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Originally Posted by SVXMAN2001
Great info guys. I've been researching TAE auto parts and they seem to have a good supply. However, further research has shown that if I were to go with the R180 differential, I would also need the hub/knuckle as well? Apparently the axles associated with the R180 are larger in diameter and require the wrx/sti hub assembly for fitment.
If this is true, shocks and struts would need to be modified as well no? I can't imagine everything else bolting right up to the knuckle.
A quick question on the R180 (3.9 final drive ratio) vs the R160 (3.54 final drive ratio). If I were able to obtain a 2006-2007 6 speed as mentioned above, i could remain with the stock svx rear differential. Will this mean that my final cruising speed would be similar/exact to the auto? meaning, at 60 mph in 6th i'd be at about 2k rpm?
Thinking this through (i am doing a lot of calculations and reading, while writing this)...the rear differential associated with the 6 speed is the R180 with a 3.9 final drive ratio, however effectively 3.54 due to the 1.1:1 center differential, correct? So then i'd have two options, remain with the stock svx differential and if i so choose down the road go with the 180 which would require modification for fitment and the WRX/STI axles, correct?
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if you had a wrx and went to the R180 you would then need the sti knuckles/hubs, but not so with the SVX this car already uses the larger 5x114.3 hubs. the sti axles will slide right in just as if you put them in the sti hubs, (just a side note our rear hub bearing is the same bearing the sti uses)
As to the rest of your questions/comments.
No need to change suspension, as the svx hub will work, in fact putting the sti hub in would be very very difficult and probably require extensive machining.
and to the gearing vs rpm you have a couple things off, the sti 6 speed uses a final drive of 3.9 but the 06 and up do this by using a 3.9 front diff, a 1.1:1 center diff and a 3.54 rear diff. the 04-05 used a 3.9 front 1:1 center and 3.9 rear. so no the svx won't have a 2k rpm at 60, but its not far off either. here is my car after the 6 speed swap. this is a long video you don't need to watch all of it I will have it start near the appropriate place.
well it doesn't seem to want to work here so here is the link, I suggest looking from about 10 mins on for some typical highway speeds.
https://youtu.be/02v8SMjL4WM?t=11m21s