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Old 05-06-2010, 10:05 PM   #15
Roger Ramjet
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Use this Excel file to find RPM and speed.
Attached Files
File Type: zip RPM MPH.zip (4.2 KB, 332 views)
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Old 05-06-2010, 10:09 PM   #16
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I'm doing 3.45 gears for A6 and 4.10 for M6. The A6 doesn't need much help with the very deep 4.03 1st gear.
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Old 12-07-2010, 05:21 PM   #17
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Anyone have new thoughts/experiences to share?

I'm planning future mods. I may not want to go too crazy as far as power goes, so I feel that 3.73 gears on my L99 will make my additions go that much farther
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Old 12-07-2010, 06:10 PM   #18
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Quote:
Originally Posted by MG View Post



Anyone have new thoughts/experiences to share?

I'm planning future mods. I may not want to go too crazy as far as power goes, so I feel that 3.73 gears on my L99 will make my additions go that much farther
The 3.73s are great in the L99 cars. By upgrading the factory 3.27s in the stock A6 equipped Camaro SS to the Richmond 3.73s you will realize an equivalent torque gain of approximately 15% or 61.5 rear wheel lb.-ft. of torque. As far as bang for your buck goes, there isn't much that can touch a rear end gear swap.
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Old 12-07-2010, 06:39 PM   #19
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Originally Posted by Apex Chase View Post
The 3.73s are great in the L99 cars. By upgrading the factory 3.27s in the stock A6 equipped Camaro SS to the Richmond 3.73s you will realize an equivalent torque gain of approximately 15% or 61.5 rear wheel lb.-ft. of torque. As far as bang for your buck goes, there isn't much that can touch a rear end gear swap.



Any drawbacks?

Obviously there will be a slight decrease in mileage when cruising, but I was reading about some folks getting whine (why would that be?)

Would I need supporting mods for the driveline if I'm pushing, say, 440-500 RWHP?
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Old 12-07-2010, 08:05 PM   #20
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Any drawbacks?

Obviously there will be a slight decrease in mileage when cruising, but I was reading about some folks getting whine (why would that be?)

Would I need supporting mods for the driveline if I'm pushing, say, 440-500 RWHP?
Not really. You may lose 1-2 MPG but that is about it. Gear whine is nonexistent for the most part but the installation can have an impact on that.

You may want some suspension mods but you shouldn't need any driveline mods for a street application. If you hit the strip a lot and use drag radials or slicks you might want to beef things up.
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Old 03-18-2011, 12:51 AM   #21
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It's going to feel like you went up from 3.27 to 3.73 no matter what. Who cares what the ratio is in the end. If you have 20s when you start, and 20s when you install them, you will feel the difference in yourass gauge. Thats the one that matters.
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Old 03-18-2011, 11:31 AM   #22
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You know I got half way down the page till I realized this is from about a year ago.
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Old 03-18-2011, 12:49 PM   #23
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I just picked up my L99 after having a JRE complete diff. swapped in with 3.73 gears. Impressions with only 130 miles on the new rear end. I also got new trailing arms and upgraded the diff bushings and trailing arm bushings.

- Pulls noticably harder off the line
- Pulls harder after each shift point
- If I want to I can boil them off in first gear but if I pay attention, I can launch very hard and have no problem at all.
- Slight gear whine at 40-45 mph range. Nothing really noticable at cruise speeds.
- Cruise RPMs at 80 mph are around 2300 rpms compared to around 2000 for the factory gears.
- Average 20.1 mpg so far all around driving. compared to 21.5 mpg average before. (Only 130 miles on rear end so far though so not enough to really know accurately)
- Rear end extremely stable under hard launch and burn outs (used to have alot of vibration under rear end when launching hard and burn outs, now just a rock solid feel and when you burn them off, just a quick jerk at first and then it feels like you slipped out of gear, nothing at all, until you look back and see the white smoke rolling out from the rear end!!)
- Slightly more road noise in town driving, not much at all but some. None at cruise speeds.

Happy so far. Will be much happier when the maggie gets bolted on. Then I will likely just launch out of 2nd gear!!!
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Old 11-15-2011, 10:10 PM   #24
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Rear end gears can whine if they are not set up properly with the proper preload and such. Some people with higher numeric gears than stock have no change in gas mileage from stock because the engine doesn't have to work as hard to get the car up to speed.

It would be a good idea to get some DSS axles especially if you run your car at the strip or have drag radials. Definitely get trailing arms, toe rods, and cradle and differential bushings to eliminate wheel hop too.


Any drawbacks?

Obviously there will be a slight decrease in mileage when cruising, but I was reading about some folks getting whine (why would that be?)

Would I need supporting mods for the driveline if I'm pushing, say, 440-500 RWHP?[/QUOTE]
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Old 11-16-2011, 02:04 PM   #25
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I have a brand new set of Richmond 4.33's with the full install kit still in original packaging that I'll sell very reasonable. Bought them and then decided against installing them. Car is a 650 hp lingenfelter S/C job and I think the gear will just be too much with that power. Cost about $800.00 new, sell for $500 and I'll ship to you.
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Old 07-24-2014, 03:14 AM   #26
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You're confusing wheel diameter with TIRE diameter. My 1962 Chevy II had 15" wheels...with 14x32.5" slicks.
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Last edited by Snidely Whiplash; 08-11-2014 at 12:18 PM.
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Old 07-24-2014, 01:04 PM   #27
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Holy necromancy Batman....
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Old 08-11-2014, 12:16 PM   #28
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Quote:
Originally Posted by jo0oker View Post
If I install 3.73 gears on my stock 20" wheels is it really 3.73 gear because as what I heard from my friend for example in 2000 camaro LS1 if I have 16" or 17" wheels on the car it's become real 3.73 gears

But if I have 18" or 20" or 22" wheels 3.73 gears become 3.4 something or 3.5 something

Is it real?

Because if it’s real I will buy 4.10

Sorry for my poor language.
Wheel diameter has nothing to do with final drive ratio. Tires can vary 4 inches or so in height, making TIRE DIAMETER the number to use in calculating RPM at a given speed.
Here's a link to an RPM calculator:
http://www.csgnetwork.com/multirpmcalc.html
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