So I am going to send my Transmission into Shep to have the stage 1 rebuild. I am also having the REM ISF process done. I have an evo 8 (5 speed) that will be pushing upper 500 whp on a mustang dyno in a couple months.

My question is, is it worth the extra cash to upgrade to the Evo IX first and fifth gears? In other words does it make a big difference? Also what does upgrading to these gears do, are they just taller?

I feel kind of noobish asking, but I haven't been able to find any solid threads on this. Thanks!

 

Thinking if I remember correctly, the change offers a closer ratio set up--- but maybe you already answered your own question if upon research you couldn't find any conclusive opinion on the mod and its distinct benefits---then maybve it wasn't all it was cracked up to be--at least not what you will be using it for-- maybe for a quick ration gearbox for drag racing or road racing I could see it.

 

I forgot to mention that my car is a daily driver and will see some 1/4 passes every now and then. Not sure if that matters.

 

It really depends upon your intended use with the Evo if you're unsure and can't find the info you need here it' probably just best to ask the guys that will do the work ......Shep Trans

 

I found this very useful
http://www.teamrip.com/gear_ratio_options.html

...and I'm still looking for a JDM 5th for my 9RS

 

The evo 8 trans has pretty good ratios to begin with. I don't think I would spend the 200-300 on the evo 9 first gear to get 6-8 mph. The 5th gear you could change if you wanted to . It will shorten the gap between 4th and 5th . This will be a little easier on the weak 5th gear syncro.
If you plan on going over 135-140 in the 1/4 then you can think about the 4.11 upgrade. A 4.11 gear also makes all the gears taller and you aren't shifting every 3 seconds.

Do you have an 03-04 trans? There were alot of updates from the 03-04 to the 05 unit. It may be more expensive to get it refreshed. There were 2 brand new 05 transmissions left a few months ago in the country. Incase you want to put one on the list.

 

I just got my car back from jack transmission and I did it all gears and rebuild it completely and it runs awesome. I recommend you if you going to open it do it all

 

I did a ton of research over the weekend and decided 4.11 gears aren't for me...with my current goals anyway. I have an 03 trans.

So shortening the gap between 4th and 5th...what does that mean exactly?

 

Thanks for the input!