5.7 6spd Manual Gears

[0RAPOM7]

I have a 5.7 with the 6 speed manual from a 2010 Challenger going into a 1970 Satty this Spring. What rear gear ratio should I get? The car will not be a dragster but a cruiser around town and long trips. But my curiosity will want to gun it once in a while.

Any suggestions?

Thanks

 

[68sportsatelliteragtop]

I assume you are running an 8 3/4 rear. A set of 3.91 would be a good rear ratio for everyday use......

 

[usaroadrunner]

I talked to a few guys with the 6 speed an one of them had a 3:91 an told me that first was almost worthless, he said he was shifting into second immediately. If I remember correctly I thought the challenger came with a 3:06. I'm putting a 6.1 w/ a 6 speed and got a 3:55. Just trying to find the happy medium so you can stomp on it in first and have decent rpm in 6th while cruising. Just the info I came across and passing it along. Good luck with the build it will be a blast to drive.

 

[0RAPOM7]

3:91 was my first choice but not sure if I would like to shift into second rather quickly. I might try the 3:55 gears like you USARoadrunner. Thanks for the feed backs.

 

[5.7 hemi]

What's the first gear ratio on that 6spd.? My 5spd. auto has a 3 to 1 and I run 3.91's with a 28 inch tall tire and it is just fine.

 

[usaroadrunner]

2010 6 speed ratio......

1st...2.97
2nd...2.10
3rd...1.46
4th...1.00
5th....074
6th....050

 

[5.7 hemi]

Ok, so my auto has a steeper first gear and the 6spd has a taller od. At 70 I'm turning 23-2400 rpm. So with that 6spd trans, you should be just hunky dory with a set of 3.91's.

 

[Modern Muscle]

all 6 speed modern Challengers come from the factory with 3.91s Just a FYI

 

[lxmodguy]

all 6 speed modern Challengers come from the factory with 3.91s Just a FYI

Yup.....what Dave just said! They come with 245/45/20's which are 28.7 inches tall

 

[5.7 hemi]

So why not use a set of 3.91's? You can sh!t and git outta the hole and still cruise......what am I missing?

 

[usaroadrunner]

So why not use a set of 3.91's? You can sh!t and git outta the hole and still cruise......what am I missing?

I just passed along info from what people told me. Hell put 4:56 in. I put 3:55 I didn't tell anyone what to go with. Just passing along info to go off by. My bad the 3:06 was in the 5speed auto.

 

[kb67mopar]

I'd probably run 3.55's just to keep the crusing rpm's down a bit but I also plan to do lots of crusing

 

[nstyle73]

The 3.91's with the six speed keep the car under or right at 2000rpm at 70mph in the stock challenger with the stock 245's. That is with a 5.7L. First seems fine to me and not excessively low, but I am used to a pickup transmission also, so that is my comparison. I would not be afraid to go to 4.10's, but as you say you want to cruise, 3.91 or 3.73 may be better for you.

 

[kb67mopar]

My Ram with the 5.7 cruises at 65 mph at 1700 rpm with 34" tires. So if it has the power to push a 6000 lb truck around at speed in double overdrive at 1700 I am not worried about being too low. For me I am shooting for a similar speed at cruising to keep the cash in my wallet on those long cruises. But 3.73 or 3.91 might be ok if you don't mind it spinning a bit at speed.

 

[5.7 hemi]

I just checked my rpm's at 80 and I was doing 24-2500, I'm not complaining.