3rd member problem ??
This is a discussion on 3rd member problem ?? within the Drivetrain forums, part of the LSx Technical Help Section category; so i hears a loud humming from my rear end i put it on jack stands and rotated my back ...
11-18-2009, 01:48 PM #1
3rd member problem ??
so i hears a loud humming from my rear end i put it on jack stands and rotated my back wheels( by hand and i see the part right after the yokes on my driveshaft rubbing agianst my differential) and found out that what i believe is my 3rd member i want to be 100 % correct because i have never replaced a 3rd member before and i am wondering is my diffrential shot completly or can i buy a replacement for the stock diffrential 3rd member the pice that comes out of the differential and connects to the driveshaft i want to be sure im not saying the wrong part . any help would be greatly appreciated (any for other info i have replaced all the yokes on my driveshaft in the last 9 months rebuilt the differential 9 months ago and put 3.73's in)
Last edited by 402 Guru; 11-18-2009 at 02:19 PM.
11-18-2009, 02:02 PM #2
11-18-2009, 02:15 PM #3
Last edited by 402 Guru; 11-18-2009 at 02:29 PM.
11-18-2009, 02:59 PM #4
Well there's only a few options here. Your rear end is not broken yet. You said you had it rebuilt. Could be non OEM gears and those tend to whine/hum/ make some noise. So you can wait it out, take it easy on the car and hope it stays together for awhile. Or, you can buy yet another rebuild kit for this 10 bolt that will break again and try to fix this problem you have.
1. Ride it out, hope for the best.
2. Buy another rebuild kit, with zero promise of it curing the 10 bolts weak flaws
That's it. I would go with number 1 personally.
If your driveshaft yoke is somehow rubbing on the differential, that problem needs to be addressed.
Its hard to tell someone what to do with any kind of rebuild without being there to hear/see it.
Last edited by Hi-Po; 11-18-2009 at 03:03 PM. Reason: spelling
11-18-2009, 06:39 PM #5
Last edited by 402 Guru; 11-18-2009 at 06:43 PM.
11-18-2009, 06:46 PM #6
If you can swing it, start checking the forums for used 12 bolts or 9".
Also, that part is the differential yoke. Really IMO, 9" have 3 members. 12 bolts, 10 bolts etc have a center section. I call it a 3rd membr when you can take the entire piece out all in one grab.
11-18-2009, 07:02 PM #7
Last edited by 402 Guru; 11-18-2009 at 07:06 PM.
11-18-2009, 07:15 PM #8
11-18-2009, 07:16 PM #9
Last edited by 402 Guru; 11-18-2009 at 07:18 PM. Reason: spelling
11-18-2009, 08:03 PM #10
Yes, It will make all kind of noise.
My 12 bolt blew because the dumb ass that put it together didnt Loctite thee bolts and 4 backed of the ring gear while I was at the top of 3rd gear. That was fun and awfully noisy No stocker here. I only have one rear end, and thats my 9". Thank god. I sold my 12 bolt to a local guy for cheap.370 CI - Twin 6766 Turbo - Jakes stage 5 4L80E - MWC 9" - Holley Dominator
Build in progress...
11-22-2009, 07:16 PM #11
From everything you have said it sounds like the pinion nut backed off. drop the drive shaft at the rear and pull the rear cover off and see how much slack you have in that pinion.
11-22-2009, 08:18 PM #12
11-26-2009, 07:12 PM #13
Good luck with it. You should be able to get the parts from lots of places. Check sponsor sites.
12-01-2009, 07:40 PM #14
Thanks i just got the rear end back after taking it out 2 days ago ( a complete rebuild with a new ring and pinion since i had track only gears in from my cars seasons as a Drag Race only car . I am so Happy im trying to drink hot coco to get some sleep but i can't stop thinking about getting my 402 back on the road .i cant wait to get this in in the morning
12-01-2009, 08:10 PM #15
so i've always had my pinion angle at -4 but 1 thing before i bolt everything up in the morning i have hotchkis lca's and i cant remember were to put The bolt in in the top hole or the bottom hole damit ...
12-01-2009, 10:56 PM #16
Well I cant help you there. but soon enough I will be getting into that section of mine. Haven't had time to read up on it as of late. Maybe after Christmas. someone might pipe in here and know.
12-01-2009, 11:03 PM #17
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