[ScottyKnows]

Switching from the stock rear end to a 8.8 axle with 4.10's and t-lock. Is an ecu flash required?

[Smokey88]

yes you must reflash the ecu for the gear changes you have made

[ScottyKnows]

How does that work? I'm getting an xcal2 tuner with my c&l intake i have on order, can I use that with just the tuner file provided?

[ScottyKnows]

I've never messed with a tuner, so I have no clue how this works.

[Smokey88]

yes when you are first programing the car you go step by step through the process and it will ask gear size, you simply select 4.10 and whalaa your done.

[05horse]

when you first plug it in youll be asked to program vehicle

select yes

install tune by "skipping " options
put tune in.

when your all done hit program again, load the same tune

then it will say change options or skip

select change

then go to gear ratio, select 4.10 then save

the second flash takes only seconds the first a few minutes.

if your tires are larger than stock, besure to change your tire diamater the same way

[sixers007h]

Actually it is not required. If you switch out the gears and don't update your tune, the only problem will be your speedo will be off. Since your getting the xcal 2, you will be able to simply enter the new gear size under options, and your set. Not a hard task at all. Let us know how you like the new gears.

[stlwagon]

Originally Posted by 05horse

when you first plug it in youll be asked to program vehicle

select yes

install tune by "skipping " options
put tune in.

when your all done hit program again, load the same tune

then it will say change options or skip

select change

then go to gear ratio, select 4.10 then save

the second flash takes only seconds the first a few minutes.

if your tires are larger than stock, besure to change your tire diamater the same way

Why would you flash the tune twice? Make the change the first time and flash the car.

[05horse]

for the very first tune. u gotta put the custom/preloaded tune in first then change the gear dont you?

meh maybe not! but thats how i did it

[sixers007h]

Originally Posted by 05horse

for the very first tune. u gotta put the custom/preloaded tune in first then change the gear dont you?

meh maybe not! but thats how i did it

I don't think you have to, I know on the xcal 3 you can change options before any upload.

[stlwagon]

Originally Posted by 05horse

for the very first tune. u gotta put the custom/preloaded tune in first then change the gear dont you?

meh maybe not! but thats how i did it

Nope, you can make the changes before that very first flash.

[05horse]

nifty.

thanks alot, not like it matters to me now, but it will save him 5 minutes.

im still exploreing mine.

[ScottyKnows]

Ty for the helpful info guys. I'll be going from nearly stock to 8.8 axle 4.10s t-lok cai tune and gt takeoffs. The change should be immense I'll be sure to let you all know how it feels. . Thx again!

[05horse]

yep! have fun!