I've talked about doing this for a while, and am finally getting around to putting an overdrive transmission in my truck. I know there have been a number of NV4500 swaps done over the years, and I really didn't want to start a whole new thread about this, but I couldn't find my specific scenario described. So here is yet another NV4500 swap thread. After I make this post, I may come back and tag some of the folks who I know have done this swap. I know a couple guys are actually working their way through it right now. Anyway, let's get on with it... Pertinent Background Info: 1990 GMC 2500 Suburban 454 / SM465 / NP205 Hydraulic pedal assembly, bellhousing, clutch kit, master cylinder, external slave cylinder and clutch fork (driver's side of bellhousing) from 1985 K30 I picked up a low(ish) mileage NV4500 that was pulled from a 2001 Silverado 2500HD. I have the original bellhousing, clutch kit and internal slave cylinder/release bearing assembly that came from that truck. *Note: the slave cylinder opening is also on the driver's side of the bellhousing.* I do not have the master cylinder or pedal assembly from that truck. I figured I'd be able to use my existing pedal assembly and clutch master cylinder. While setting all my parts out this weekend I realized that the hydraulic hose for the internal slave cylinder has a large fitting that looks to be some sort of quick-connect style connection that goes to the master cylinder. This does not appear to be compatible with my existing clutch master cylinder. So I started looking into getting a master cylinder from a 2001 2500HD. Well the pushrod connection to the clutch pedal is different than my existing pushrod and pedal connection. So, my initial questions are as follows (depending on the responses, I will likely have follow-up questions): 1. Is there an easy way to adapt a 1996+ style NV4500 internal slave cylinder to my existing SM465 master cylinder? 2. Is the SM465 master cylinder going to move the volume of fluid needed for the NV4500 slave cylinder? 3. Is my existing SM465 clutch kit (disc and pressure plate) and pilot bearing going to work with the 2001 NV4500 input and slave cylinder/release bearing? I know there are options for retrofit external slave cylinders, different bellhousing options, etc. I would like to use as many of the parts that I already have, and minimize the amount of money I have to spend on retrofit components. I would also prefer to use my existing clutch kit, as it is a relatively new Ram Clutch kit, versus going with the clutch kit from the donor Silverado. Lastly, no, I have not pulled the SM465 out yet, so I'm not able to set the transmissions or clutches next to each other and compare. I can get some pictures of the NV4500 components if that helps. But I know there is a wealth of knowledge floating around on this site. So hopefully someone can point me in the right direction.