np203 ??

[us111]

hi all,,in the middle of changing my th350 tranny that gave out on me,,just got it all put together and it went out so now have it all laying on floor,,first question is does the np203 take 10w30 or 10w40??? not familar with t-case's so wanna drain it and replace while out,,,also 2nd ?,,when i put it all together first time where the speedo cable screwed onto the t-case the threads that the speedo cable screw onto kept spinning so you could not tighten up the cable,,,i took the part off of t-case (big nut) looked all inside of it couldnt figure out why it was doing this..when i drove it first time (before tranny went out) the speedo was not working so would like to fix while it's all out on ground...hope this make's some kinda sense to someone,,,lol....thank's for any help...