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Holy freaking whino

 
Old 09-15-2012, 09:58 PM
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Thumbs down Holy freaking whino

Had my 3.73 installed along with the new setup. After I got the car the gears did make a little tiny noise on decel at 55mph but nothing bad. Been driving the car for 4k miles and its been fine.
BUT, a few nights ago at the track the car did a couple low 11 second passes. Now the gears are whining at low speeds and even higher speeds than before. Some of the sounds at low speed are pretty funky. How much longer would you say this thing will live? lol
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Old 09-15-2012, 10:48 PM
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What kind of gears? Did the rear get a complete bearing refresh?
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Old 09-16-2012, 01:56 AM
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My Motives do it now too. After about a year of hard driving they whine pretty bad. Especially on decel at highway speeds. Mine got a complete bearing rebuild too. They were set up a little tight but I have had them in for 30k miles now and yeah they whine but the rear is still holding up. IDK for how long though.
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Old 09-16-2012, 07:06 AM
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these rears really dont like abuse. its a gamble every time you sink money into them.


its probably best you have them looked at ASAP before a complete implosion occurs.
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Old 09-16-2012, 08:51 AM
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Originally Posted by 01ssreda4 View Post
What kind of gears? Did the rear get a complete bearing refresh?
Well they are motive but I read theres 2 different kinds? IDK with one they are. The #s descibing the gears are mgr-g875373. They were installed with a new 7.5 install kit but thats all I know.
I changed the fluid after around 1k miles or so. Fluid looked good. Old oil was valvoline 80w-90 and new fluid I put in was lucas 85w-140.


Originally Posted by 85CamaroZ28 View Post
My Motives do it now too. After about a year of hard driving they whine pretty bad. Especially on decel at highway speeds. Mine got a complete bearing rebuild too. They were set up a little tight but I have had them in for 30k miles now and yeah they whine but the rear is still holding up. IDK for how long though.

OK good, thanks for the info. Maybe it will last me a while.


Originally Posted by ULTIMATEORANGESS View Post
these rears really dont like abuse. its a gamble every time you sink money into them.


its probably best you have them looked at ASAP before a complete implosion occurs.
Maybe....
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Old 09-16-2012, 09:18 AM
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You got the orange box Motives. I had the same in my 10 bolt. Loudest set of gears Ive ever been responsible for installing. Blue box Motives are typically dead stock silent.
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Old 09-16-2012, 10:00 AM
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Originally Posted by 01ssreda4 View Post
You got the orange box Motives. I had the same in my 10 bolt. Loudest set of gears Ive ever been responsible for installing. Blue box Motives are typically dead stock silent.
Alright thanks. I tried looking on summit racing and search but couldnt figure out what color was which. Does this mean the orange is not as strong as the blue?

Last edited by senicalj4579; 09-16-2012 at 10:31 AM. Reason: Comp issues and didnt see you wrote blue! LOL
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Old 09-16-2012, 10:41 AM
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No quite the opposite the orange motives are made of a tougher alloy which consequently makes the more prone to noise. These maybe noisy but then again you may have broken the blue ones if you had them lol. I want to do 3.90's in my rear but they only come in the orange box so I'm a little skeptical of them being noisy
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Old 09-16-2012, 10:44 AM
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Originally Posted by redbird555 View Post
No quite the opposite the orange motives are made of a tougher alloy which consequently makes the more prone to noise. These maybe noisy but then again you may have broken the blue ones if you had them lol. I want to do 3.90's in my rear but they only come in the orange box so I'm a little skeptical of them being noisy
Thanks. They can make all the noise they want if they are really stronger and hold up.
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Old 09-18-2012, 05:41 PM
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Agreed the orange boxed ones are the loudest pieces of dog crap I have ever heard. No other gear I have used has been anything like these. I will NEVER install another set of motive gears. EVER!
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Old 09-19-2012, 11:28 PM
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I put some in my 12 bolt and they are a little loud too. I won't be buying the orange boxes again.
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Old 09-20-2012, 09:47 PM
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You going to crack it open Joe? Mine has gotten to where it really whines, might be time to go nine inch or your an auto so if you got a good deal on a 12-bolt do that too. I'm doing my nine inch by piecing it together piece by piece to do it on the cheap.
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Old 09-21-2012, 12:50 AM
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Try a different lube(Go back to the lighter 85/90w),3.73 Yukons with Red line shock proof gear lube very little wine, Lucas tends to foam at high stress-rpm..
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Old 09-21-2012, 06:28 AM
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Originally Posted by My6speedZ View Post
You going to crack it open Joe? Mine has gotten to where it really whines, might be time to go nine inch or your an auto so if you got a good deal on a 12-bolt do that too. I'm doing my nine inch by piecing it together piece by piece to do it on the cheap.
IDK ha I just might let it go. I dont think I should waste any time stressing it. I will just have a new rear in mind when it goes.


Originally Posted by Anthony Williams View Post
Try a different lube(Go back to the lighter 85/90w),3.73 Yukons with Red line shock proof gear lube very little wine, Lucas tends to foam at high stress-rpm..
I ws thinking of going back to lighter fluid. The shop used valvoline 80w90 when they did the 3.73.
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Old 09-21-2012, 09:33 AM
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Yeah I hear that, after mine started to whine I decided I wasn't even going to bother trying to make it quite and re-build it or anything like that.

Haha the list of things we want/need never ends smh.
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Old 10-11-2012, 12:48 PM
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Sorry to bring this one back up how can i tell im getting the blue box motive gears? Where can i order some for a 2 series carrier?
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Old 10-11-2012, 07:46 PM
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Originally Posted by reeperz28 View Post
Sorry to bring this one back up how can i tell im getting the blue box motive gears? Where can i order some for a 2 series carrier?
check with some sponsors.
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Old 10-12-2012, 05:07 PM
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I'll add to this for anyone who may search in the future.

I just had motive performance 4.10s put in with a solid pinion spacer and a mac girdle was already installed. Even with that 3 1/8th mile passes and a best 60' of 1.9 they are whinning again, but were nearly silent before the track.
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Old 10-12-2012, 11:32 PM
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Blue box = Part number starts with GMxxxxx etc
Orange box = Part number starts with G8xxxxxx etc.

Typically GM or G8 then rear size then gear ratio. So a 373 for our car in blue box would be GM75373 (7.5 being the size of the ring gear). If you want a 2 series add an X to the end for a thick cut gear.

So a blue box 373 in a 2 series would be GM75373x
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Old 10-13-2012, 06:17 AM
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OP, same thing happened to me with my 9". Gears silent for 2K miles, go to the track, make 4 passes and they scream bloody murder on decel on the way home. Gears were ultimately destroyed.

I blamed it on the 80/90 RP synthetic gear oil I ran and found other instances on the web were others believed this burned them too. I also blame back to back runs down the track which likely heat the gears up more than anything else on the car.

I had orange Motive gears too. I think you were also running too thick oil for race conditions.

Did you run synthetic gear oil?
Did you make back to back runs?
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