Yeah, I didn't bother trying to contact Jon@TRE on the forums. I sent him a detailed email with my contact numbers (multiple) and a note that the timing was urgent. I know my urgency isn't his urgency, but I thought he'd at least respond in a reasonable timeframe. However, most folks have said he is very difficult to get a response from, and I see that was true. No big deal - I know he's a great guy. I just can't get my diff modified.

 

Thanks for all the useful info!

 

FYI, Jon contacted me (thanks, Kyoo!) and was great to talk to. I plan to do business with TRE moving forward, but it depends on what car I end up having/using/building.

 

Good to hear you got in contact with him. He stays busy and,from his description of the place, has a good size shop. I spoke to him about it, he knows hes hard to get a hold of, lol... oh well, once you get a hold of him though its worth it.

 

great, good to hear! (evo 9.. evo 9..)

 

why evo 9 and not 8?

 

pretty much same thing.

got a chance to drive the evo in the wet at an autox course sunday - first time driving any evo in about a year and half in anger. spun out twice on the first run from going wot lol! too used to fwd and no power

 

Well, took the car to Pocono for an autox this weekend (major hold up in my season this year), I still can't really tell my car now has a TRE diff. I have driven a friend's car with the TRE diff in it, and it was very obvious as you guys have mentioned. So I am not quite sure what to conclude out of this other than opening up the diff to see (which will be a major pain).

I guess I will do a few more events and pay a bit more attention to it, but I would imagine it should be pretty darn obvious.

 

As simple as this may seem, try new ACD fluid and make sure all sideline fluids are up to the proper levels.

 

im surprised regardless, should be very obvious

 

The wrong fluid or improper level can negate the effect. I'm surprised at how sensitive the Evo drivetrain can be to fluids!

 

If you have been out to the same track or autox, with the stock diff and the TRE diff, it should be noticeable difference. Even a spirited drive on the streets you may notice something, but just cruising around you may not, or at least I dont.

 

that's true - i've had both 75w90 and mitsu sae90 in the rear diff, and it makes a difference. lot of slipping and banging with the 75w90, quiet and more subdued with sae90 - however, either way when i got on the throttle in autox = total oversteer. to not be able tell the difference at an autox from tre's rear diff and stock rear diff, regardless of fluid, seems odd

 

Thanks. My plan is to switch out the Diaqueen stuff and put in Redline 80W140 GL-5 to see if there would be any difference.

Would the 75W 140 NS GL-5 work for maximum lock-up? (not to be confused with the regular 75W 140, which has friction modifiers in them)

 

honestly i wouldn't yet - are you sure you've got a TRE rear diff? again while the fluid makes a difference, at an autox you should be able to tell regardless of what's in there.

did you get the diff with a sight glass? does it look repainted? etc