Trans Failsafe

[EODguy]

I wonder if these torque converters can be cleaned out the old school way by drilling a hole in the side, flushing then installing a short bolt tacked and ground down. (Balancing required)

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[Clavurion]

Originally Posted by EODguy

I wonder if these torque converters can be cleaned out the old school way by drilling a hole in the side, flushing then installing a short bolt tacked and ground down. (Balancing required)

Probably could be but what would be the point? A worn TC lockup clutch is a typical cause for total gearbox failure.

[Purplecty]

Had the TC rebuilt and purchased 3 gallons of valvoline import ATF

[crystalworks]

Originally Posted by Purplecty

Are those both the same fluid but slightly different packaging?

I always use the MaxLife version below.

[Purplecty]

Originally Posted by crystalworks

Are those both the same fluid but slightly different packaging?



I always use the MaxLife version below.

Yeah it looks like one has updated labeling. The barcode numbers on the back match. Napa has it for 6.49 a qt so autozone matched the price and let me take the gallons which were priced at $35 each. I have maxlife in my E38 which works well. The import seemed to have almost identical specs as the ZF fluid the last I compared spec sheets.

[crystalworks]

Originally Posted by Purplecty

Yeah it looks like one has updated labeling. The barcode numbers on the back match. Napa has it for 6.49 a qt so autozone matched the price and let me take the gallons which were priced at $35 each. I have maxlife in my E38 which works well. The import seemed to have almost identical specs as the ZF fluid the last I compared spec sheets.

Gotcha.

I wonder if the import is as thin as ZF LF6 (your 4.6 probably uses LF5?). That's why I stopped using it. In fresh transmissions it works great, but anything that's seen 100k+ without a service and I've had no luck with it. Almost always end up throwing in the MaxLife.

[Purplecty]

Maxlife VS Import specs

[Purplecty]

Finally got the used trans in with a bunch of other work done too. Now with both the original and the selector switch that came with the trans it will go into R and then disappear on the cluster with no failsafe errors and the wheels stop spinning. If you wiggle the shifter R will return and the wheels will spin again. If R disappears on the cluster I can sometimes wiggle the shifter or slightly move it a hair towards P ans it will return. The cable has been adjusted and checked multiple times but stuck on this right now. Same symptoms with N. If you drop it down to D and back to R it usually stays lot and everything is functional but if you start at P the issue returns. The console light also appears as if the cable needs is out of adjustment but pretty sure it has been adjusted properly. Check the attached videos and please share any ideas which would be greatly appreciated! When in gear the trans worked pretty well for the short drive to put gas in it so far.

https://www.dropbox.com/scl/fi/ldhvl...=56sfukqd&dl=0

https://www.dropbox.com/scl/fi/qe60b...=fwwu4oqp&dl=0

https://www.dropbox.com/scl/fi/epcs2...=h0rda05t&dl=0

https://www.dropbox.com/scl/fi/jlyhg...=fo9u4x89&dl=0

- Used 4.6iS Transmission 5HP24 034UK
- Rebuilt Original 4.6iS Torque Converter
- Trans Filter / O-Ring - ZF / Genuine BMW
- Trans Pan Gasket - Genuine BMW
- Trans Fluid - Valvoline Import LT71141 (12qts)
- Torque Converter Seal - Genuine BMW
- Rear Crank Seal - Corteco
- Rear Engine Cover Coolant Gasket - Genuine BMW
- 88c Thermostat- BEHR / MAHLE
- Coolant Expansion Tank - Genuine BMW
- Engine Mounts - Corteco
- Expansion Tank Hose - Rein 11537505950
- BMW Blue Coolant
- Bilstein B4 Front Struts / Rear Shocks / HR Lowering Springs
- Shock Mounts

[andrewwynn]

How's the trans connector look? It should have just been reconnected but if was dirty and not cleaned I've seen similar

[andrewwynn]

With the scanner you should be able to monitor the L-pins value and compare to a chart of what they should be.