New to this forum, refered to by another. OK I'm waiting on my 05 GM 2500HD w/ duramax and allison. I am wanting to lift it with CST 9to 11" with 37" tires.
I am very confused on what I need to do to take care of my tranny and such. I want to add performance but have heard so much about so many options.
what I basically want is to calibrate eveything for the larger tires and maybe some added power too.
Do I change gears right away?
Do I reprogram? will this require trans upgrades?
Do I need a locker? one person said 456 gears and a locker is all I need?
What would you guys do if it were your project? only a couple grand at most to spare. thanks.CB

Gears would be a good choice on that big of tire. Also a Predator to change the calibrations for the gears and tires. That will get your speedo back in check and add some power. Not much choices on good aftermarket lockers that I know of at this time for the 11.5" axle but others may know of one

My tires measure out to almost 37" and I'm going with a set of 4.56's

Do I need a locker? To be honest this is all a learning experiance for me I don't even know what a locker will do for me. I've just been readin and listening to you guys. CB

You can use the one that is in your truck already and save money.. A trip across state and you can get it all installed too!

No one makes a true locker for our trucks yet. Tractech is working on a full Detriot No-Spin,but it won't be available until the middle of this year at the earliest. Another option we've talked about is using the Dodge 3/4-1 ton rear limited slip,same axle,just have to check the spline count and some other small details.IMO the stock GM G80(Gov-Lok) option is a waste of money,broke mine in less than 10,000 miles. Granted I beat on the truck pretty good ot still shouldn't have failed that soon.As for the gear,I would do it as soon as you can afford it. A gear swap made a huge difference,performance and mileage wise to my truck.

You can use the one that is in your truck already and save money.. A trip across state and you can get it all installed too!

When, where and how much of my stuff can you do? My truck just came today!!! let the mods begin!!!

When- when your ready
How much- All
Where- At my shop in Zeeland ( SW of GR about 20 min)