928 Forum
Sponsored by:
Sponsored by: 928 Specialists

Automatic transmission noise only in 1st and reverse

Old 05-07-2010, 11:58 AM
Rennlist Member
Thread Starter
taffelman's Avatar
Join Date: Aug 2006
Location: Norway
Posts: 161
Likes: 0
Received 0 Likes on 0 Posts
Default Automatic transmission noise only in 1st and reverse

1990 S4 Auto (70k miles)

The noise is "turbine like" and sound to my ears like an oil pump reving up fast and then stays at high speed. The sound is coming from the gearbox.

The noise is only noticeable in reverse (standstill or moving) and when driving slow in first gear. Pull the shift-stick into 2nd at low speed and after it downshifts into first gear the "turbine noise" revs up.

I changed gear oil last summer, but that had no effect. When driving in "D" or "3" or "2" (without it shifting into first) the gear box is dead silent and shifts perfectly. Silky smooth when driving nice, punching hard when driving like a mad man.

It's been like this for years and after almost 20K miles in my ownership it stays the same, not getting either better or worse. I still doubt this is normal though, so anyone got any ideas what it might be?
taffelman is offline  
Old 05-07-2010, 02:22 PM
Rennlist Member

This Post Sponsored by:
Dow Corning« & DeoxIT«
Mrmerlin's Avatar
Join Date: May 2004
Location: Philly PA
Posts: 22,753
Received 3 Likes on 2 Posts

it sounds like a front pump gear whine . if the oil levels are good and your not finding any metal in the samples then keep on driving unless you want to take it apart and try swapping in a new or different front pump
Mrmerlin is offline  

Thread Tools
Search this Thread
Quick Reply: Automatic transmission noise only in 1st and reverse

Contact Us - About Us - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to and affiliated sites.
  • Ask a Question
    Get answers from community experts
Question Title:
Your question will be posted in: