What the crossfires, especially the autos, REALLY need is some steeper gears. I believe the stocks are 3.07. Somthing around 3.55 or 3.73 would be perfect.. Since They run high 14 second 1/4 miles, and the 215 hp gets it up to over 150 mph... its definately highway geared.

Anyone think rear end gears will become avaliable any time soon? I'm willing to bet they'd take off a good .3 to .4 seconds from the 1/4 mile ET

 

i doubt it. what gears does the SLK run? any options available for that car? do autos and six speeds have different rear gears?

if you wanted a drag car, you bought the wrong one

 

The rear end on the Crossfire auto is a 3.27... I beleive the Stick is also 3.27.

Mo

 

I did see a website where some company was offering rear-end swaps for Mercedes.
Of course I can't find it again!!! I thought I had put it in my favorites! Guess not!

Anyway, they didn't have one listed specifically for the SLK320, but they did have a general price range of several thousand dollars!
(Because the gears in MB diffs are hand fitted matched gear sets)

I'll keep looking to see if I can re-find that site...
Matt

 

your not going nuts - I saw it to but did not book mark it.


-marc

 

I was reading spec's on the SRT6, it has a different rear end. Perhaps a simple parts order / swap can take place there. Or you could always find a wrecked SLK32 and pull it from there.

 

Crossfire comes with 3.25:1 Axle Ratio, except the SRT-6, which is 3.07:1.
http://www.chrysler.com
"A numerically lower axle ratio results in lower engine rpm and better fuel economy. A numerically higher ratio improves acceleration, climbing grades, carrying loads or pulling a trailer."

2003 SLK320 Roadster (essentially our car) 3.27:1.
2003 SLK32AMG Roadster (essentially SRT-6) 3.07:1.
2005 CLK320 Coupe (same 3.2L engine) comes with 3.27:1.
2005 CLK320 Cabriolet (same 3.2L engine, same "TouchShift" 5 speed auto) comes with 3.45:1 rear.
2005 SLK350 Roadster will supposedly have 3.27:1.

 

Try 18' rear wheels and 225/40/ tires in rear and you could feel the change.M.B. guys use to put high 3s rearends in the 400v-8s and it would feel like a 500v-8 !probably $1500-2k.

 

I was wondering, if I put 18s all around instead of the 18/19 combo, would it affect the speedo reading or anything?

 

Check this site for differential swaps and other performance kits for SLK

http://www.bergwerks.com