How much difference did you notice between 390 and 410 gears?
12-04-2011 | 10:35 PM
#41
. It's the stronger of the 4. gears. The ring gear teeth are thicker and don't bust as easily. The size of the pinion diameter changes even if there are the same amount of teeth.
12-04-2011 | 10:39 PM
#42
Go with 4.10s and don't look back. If you have the know-how run the solid spacer instead of the crush sleeve. Gear failures in the rear ends of these cars are 99% of the time due to teeth mis-alignment, and not because of too much horsepower.
If you know how to drive the car like you have a rear made of glass, you should have no problem even pulling decent 60's. My buddies Camaro has pulled a few 1.80 60's with a stock rear besides the 4.10 gears and DD's it on those same DR's. It's more or less about the driver/installation than anything.
If you really think your going to find strength in any gear ratio 10 bolt your kidding yourself.
If you know how to drive the car like you have a rear made of glass, you should have no problem even pulling decent 60's. My buddies Camaro has pulled a few 1.80 60's with a stock rear besides the 4.10 gears and DD's it on those same DR's. It's more or less about the driver/installation than anything.
If you really think your going to find strength in any gear ratio 10 bolt your kidding yourself.
I was thinking maybe it was just in need of adjustment. Anyway the installer doesnt do them anymore I dont think and I dont know if the guy I know that does em now is familiar with that setup or not.
12-04-2011 | 10:42 PM
#43
I'm leaning heavily towards it unless someone can give me good reason not too. I dont plan to run a DR on the 10 bolt with an m6 so I think 1st would be useless like you said, even with the 295's on the rear. I like my first gear its fun haha
12-06-2011 | 12:56 AM
#45
Ok...so if these are richmond gears..
2.73 15-41
3.08 13-40
3.23 13-42
3.42 12-41
3.73 11-41
3.90 11-43 (Motive)
4.10 10-41
4.56 09-41
and motive is...
3.90 11-43
4.10 10-41
I see the 2 4.10's are the same but the whole 390 and # of gear thing still confuses me, if the the sets listed above are correct (I added the motive 390 in there with the richmonds) then isnt the 390 actually smaller then the 373??
2.73 15-41
3.08 13-40
3.23 13-42
3.42 12-41
3.73 11-41
3.90 11-43 (Motive)
4.10 10-41
4.56 09-41
and motive is...
3.90 11-43
4.10 10-41
I see the 2 4.10's are the same but the whole 390 and # of gear thing still confuses me, if the the sets listed above are correct (I added the motive 390 in there with the richmonds) then isnt the 390 actually smaller then the 373??
12-06-2011 | 08:44 AM
#47
TECH Resident
Joined: Feb 2002
Posts: 843
Likes: 0
From: Roseville, Ca.
Unless you're worried about shifting into 5th before the traps go with 411's. I went from 373's and noticed that I wasn't waiting for the power with a cam anymore. I actually get BETTER city mileage and less buck at low speeds. And by the way, 1rst gear IS usable with drag radials.
12-08-2011 | 10:55 PM
#50
Hope not, I remember the first time I went from a 323 to a 373 in one of my first fbodies years back I was disappointed. Wasnt until I went to a 410 that I felt it was a decent gain, I think the 342 ist all that bad but the 390 should be perfect for what I am doing with the car. Should be a bit stronger then the 410 I assume s well?
12-09-2011 | 09:36 AM
#51
I have an M6 car that sees barely any track time. I run 3.55's in my 9". Stock 10 bolt had 3.23's. I dont have traction issues in 1st gear, although if I want them to break loose it isnt a problem. Still have decent acceleration and it gets a lot of speed out of each gear which means I dont have to shift every 1.5 seconds. It seems to be plenty of gear to beat most others on the street around here. If it needs more acceleration then I will add power not gear. Just my 2 cents.
12-09-2011 | 10:10 AM
#52
I have an M6 car that sees barely any track time. I run 3.55's in my 9". Stock 10 bolt had 3.23's. I dont have traction issues in 1st gear, although if I want them to break loose it isnt a problem. Still have decent acceleration and it gets a lot of speed out of each gear which means I dont have to shift every 1.5 seconds. It seems to be plenty of gear to beat most others on the street around here. If it needs more acceleration then I will add power not gear. Just my 2 cents.
12-09-2011 | 04:06 PM
#53
Oh, I forgot, my car was an auto. I swapped in the M6. Sorry for any confusion.
12-09-2011 | 04:58 PM
#54
And yeah 390's should be fine on the street. I swapped the 323's for some 373's in my 10 bolt, then broke the 10 bolt twice, and decided to go with the 9". Wanted a little more top end out of each gear so I decided on the 355's. To each their own though. I'm not going to knock on anyone elses preferences on their car. Build it how you want it. Good luck with the gears.
