I have a '98 S10 2WD 4 cylinder pickup. It has a five speed manual transmission, I believe it's the NV1500. There's a shudder in the top of the second gear power band, and all the way through third gear. Also, it clanks in the rear of the truck when I take off from a stop, and occasionally when up-shifting from one gear to the next. I have replaced the fluid, I used Royal Purple Synchromax. I topped off the fluid in the rear diff, and replaced the driveshaft center support bearing, which was rather worn out. The clutch needs bled, but I don't think that's the culprit. Is this possibly a worn out clutch issue, or more of a synchronizer problem? I will also be checking the brakes at my earliest convenience. Any advice/suggestion is welcome.