motive gear r&p - but what gears?
05-19-2011, 01:13 AM
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motive gear r&p - but what gears? a few months ago a buddy of mine sold his trans am, and a week ago he gave me a set of gears he had purchased. A few days ago I was looking at them and saw the box said G875410. At first I thought it was the G875410, but after I looked at it I now think its something with 4:11's. I'm not sure and I want to double check. The ring has 10 bolt holes, 37 teeth, the pinion has 9 teeth. the pinion also has "9x37 GM 7.5-410 7385 G" etched in it. the top of pinion has "3424" & "2,280" etched in it. The ring has "3424" & "BL 0006/8" etched in it.
anyone have any idea?
anyone have any idea?
Last edited by ultra z dot com; 05-19-2011 at 01:22 AM.
05-19-2011, 01:22 AM
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Dude its right there in the part number: G8=(Performance Orange box Motives) 75=(7.5, size of the rear end, ring gear specifically), 410=(4.10 ratio).
They don't make a 4.11 for our widdle 10 bolt.
They don't make a 4.11 for our widdle 10 bolt.
05-19-2011, 01:28 AM
#5
its definitely a Motive 4.11. if you look at the ring gear closer there should be a machine etched "G875410" "G"- GM, "8"- 8620 material(street gears), "75" 7.5" dia ring gear, "410" 4.10/4.11 gear ratio.. 37 divided by 9 is 4.111111...
the BL 006/008 is the backlash setting recommended by the manufacturer
the BL 006/008 is the backlash setting recommended by the manufacturer
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05-19-2011, 06:51 AM
#12
They are 4.10s for sure, but I do believe they are the lower-end (street) gear, not the higher end (performance street) gear that the box part number is.
If there is not a G875410 on the ring gear and pinion, then you have the street gear (supposed to be a blue box).... The performance gear ALWAYS has the part number on the gears themselves... I just installed a set of G875373 gears and the numbers were on the gears themselves.
Now, that is not to say that they are any less of a gear, just that they are *more likely* to make noise than the performance gears. Now, I have also heard the opposite that the performance gears are more likely to make noise.
All in all, I truely believe 95% of the "noise" issues to be install related or worst-case a bad housing, more-so than the gears themselves. I am sure there are bad sets of gears that end up making noise, but I think more times than not it is shoddy installation work.
Having just done a 10-bolt install from scratch (and I mean even without knowing the proper pinion shim to start with, all new parts throughout as well), I can say that it requires you to be meticulous and **** retentive about checking, double checking and triple checking things in more than one place to say it is proper. I can say with certainty that it requires a precision hand in making sure it is dead-on. Close enough will probably make noise, and I am sure the majority of the "brute force" mechanics don't even come close to that.
Hell, even with all the tools available at dealerships, they usually do them by feel, not by measure and they even have the proper tools to take the measurements easier than anything you can buy aftermarket to do it (referring to checking pinion depth here). I am more than convinced that is why there are so many noisy installs, installer error.
Any time someone makes a blanket statement like "oh yeah, those gears always make noise" means that the installer screwed up and refuses to make it right, or is flat out incompetent and doesn't know how to do it right in the first place. There are exceptions, such as Richmonds, but they even state they are expected to be noisier than stock due to thier design.
Most performance gears end up stating that as a disclaimer as well, but in reality the well-known and used brands (outside of Richmonds) are known to be quiet if installed properly.
If there is not a G875410 on the ring gear and pinion, then you have the street gear (supposed to be a blue box).... The performance gear ALWAYS has the part number on the gears themselves... I just installed a set of G875373 gears and the numbers were on the gears themselves.
Now, that is not to say that they are any less of a gear, just that they are *more likely* to make noise than the performance gears. Now, I have also heard the opposite that the performance gears are more likely to make noise.
All in all, I truely believe 95% of the "noise" issues to be install related or worst-case a bad housing, more-so than the gears themselves. I am sure there are bad sets of gears that end up making noise, but I think more times than not it is shoddy installation work.
Having just done a 10-bolt install from scratch (and I mean even without knowing the proper pinion shim to start with, all new parts throughout as well), I can say that it requires you to be meticulous and **** retentive about checking, double checking and triple checking things in more than one place to say it is proper. I can say with certainty that it requires a precision hand in making sure it is dead-on. Close enough will probably make noise, and I am sure the majority of the "brute force" mechanics don't even come close to that.
Hell, even with all the tools available at dealerships, they usually do them by feel, not by measure and they even have the proper tools to take the measurements easier than anything you can buy aftermarket to do it (referring to checking pinion depth here). I am more than convinced that is why there are so many noisy installs, installer error.
Any time someone makes a blanket statement like "oh yeah, those gears always make noise" means that the installer screwed up and refuses to make it right, or is flat out incompetent and doesn't know how to do it right in the first place. There are exceptions, such as Richmonds, but they even state they are expected to be noisier than stock due to thier design.
Most performance gears end up stating that as a disclaimer as well, but in reality the well-known and used brands (outside of Richmonds) are known to be quiet if installed properly.
05-19-2011, 07:18 AM
#13
One thing, are you sure they are even Motive gears???
I did not see a 37-9 tooth gearset listed by Motive. I would call them to verify they are thier gears. If not, be sure to find out whose gears they really are because different manufacturers have different setup specifications.
I did not see a 37-9 tooth gearset listed by Motive. I would call them to verify they are thier gears. If not, be sure to find out whose gears they really are because different manufacturers have different setup specifications.
05-20-2011, 07:43 PM
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One thing, are you sure they are even Motive gears???
I did not see a 37-9 tooth gearset listed by Motive. I would call them to verify they are thier gears. If not, be sure to find out whose gears they really are because different manufacturers have different setup specifications.
I did not see a 37-9 tooth gearset listed by Motive. I would call them to verify they are thier gears. If not, be sure to find out whose gears they really are because different manufacturers have different setup specifications.
