4.11 true-trac - Page 3 - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

IWANTA(ss) · 02-24-2020, 10:25 PM

Quote:

Originally Posted by Joe M 2012 2SS

I'm sure GPI didn't do anything wrong. The problem is Motive, they used to make high quality gears in Italy, they have been bought out a few years back, and now are made in China.

I had Motive 3.91's put in with my tru-trac by someone with 40 years experience, pattern was perfect, backlash spot on, whined like crazy. Poor machining. Switched to AAM, and after many passes at the drag strip it has developed just a little whine, but no where near what the Motive's did.

I didn't think that either but didn't know that about motive. I'm going to call GPI and see what they think in the morning

IWANTA(ss) · 02-24-2020, 10:32 PM

Quote:

Originally Posted by oldman14ss

WOW! that is noisy! I'm no expert but my opinion is that is way to loud. my ring and pinion is set up a little closer to the toe for competition as shown in the truetrac manual at 5k back lash. its still on my blocks waiting for me to finish. I guarantee if mine are singing they are going back to my installer. now there are 5 cut gears and two cut gears. 5 cut so ive read are harder to set up because of the taper in the gears.

I wish I could just drive the car to them and leave it and let them do the heads while they have it lol. but my plan is to do the 500 miles and change the fluild and see if it goes away when I go over 60 and cruise if not Im going bite the bullet and send the diff back

IWANTA(ss) · 03-06-2020, 03:52 PM

Talked to GPI they said to finish the break in and judge it then. They also said the offset bushings carry a lot of noise along with the lpw cover. And I’m so guessing the Pegasus bushings is accounting for some noise to. But I’m only 150 miles away from the 5 so we will see.

IWANTA(ss) · 03-31-2020, 06:29 PM

Hit the 500 mile mark last week drove the car out of town and it whined Lol but with the solid bushing and etc in the rear I think that is how it’s supposed to sound.

Overall though they work and really well
21.9 mpg turning 1800 rpm at 73 mph in 6th gear with fbo and SS4 cam
The acceleration is very noticeable even coming from the 3.91 the car feels lighter.
But I have no idea what the true trac is supposed to feel like when it’s working can someone give me a little help.

oldman14ss · 04-01-2020, 08:21 PM

yeah I hit 500 and have whine on the coast side of the gears. I have another problem though. my right axle nut came loose and left the planet! don't know how long it was gone. I see no diff leaks. gonna crank it down real tight this time and listen to the bearings.

Black_SS10 · 04-01-2020, 08:47 PM

Quote:

Originally Posted by IWANTA(ss)

Hit the 500 mile mark last week drove the car out of town and it whined Lol but with the solid bushing and etc in the rear I think that is how it’s supposed to sound.

Overall though they work and really well
21.9 mpg turning 1800 rpm at 73 mph in 6th gear with fbo and SS4 cam
The acceleration is very noticeable even coming from the 3.91 the car feels lighter.
But I have no idea what the true trac is supposed to feel like when it’s working can someone give me a little help.

For lack of a better description at the moment. The diff will feel like it is locked. It is going to feel a little different compared to an lsd.

Quote:

Originally Posted by oldman14ss

yeah I hit 500 and have whine on the coast side of the gears. I have another problem though. my right axle nut came loose and left the planet! don't know how long it was gone. I see no diff leaks. gonna crank it down real tight this time and listen to the bearings.

The axle nut is torqued to 199ftlbs.

IWANTA(ss) · 04-02-2020, 06:25 AM

Quote:

Originally Posted by oldman14ss

yeah I hit 500 and have whine on the coast side of the gears. I have another problem though. my right axle nut came loose and left the planet! don't know how long it was gone. I see no diff leaks. gonna crank it down real tight this time and listen to the bearings.

Torque it to spec then stake the nut.

Quote:

Originally Posted by Black_SS10

For lack of a better description at the moment. The diff will feel like it is locked. It is going to feel a little different compared to lsd.

I’m coming from a 02 single cab Chevy what does a locked diff feel like?

Black_SS10 · 04-02-2020, 08:29 AM

Ths Trutrac is a helical diff and operates similar to a clutch based LSD. It can operate as an open diff and apply power equally to both tires. Since it is gear and not clutch based it can feel more mechanical and have a locked feeling when bias is generated.

IWANTA(ss) · 04-03-2020, 08:30 AM

Quote:

Originally Posted by Black_SS10

Ths Trutrac is a helical diff and operates similar to a clutch based LSD. It can operate as an open diff and apply power equally to both tires. Since it is gear and not clutch based it can feel more mechanical and have a locked feeling when bias is generated.

Would you say it feels like the rear squats down under hard acceleration

Black_SS10 · 04-03-2020, 08:34 AM

Quote:

Originally Posted by IWANTA(ss)

Would you say it feels like the rear squats down under hard acceleration

That feeling can happen. You applying equal power to both wheels. No slipping of clutch packs in the diff anymore. It will feel very direct.

oldman14ss · 04-05-2020, 08:09 PM

I have 3:70 aam, trutrak, red poly diff bushing, toe rods and arms with poly. why so whiney? dot get it.

IWANTA(ss) · 04-06-2020, 02:06 PM

Quote:

Originally Posted by oldman14ss

I have 3:70 aam, trutrak, red poly diff bushing, toe rods and arms with poly. why so whiney? dot get it.

I don’t kno 4.11 are a little bigger and I also have the aluminum sub frame bushing and derlin diff bushings with the lpw cover

03-06-2020, 03:52 PM	#31
IWANTA(ss) Drives: 13 1LE 1SS/05 ZX10/02 Silverado/14 Join Date: Nov 2014 Location: Brandon,Mississippi Posts: 487 View My Garage	Talked to GPI they said to finish the break in and judge it then. They also said the offset bushings carry a lot of noise along with the lpw cover. And I’m so guessing the Pegasus bushings is accounting for some noise to. But I’m only 150 miles away from the 5 so we will see. __________________ 02 Stepside Silverado 05 ZX-10 13 1LE 14 Nightrod Special

03-31-2020, 06:29 PM	#32
IWANTA(ss) Drives: 13 1LE 1SS/05 ZX10/02 Silverado/14 Join Date: Nov 2014 Location: Brandon,Mississippi Posts: 487 View My Garage	Hit the 500 mile mark last week drove the car out of town and it whined Lol but with the solid bushing and etc in the rear I think that is how it’s supposed to sound. Overall though they work and really well 21.9 mpg turning 1800 rpm at 73 mph in 6th gear with fbo and SS4 cam The acceleration is very noticeable even coming from the 3.91 the car feels lighter. But I have no idea what the true trac is supposed to feel like when it’s working can someone give me a little help. __________________ 02 Stepside Silverado 05 ZX-10 13 1LE 14 Nightrod Special

04-02-2020, 08:29 AM	#36
Black_SS10 SomeguyK Drives: 2010 Black 2SS/RS Join Date: Nov 2014 Location: FL Posts: 1,947	Ths Trutrac is a helical diff and operates similar to a clutch based LSD. It can operate as an open diff and apply power equally to both tires. Since it is gear and not clutch based it can feel more mechanical and have a locked feeling when bias is generated. __________________ TMS 427, Dart iron Block, Forged assembly, Frankenstien heads, AGP TT 62/62 BB turbo's, AGP/Fore triple fuel system, Tilton clutch, Holley 1 7/8 shorties, Technostalgia tail lights,Oracle, Aeroforce, MGW shifter,Flowmaster, Pegasus subframe bushings,BMR trailing & toe arms,Z28 UCA bushings,Zl1 rear sway bar,Prothane,BMR,Goodridge brake lines,Ridetech HQ coilovers,3.91,Trutrac,billet caps,DSS axles,HE offest,built TR6060,1LE diffuser,Havoc spoiler,SSclones,20in MRR 017, Pirelli P Zero, Nitto NT555RII More to come.

04-01-2020, 08:21 PM	#33
oldman14ss Drives: 2014 1ss camaro Join Date: Jul 2017 Location: missouri Posts: 705	yeah I hit 500 and have whine on the coast side of the gears. I have another problem though. my right axle nut came loose and left the planet! don't know how long it was gone. I see no diff leaks. gonna crank it down real tight this time and listen to the bearings.

04-05-2020, 08:09 PM	#39
oldman14ss Drives: 2014 1ss camaro Join Date: Jul 2017 Location: missouri Posts: 705	I have 3:70 aam, trutrak, red poly diff bushing, toe rods and arms with poly. why so whiney? dot get it.