TBSS 4L60e to 4L80e T42 Swap

[ScarabEpic22]

Run the factory TCM OS for the TBSS and change the pins either on the TCM side of the trans side. If you want to keep the TCC locked under 0% TPS, only works if you have an 06-07 TBSS. 08-09s dont work, Ive been working on a fix for the 08s since March and am still fighting some issues.

[Mike@Vengeance]

The 4L60E segment can run the 4L80E if the trans harness is modified...

basically:
- discard the 3-2 control solenoid signal,
- use a relay to invert the 2-3 shift solenoid signal,
- drive TCC PWM from TCC On/Off or from TCC PWM thru a relay gated by TCC On/Off;

( those changes a simple )

If you swap in a 4L80E segment you still have to modify the trans harness (TCC PWM pin has to be moved).

more info:[/QUOTE]


Okay did the Relay and got everything else wired up. This is the program I am running. The truck still does not shift right but all the other issues are fixed. Does anybody else have any ideas. Apparently this swap is a pain from everything I have found but I know it can be done.

Thanks so much

[joecar]

Do you get any DTC's...?

Log the various TSTATExx pids, they may reveal some more context.

[joecar]

Attachment 14224


Okay did the Relay and got everything else wired up. This is the program I am running. The truck still does not shift right but all the other issues are fixed. Does anybody else have any ideas. Apparently this swap is a pain from everything I have found but I know it can be done.

Thanks so much

As a sanity check, explain in detail exactly what you did.



What happens when it tries to shift...?

[joecar]

From DVT in the scantool can you command the shift solenoids on and off...?

[ScarabEpic22]

Does it slam into gear when you shift from P -> D?

Does it hang past where it should be shifting (ex shifting at 30mph vs 25)?

Looking through that tune it appears everything is set correctly, but I havent personally done the swap so I might have missed something.

[Mike@Vengeance]

Wiring

Took Pin S out of botom of Trans Harness

Took the Wire out of PIN T and put it in PIN S

Went to TCM and Took 2-3 Noid and ran it to a relay so when the computer is commanding it OFF it is ON



After going back over the RELAY install I believe we have it working. It does shift 1-2-3-4. I have not been to able to fine tune it yet because of a small oil leak.

The only other issue I am have is the Traction Control/Stablitrac Light will flash on and off randomly and affect the truck. If I turn it off I can drive it but I probably only have about 1 mile on it.

I'll keep you guys updated and when I know everything is up and running good I will post the T42 tune to share with everybody and all the other info I have on the swap.

Thanks agian

[Mike@Vengeance]

Update #2

Okay I have had sometime to play with Trans Tune and it WORKS!!! Drives great and Locks up with no issues.

I still need to figure out a few minor details.

Thanks to Joecar and everybody who helped out with this one. Can not thank you enough.

[ScarabEpic22]

Glad you got it sorted out, just needs a little massaging once you get the basics done!

[joecar]

Cool good job.