3.73 gears. Works great on the street and at the track. David Quote Link to comment Share on other sites More sharing options...
CKZ03 Posted February 23, 2013 Share Posted February 23, 2013 Seemed kind of interesting to me, I didnt get to see the inner workings first hand but I was told there are no clutches & springs & stuff like a normal limited slip. It has some kind of worm gear set up that locks up & has no slip (mechanical engagement) once engaged. Truly a full locking rear, to an extent, but maybe some others here know or have experience with these in their own cars & could give a real life review. Im certainly not a rear end expert, just what I was told about what is installed in my car. Quote Link to comment Share on other sites More sharing options...
First Knight Posted February 23, 2013 Share Posted February 23, 2013 Look at these. May help. http://www.summitracing.com/search/depar.../detroit-locker Quote Link to comment Share on other sites More sharing options...
LostnFound Posted February 23, 2013 Share Posted February 23, 2013 Cory...you've updated your signature pic. Your rearend is looking fine! Quote Link to comment Share on other sites More sharing options...
gjmike72 Posted February 23, 2013 Share Posted February 23, 2013 I'm running a detroit locker with a 3.42 gear. The locker does it's job and is bullet proof. I'm also running a SBC and believe a 3.36 might be more highway friendly. With that said I am planning a 200R-4 upgrade with my current gear ratio that should make the car highway friendly. BTW, when the locker engages it's like running a spool...both tires hook/spin at the same speed. Quote Link to comment Share on other sites More sharing options...
LostnFound Posted February 23, 2013 Share Posted February 23, 2013 I've been told Auburn make a good posi....is that correct? Quote Link to comment Share on other sites More sharing options...
gprimm Posted February 24, 2013 Share Posted February 24, 2013 Auburn, not the best. The "cones" are the weak point I have been told by a couple of employees. Better than no posi, but not the best, especially the prices being within each other. Quote Link to comment Share on other sites More sharing options...
Sam (Bones) Posted February 24, 2013 Share Posted February 24, 2013 I have a Auburn, no issues, I rather have the Eaton Quote Link to comment Share on other sites More sharing options...
201fireman Posted February 24, 2013 Author Share Posted February 24, 2013 Thanks for the help guys! One more for you, I am assuming my 12 bolt is an 8.875 series 3. Is this correct and would I have 30 or 33 spline? Thanks again! Quote Link to comment Share on other sites More sharing options...
dbreese Posted February 24, 2013 Share Posted February 24, 2013 Stock 12 bolt axle is a 30 spline. There are two ring and pinion's for 8.875 12 bolt. One for a car and truck. Car has a 1.625 pinion shaft size and a truck has a 1.438. David Quote Link to comment Share on other sites More sharing options...
John Burns Posted February 28, 2013 Share Posted February 28, 2013 Tru-Trac X4! I am not kind to mine and it has held up for years. Quote Link to comment Share on other sites More sharing options...
201fireman Posted March 3, 2013 Author Share Posted March 3, 2013 Thanks for the input guys. Does the one listed in the following link the one you are talking about? Also do the gears in the other link look like the correct ones and is there an install kit of any kind I would need? Posi - http://www.summitracing.com/parts/dtl-913a555/overview/ gears - http://www.summitracing.com/parts/rmg-12bc355/overview/ Quote Link to comment Share on other sites More sharing options...
dbreese Posted March 3, 2013 Share Posted March 3, 2013 Thanks for the input guys. Does the one listed in the following link the one you are talking about? Also do the gears in the other link look like the correct ones and is there an install kit of any kind I would need? Posi - http://www.summitracing.com/parts/dtl-913a555/overview/ gears - http://www.summitracing.com/parts/rmg-12bc355/overview/ Yes and yes. Here is the install kit http://www.summitracing.com/parts/rat-315k I would pass on the paper gasket for the housing cover and use RTV black. You won't be disappointed in the tru-trac. Oopps saw where this kit doesn't have the axle bearings and seals. Might as well change those will doing the build. Good luck on the build! David Quote Link to comment Share on other sites More sharing options...
72MC Posted March 3, 2013 Share Posted March 3, 2013 Nothing wrong with a paper gasket!!! Best way to use them is,... coat the gasket with a thin film of RTV black on both sides and allow to dry, install, torque to spec, and you're goooooooooooood to go,.... for a long time. JMTC - Dave Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.