mh944

In my s2, shifting from 1st to 2nd above 4500 rpm, it grinds. Below 4500 rpm is no problem. I would like to know from you guys if this is definetly a syncro mesh problem. Can changing gear oil with a specific brand solve this problem. If so, which brand and blend please. If not, What is the best way to fix? How much do used s2 trannys go for?

My tranny has about 180K on it.

Thanks in advance

Mh944

'89 S2
'91 325is
'91 735il

Tom R.

try synthetic oil. it helped when mine wouldnt shift easily when cold.

jabbadeznuts

The 2nd gear synchro is a common problem on the 944 transmissions. Like Tom said, try switching gear oil.

Yabo

redline mt90 which i got from paragon lately and just put in is what im using. but havent driven on it yet

mh944

Which is better, mobil 1 or redline?

Mh944

'89 S2
'91 325is
'91 735il

jinotown

Try Redline MTL or MT90. My '83 was grinding. I first used Mobil 1, 100%synthetic. It was worse than ever! Then I tried the MTL. It made an amazing difference! I now use the car for track use only with no problem. Those two lubes are GL-4 rated. Most off the shelf gear lubes are GL-5 rated. The "5" stuff is too slick for the synchros. The additives are also corrosive to the brass synchro rings. There may be others that work well. Stay with the factory recommended GL-4 rated lubes.

seb928s

Swepco does wonders also. I can feel the difference after when I went to swepco just I didn't have any grinding sounds it was hard to shift when cold and now it's better with Swepco 201 I think it's something like 90w75.

Luis de Prat

When my S2 did just that, it turned out to be a failing clutch disc. I hope yours is a minor fix.