LSD? What ya think?

[Dutch]

Originally Posted by HIGH_HEMI

Anyone know the best combo for launch and cruise? Is that 3.55 or 3.73 range?

I would pick something that would put me close to 3,000 RPMs at 75 MPH. Without doing the math, that'd probably fall in between 4.10 and 3.73, and almost certainly more than 3.55. Even a 3.23 would make a big difference from the Charger's 2.82.

[HIGH_HEMI]

Originally Posted by Dutch

I would pick something that would put me close to 3,000 RPMs at 75 MPH. Without doing the math, that'd probably fall in between 4.10 and 3.73, and almost certainly more than 3.55. Even a 3.23 would make a big difference from the Charger's 2.82.

I had in my mind the 4.10 rear, but the mpg would make that a tough decision for daily driving. Easily switching for driving or racing would be optimum, but I am thinking the happy medium for street races when the call arises and decent mpg for the regular driving aspect. It will be interesting to see how DCX approaches this issue. I think it makes more difference to the market than they may think.

[Big Country]

Putting the 6spd manual in it will be the best of both worlds. Giving you the ability to have the grunt for down low, and the overdrive gear (6th) up high. Chevy has done it for years with the Corvette and the new GTO, and even Dodge with the Viper.

[Mr.DJ]

Originally Posted by Big Country

Putting the 6spd manual in it will be the best of both worlds. Giving you the ability to have the grunt for down low, and the overdrive gear (6th) up high. Chevy has done it for years with the Corvette and the new GTO, and even Dodge with the Viper.

Yep, that's about all 5th and 6th gears are actually meant to be...as a fuel saving 'overdrive'. I haven't owned a vehicle with a 'granny gear' since my 'four on the floor' 1976 Dodge 'Ramcharger'...now, that was another fun vehicle.

[MoparG]

Dutch says:

"I would pick something that would put me close to 3,000 RPMs at 75 MPH. Without doing the math, that'd probably fall in between 4.10 and 3.73, and almost certainly more than 3.55. Even a 3.23 would make a big difference from the Charger's 2.82."





It's interesting that you mention "75 MPH" because that's the magic number to run at to test to see what gear ratio you have on your tachometer assuming you are in a 1:1 gear such as 3rd in 4spd automatic overdrive car or 4th in most 6spd manual overdrive cars.

Hence if you want to cruise at 3000 rpm at 75 MPH in non-overdrive, the 3.00 would be the gear; when you shove it into O/D you'll be cruising at less RPM. If you want to cruise 3000 RPM at 75 MPH in overdrive, then the 4.10 is your gear as I predict that the 4.10s in non-overdrive at 75 MPH will make you rev at 4100rpm. Automatics may vary by about 1000 RPM in tach representations as there may be some parasitic power losses.

In regards to the Charger/300 2.82 gear, don't forget that the first planetary gear in the LX platform 's transmission is quite low(steep) numerically high so it's really not that bad. In fact, it is better to have less gear in the axle and more gear in the trans as this can save driveshaft U-joints from long-term wear.

Too bad there's no point talking about those MB axles as they are not LSD. Only Quaiffe has made an LSD unit for the LX car. There is one guy running around in a magnesium 300C SRT8 that claims he has something called Direct Spindle" (a LSD); a custom set up from the local dealer but he may be just full of words, however, I don't remember seeing Magnesium available in the 300C SRT8 order guide you who knows what he has.

[chasb]

If so, has to be 3:73. Can;t imagine they would go with anything higher. They are better off handling the gearing in the tranny

I ran 3:91 posi and 4:10 posi on my 69 and 72 340's

[WhiteDiamond]

I am hoping they use the rear end the Jeep GC SRT8 uses. It is the MB unit and it has some gear in it!! The non-GC SRT8s have a highway gear that I am sure somebody will try to see if they can swap it out someday....

I want my Challenger SRT8 with the 6.4L, a 6 speed and the GC SRT8 rear end....Thank you Dodge.

Todd

[V Point]

Chrysler calls it a 'Sure Grip'. GM is 'Posi' or 'Positraction'. Hope this helps.