ChronicRage

I spent the better part of today reading a **** ton of threads today on this transmission but I never saw this mentioned. I originally had a LQ9 4L65E eye'd up to swap into my Wrangler but this A6 would really broaden the versatility of my rig.

I assume like damn near every auto these days this thing has a tow / haul mode as well? Also if this feature is present (which I'm assuming it is) does it lock out both overdrives? Or just one and the converter or something entirely different?

Thanks for your time.

Bo185

I have used the tow/haul in a Chevy truck , borrowed my uncles truck, while pulling a car and I hated it! Unless you loaded very heavy ie if you use the Tow/Haul while not hauling anything the downshifts were very violent at best! IIR it locks out 6th as well. But not sure.

If you do a 6l80 swap I wouldn't worry about it. With out looking at a wiring print, I am sure it routes the T?H function trough the damn BCM like the TUTD function!

ChronicRage

fwiw John over at Speartech informed me this feature was handled thru the body module and was a huge bummer to deal with. Such is life LOL.

poorhousenext

BO,

No reason to be mad.

Tap up/Tap down feature does not need BCM to function. You will need to load Corvette Shift program in TCM to do it.

John Spear (SpearTech) did this on his 6L80E truck testbed build using momentary contact switch. Later on he converted TU/TD shifter out of a caddy to do it with corvette program for another customer.

John converted a G8 TU/TD shifter back in 2008 so I could manual shift my 66 Midyear. NO BCM used.



You can PU/PD with paddles shifters from aftermarket vendors of them.

Check 6L90E does go in Camaro build in Hybrid/Conversion forum. He was using switches, and working on building his on paddle shifter for build.

TrueBlueGTO

Tow mode is simply a pre-programmed algorithm for the TCM to hold gears longer to keep the engine in the power band. A good tuner can simply make that adjustment in your base tune to identify when the motor/truck is under a heavy load.

jpndave

Does anyone know what year 'vette programs work without the body module for tap up/down or do they all function that way?

Bo185

Any year used with the 6l80 trans will work. The trucks use the BCM.

jpndave

So just add the tap shift wire to the harness and flash in the 'vette program?

Bo185

Flash the TCM inside the trans correct.

jpndave

Thanks! Any particular year 'vette program better?

leesnuts

I thought the Trans program and ECM program had to match or there would be issues. I'm running a 2010 silverado 5.3L/6L80e combo. I have had a harness made but I was told I needed a BCM to use tap shifting. I have a caddy shifter with Taps I would like to use. Is there a way to make it work with this setup and no BCM? Thanks guys

forcd ind

iTrader: (7)

in my 2011 truck, the tow mode locks out 6th gear, holds shifts longer

Hart_Rod

iTrader: (3)

Is this true? What is required to "flash" a TCM?

lt1 sport

iTrader: (13)

On my 13 sierra 6.2/6l80 i like the tow haul feature for pulling, holds shifts longer, also downshifts to help braking. It will go into 6th but only above around 72mph. On my old 4spd trucks i had my tow haul as my "race mode" 0 torque management, reduced shift times etc. Now i believe on the E38 ECM there is Shift pattern a, b, c? Been a while since i looked at it in HPtuners, but i believe there is one pattern for having it in "D" and no " tow haul", "D" with tow haul on, and then one for each with the selector in "M" for manual mode. I know speartech has a tap up/down floor shifter for using the manual mode with 6l80/6l90 swaps, i am thinking about purchasing this for my L92/6l90 swap in my 92 c1500. Hope this gives you some insight.