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Rear End Noise And Transmission Question?!?


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#1 BadBowTie98

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Posted 26 February 2011 - 01:19 AM

Ok, So i'm trying to figure out if this is just another GM quirk, or if there is something wrong. Problem one: when one wheel spins on the snow, (open diff, not a G80 code Posi rear) the side that doesn't spin sounds like it's trying to engage somehow, but doesnt, and makes a whirring/grinding sound. Not too loud, but definatly noticable, this normal for a non posi diff, or does this sound like something has gone Arye? Problem Two: when on the throttle more than 40%, the 1 into 2 shift change is verrrry sloopy.. like hesitates to click into 2nd gear. would a simple trans flush take care of this? or does this sound like a tranny problem? I just spent $4100 on a new motor, i'd hate to dump more into a trans. the truck only has 120000 miles. I just bought this thing like 6 weeks ago, I miss my 98 K1500 :thumbs: Any input would be great! thanx!
98 K1500 Vortec 350 5 Speed Manual
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#2 BadBowTie98

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Posted 28 February 2011 - 06:59 AM

So I figured out the tranny is normal. But I'm still in mid-thought about what the rear end noise is? bearings maybe?
98 K1500 Vortec 350 5 Speed Manual
Little Sound Clip
http://www.youtube.c...feature=channel

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#3 DaveV

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Posted 28 February 2011 - 08:57 AM

You shift with the throttle applied? Why?

Also, about the rear end, if only one wheel spins, the spider gears have to apply all the torque/speed to one wheel. These are flat cut gears, not helical, and are noisy.

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2008 Silverado 1500 Z71
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Borla cat back getting hacked up, adding XR-1 :D


#4 BadBowTie98

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Posted 28 February 2011 - 04:24 PM

well that's good atleast. sounds kinda normal I guess? How much of a pain would it be to put in a posi unit?
98 K1500 Vortec 350 5 Speed Manual
Little Sound Clip
http://www.youtube.c...feature=channel

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#5 DaveV

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Posted 28 February 2011 - 07:25 PM

Normal, yes. Good for it? No lol, spinning one wheel for any length of time can damage it.

Id assume you have to remove the ring/pinion, bolt on new differential, reinstall ring/pinion. Id recommend you let a shop take care of that. Install would probably be around 500+

A decent differential will be 500+

If the rear end has never been touched, id recommend all new bearings as well.

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2008 Silverado 1500 Z71
7.5" RC ▬ Toyo ▬ Edge ▬ Volant ▬ 4.88 Yukon
3" BL This coming week!!
Borla cat back getting hacked up, adding XR-1 :D





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