Chevy express twin turbo gear ratio and transmission

[Hendrik]

Hi

 

How can I find the gear ratio on my existing vehicle, based VIN. I asked GM and got no clear answer. I understand that the parts number is needed. The next problem is the front axle. It is from Borg Warner. Again no VIN based info. Please help if you know something.

 

1. I'm looking ZF transmission for GM LT 5.3 Express VAN AWD
The engine is custom with 600 hp
This also brings me to the next points.
2. Transfer case for 600 HP
3. Front differential 600 HP divided into two
4. Rear differential 600 HP divided into two
5. Driveshaft rear
6. Driveshafts in the front
7. I'm also looking for the engine  a new camshaft for a smooth street drive, but high torque in lower RPMs. Because the engine is a twin-turbo engine and the boost comes later.

Finally, I will purchase a ZF 8, 9, or 10 speed transmission for my vehicle.

Why I'm asking for ZF? Because it is a faster transmission, works very good with down shifting and does have more gears than Allison.  I also don't know any other transmission that works like the ZF. The ZF is working in Camaro, RAM, Range Rover, BMW, Audi and beyond very good.
Please offer what you have and know!

 

I appreciate every help!