Need Rebuilt Transmission 2001 Silverado

I have a Chevrolet Silverado Pick UP truck, it's a 2001 4.3L Gas 2WDQuestion:  The trans. is NV3500 5speed, it is running but have winding like all NV3500. I am trying to ID the trans, so I could order a rebuilt from Midwest. Sine it is a manual the front housing has the open holes where the hydra line goes inside to the slave cylinder. With whom can I talk to find out what would be the best option. I will bring the core to US to ship to Midwest. The noise it not on all the gears.Answer:  We can provide a rebuilt NV3500  gas manual 5 speed transmission, this transmission hasa one year warranty, order our part number MTGM007 your cost is $1133.00 plus a $350.00 core deposit plus freight.For more information or to place the order give Scott a call toll free 888-824-2012 he can help you.