When I first starting thinking of doing gears in my car, I wanted to go with 4.10s. But now that one of my buddy has them, they just seem too much for me. He got on it and man...he was shifting early! I just dont want to sacrifice my power gears so quick! I drive my car on the street, but from time to time I take it to the track. Ive only had the car there a couple of times, but I just dont want too much gear for my car. So therefore I was thinking of going with 3.73s. Theyre an upgrade from the 3.42s, but just under the 4.10s. I dont want to make my car to be fully raced out, but I want to go with something different since Im going to be replacing them anyway. Ive also heard that the 3.73s are a little stronger than the 4.10s and will most commonly make less noise. I plan to do the entire job, ring and pinion, bearings, seals, gaskets, girdle, stud kit, etc. So would I see any gains whatsoever? Thanks and any help is much appreciated!

 

I just added a set of Superior 3.73's last week. This is how the car should have came from the factory! So far there has been no down side to them, I like them alot. You do not have to row the gears as much as 4.10's. 6th gear may not "pull" like it does with 4.10's but there is a noticeable improvement, and it will now actually accelerate for you if you give it gas in 6th at 60mph. I have not "launched" the car hard yet, as I still have another 100 miles of break-in before I start to beat on them, but I don't think traction loss will be much of an issue.

I decided on the 3.73's primarily for strength over the 4.10's. I figured that it would at least give me a little improvement, and hopefully survive until I can afford to drop $2-3k on a real rear with 4.10's. But after driving around this past week on 3.73's, I'm not sure if I want 4.10's now, these feel just right.

You won't notice much change the first as you baby that new rear out of the shop, but give it a couple of days before you start pushing it a little harder and you will notice the difference.

 

i made no gain going to 3.73's in my m6. but,i added a 12bolt with it(A 12BOLT WILL COST SOME HP).a friend of mine added 3.73's (m6) and gained 1.3tenths(not bad).his 60's went from 2.2 to 1.91. at 80mph with my 3.73's i'm on 2,000 rpm's,i'm going to switch to the 4.10's. goodluck.

 

So I will or will not gain from going from a 3.42 to a 3.73 in a 10 bolt? Im not too sure on what you were referring to. Thanks.

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by OneQuickSS:
<strong> So I will or will not gain from going from a 3.42 to a 3.73 in a 10 bolt? Im not too sure on what you were referring to. Thanks. </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">It is not as dramatic of a difference, like the 4.10's are. It basically just makes the car feel like it should have from the factory. The feeling is like picking up about 20lbs/ft of torque, and it just seems to smooth out the shifting process and make the car more comfortable to drive.

If you are looking for e.t. gains the 4.10's will likely give you more, provided that you can get traction. But in a stock 10 bolt this also comes at a price, that 7.5" 4.10 pinion is an awfully small gear. Remember that you are applying about 3700lbs of car on to this... be nice to it or it won't be nice to you <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" /> .

Mike c's 12 bolt (lack of efficiency due to it's larger parts) is robbing what little gains that 3.73's can provide. But if he switches to a 4.10 gear the pinion in his rear is much larger and can take the abuse that our rears can't. His rear will last, there's really no down side to tighter gears for him. Unless you are putting down tons of HP and TQ and you need a larger gear to help with traction and/or getting through the traps at a lower RPM there would be no reason to not go with at least a 4.10 in a 12 bolt or 9".

Hope this makes sense.

 

nice job blackhawk.i think he's got it now.

 

Is it true that a 3.73 is stronger than a 4.10? If so, how? Do you think its even worth going from a 3.42 to a 3.73 even though Im replacing the gears anyway? I have to replace it all, the bearings, the ring and pinion, etc. so I guess it wouldnt hurt any! I just think that with a 4.10, that I wont be satisfied because I will be sacrificing my power gears (1st-3rd) too quickly. I am installing a 224/.581/112 cam in it soon and that will allow me to wrap it out a bit more, but I still dont want that to be an excuse for putting in a 4.10. I just dont think that a 4.10 is very streetable, what do you think. Thanks

 

3.73's have thicker gear teeth than 4.10's since there's more of them on a 4.10 ring than a 3.73 ratio.