3.90s with M6
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TECH Senior Member
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Joined: Sep 2008
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From: 6,000+ feet
3.90s with M6 Anyone ran this? I have a sound in the rear pretty sure I broke a set of gears. If that's the case I'm gonna go with 3.90s, should be a little stronger than the 4.10's better mileage, better traction etc.
Thoughts?
Thoughts?
I ran 3.90's in my 9" a year ago. They were great on the road but for some weird reason they got burned up at the track. I blamed it on synthetic oil cause nothing else really made any sense.
When I replaced them, I put in 4.11's and now I am kind of regretting it. 1st gear is always busting loose even under good raod conditions and obviously the MPG's went down some amount.
I will say this. When the tires do hook up or if I have the stickies on, the 4.11's do feel noticeably stronger. Might just be my imagination and the fact that I go through the RPMs faster.
At some point in time, I will probably go back to the 3.90's.
When I replaced them, I put in 4.11's and now I am kind of regretting it. 1st gear is always busting loose even under good raod conditions and obviously the MPG's went down some amount.
I will say this. When the tires do hook up or if I have the stickies on, the 4.11's do feel noticeably stronger. Might just be my imagination and the fact that I go through the RPMs faster.
At some point in time, I will probably go back to the 3.90's.
Depending on what you use the car for is how you should decide. If you want the best 1/4mi performance then run a gear that will complement your power peak. If primarily for the street then run whatever gear makes you feel most comfortable.
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Thread Starter
TECH Senior Member
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Joined: Sep 2008
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From: 6,000+ feet
YWell I don't know where power peaks but I do feel that the slightly taller gear will make better use of the powerband of the cam. It has gobs of tq and loves to break the tires loose, tons of mid range and a shift point of only 6200. I feel the 3.90s will make better use of the power it makes.
That and I think the 3.90s will be a Tad stronger than the 4.10s
One thing I didn't mention is I already had 4.10s so I'll be comparing the new gears to that, not stock.
That and I think the 3.90s will be a Tad stronger than the 4.10s
One thing I didn't mention is I already had 4.10s so I'll be comparing the new gears to that, not stock.
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Launching!
Joined: Nov 2007
Posts: 203
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From: Eastern, CT
4.71s here and a 28" tire... best thing ever for my combo. I'm making over 400 rwtq at 2800 rpm, and i felt 4.11s were too long. Gotta remember the OP is at 6000 ft as well, he needs to gear his car accordingly