gearbox change from 5 speed auto to 6 speed auto

[stevesnow]

does anyone know if this can be done or has anyone done a swap from a 2007 5 speed auto box to a later model 6 speed auto box and if so what is involved in the job .people have mention on here to change box to a manual box but i dont really want to do that .thanks steve

 

[Fu Manchu]

It is unbelievably difficult.

 

[vr304]

I believe there’s a shop called gc cars that do v6 to v8 conversions etc perhaps you could get in contact with them as they’d be able to tell you either way if it’s doable without blowing the budget

 

[Skylarking]

TLDR, I don’t know if the following will answer your question so best to have a squizzy at the following thread…

https://forums.justcommodores.com.au/threads/ve-5-speed-auto-to-6-speed-auto-conversion.285636/

Also wasn't a 5 speed to 6 speed auto conversion done and discussed in some VZ SS crewman thread (which I can’t find) but the following may also be interesting reads.

Pre VE 6 Speed Auto Conversion

Been thinking for a while about converting my VZ SS Crewman from the 4L65 to a 6L80 or 6L90 6 Speed Auto. In my view it is probably one of the biggest technological gaps between the VT-VZ platform and the VE/VF. Has anybody converted a VT-VZ V8 to a 6 Speed Auto before? Can it be done?

forums.justcommodores.com.au

https://forums.justcommodores.com.au/threads/cross-trac-6-speed-manual-conversion.304877/

6L80E and 6L90E into Holden CrossTrac system

Starting this thread out of my Cross 8 Thread *will need some mod help to move posts into what will be an incredible thread. Also including threads relating to 6L80 etc into pre VE Commodores, Manual 6 spd into CrossTrac systems. This will also have uses for the US and European market where...

forums.justcommodores.com.au

Should at least give your some food for thought…

 

[J_D 2.0]

does anyone know if this can be done or has anyone done a swap from a 2007 5 speed auto box to a later model 6 speed auto box and if so what is involved in the job .people have mention on here to change box to a manual box but i dont really want to do that .thanks steve

The problem is that the 5L40E box has the transmission control module inside the car (up under the dash IIRC) whereas the 6L50E has the transmission control module inside the transmission itself. In my estimation that is very difficult to overcome without a complete wiring harness from a donor car with a 6 speed auto.

The general consensus seems to be that it would be easier to convert the car to a manual than to convert it from a 5 speed to 6 speed auto., not least because manual conversions have been done before and would require less wiring. I never went ahead with any kind of conversion on my old SV6 and just bought a manual SSV instead!

 

[VYCommodore76]

Hardly seems worth it for an extra ratio?

 

[losh1971]

Hardly seems worth it for an extra ratio?

The problem is there are no 5 speeds in good condition left to buy and rebuilding one well is a dark art and more expensive than building 4 speed and 6 speeds.

 

[VYCommodore76]

The problem is there are no 5 speeds in good condition left to buy and rebuilding one well is a dark art and more expensive than building 4 speed and 6 speeds.

ah right, that makes more sense

 

[Fu Manchu]

Correct. It becomes a rabbit hole very quickly.

In regard to the VZ, that is entirely different. It’s far easier. There are adaptor modules that allow it to work.

 

[blackvxss]

does anyone know if this can be done or has anyone done a swap from a 2007 5 speed auto box to a later model 6 speed auto box and if so what is involved in the job .people have mention on here to change box to a manual box but i dont really want to do that .thanks steve

Ive heard people have done the later LFX/LLT motor a 6speed auto conversion to early VE involves and donor car with all the wiring mounts fuel system etc. Very time consuming