Hi, I have a 1992 Lexus SC400.
Im experiencing a strange vibration in the rear past 30 mph around 55 kmph.
Its a 5 speed swap, using an SR20 5 speed, custom driveshaft, and it has a 2002 GS430 3.27 rear diff, Toyota soarer rear subframe, clutch has about 25,000 km or 16,000 miles.
250,000 km about 155,000 miles on my car.
It started a few hours ago, I was driving and I had stopped at a light. Just as I put it in first gear and rolled forward I heard loud mechanical shake/popping noises from the back, (I was listening to loud music and still heard it, so it must have been really loud) I instantly pulled over and looked underneath, it was dark so I couldnt see much. I decided to continue driving it home, and again just as it started rolling the same noises this time with 3 distinct mechanical pops, the noises stopped once I hit about 5 mph. I rolled up to the next light, I expected to hear the same noises but they just vanished, no noises, absolutely nothing. I continued to drive slowly and it was driving just like it usually did, very very smooth. It did the same thing at the next few lights so I decided to drive a little faster. I reached 30 mph and it begins to vibrate very very strong vibration all over the car and I can feel it predominately from the rear. The vibration can be felt through the seat, the steering wheel, pedals.
My car made loud mechanical popping noises from the rear when i rolled from a stand still, they stopped. Now it vibrates all over especially from the rear starting at 30 mph.
I can tell its not the transmission, as it didnt feel any different and shifts absolutely fine in all gears. The car also steers fine. Theres also no leaks from anything.
I havent lifted the car yet, I will do so tomorrow. Does anyone have any ideas of what could be wrong? Has anyone experienced anything like this?
I find it really bizarre how the loud mechanical noises just started and vanished in such a short time. Maybe its the differential?