Check your body mounts and your case mounts. I was pulling some heavy loads with my truck with a 203 and stated getting all sorts of noise that sounded just like the case eating itself. Well it turned out that the bolts for my skid plate had got up against the mounts that were ruined by ATF leak. The crossmember was acting like a speaker and transmitting the normal noise at many times louder than it would be if the mounts were isolating it like they are supose to. Pulled the bolts out that were touching the mount and quiet as can be unless under heavy load. Then the top of the case touches the floor pan. <IMG SRC="smilies/smile.gif" border="0"> My cab mounts are pretty hashed also hehe. Ordering new this week.Originally posted by frisbee:
<STRONG>How much noise should a NP205 make? and is there a way to make it quieter? It starts for the time I step on the gas and gets noisier the faster I go.....</STRONG>
No it doesn't. The 205 was used in ALL 1980 GM trucks. All the ones behind the autos came with ATF in them. That was the year they also had that shity slip-yoke set up. Very easy to change over though.The 205 uses gear oil no matter what tranny is in front of it.