Quote:
Originally Posted by Trevor
I have also carried out research and am still doing so, having contacted Subaru N.Z., transmission shops and specialist Subaru parts suppliers. No evidence is available to support the alleged change in the C solenoid, in fact the opposite is the case.
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The opposite is not the case. Based on the facts at hand, the evidence that transfer solenoid C in the JDM/AU transmissions was changed to a N/C design in later models is absolute. Here is the proof:
It is undisputed that all US transfer solenoids are Normally Closed. My Subaru dealer provided the following part numbers for the transfer solenoid:
PN 31942AA 061, US up to 05/95, transfer solenoid
PN 31942AA 090, US 5/95 to 11/96, transfer solenoid
I was told that 090 DID NOT supersede 061.
Japanese and Australian parts catalogs provide the following part numbers:
PN 31942AA 050, 09/1991-01/1994, updated by:
PN 31942AA 051 02/1994-10/1994
PN 31942AA 061, 11/1994-04/1995
PN 31942AA 090, 05/1995-11/1996
These later two Japanese and Australian-spec VTD transfer solenoids are the same PN [exact same part] as US-spec N/C solenoids from 92-97.
The change to N/C solenoid from a N/O is the reason that a TCU for an early VTD transmission will not properly control a later VTD transmission.
This fact was determined independently and almost simultaneously by Harvey with his late UK-spec box controlled by 'early' programming maps, and by myself with a late JDM-spec box controlled by an early JDM TCU in our US-spec '92 Peacock Blue SVX.
Why the change? That in fact, is the question without an answer.