Final quote in from Cork Gear Box Centre for €2k including Vat and 12 month warranty. Full rebuild including torque converter etc
Ironically the price I paid for the car!
Sent from my LYA-L09 using Tapatalk
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Final quote in from Cork Gear Box Centre for €2k including Vat and 12 month warranty. Full rebuild including torque converter etc
Ironically the price I paid for the car!
Sent from my LYA-L09 using Tapatalk
I think you'd be nuts not to try topping up the fluid for the sake of 30 mins and a few euro - the original job done by the PO may have been lacklustre
I have heard of these GM 360/390 R boxes occasionally loosing pressure as the fluid get's warm. I remember coming across it whilst researching the fluid changes. As a precaution I changed my main pressure regulator (the common denominator in terms of fixing) on the valve body whilst I had the pan and filter off. you also have to loosen (emphasis) on loosen! SOME of the retaining bolts of the valve body down from the underside of the transmission, so the regulator clears the tranny casing. I remember there were two bolts that couldn't be touched (but had the same bolt head design) if you inadvertently undo those, you could have a valve body separate and end up chasing ball bearings and check valves around the floor. So my post is to say that the regulators can fail, it is often associated with temperature build but to be careful installing a replacement regulator.
I used to have a printed copy of the rebuild manual for these, I'll try dig it out and scan the relevant page.
There are resistance checks that can be done on the regulators at different temperatures with a tolerance of +/-15%, the regulator cost me around €60 if I recall correctly. At work now, but will search for the manual when I get a chance.
Scan of manual page that details the spec in terms of ohm readings @certain temps for the pressure reg.
Another check before you drop the pan and filter is to put a hydraulic gauge on the pressure test port of the gearbox. it's just below and immediately forward of the oil cooler ports.
In P N D M4, M3, and M2 you should be developing between 48 and 180 psi, if your on the fringes of 48psi, the box is shot. in reverse the box should develop 60 to 230 psi.
if the box could engage reverse soundly before failure, i'd be looking at the fluid levels and regulator, if it had difficulty with reverse and you find readings on the fringe of the drive specs, the pump is probably shot and if rebuilding that, the clutches are as well done during the rebuild.
Note the two screws described above that shouldn't be undone to get the PR into place by dropping the valve bank, they are detailed in the scan attached.
Sorry took a while to find my manual and sheets - hope you get sorted and continue the E39 strength of population!
Joe
No worries Philip, hope it helps and you get sorted soon!
had few cars with box repairs, and 99% of these boxes , once they stop going, its full,and only full rebuild ,I mean E39 and early X5 .and with that mileage this is no chances for other small failures