Rear End "noise".
Thread Starter
Racer
Joined: Dec 2006
Posts: 417
Likes: 40
From: Swansea IL
Rear End "noise".
Ok, when replacing the rubber bushings in the rear of the car (diff, sway bar, strut rods) and reworking the brake calipers, I got this scathingly brilliant idea. There on my shelf was a complete 3:70 posi rear differential. Had run it once on my old race car.
Thought it might be fun to take the 3:08 diff out and put a little gear in the car for some around town fun.
Finished the job up today and I can say that it certainly changed the overalll feel of driving the car. First gear is pretty short now and the big thing I am noticing is that I can actually hear the rear gears under mild acceleration. Was wondering if this "Gear Noise" is common with lower gear ratios? I havn't driven this sort of thing for 15 years. You don't notice any noise when you are just cruising or coasting, just during mild throttle applications.
I understand that the pinion is turning a whole lot fast now along with the driveshaft and such. So is the increase in gear noise normal?
Thanks for your help.
Bob
Thought it might be fun to take the 3:08 diff out and put a little gear in the car for some around town fun.
Finished the job up today and I can say that it certainly changed the overalll feel of driving the car. First gear is pretty short now and the big thing I am noticing is that I can actually hear the rear gears under mild acceleration. Was wondering if this "Gear Noise" is common with lower gear ratios? I havn't driven this sort of thing for 15 years. You don't notice any noise when you are just cruising or coasting, just during mild throttle applications.
I understand that the pinion is turning a whole lot fast now along with the driveshaft and such. So is the increase in gear noise normal?
Thanks for your help.
Bob
Race Director
Joined: May 2005
Posts: 10,674
Likes: 122
From: Millington Illinois
St. Jude Donor '08-'09
Ok, when replacing the rubber bushings in the rear of the car (diff, sway bar, strut rods) and reworking the brake calipers, I got this scathingly brilliant idea. There on my shelf was a complete 3:70 posi rear differential. Had run it once on my old race car.
Thought it might be fun to take the 3:08 diff out and put a little gear in the car for some around town fun.
Finished the job up today and I can say that it certainly changed the overalll feel of driving the car. First gear is pretty short now and the big thing I am noticing is that I can actually hear the rear gears under mild acceleration. Was wondering if this "Gear Noise" is common with lower gear ratios? I havn't driven this sort of thing for 15 years. You don't notice any noise when you are just cruising or coasting, just during mild throttle applications.
I understand that the pinion is turning a whole lot fast now along with the driveshaft and such. So is the increase in gear noise normal?
Thanks for your help.
Bob
Thought it might be fun to take the 3:08 diff out and put a little gear in the car for some around town fun.
Finished the job up today and I can say that it certainly changed the overalll feel of driving the car. First gear is pretty short now and the big thing I am noticing is that I can actually hear the rear gears under mild acceleration. Was wondering if this "Gear Noise" is common with lower gear ratios? I havn't driven this sort of thing for 15 years. You don't notice any noise when you are just cruising or coasting, just during mild throttle applications.
I understand that the pinion is turning a whole lot fast now along with the driveshaft and such. So is the increase in gear noise normal?
Thanks for your help.
Bob
Last edited by 63mako; Feb 25, 2007 at 08:46 PM.
Tech Contributor
Joined: Aug 1999
Posts: 15,175
Likes: 3,986
From: Connecticut, USA
Not normal. If it's an old unit you may have a bearing noise but sounds like gears. Hard to tell without hearing but if you hear it loud enough without really listening for it then it will not go away.
