Johns98Z28

I did a search, and came up with a couple of previous results. But, I would like to ask the question again....I ordered a set of "genuine gm motive 4.10's and they came in a motive performance gears box with a part # on the box of G875410. Is this a set of genuine gm gears, or a set of motive performance gears. The reason I'm asking is because I paid more for the genuine gm's and want to make sure I got what I paid for.

Thanks for any replies and/or help
John.

WJ SOM SS

iTrader: (11)

Hi John. This happened to me, also. What I believe, is that all these other gear manufacturers, at one time or another, have made gears for General Motors. Therefore they feel that that they can use the term "genuine GM gears". I feel that GM has a certain set of specifications for the gears they put in General Motors Parts packaging. Sometimes these gears could be heat treated differently, etc. Usually, Genuine GM gears that are purchased thru a GM parts dealer cost more than if you purchase your "GM type" gears purchased from someone else & not in GM parts packaging--such as your Motive's. I say, if you want to be assured you are getting "genuine GM parts", then purchase them from a genuine GM parts dealer. I do not believe that GM manufactures their own gears, though. However, GM's specs may be what makes their gears better. Maybe someone else with more knowledge will comment on this. I believe many people out there are getting screwed when purchasing F-body ring & pinion gears---some of them out there are not actually up to GM specs. Anyone else care to comment on this? WJ. <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />

BlackHawk

iTrader: (2)

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Johns98Z28:
<strong>I did a search, and came up with a couple of previous results. But, I would like to ask the question again....I ordered a set of "genuine gm motive 4.10's and they came in a motive performance gears box with a part # on the box of G875410. Is this a set of genuine gm gears, or a set of motive performance gears. The reason I'm asking is because I paid more for the genuine gm's and want to make sure I got what I paid for.

Thanks for any replies and/or help
John.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Okay, this is going to get a little confusing, but I will try to expain this the best that I can.

You did not purchase real Genuine GM gears you purchased Motive Genuine GM Gears... there is a difference. There are actually 3 different ring and pinion sets that are advertised as "Genuine GM." Motive advertises one, Superior another, but the only place you can get real Genuine GM gears is GM itself. The other companies claim that they are "Genuine GM" because they are supposed to be manufactured within GM's tolerances... but of course this is not the same. From what I have heard GM has been sueing these companies over this for years, but nothing has ever changed. True Genuine GM gears are supposed to be the quietest and one of the strongest sets that you can buy, but they come with a very large price tag that most people are not willing to pay for... remember they are still 7.5 gears and can stll be obliterated in no time regardless <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" /> .

Here's the good news for you John, if you are worried about paying $20 more for the Motive Genuine GM's over their regular gears it would have cost alot more for real GM's. The GM part number for the real GM gears is #26016309, the GM list price... or price that the parts counter at your local dealership will quote you is $578.11 (yes, just ring and pinion! <img border="0" title="" alt="[Eek!]" src="gr_eek2.gif" /> ) their wholesale price is $433.58, but you can get them at a discount from places like GMPartsDirect.com for $329.52 <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" /> . I'm sure that is still a far cry from what you paid for.

FYI, you can tell the difference between real GM gears and the others just by looking at the ring and pinion. Only real GM gears have "GM" and a part number stamped into the steel. The other company's gears are stamped GM with ink/paint on the gear.

Hope this helps.
<img border="0" alt="[Firebird]" title="" src="graemlins/formula.gif" />

<small>[ July 21, 2002, 02:22 PM: Message edited by: BlackHawk ]</small>

Johns98Z28

Thanks for the input guys. And hey BlackHawk, that wasn't confusing at all, thanks. I looked at my ring and pinion, and they both are stamped into the steel GM 7.5 9/37, and the ring has 2506 stamped into it, and the pinion has 2507 stamped into it. And I'm definitely not complaining about the price. $274.95 for the ring/pinion, and the master installation kit. You can hardly beat that with a stick!! <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />

BlackHawk

iTrader: (2)

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Johns98Z28:
<strong>Thanks for the input guys. And hey BlackHawk, that wasn't confusing at all, thanks. I looked at my ring and pinion, and they both are stamped into the steel GM 7.5 9/37, and the ring has 2506 stamped into it, and the pinion has 2507 stamped into it. And I'm definitely not complaining about the price. $274.95 for the ring/pinion, and the master installation kit. You can hardly beat that with a stick!! <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" /> </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Your ring and pinion is stamped into the steel <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" /> .

Hmmmm... The part number that is on the box is definately a Motive Gear part number, not the GM. Type in just the number on your box on a search engine like "google.com" and you will see what I am talking about.

Maybe I'm wrong about the stamping vs. inking thing... maybe they changed something :dunno: . Unless someone swapped in a set of real GM's into your box I have serious doubts about your gears being GM's.

But I'm not saying that Motives are bad, many people like them and have had great sucess with them. Someone would have to be crazy to spend $500 at a dealer for GM gears that will still come apart quickly with abuse in a stock rear... that's 1/4 the price of a 12 bolt or 9", just for the ring and pinion alone. I really don't think that there really is enough difference in strength between any of the stock gear sizes to make much of a difference, they are all still limited by size.

Johns98Z28

Hey thanks for the input WJ. I know what you're saying about the tolerances of "genuine gm" gears. And that sounds very logical. I paid $20 more for the " " genuine gm gears from motive. So I know it's not that big of a difference. But I was just curious. Not that any of these sponsors on here would try to pull anything over on us, that's definitely not what I'm suggesting. Again, I was just curious if there was a visual difference in the two sets (genuine gm vs. motive performance), and of course a strength factor difference as well.

Fireball

iTrader: (21)

the motive GM gears are packaged in the motive gear box. Look at the gears them selves there should be a GM stamp on the ring gear

WJ SOM SS

iTrader: (11)

Does anyone know, in fact, who is manufacturing the gears for General Motors? I assume they have vendors supplying these ring & pinions, no? WJ. <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />

Speartech

iTrader: (14)

I can't help on the 4.10's, but I did just buy a set of genuine GM 3.73's for my 91 LS1 Z28 and they are stamped: GM-14092111 - 11:41 - 7 5/8. I think that's the kind of GM part number he was talking about.