hey guys, I've done research about this and I've seen many different posts but i couldn't find one similar to mine.
04 MT 77k miles

My car grinds into second gear in high rpms and it has done it before but it went away. just recently I flashed my ecu into stage 1 and now its starting to happen again today and i reflashed my ecu today. should I just drive slowly until the car gets used to the reflash or what?


Posted from Rx8club.com App for Android

 

If you haven;t changed the transmission oil recently, I'd suggest doing it. The reflash is for engine management, not your tranny.

 

As Cro8tia said changing your tunes won't have any affect on the transmission.

As recommended do a transmission oil change, something like Redline MT-90 is a popular choice.

If the problem persists, it could be a pedal position problem or your synchros are going bad.

 

alright ill change the tranny oil. thanks. lets see how this plays


Posted from Rx8club.com App for Android

 

If you haven't already changed the transmission fluid.. check out Amsoil..

I just did a fluid change with their 75w-90, and WOW what a difference. Shifts are so much smoother now and it just feels better.

AMSOIL Manual Transmission & Transaxle Gear Lube 75W-90

Just throwing it out there..

Also, if you haven't done it recently.. you might as well change the diff fluid while you're under there!

 

the clutch free play can be checked, and you can shift slower...

 

shaggyp: the advice given so far is very good.
I would flush the fluids (transmission and differential) with either Eneos or Redline. Based on my personal experience, those are the only fluids I would recommend (aside from OEM)

after that, check your clutch pedal for play and to make sure the welds aren't cracking.

Hopefully that clears up the issue but if it doesn't, the issue is most likely bad synchros and you're in for a rebuild if it keeps getting worse.

 

Eneos 75W90 Gear Oil | Black Halo Racing

 

$90!!??

 

$90 is for 6qts. you can do trans and diff and have enough to do it again

 

Oh ****... Okay that makes sense, I didn't see how many qts it brings so that just left me shocked lol

 

yhea i emailed charles before i bought it. i was thinking the same thing lol

 

75W90 GL5 will destroy your trans, straight 90W GL4 only!

 

I was under the impression you should stay away from RP's GL5 trans oil, not GL5 in general...

 

BHR has a blog post on GL5 on their site i believe.

 

Yeah, I think there are things getting mixed up here.

GL4 for the transmission, GL5 for the diff.

I've used Redline MT-90 (which is GL4) in all my Mazda transmissions, and Redline 75W90 (which is GL5) in all my Mazda differentials. Zero problems.

People that put GL5 in the transmission have syncro failure within about 10,000 miles. I think the only exception to this is Eneos that BHR sells? It appears to be a GL5.

I don't recall any mention of anyone using GL4 in the diff to know if there have been any diff failures from it. Then again, it's rare we see a diff failure discussed.

Edit: here is the BHR blog post about Eneos: http://black-halo-racing.myshopify.c...eos-75w-90-uoa

 

thanks guys. ive been running it in my trans and diff over a year now. i did keck03s last year too. he drives a lot more than me and hes sced

 

To determine if synchros are the cause as opposed to perhaps dogteeth lubrication, try double clutching. If it removes the problem altogether by doing that, it may be that the synchros are on the way out.

 

Just to update. I changed the oil and at first it still grinded but after a while of driving it went away . Thanks