Kerplunk...

by Roadcaptain S3 Wed Jul 13, 2011 9:34 am

For those of you who have switched to, or are thinking about a 9C1/Imp SS rear end...
This is what they look like if they come apart.
Kerplunk... Gears11

Sorry for the crappy phone pic, but if you look close, you can see one gear in two pieces, and the other with several missing teeth.

All fixed and back on the road, but I had an interesting day or two this week.

by JB2wheeler Wed Jul 13, 2011 10:13 am

Hmmm...you must have driven the Impala pretty hard, yes? JB

by Roadcaptain S3 Wed Jul 13, 2011 10:22 am

Negative, Just cruising along on New Cut @ Outer Loop Friday. About 45 mph and PHOOEEY!

I'm quite sure the guy I bought it from last year rode it pretty hard before his Dad took it back from him.

The rear end was the only thing left that the dad hadn't rebuilt.

by The Dude Wed Jul 13, 2011 11:47 am

I take it you had the Gov-lock rear? Been there before too. Coming home in my truck & all of the sudden I heard a whining noise. Before I could slow down to a stop.... KABOOOOM! It shattered everything inside & blew some pieces through the front of the diff rendering the entire unit useless. I prefer open rear ends if they are factory just because of that. Hard driving has nothing to do with it IMHO. I think it has to do more with poor craftsmanship & previous owners failing to change out the fluids on a regular basis.

by jerry46765 Wed Jul 13, 2011 3:00 pm

Cross pin broke in three pieces? Once that happens, it spits the contents out like a thrashing machine.

I just threw out a bunch of broken and worn carrier assemblies. Typically the cross pin will get wear from worn spider gears (wear on gear teeth) and there will be enough slop on the gear/pin that it will bind breaking one or both gears riding on the pin.

But breaking the cross pin into three pieces isn't common. I would bet heavy wear from both spider gears on the pin and maybe the cross pin retaining bolt was broken allowing the pin to move around in the carrier.

Oh the memories...

by Roadcaptain S3 Thu Jul 14, 2011 9:33 am

I'm guessing that there was a nasty crack in there somewhere, but when I bought the car, all I did was check the fluid.

I've never had one go that hard just cruising down the road, or even heard of it for that matter. I actually thought somebody had hit my car for the few seconds it took to figure out noone was anywhere near me.

by 74chick Fri Jul 15, 2011 3:35 am

That makes me wonder about my Roadmaster.

I've seen that with governed posi's but never clutch posi's.

by Jim_Rockford Mon Aug 15, 2011 8:52 am

Impala's and 9C1's got the crappy A$$ cone type alburns none got govlocs those are only in trucks. If yours had one, it was installed from something else.

by dragons_lair59 Wed Aug 17, 2011 9:12 pm

hey guys putting my 91 caprice up for sale 700 and it has 3.08 posi 305 has a no start condition right now wifey says gotta go she wand older wagon has new pump filter and icm
Kerplunk... 031