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Old 11-15-2010, 08:23 AM   #1 (permalink)
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http://members.iinet.net.au/~wearne/...ns%20Specs.pdf

What I would like to know is the missing info for a TY755VB1AA gearbox
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Old 11-15-2010, 08:33 AM   #2 (permalink)
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and what else could fit
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Old 11-15-2010, 11:01 AM   #3 (permalink)
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The TY755VB1AA box is also fitted to the MY99/00 Aus turbo Forester. (Destination Code KA for Australia)

http://opposedforces.com/parts/fores...sion_assembly/

I would imagine it has the same main ratios as UK S-Turbo but without the oil pump.

Drop down gears would be 1:1 and 4.444 front/rear diffs.
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File Type: pdf MY015MTspec.pdf (22.5 KB, 158 views)
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Old 11-15-2010, 01:30 PM   #4 (permalink)
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Good work fella


so

3.454

1.947

1.366

0.972

0.738

front and rear 4.444
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Old 11-15-2010, 01:34 PM   #5 (permalink)
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Does that mean that only gearboxes with the FD of 4.444 will fit

and that the gear ratios determine how the car drives in terms of a higher top gear for instance
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Old 11-15-2010, 01:51 PM   #6 (permalink)
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Fitting any other G/B would mean swapping out the rear diff as well.

Most (if not all) UK 2.0L Impreza boxes are 3.900 front: 1.1 drop down: 3.545 rear.
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Old 11-16-2010, 12:20 AM   #7 (permalink)
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Assuming all my info above is correct another way to retain the 4.444 diffs would be to obtain an S-turbo G/B and then (depending upon whats wrong with yours) swap your transfer casing over to retain the 1:1 drop down gears.

No rear diff swap required.
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Old 11-16-2010, 12:55 AM   #8 (permalink)
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Thats what I thought

looking at that chart there are a few JDM Imprezas with 4.444 final drive, just not sure if thats the same front and back?

My gearbox is getting a bit notchy, especially 3rd to 4th, OK if you take your time, but not snickity click / knife through hot butter smooth.

Just weighing up options of a future replacement / rebuild / cost etc
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Old 11-16-2010, 12:56 AM   #9 (permalink)
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Rear diff swap or / and front diff? if UK box fitted?
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Old 11-16-2010, 02:47 AM   #10 (permalink)
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As per pdf above, the UK S-Turbo G/b comes with the 4.444 front diff, 1:1.081 drop down gears and a 4.111 rear diff.

If you re-used your transfer case that has 1:1 drop down gears, then no rear diff change.

If your box is just beginning to get notchy from 3rd to 4th then initially an oil change to Castrol Syntax or even Redline Shockproof light (Smurf Blood) can produce excellent results.

I changed mine at 85K to shockproof for that reason and had no problems after, 120K and still going strong. (although not with me anymore).
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Old 11-16-2010, 03:46 AM   #11 (permalink)
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ahaaaa

the cheaper alternative first methinks

cheers ill try the redline, and report back

thanks Don

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