Transfer Case Question

[Schemmer]

I posted this in the engine and drivetrain thread but I figured this would get a few more eyes on my question. I’m significantly increasing the horsepower on my 4wd Yukon and want to keep it 4wd. So, I need some advise on transfer cases. I have a 2003 Yukon with the 5.3L flex fuel motor, 4L60E, 3.73 positrac rearend, and NP 246 transfer case. I always run E-85. So far I’ve converted to an e-fan, k&n intake, pacesetter 1 7/8” long tube headers and y-pipe, and all the components needed for a bigger cam. I’m going to be putting a Texas Speed Stage 4 5.3 Truck Cam 223/226 .600"/.600" 111 LSA with a Yank Truck Thruster Series 2600 torque converter, a built 4L65E, Magnaflow 15666 catback exhaust, TBSS intake conversion with 42 lb/hr injectors and 09 corvette TB. I don’t know exactly how much hp I’ll be producing but I’m fairly certain my stock transfer case won’t be able to handle it. Is there an upgrade kit I can get or do I need to swap it for a stronger one? If I need a stronger one, what should I get?

 

[Schemmer]

Also, I have plans for a 408 stroker build to replace the 5.3 that are finally coming together. So I will need something that could handle about 600 hp.

 

[randeez]

beat it till it breaks.
i dont know much about that transfer case, or any really but they usually arent the gm weak link so long as you arent doing 4x launches and trying to jam it back in 2wd wide open.
trans will prob let go long before.

 

[drakon543]

https://spprecision.com/products/np...MIs8H3scu24gIV0YKzCh3kggGFEAQYAiABEgJfYvD_BwE

i checked out atlas transfer cases also which depending on the site your on can be customized for your application. ball park estimate for you as it has specific gm selections is 3600 on the one site i was on. i could have went a little overboard but meh just do google 2003 yukon atlas transfer case