The problem you would run into is climbing steep hills with the manual transmission, unless you have the automatic WRX. The STi has the larger R180 rear diff, If you could get that with the ARB locker for the Nissan R180 installed you would be pretty unstoppable. $4000 in parts alone
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I wonder how good the low range on the older manuals are (Not for US unfortunately).
steep hills and slow "crawling" are certainly the clutch-death of [USDM] stick-shift Subarus. HOWEVER, there IS a solution, as alluded to by machine1!
In the 90s when Subaru went to full time AWD, they dropped the dual range gearbox in US offerings, BUT they can be attained and they're a straight swap (within reason...e.g. you would probably have some difficulty putting one into, say a 2012 OB with CVT. . . )
There are some considerations and do some research, but JDM eBay sellers are starting to have the dual range FT AWD gearboxes. I have an AUDM dual range SF (gen 1 forester) 5MT in my USDM legacy. it has 4.11 (my stock legacy was 3.90) axle ratio, which I've paired with a RX's CLSD into the rear 4.11 diff. The first gen forester's DR gearbox has a 1.447:1 low range gear set, which I find 1.447:1 is pretty damned capable for a daily-driven, kid-hauling sedan, on 27" ATs, still pulling off 22 city and 25 hwy, as I've taken it down Moab's Lockhart Basin trail and the white rim road (pavement to pavement in under 5 hours) a couple times.
Most likely the DR 5MTs you will find will have the lame 1.19:1 low, BUT this can be swapped for the older PT 4WD Subaru's 1.59:1 low gear.
So, aside from trying to put a 4EAT into a stickshift car, one can get a dual range 5-speed, and it can be made pretty decent for an full time AWD car.
Along with the couple trails I mentioned, I've taken my rig places it has NO business being, in stock and questionably even in its currently modified version, and successfully so. I live in Moab, I'll leave it there. . .
ciao, and I'm loving the contributions to this thread! :smiley_drive: