Dave Risco here from Transstar, the technical product specialist. And today I want to talk about pumps and converter hubs. Mainly in the pump of what centers the hubs. Anybody been doing transmissions for a while now there's many types of converter hubs, whether you have slots in it for a lug type gear, whether you have flats for a milled flat gear, in the case of the 6R140 it's a splined gear. So there's all kinds of different hubs. What's the main difference between all the hubs? You have two different ways of centering the hub. The most common way is with a bushing. Lately, and even some older Honda's you would remember more from, they have bearings. Now in between each needle is more room for oil to get out. If oil can get out and a drain back hole ain't big enough, pop goes to seal. But obviously if they use the bearing they've designed to pump to counter that. So why do I want to mention this? Well in Mercedes you can have a bearing pump or you can have a bushing pump. If you pull out a bushing pump and put in a bearing pump you have to make sure that the converter hub will work on the bearing and why do I say that? Well if you're using a bushing it's not a real hardened material and again all converter hubs are hardened to a point. But now if you put a bearing in this hub becomes a bearing race. Don't care what anybody else says if you're using a bearing this becomes a bearing race. And why is that important? If you use the same converter out of a bushing pump in a bearing. I don't know how long it's going to take to fail but it's going to fail again because you're using a softened bearing race. And again if you want to jump on Sonic's website and go to Mercedes in the converter section they list two different hubs for the Mercedes. One of the hubs that says use with bearing or bushing. Really don't matter if it's hard going in a bushing although could too hard take the bushing out? Possibly could but I don't think that's a factor. The other one they sell is bushing style only. Why? Because it is not properly hardened to run against a bearing. So guys when you're flip flopping in pump stick could have either or be careful. Some of the six speeds in forwards and ZF have bushing bearing and again if you flip flop you could catch yourself and have a warranty issue. So again wherever you're doing make sure you have the proper hub for whatever it's riding on. Again if it's a bearing and that's all they have is bearing trust me everything you get to hard and hub. But if it's something where you can flip flop them around please make sure you have the right hub check with your converter manufacturer, your sales person and save yourself some grief down the road. Again my name is Dave Ritzko. You can reach out to us at transson.us, transstar1.com or as always contact your sales rep. Thank you for watching.