Transmission swap in E38/E67 vehicle.

[PSWired]

I put a 6L80e (with its T43) behind an E38 ECM with an OS designed to work with a 4L60e/T42. For the most part, things worked fine, but there was one big bug- the engine would go into reduced power mode every now and then. The problem went away after loading the correct OS into the ECM (one designed for the 6L80e).

A more recent problem I'm having is using a 2007 era OS in the TCM and 2009 OS in the ECM. Some of the message structures must have changed in the two years, because the ECM is not correctly reading the gear selector position from the TCM anymore. No backup lights, no crank relearn (ECM always thinks trans is in D), no idle speed compensation during garage shift, etc.

You'll probably get something that works, but expect some bugs.

[XLR8NSS]

I have an E67/T42 setup right now. It's an all wheel drive Trailblazer SS.

I'd like to put a 6L80E/AWD trans setup in it but, I don't think there are any E67/T43/AWD combinations out there.

Do you think I could swap to an E38 ECM? Then I wonder if all my gauges/etc would work.

If these came with E38s I think it would be a much easier swap as there are E38/T43/AWD combos out there already.

[ChipsByAl]

The Trailblazer swap is an interest of mine as well. The 2009 Trailblazer will have the E67 ECM and it may be similar to the 2009 CTS-V E67/T43 combination.

[XLR8NSS]

The Trailblazer swap is an interest of mine as well. The 2009 Trailblazer will have the E67 ECM and it may be similar to the 2009 CTS-V E67/T43 combination.

I'm not sure how that helps, the '07-'08s already have the E67 in them. The '09s are not getting the 6spd afaik.

2wd TBSS already have an option for E67/T43 setup, not sure if it would work though since it's car setups.

[ChipsByAl]

The AWD Trailblazer SS transfer case has no shift functions or any module controls. It may be that nothing needs to be done different for it compared to the RWD Trailblazer SS. For my H0160 in the ECM, the "drivetrain type" is Not Defined. How different are the RWD vs the AWD Trailblazer SS ECM and TCM files?
Al

[XLR8NSS]

Hmmm, I don't know but, will check mine out here in a bit after I eat.

CTS-V would be a nice OS too since it's factory boosted. My TVS1900 will be here soon.

[gmh308]

I put a 6L80e (with its T43) behind an E38 ECM with an OS designed to work with a 4L60e/T42. For the most part, things worked fine, but there was one big bug- the engine would go into reduced power mode every now and then. The problem went away after loading the correct OS into the ECM (one designed for the 6L80e).

A more recent problem I'm having is using a 2007 era OS in the TCM and 2009 OS in the ECM. Some of the message structures must have changed in the two years, because the ECM is not correctly reading the gear selector position from the TCM anymore. No backup lights, no crank relearn (ECM always thinks trans is in D), no idle speed compensation during garage shift, etc.

You'll probably get something that works, but expect some bugs.

Yes the T43/E38 pair tend to be very fussy when you least expect it. Some OS/cal pairs work better than others. Some are downright risky to try. Did the speedo still work with the E38 A4 OS, expecting a hard wired VSS vs a CAN message?

From what a GM guy was telling me, the 09 setups are a lot smarter than the earlier OS's. They expect the BCM to be the VIN repository, and are a lot tighter on what flash they will allow, and with the wireless workshop setups, the flash is fully downloaded and checked for integrity (checksum?) before the various modules (ECM/TCM/BCM/ABS/ECBM etc) execute the actual flash. He wasn't sure whether this was done by the individual modules i.e. E38stores old and new image at the same time, or handled by the BCM. Also the BCM tells all the modules (a dozen or more of them....) to shut up and be quiet while the downloading is done.

Cheers.

[PSWired]

Yes the T43/E38 pair tend to be very fussy when you least expect it. Some OS/cal pairs work better than others. Some are downright risky to try. Did the speedo still work with the E38 A4 OS, expecting a hard wired VSS vs a CAN message?

From what a GM guy was telling me, the 09 setups are a lot smarter than the earlier OS's. They expect the BCM to be the VIN repository, and are a lot tighter on what flash they will allow, and with the wireless workshop setups, the flash is fully downloaded and checked for integrity (checksum?) before the various modules (ECM/TCM/BCM/ABS/ECBM etc) execute the actual flash. He wasn't sure whether this was done by the individual modules i.e. E38stores old and new image at the same time, or handled by the BCM. Also the BCM tells all the modules (a dozen or more of them....) to shut up and be quiet while the downloading is done.

Cheers.

The ECM did have the proper speed info, but I don't have an instrument cluster that's on the CAN bus (yet) so I don't know if the factory speedo would have worked. The VSS is attached to the TCM in the 4L60e application too, so I'm guessing the message between the TCM and ECM is the same.

[XLR8NSS]

Just heard back from a friend with a 2wd '08 TBSS. He checked my stock files against his and there was no differences in the ECM or TCM files.

Seems like that opens this up to possibly using a '08 E67/T43/2wd OS then huh?

Anyone have a clue what other modules might have to be looked into if you change the O2 in the ecm/tcm to a different vehicle?

[gmh308]

Just heard back from a friend with a 2wd '08 TBSS. He checked my stock files against his and there was no differences in the ECM or TCM files.

Same OS and calibration part numbers?

That sounds like great news!