Transmission

[jimz993]

I am planning in changing the trans fluid of my 993 c2, after noticing some roughness when shifting. I am a little concern about possible problems after changing the fluid and I want to make sure it is completely safe for the car doing this procedure.
All your comments will be much appreciated.

[Tom W]

There are DIY instructions for the job on Rennlist and likely here too. It is a simple DIY that you should not worry about. Roughness shifting from 1st to second until the car is warm is normal.

[BReyes]

Roughness in shifting is pretty serious words. After seeing what PO can do to 915, I have never let friends drive my G50. At least if anybody is going to break it it is going to be me, huh?

Have you thought it may be bushings?

[Newsboy]

Depends what you mean by roughness. After I changed my gear oil to Redline, I noticed an improvement in shifting into 1st gear. Putting the gearshift in 2nd & then 1st when starting out will also help. So Redline or Swepco is what I hear recommended the most.
I used a piece of flexible 1/2' tubing, inserted in the fill hole and routed up above the wheel with a funnel attached to ease getting the gear oil in.

[Bill Verburg]

Originally Posted by Newsboy

Depends what you mean by roughness. After I changed my gear oil to Redline, I noticed an improvement in shifting into 1st gear. Putting the gearshift in 2nd & then 1st when starting out will also help. So Redline or Swepco is what I hear recommended the most.
I used a piece of flexible 1/2' tubing, inserted in the fill hole and routed up above the wheel with a funnel attached to ease getting the gear oil in.

Swepco is certainly the fill of choice for a 915

but factory fill and recommended for every XX/XX race trans has been Mobil 1 Delvac, it used to be called SHC