Did Swepco reduce gear noise for you? I'm leaning toward Swepco 202 for that reason. With the rear seat delete, anything that reduces gear noise is a big plus for me. In the past, I did try Royal Purple and Amsoil because they were said to reduce noise, but neither seemed to help.icb wrote: Sat Jun 14, 2025 11:49 am I use Red Line MT 90 as well, but I too have an open diff. I believe it will work with an lsd, maybe you'll need an additive. Definitely check, I'm not 100%. Anyhow, I love how the shift feel is, even when cold it still shifts great. It doesn't smell bad, and it's even a nice color! It transformed my transaxle. One thing though, if you have been running a thicker oil like swepco 201 and there's wear in your trans or differential gears/bearings, the mt90 won't mask the gear noise like the swepco did.
Transmission Fluid Recommendations?
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Tom
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Tom
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How funny (or creepy) is this. Before ordering Swepco 202, I wanted to make sure it had LSD additives. I googled it and was comforted that the google AI answer said yes. Then I noticed it's source (this thread) and had to laugh...
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icb
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Tom, I don't know for sure if it was swepco, it was what came in Gretchen when I bought her. It was thick, stinky, and probably 20 years old or more.
I flushed it out with mt90 then re-filled it again with mt90 after a few hundred miles. I noticed the whine from my excessive ring/pinion backlash immediately (about 6-7 mm at the cv axle flanges). It was silent with the old stuff. I ran two years, then changed it (mt90 again) and had a used oil analysis done, with excellent results, wear metals in the mt90 sample were low and within normal, expected limits. There was 12,000 miles on it.
I flushed it out with mt90 then re-filled it again with mt90 after a few hundred miles. I noticed the whine from my excessive ring/pinion backlash immediately (about 6-7 mm at the cv axle flanges). It was silent with the old stuff. I ran two years, then changed it (mt90 again) and had a used oil analysis done, with excellent results, wear metals in the mt90 sample were low and within normal, expected limits. There was 12,000 miles on it.
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Tom
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I went with Swepco 202 and was able to drive it today. The difference is noticeable -- quieter than before and a noticeably smoother shift into first and second. Worth the extra cost in my book, especially if you have notchy/stiff shifts. Thanks for the heads-up!!cda951 wrote: Thu Jun 12, 2025 7:10 pm Swepco 202, it's a synthetic version of 201, so good for LSD transaxles but offers improved shift quality (I've always used 201 in my own 951 with LSD, shifting a tad notchy when cold, but great wear protection for track use). 202 is pricey but worth it, has even been a worthy band-aid for worn second-gear synchros on a couple of customer 951s.
