Beefing up the rear end - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

RKCamaro13 · 08-19-2014, 09:27 PM

So I'm thinking about getting the Detroit Truetrac diff but I've got a few questions that hopefully someone can answer for me. Just a quick background of what I've done and what I'm planning to do still. Right now my car is cammed with headers and exhaust, about 450rwhp. I planning on adding a Maggie and meth kit, want to be around 675-700rwhp when I'm done. With that in mind should I go with 3.73 gears or 3.45. I don't want get 3.91s beacause that would just be too much. I also have a DSS aluminum driveshaft on the way, that will still bolt right up to the new diff right? I will also be upgrading to DSS 1000hp axels too, I think they should fit too, but just want someone to confirm that for me. Thanks.

jrpxxii · 08-19-2014, 10:04 PM

3.73

SuperchargedStealth · 08-19-2014, 10:51 PM

I ran a TruTrac with the stock 3.45 gears making 811whp, but that was with a centri. At that time and even still, I was using 1000hp axles. I've since upgraded the center section to the Dana60 rear, running 3.73 gears with the same axles. To say the axles will hold up is hard to say, because myself and one other person were using that exact same setup with the rear, and he broke his 1000hp axles running a Maggie. It's hard to say what would be better as far as gears. Although the ZL1 uses 3.73, power to the rear may be slightly different. The 3.45 should be good, to last you for a while. If I had a choice though, I would go 3.73. The Trutrac is a great posi unit so it'll help you grip using both wheels better.

H-E · 08-19-2014, 10:58 PM

Keep the 3.45 gear.

Driveshaftshop · 08-20-2014, 07:44 AM

Yes as long as you don't change from the Stock rear housing (9"/12bolt or Dana60) all will fit correctly.

Quote:

Originally Posted by RKCamaro13

So I'm thinking about getting the Detroit Truetrac diff but I've got a few questions that hopefully someone can answer for me. Just a quick background of what I've done and what I'm planning to do still. Right now my car is cammed with headers and exhaust, about 450rwhp. I planning on adding a Maggie and meth kit, want to be around 675-700rwhp when I'm done. With that in mind should I go with 3.73 gears or 3.45. I don't want get 3.91s beacause that would just be too much. I also have a DSS aluminum driveshaft on the way, that will still bolt right up to the new diff right? I will also be upgrading to DSS 1000hp axels too, I think they should fit too, but just want someone to confirm that for me. Thanks.

RKCamaro13 · 08-20-2014, 08:36 AM

Quote:

Originally Posted by SuperchargedStealth

I ran a TruTrac with the stock 3.45 gears making 811whp, but that was with a centri. At that time and even still, I was using 1000hp axles. I've since upgraded the center section to the Dana60 rear, running 3.73 gears with the same axles. To say the axles will hold up is hard to say, because myself and one other person were using that exact same setup with the rear, and he broke his 1000hp axles running a Maggie. It's hard to say what would be better as far as gears. Although the ZL1 uses 3.73, power to the rear may be slightly different. The 3.45 should be good, to last you for a while. If I had a choice though, I would go 3.73. The Trutrac is a great posi unit so it'll help you grip using both wheels better.

I'm not planning on drag racing or beating on it too often, it's more peace of mind i guess, but thanks for the help

RKCamaro13 · 08-20-2014, 08:37 AM

Quote:

Originally Posted by H-E

Keep the 3.45 gear.

Why wouldn't you recommend 3.73s?

Quote:

Originally Posted by Driveshaftshop

Yes as long as you don't change from the Stock rear housing (9"/12bolt or Dana60) all will fit correctly.

That's what I thought, thanks.

H-E · 08-20-2014, 02:38 PM

Quote:

Originally Posted by RKCamaro13

Why wouldn't you recommend 3.73s?

That's what I thought, thanks.

You wouldn't put gear in a diesel would you? The Maggie likes to pull, that's it's advantage so use it.The more tq you have the less gear you need...

quickdrraw · 10-11-2014, 01:45 AM

Question is what do you want your speed to look like? Imagine going down the track, do you want better 60ft, 1/4 or 1/8 times? Are you going auto cross type quickness?

Synner · 10-11-2014, 02:53 AM

By the time you add up all the axles, posi, gears, labor, etc you might as well just buy the GM ZL1 rear end kit.

376LS3 · 10-11-2014, 09:02 AM

^ Second that. I invested almost $5k into my drivetrain to have it beefed up and my diff was built incorrectly and it obliterated itself. $2700 down the drain just in diff parts. I still run the 1-pc driveshaft and 1000hp axles, but think Im going to sell them since I just ended up buying a brand new 1LE diff. Spend the money once and do it right unless you have a differential shop that you trust 200%. I would just get the ZL1 assembly and call it good. Hindsight is always 20/20.

H-E · 10-11-2014, 10:28 AM

Quote:

Originally Posted by 376LS3

^ Second that. I invested almost $5k into my drivetrain to have it beefed up and my diff was built incorrectly and it obliterated itself. $2700 down the drain just in diff parts. I still run the 1-pc driveshaft and 1000hp axles, but think Im going to sell them since I just ended up buying a brand new 1LE diff. Spend the money once and do it right unless you have a differential shop that you trust 200%. I would just get the ZL1 assembly and call it good. Hindsight is always 20/20.

I would say if you frequent the zl1 section you will see that the zl1 setup diffently has it share of issue's. I do agree on doing it right the first time and would recommend our 9 inch.

Synner · 10-11-2014, 07:02 PM

I would say you always talk down about anything and everything you don't personally sell and profit from.

Bo White · 10-11-2014, 08:52 PM

Run 3.91s and a centri blower. The cam you have now may not be a real good match for a PD blower but more than likely will work fine with a centri.

08-19-2014, 09:27 PM	#1
RKCamaro13 Drives: 2011 Red 2SSRS A6 Join Date: Jan 2011 Location: Louisiana Posts: 693	Beefing up the rear end So I'm thinking about getting the Detroit Truetrac diff but I've got a few questions that hopefully someone can answer for me. Just a quick background of what I've done and what I'm planning to do still. Right now my car is cammed with headers and exhaust, about 450rwhp. I planning on adding a Maggie and meth kit, want to be around 675-700rwhp when I'm done. With that in mind should I go with 3.73 gears or 3.45. I don't want get 3.91s beacause that would just be too much. I also have a DSS aluminum driveshaft on the way, that will still bolt right up to the new diff right? I will also be upgrading to DSS 1000hp axels too, I think they should fit too, but just want someone to confirm that for me. Thanks. __________________ MPD1 Z Force hood, 1LE splitter, ZL1 rockers and diffuser, Heritage grille, Sparks Restorations emblems, Magnuson Supercharger, ID850 Injectors, Alky Methanol Kit, Livernois Fuel Pump Roto-Fab CAI, SW long tube headers, CNC ported throttle body, High flow cats, Lethal Racing Prowler Cam, LS3 conversion, Yank 3400 Stall, Corsa 3" cat back exhaust, RX Catch Can, BMR Suspension, BC Coilovers, Slotted and Cross-drilled rotors, Custom Interior.

08-19-2014, 10:04 PM	#2
jrpxxii Drives: 2010 Camaro SS/RS 427ci Join Date: Jul 2009 Location: Bowling Green, Ky Posts: 3,355	3.73 __________________

08-19-2014, 10:51 PM	#3
SuperchargedStealth Drives: '11 Camaro Supercharged Convertible Join Date: May 2014 Location: NJ Posts: 481	I ran a TruTrac with the stock 3.45 gears making 811whp, but that was with a centri. At that time and even still, I was using 1000hp axles. I've since upgraded the center section to the Dana60 rear, running 3.73 gears with the same axles. To say the axles will hold up is hard to say, because myself and one other person were using that exact same setup with the rear, and he broke his 1000hp axles running a Maggie. It's hard to say what would be better as far as gears. Although the ZL1 uses 3.73, power to the rear may be slightly different. The 3.45 should be good, to last you for a while. If I had a choice though, I would go 3.73. The Trutrac is a great posi unit so it'll help you grip using both wheels better. __________________ 2011 Triple Black SS convertible, LSX 427, PRC 260cc heads, Callies Ultra Billet Rods, Wiseco -20 cc piston, Callies Dragon Slayer crank, Strange Dana 60 rear w/3.73 gear ratio and driveshaft, Pfadt coilovers, Pfadt sway bars, Pfadt trailing arms, Pfadt tie rods, Pfadt subframe bushings, Vortech YSi with wastegate and twin BOV, Haltech ECU, Mantic 9000 Twin Clutch, ALKY control meth system with dual nozzle, Squash twin fuel pumps, ACS T3 ports, VIS Terminator Hood, Seibon ZL style lip.

10-11-2014, 09:02 AM	#11
376LS3 Eh, that'll happen Drives: 2010 2SS Join Date: Apr 2012 Location: Mesa, Arizona Posts: 1,841	^ Second that. I invested almost $5k into my drivetrain to have it beefed up and my diff was built incorrectly and it obliterated itself. $2700 down the drain just in diff parts. I still run the 1-pc driveshaft and 1000hp axles, but think Im going to sell them since I just ended up buying a brand new 1LE diff. Spend the money once and do it right unless you have a differential shop that you trust 200%. I would just get the ZL1 assembly and call it good. Hindsight is always 20/20. __________________ 2010 Camaro SS LS3 - No Modz

10-11-2014, 08:52 PM	#14
Bo White Drives: 2015 Summit White 2SS 1LE Join Date: Feb 2012 Location: Vance Alabama Posts: 8,018	Run 3.91s and a centri blower. The cam you have now may not be a real good match for a PD blower but more than likely will work fine with a centri. __________________ Retired wanna be cylinder head porter 2015 2SS 1LE Clutch reservoir, Vararam DRX, ported TB, TSP 2" headers, MGW shifter Totalled: 2010 1SS Wilkes Performance/Eagle 416 shortblock, TSP custom valvetrain, PRC 260 heads, Edelbrock Pro Flo 102, th400 swap, 8" PTC 5500 stall= 535/435 at the wheels tuned Gen 3 Performance and Dyno 10.97 @ 124 full weight in 3100 DA CamaroFest X

08-19-2014, 10:58 PM	#4
H-E Account Suspended Drives: 2010 zr1 Camaro 2011 vert Join Date: Apr 2013 Location: everywhere Posts: 1,121	Keep the 3.45 gear.

10-11-2014, 01:45 AM	#9
quickdrraw Drives: 2015 Z/28 Join Date: Nov 2012 Location: Oregon Posts: 213 View My Garage	Question is what do you want your speed to look like? Imagine going down the track, do you want better 60ft, 1/4 or 1/8 times? Are you going auto cross type quickness?

10-11-2014, 02:53 AM	#10
Synner Drives: cars Join Date: May 2011 Location: Oversneeze Posts: 4,544	By the time you add up all the axles, posi, gears, labor, etc you might as well just buy the GM ZL1 rear end kit.

10-11-2014, 07:02 PM	#13
Synner Drives: cars Join Date: May 2011 Location: Oversneeze Posts: 4,544	I would say you always talk down about anything and everything you don't personally sell and profit from.