Moonrover333

ok so bout october last year i had my transmission rebuilt via mazda warantee. i had them fill it with Lubro-Moly 75w-90 synth gear oil. now lately when the tranny gets hott it has a tendancy to grind from 2nd to 3rd from 8k up. and now just this past couple days its a really quick grind when i rev match down to 2nd (with use of clutch) now i know my clutch is wearing bout but i don;t see how that could cause it. i'm wondering if it is a heat issue or what. its really getting old with this car. its always SOMETHING fuckign up. also i'm not running any cat and if i sit at idle for a good bit it relly grinds alot goin into 3rd. i'm thinking of draining gear oil and replacing with redline mtl, and lucas, and heatwrapping around exhaust near the tranny. do you think that will help.

also would any other tranny work in our car? like the fd or fc tranny?

agoodcave

Before going to the extremes of tranny swaps or rebuilds, I would replace the clutch, if you suspect wear. A worn clutch will prevent it from performing its function and put more strains on the tranny. My 2cents.

Mike

Moonrover333

i have a fidanza flywheel, and centerforce dual friction sitting in my room i just need to get the bearings, and counterweight to do it. and also i'm gonna try the lucas and mtl thing. i just don;t have the money now for the rest of the pieces for my clutch

Nubo

Since your problems seem to be happening when hot, I'd try the Redline MT-90. A bit heavier. Some people report that a mixture of MTL and MT-90 is the best. Ymmv.

sunshineRX8

hey i have the same problem what should i do to get it rebuilt like what should i say to get them to do it and will my warrenty cover it if i have mazdaspeed intake and an aftermarket exhaust.

Astral

they can't deny your transmission warranty because of your intake and exhaust, they are not at all related.

TeamRX8

iTrader: (25)

I'd recommend MT-90 at a minimum, or Redline Shockproof Heavy for maximum durability, MTL is only a 75W80 and may sacrifice long term durability, my last one broke using it so I went to a heavier fluid (75W140NS at first, now Shockproof Heavy)

a clutch going bad can be the cause of grinding, you might try bleeding the clutch hydraulic circuit and make sure the clutch pedal is adjusted to spec per the service manual

RX3+5

Shockproof Light works great as well!

Vince

TeamRX8

iTrader: (25)

but at the expense of durability, since the Heavy matches the OEM fluid viscosity I prefer to have max durability, on my 3rd trans and less than 5000 miles ...

mmats69

but they will try to hint that he's been abusing the car

Moonrover333

i went with half MTL, and half lucas. shut it up directly after 1 day. its a lil rough when cold tho but am going to switch again after i do the clutch

Shinka-05

have any of you had this problem....

I have taking it to the dealership and they said they didn't hear the noise. I should of checked out another RX8 to see if it made the same noise or something. Instead I am asking you guys.

When I go about 7,500 or so, what seems to be my transmittion, sounds like it has little bits of metal in it spinning around or something. Like kernals in a popcorn popper or something to that affect. It last till redline. Free rev or under load the sound is made.

If people hear the same sound, let me know. Otherwise take a shot at what could be wrong. I think there is teeth missing of my gears or some sort of metal. Makes me kinda mad that the dealership said they couldn't hear it because it isn't quite.

Paxhumas

okay just recently i have been having a similar problem when i am either accelerating hard in high revs my transmission grinds when i try to go from first to second or if i am trying to downshift from thrid to second and the revs are high it doesn't do it when i shift at low revs do you belive that this is a clutch problem like yours or something different any help would be appreciated

secret8gent

shinka-05, are you sure that isn't the final stage of the Sdais system? (sequential air intake...) It opens up about then and has a distinctive sound....

just a thought.

Shinka-05

I don't think so... cuz it sounds like its more from underneath the car. Also, I forgot to mention, that I am having the same "sticky" shifting going from 1st to 2nd up-shifting, and when down-shifting from 3rd to 2nd.

I am taking it in, technically, today/morning so we will see what happens.

Shinka-05

may I ask what your problems of the first 2 were? If I am not mistaken didn't you have problems with the smell in your car as well?

TeamRX8

iTrader: (25)

blew out 2nd gear on both following a 1-2 drag style upshift