mcmuscle3

iTrader: (10)

3.73 vs 4.10

I do mostly dd but I do plan to make trips to the track this year in my 00 formula m6. I am afraid with 4.10s 1st gear will go through too fast and mess up the 60ft time. Has anyone experienced this? also is a gear swap something I can do in my garage or is this a lengthy job?

HCI2000SS

iTrader: (2)

What mods do you have, and what mods will you do in the future?

mcmuscle3

iTrader: (10)

as of now car is all stock. I plan LT, x pipe, dual 2.5" catless exhaust, SLP lid, and gears.. Then later in the future HCI..

BoricuaHec01

I personally would keep the 3.73's especially with those future mods unless you upgrade to a 12 bolt or 9" rearend.

z-maro

iTrader: (18)

Why not add 3.90's to the list? Those who have them seem to like them from what I have read.

mcmuscle3

iTrader: (10)

well Im not sure how much abuse the 10 bolts can handle. My mechanic messes with some ls1 quite a bit and he says they are stronger than ppl let on. But that is the weak link.

Does anyone car to post a link for some 3.73s for sale for me? I looked on ebay but im not sure im finding the correct gears. Also do I need to replace the bearings and such while im in there or no?

HCI2000SS

iTrader: (2)

With mods in sig I wouldn't want any less than my 4.10's to be honest. On the 100 shot it's a different story though lol.

mcmuscle3

iTrader: (10)

I feel like I will run through 1st gear way to fast for my liking. I never owned anything geared down but thats just the way my mind is thinking. haha

HCI2000SS

iTrader: (2)

I hear ya, but remember we have a pretty long 1st gear in our cars. Have you ever rode in a HCI LS1 with 3.73's or 4.10's?

mcmuscle3

iTrader: (10)

This is the first ls1 I have ever rode in. lol

HCI2000SS

iTrader: (2)

Gotcha!

mcmuscle3

iTrader: (10)

I may pick up this. Is new bearings and such a necessity?
http://www.ebay.com/itm/GM-7-5-7-6-10-Bolt-Richmond-Excel-3-73-Ratio-Ring-and-Pinion-Gear-Set-GM75373OE-/271427992984?pt=Motors_Car_Truck_Parts_Accessories&hash=item3f325e7d98&vxp=mtr

LS1W66

I had Motive 3.90's in my Bird and they worked pretty well.
Advantage is their a little stronger then 4.10's in the factory 10 bolt because of the larger pinion gear and that was why I went that route.
But if you want to do it once and forget about it then a 9" is what I would do.

mcmuscle3

iTrader: (10)

Which ones? the 3.90s or 3.73s? I need whichever will be stronger longer.lol

td1168

iTrader: (2)

IMO 3.90's are the way to go. They probably aren't ideal for the mods you have right now but as you start performing different modifications they will start to become a better fit for your car. If you haven't set up a ring and pinion before it's not a good idea to do it without somebody who knows what they are doing. You need a small hydraulic shop press and some other tools to do it the right way. If your contact pattern and backlash aren't right you'll get some noise from the gears and if they're way off you'll ruin them. As far as bearings, they are pretty reliable. Just check them for pitting or scoring.

mcmuscle3

iTrader: (10)

Thanks, I'm pretty handy on Doin my own stuff but you are right I will have my mechanic do it. We are good friends and anything I need done he lets me use his shop and helps me

Fry_

This may help you decide what gears you want.
T56 Gear ratio calculator

I'd go with 4.10 gears. You'll be going 42mph at 6000rpm in 1st gear, I wouldn't exactly call that running through 1st to fast. Plus you'll still only be turning 2000rpm at 75mph in 6th, or 3000rpm at 110mph.

Z Fury

iTrader: (1)

I'll add a +1 to the 3.90 gears. I had them in my old '94 Z28 and they were awesome. It was an auto trans though, so not a great comparison to the M6. That said, I'd drop 3.90s in my '99 Z28 (M6) tomorrow if I felt like modding it up like my old '94.

mcmuscle3

iTrader: (10)

Thanks for the input. After some more reading and thought 3.90s may just be perfect for me.

mcmuscle3

iTrader: (10)

How long does it take to do gears?