SY3500 and 3.42 gears
Where did you get an SY3500 from? I'm guessing you've had it for a while, or you bought it used.
If you got it new, did you go direct through Yank? That'd be great if they'd still make one upon request.
I had that 'verter in my WS6. I loved that model for street use. Didn't hit very hard at the track (best 60 foot was 1.69 w/ 3.23s and DRs) but on the street the soft initial hit with looooooong torque multiplacation and super efficent top end was great.
I'd consider getting another one eventually if they could still be had new. SY3500 + 3.23s is a great street only combo, but for the track with sticky tires I'd recommend something more aggressive than 3.23s or 3.42s if you're going to run a SY series. 3.73 would probably be better.

But again, as for your question I'd say either get 3.73s or just keep what you have. 3.23 to 3.42 upgrade isn't going to be noticeable enough to justify the time or money to do the swap. The gains will be minimal at best.
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it was very eff. thru the RPM range also but the parts special built by GM and hard to get and with short supply and high demand high,
YANK came out with the SS model it combines the best of the SY, ST into one converter
But the SY is still a bad dog on the street with a 3.42 or 3.73 gear
it was very eff. thru the RPM range also but the parts special built by GM and hard to get and with short supply and high demand high,
YANK came out with the SS model it combines the best of the SY, ST into one converter
But the SY is still a bad dog on the street with a 3.42 or 3.73 gear
The SS series has too much STR for a Z-rated street tire, IMO.
Less gear will allow for a better hook but will also make the converter work harder around town so for the best overall performance a 3.73 gear was listed
I have seen many cars that run 3.43 gear and go fast, it is every car is not the same type of thing
This is what sold me on the SY back in '00. It's all very true, and as you can see they recommend 3.73s for best results. However I was very happy running 3.23s as well, but I was limited to high 1.6 60-foot times. I bet a 3.73 gear would have put me into the low 1.6 range or maybe even a very high 1.5.
We have some of the special stators left, and are looking into remaking the stator at this time, but are also testing other designs so we might have a replacement unit soon!
now w/the converter forget about it 






