REAR Differential ?s

[adamdiego]

So I have a 6 speed 17 GT, and it looks like my rear differential is going out. Am I better off doing a rebuild, or ordering a used 3.31 Rear differential and plugging it in? And also wondering if I could swap a different rear differential size and still work ? Thanks

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[Mikepol2]

If you could find a performance package diff with 3.73's you'd notice better acceleration. I believe the drive shaft flange is different between manuals and automatics so keep that in mind. The transmission ratios on the 15-17's are closer than the 18+ so I wouldn't go with 4.09's.

 

[SnowFox]

Buy the housing already pre-loaded. Used or new. Easiest way, probably cheaper as well or at least close enough.

 

[TXGTPig]

What makes you think the differential is failing?

 

[adamdiego]

What makes you think the differential is failing?

Super loud humming , I lifted it, tugged the wheels to check wheel bearings, my guy who does my car work told me that’s what he thought

 

[Adam the Lighting Guy]

Diferential noise is something I'm too familiar with. But, what struck me recently as new and kinda odd was wheel bearings making noise. My work car (20' eb coupe, A10) was humming right along going straight and in right turns. The humming disappeared in left turns. Seems pretty obvious right? That was until I jacked up.the ass end and checked for play. There wasn't ANY play what so ever. This led me to think it might be front wheel bearings. I was not able to locate the position of the source of humming. Front, rear, left or right. It ended up being the rears.

Dif noise is not as pronounced in my experience. Throttle on noise, throttle off noise, noise right in between acceleration and deceleration. Noise in turns only. All different symptoms with different issues but not always.

 

[Eyesac]

Second the notion to check a rear wheel bearing, and agree that with the wheel end still intact there seems to be no play on a bad bearing on these cars. Seems like you have to take a caliper off for it to be obvious.

 

[TXGTPig]

Super loud humming , I lifted it, tugged the wheels to check wheel bearings, my guy who does my car work told me that’s what he thought

Have you checked the fluid level? I'm assuming the humming is at highway speeds? Any shaking or shuddering? Vibration in the seat?

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