Bonneville transmission question
I have a 2002 Bonneville with a straight 3800 (no supercharger) and 138,000 mi. It has a humming noise in the front end starting at 30mph and increasing in loudness up to and over 60mph. It sounded like it was coming from the left side so I checked the CV joints and found the inner joint to be loose. I replaced the entire drive axle including both CV joints. Still had noise. I checked the left front wheel bearing and found it had some play too. Replaced that and still have noise. I checked the right CV joints and their loose also.
My question is, I noticed when I pulled the drive axle out of the transmission on the left side, the splined shaft in the transmission was loose. It fell down and rested on the seal. I reached in and found it was very loose. I didn't know if this was normal or not. I went ahead and put the new drive axle on. There'* about 1/16 inch play at the inner CV joint housing. Is this normal? Doesn't seem to be any transmission oil coming out.
Not sure whether or not I should continue replacing drive line components or if the problem'* in the transmission. I'm not sure if the car'* worth major transmission work and therefore I'd be throwing money away replacing all the driveline components.
Does anyone know if the spline shaft in the transmission should be loose?