- Jul 25, 2003
- Franklin, TN
I have a 1991 Nissan 240SX w/ a five speed. The car is in surprisingly good shape for it's age, and I'm big on keeping up with the maintenaince on my vehicles. I wasn't experiencing any problems with shifting/grinding/clunking or anything, but decided since I recently bought the car and did not have any fluid change documentation that I should change out the fluid in the rear end and trans. I had some people suggest Royal Purple, some suggested Redline, and a few more suggested Mobil 1. The manual specifies 75w90 GL-4 rated gear lube. After doing some research I decided on Redline MT90 in the trans, and Redline 75w90 gear lube in the rear end. This just started after the fluid change: When the car is cold it will crunch on the 1-2 shift. Not a grinding sound, but a crunch that I can feel in the shifter slightly. This only happens for the first 5 minutes or so of driving, and then after that first period of time the 1-2 shift is fine, not even noticeably notchy. The other shifts are good, no crunching or notchy feeling. Also if I leave the shifter in neutral for an extra couple of seconds before putting it into second there is no crunch. Is this normal? Is this something that I need to worry about as in get that MT90 out ASAP? 192,000 miles on trans/rear end.......