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Noise coming from transaxle

Tiny
LMATOCHA1
  • MEMBER
  • 1998 PONTIAC SUNFIRE
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 161,000 MILES
I got a 1998 Pontiac Sunfire and got a loud grinding noise what appears to be coming from the transaxle on the passenger side of the vehicle. This noise is real evident as you are loading up the transmission and shifting through the 4 speed automatic transmission. It will smooth out once you get up to cruising speed. I've changed out the right side CV shaft assembly, the right hub assembly and replaced the bearing on the strut mount over on the right side. I'm at the end of the road with this issue. I sure could use some help. Also, the noise is even more evident when you have a passenger over in the right side seat. Sounds crazy doesn't it?
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Tuesday, January 18th, 2011 AT 6:46 PM

4 Replies

Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
If you turn the steering wheel to the left or the right while driving to make a lane change does the noise get louder or quieter?Also have you checked to see if maybe you have a bad wheel bearing since it sound's like it's coming from that right side?
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Tuesday, January 18th, 2011 AT 8:48 PM
Tiny
LMATOCHA1
  • MEMBER
  • 2 POSTS
There is no distinct difference in the noise when turning either to the left or the right. As far as the wheel bearing, I've already replaced the right front hub assembly that includes the wheel bearing that is in question. What could have I jeopardized in the transaxle if the transmission was run low on transmission fluid? This car doesn't have a dipstick to monitor the fluid level in the transmission and I do know that I had a leak on the pan and I corrected this problem this past weekend. When dropping the pan last week to service the tranny, the fluid didn't appear to look bad in color and didn't smell burnt. Still need some help!
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Tuesday, January 18th, 2011 AT 9:20 PM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
Did the fluid have any shinny stuff in it?Was it bright red dark red etc?If you press down on the gas does the noise get worse at freeway speed's and quiet down some when letting off the gas?If you did run it low on fluid then you could have damaged a lot of different thing's in the tranny if the fluid was low enough. Have you checked the left front wheel bearing as well?
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Tuesday, January 18th, 2011 AT 11:13 PM
Tiny
COURT_MAC4
  • MEMBER
  • 7 POSTS
Wondering if you ever found the problem with the grinding noise coming from the trans axle. I have the very same problem. Thanks.
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Saturday, October 11th, 2014 AT 10:27 PM

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