Does anyone who has spent the money on a modified or serviced transmission know if it would be worthwhile to look into an MR's 6-Speed and Transfer Case/LSD instead?

Would this setup require us to have ACD on our cars?

I realize that this might be an unreasonably expensive modification and I most likely won't ever go through it myself. I only ask because I am curious and would love the opportunity to have TRE (www.teamrip.com) modify a 6-Speed and give me a slightly taller 6th gear for highway driving.

 

One thing to think about is the six speed isnt as good ini a straight line race as the 5 is. So if you drag your car then I wouldnt consider it.

 

this might seem lame, but i haven't drag raced my evo. in fact, i have babied it since i've bought it.

i think i would use the 6-speed for cruising and enjoy keeping it in the powerband throughout the twisties.. there are lots of them where i live

 

Maybe a stupid question but im askin it anyways: could you swap out the drivetrain on the MR with the drivetrain on a 03 GSR? Tranny, tcase, diffs

 

I think its a tough one, but if Al Friedman running his stock tranny is any testimony, the 5 speed can handle the power, but shifting is its weak points. No hard launches or ridiculously quick shifts. Hurts time, but thats what bigger turbos are for! The MR's 6 speed isn't as durable as the five. Spend the $$ on rebuilding the tranny by Team Ripp or Shep. Preferably Shep, he's the god of DSM/Mitsu trannies.

 

what's wierd about the 6 speed is that it actually feels smoother when you shift fast. only when you shift slow around town does it at times get notchy.

 

From what it sounds like??? You wan to put a 6-speed Trany in a 04 GSR.

Well it is too expensive, and it will require the ACD. It can be done with all the 2005 models. But it will caost you around $5,000 to $6,000 for the up grade.

 

That's actually not true. If you look at the mathematical spacing of the ratios and calculate the maximum speeds of each gear, its clear that the six speed box is superior for acceleration. Especially when you consider how bad the 5 speed car lays down when you upshift to fifth. The fifth gear in the six speed tranny is awesome in comparison. When you get to the 300+whp level, the advantage of the six speed is very obvious in driving.

Now, I can't comment if it can handle a ton of power or not, but I'd love to have the MR's ratios in my car!

 

You would a lot of lose time in the 1/4 due to the extra shift into 5th, though.

https://www.evolutionm.net/forums/sh...9&postcount=21

5-Speed: 1st - 40, 2nd - 60, 3rd - 83, 4th - 113, 5th - 162
6-Speed: 1st - 40, 2nd - 59, 3rd - 80, 4th - 105, 5th - 133, 6th - 166

Not sure I believe those absolute numbers, actually. But they do show that 4th and 5th are shorter on the 6-speed.

For a car with more power and a better torque curve than stock, I would think you would want to stick with the 5-speed with its longer gears to keep you from having to waste time shifting.

 

i thought the 6-speed would be superior in keeping us in our powerband

 

I have no problems staying in the power band with my DSM's 5-speed with a very similar engine setup to an Evo. And my 3rd gear goes to 102mph, and 4th goes to over 140mph. So why would an Evo 5-speed have any issues?

In fact, I have yet to see any DSM drag racer that needs to shift to 5th. Even John Shepherd stays in 4th at over 160mph. That extra shift really is an E/T killer.

I had the same issue when I was at the 100mph range. Should I stay in 3rd, and bounce off the rev limiter, or should I shift to 4th. Staying in 3rd gave me better E/Ts, believe it or not. Once I made enough power to get to the 104-105mph range, shifting to 4th was needed to get the best E/T out of the car. But that shift still cost me some time.

The broader your torque curve is, the less need there is for very tightly spaced gears. And just about every mod you can do to an Evo (besides swapping out the turbo) broadens the torque curve.

 

It will not require the ACD.... the 03 TC bolts to the 05 6-speed.

The 05 5-speed is the same as an 03 5-speed with the exception of come TSB changes, but no major mechanical revisions. The ACD TC is the same in the 5-speed an 6-speed cars. So do the correlation...

03 and 05 5-speed the same, so the 03 TC would bolt to the 05 5-speed. Well is the ACD TC's are interchangeable between the 5 and 6 speed cars, then the 03 TC will bolt to the 6 speed. Voila!!!

 

are you positive about that?

if thats the case, that is an excellent find.

 

well, Jon @ TRE told me that, and considering they're coming out with a "6-Speed swap kit" for 03's and 04's then yeah, I'm sure.