Hi, I've got a 99 GMC Suburban, 2500, 4WD, Vortec 7400, 100k miles, towin pkg, etc. I'm 95% sure it has a limited slip diff. The rear end is locking up all the time. It's very noticable around a tight corner. I made sure the 4wd is disengaged (checked the engaging actuator in the front axle) to elominate that as a problem. I changed the fluid - used the correct (very expensive) GM gear oil. Did not see anything out of the ordinary (broken pieces, etc.) in the housing. I have tried making "S" turns in reverse, forwards, backwards/forwards, driving in circles, etc to try to free up whatever is stuck. It refuses to release. Anybody have this problems, any ideas, please? It does not make any whining noises or vibrations, the only noticeable problem is that it is not doing the differential thing around corners. Help - I'm stumped
Thanks for the help. Dito on the intake manifold problem. It's also a problem on the big block engine.