It does sound like a bit of speedo drive in there, you should be able to get it out with an oil change (the gearbox not the engine

)
the speedo drive thingy should be quite tightly held onto the cable but there's no clips or anything that I'm aware of, you just shove it on there till you hear/feel it click into place

you've got to be really careful that red thing doesn't fall into the box, I had that happen and the gearbox had to be taken apart to get it out

sure... I got a re-con gearbox out of it, but I'd have rather gone without that extra little expense
