Vibration issues
How this all started was I changed rear gears to 3.73s 489 case that's when the vibration started I was using a combination u joint i probably wasnt using the right one I measured and may have been off my fault on that and on a test drive a u joint failed and the drive shaft came out at about 60 mph. I took it to a driveline shop and they put a new tube on it and used the same yokes at both ends. Yes they balanced it they welded a washer on the slip yoke side and put new u joints in
I then changed the pinion yoke on the differential to match the drive shaft.
It still vibrated. So I went back to the gears I had before the swap.
This vibration with the 489 case was worse and different. When you reached 40ish mph the vibration would shake the seats in the car it was that bad. It got worse when you hit the gas, less so when you let off. With the 3.73s in the 741 case, the vibration is almost the opposite: noticeable vibration at 50-60mph, getting worse with higher speed. The vibration gets worse when you let off. It also gets worse when going up a noticeable hill.
This picture is when I had the 3.73s in
How this all started was I changed rear gears to 3.73s 489 case that's when the vibration started I was using a combination u joint i probably wasnt using the right one I measured and may have been off my fault on that and on a test drive a u joint failed and the drive shaft came out at about 60 mph. I took it to a driveline shop and they put a new tube on it and used the same yokes at both ends. Yes they balanced it they welded a washer on the slip yoke side and put new u joints in
I then changed the pinion yoke on the differential to match the drive shaft.
It still vibrated. So I went back to the gears I had before the swap.
This vibration with the 489 case was worse and different. When you reached 40ish mph the vibration would shake the seats in the car it was that bad. It got worse when you hit the gas, less so when you let off. With the 3.73s in the 741 case, the vibration is almost the opposite: noticeable vibration at 50-60mph, getting worse with higher speed. The vibration gets worse when you let off. It also gets worse when going up a noticeable hill.
This picture is when I had the 3.73s in
