I feel my gear box is not very smooth, especially when i shifting from 2nd to 3rd gear. where and how to check the transmission fluid level?

 

Undo the Filler plug( highest plug on the driver's side of transmission)
If oil oozes out it is full.(put plug back in)
IF it doesn't stick your pinky finger in and see if you can feel the gear oil.If you feel no oil then fill until the gear oil oozes out and replace the filler plug.

 

s4? s5? turbo? n/a? delorean? studebaker? pontiac cheiftan?

need input, Number 5 need input!

 

you should see where #5's filler is!...haha....(uh..NOooo...not doing that ..!)
(do not want to check it....lol...!)

 

You really need to give us some specifics on your car. On my 85 SE, switching to Red Line trans oil smoothed out my shifts a bit.

 

His previous posts show a S5. OP...you should put it in your signature so you can't forget next time.
Regardless, you have one drain plug and one fill plug as Styx explained. Looks like maybe page J1-7 in the owner's manual. Put it up level on jack-stands. Remove the fill plug and fill (I'm guessing with GL-4 85w-90) gear oil of your choice until it drains out. Parts stores have small hand-pumps that will screw on to the gear oil bottle for this purpose. Put a little Teflon tape or paste on the pipe-threaded plug and replace it. Wipe the area clean and you're done. Obviously if you've never changed it, it wouldn't hurt. Probably will take 2.5 quarts or so. You can check your owner's manual.

 

Thanks to all

 

Which brand do you guys recommend?

 

^^^
That's like asking what brand of beer do we recommend while doing it. I prefer synthetic (gear oil ), but if you're just topping it off and not changing it, it really doesn't matter....IMO.

 

some Beer does taste like gear oil..(!!!)

 

Synthetic works best. Common brands are Red Line, Royal Purple, Idemitsu, and Amsoil. Personally, I don't trust Mobil 1 because they refuse to list the contents of their base stock, but otherwise I don't see much difference in the various brands, especially for a street car.

In St. Louis, beer tastes like yum!

 

Brapp Beer...contains 5% boost..(haha!)

 

Rx7 N/A transmission always feel a little rough. 2nd and 3nd are know for being a weak spot if you drive the car hard. I've used low miles transmission feel only a little better then one with more miles. Just make sure the shiftier bushings are in good shape and both of them are there. BOTH

 

He should probably check the oil level in the extension housing...where the shifter inserts. IIRC, it specifies the shifter be submersed in gear oil, but from experience if you put some grease on the ball and lower bushing before filling the housing up with gear oil, it helps some with smoothness.
If the synchros are worn...nothing will help.

 

Redline MT90. Best tranny fluid!!!

 

^ No doubt this will come as a big surprise to those who thought NEO, Royal Purple, Amsoil, Motul or M1 was the best.

And I'm just a commoner when it comes to beer. Got hooked on Sam Adam's seasonals some time ago. Haven't found one yet that doesn't go with a decent cigar.

 

I agree and does not affect your syncros while fast shifting. I use it on my FD and supercharged RX8. BTW, had bad experience with Royal Purple on my RX8, lots of grinding while fast shifting. All gone after switching to MT90.

 

I just did mine with NEO. Was hoping that it would help with 1-2 shift more but didnt really. Going into first is much better though.