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#16
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Re: 3.7 / 3.54 rear diff
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Filip Last edited by svxcess; 02-18-2019 at 12:24 PM. |
#17
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Re: 3.7 / 3.54 rear diff
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The cost to rebuild the box here in Australia would be about $3500AU/ $2500USD to have it done by the same people that Subaru uses to do their rebuilds. All the parts would be the updated parts, as the older parts are no longer stocked. The box and torque converter would be “as new”. It would take a maximum of 3 hours to remove and replace the box. About 4 hours to strip and rebuild the box, and another 2 hours to open the torque converter, and replace the ‘lock-up’ clutch and re-weld it. I would stress that it should only be done by a competent rebuilder shop that is proficient in working on Jatco transmissions, otherwise it may be a waste of money. I agree that there has been many stories about boxes replaced in the US, followed by another failure. The problem was that most of the cars were early 1992 models, and the early boxes had faulty facings on the clutches that had large pieces flake off to block the cooler, resulting in no cooling or lubrication to the epicyclic gears that overheated and failed. A lot of the rebuilt boxes were then fitted with the same converter ‘lock-up’ clutch, so they have the same problems recurring. The other problems that the US cars experienced were due to the 4EAT box, and the high final drive ratio they were fitted with. The “C” solenoid/transfer valve assembly was slow to react to engaging the rear wheels when the torque was being applied. This could let the front wheels spin in the wet, stressing the front ‘open’ diffrential that would break. The high gearing meant that at low road speeds the engine revved too slowly to maintain sufficient oil pressure, to hold the clutches on, so they slipped to burn up the high clutch or band. None of these problems were in the VTD box with the lower 3.7:1 as the auto pump ran faster to maintain the line pressure and cooling flow. If the “C” solenoid has a problem, the VTD cannot lose drive to the rear wheels, so the front wheels cannot spin to hurt the front differential. The early VTD models still had the flaking lining problem, and the early high clutch that had another plate fitted to it, in the later models. This probably doesn't answer your problems, but this is the best info I can give you. Cheers, Harvey. .
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One Arm Bloke. Tell it like it is! 95 Lsi. Bordeaux Pearl, Aust. RHD.149,000Kls Subaru BBS wheels. 97 Liberty GX Auto sedan. 320,000Kls. 04 Liberty 30R Auto Premium. 92.000kls. Last edited by svxcess; 02-21-2019 at 09:51 AM. |
#18
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Re: 3.7 / 3.54 rear diff
The theory that line pressure becomes inadequate at low engine speeds is not correct as I have proven, having driven many miles with a permanently connected and mounted line pressure gauge directly in front of me. As a result of these statements being continually posted as being a fact, there was good reason to take particular notice in this regard.
By the same token the "A" solenoid is not held stationery at partly closed intervals in order control line pressure as has been claimed.
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Trevor, New Zealand. As a child, on cold mornings I gladly stood in cowpats to warm my bare feet, but I detest bull$hit! |
#19
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Re: 3.7 / 3.54 rear diff
Thanks Harvey for great explaining. Definitely good enough for me !
As post number 9 answered my original question, this thread can be locked. Hope it helps others too. Regards, Filip |
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