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June 30th, 2008, 03:30 PM
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Look what I found in my rear end!
 WTF could have caused this??? The frickin factory magnet came off the cover and got destroyed inside the posi unit, main gear, and spider gear. Some of the teeth on said gears are now chewed up. The fluid didn't look too good either (lots of grey material). This is my stock 120k+ mile factory rear end with just 28-spline axles upgrades. Has this happened to anyone before? Now I'm looking at getting an Eaton unit and new gears. I'm going to stick with the 3.42's. Problem is, I've never done rear end work before. How involved is changing all this stuff out? The car is on jack stands right now so there's no way I can bring it to a shop. Is there any information or step by step instructions on what to do here?
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 -Don 87 GN 11.07 @ 125 mph (old combo w/ PT67 DBB, GN1 heads, 120k mile stock shortblock, ended up splitting block  )Now running a 44k original mile stock longblock, stock turbo (for now), PTE FMIC, 60 lb inj, TT chip, TA Perf 3" DP, GNX style VDO dash, Vince Janis built 200-4R w/ 10" 3400 n-l stall (can you say NO turbo lag? LOL) Words of experience: Going fast was nice, but when your car is down every single year because you broke something, it isn't fun anymore and unless money grows on trees at your house, you don't regret going back to stock, and being able to drive and enjoy your car again 
    
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June 30th, 2008, 04:44 PM
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Are you sure something else didn't break and knock the magnet off the cover?
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1987 GN, 2-1984 Hurst Oldsmobiles - one with 1987 GN drivetrain, the other soon to be.
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June 30th, 2008, 04:56 PM
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Quote:
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June 30th, 2008, 06:25 PM
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Glue holding the magnet failed and the chunk was more attractive??? I dunno ...maybe
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USAF POWER PRO 87GN- GT3255E, Turbosaver, Razors PAC Alky, ESP FMIC, 3" THDP, TA Headers, 3"ATR Crossflow, TT chip, 38's, Pats 3k stall, QA1 r's front, UMI rear Ups(adj) & Lows, HR Bar. 03' G35 Coupe 5At, Blk on Blk, Leather, 18's, Prem pkg, Bose, JDM clears....wifes car 05' Harleys Wide Glide- Glacier White Pearl w/ EFI, Stage 1 & SE Pro Pipe. Duece- Sunglo and Chopper Blue w/ EFI, Stage 1 & SE Double Barrel.
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June 30th, 2008, 06:34 PM
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You need a TA Performance Girdle on that Punkin....
are your axles and posi unit for sale??? Going to BPG????????
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1987 GN 235ci, forged pistons,steel main caps,ARP everything Crank & rods ground smooth and shot peened,Balanced 50/50,restriced cam bearings, high flow centre main oil galleys. high flow front cover, race ported big valve heads,speedpro 204/214 cam, PT70 Ptrim , 72 lb siemans injectors, extender extreme alky chip, 4" intake, LS1 Maf. Tranlator plus. ported throttlebody,Mease plenum, EGR delete race ported and welded intake. port matched to felpro 1200s, SMC alky , ESP Front mount, F body rad, TA girdle on the Diff, Atr bar, Boxed control arms, Stock ported headers and THDP, Blaa blaa blaa Quote:
www.boostedwhips.com (Help Wanted, apply within) 
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June 30th, 2008, 09:30 PM
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Man, I thought you were going to say you found some $$$ in there
 well it's a good reason to go with an Eaton, and TA cover now.
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87 Black/Chrome TurboT- "109" .30 over, 4 Billet caps, Eagle crank, Eagle Rods, J&E pistons, 218/218 cam, Internal Balanced,All ARP bolts,JW Flywheel, HR mounts, Ported Intake, Ported Heads, PTE Plenum, 70mm TB, PP, 120lb Inj.,External Reg. Weldon 2015 pump, BIG STUFF 3, Little 67 Turbo, 3" THDP, PTE FMIC, Be Cool Rad. , 9.5 Vigilante NL converter, ATR Exhaust, Upper/Lower Metcos, H&R Bar, 3" Aluminum Drive Shaft, SSBC Brakes, Slotted rotors, Moser Axles, Eibach Springs.Weld Pro Stars, Alot of Chrome and other stuff. Running on 100% E85. 29lbs boost/ no Knock
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June 30th, 2008, 09:45 PM
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I had to rebuild the rear end in my GN twice...one at only 60,000 miles and again at 120,000. It's still sounds ok at 195,000 so maybe that's a good sign it was done right the last time.
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 Turbocharged - Intercooled Buick V6 Sequential Dual Fuel Injection - 3800 "Fast Start" Ignition System - Internal Gerotor Oil Pump
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June 30th, 2008, 10:46 PM
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I already have a TA cover and was going to put that on after I swapped out studs on my axles but I found this instead! So now I gotta spend way more money than originally thought. Gee go figure that one.
__________________
-Don 87 GN 11.07 @ 125 mph (old combo w/ PT67 DBB, GN1 heads, 120k mile stock shortblock, ended up splitting block )Now running a 44k original mile stock longblock, stock turbo (for now), PTE FMIC, 60 lb inj, TT chip, TA Perf 3" DP, GNX style VDO dash, Vince Janis built 200-4R w/ 10" 3400 n-l stall (can you say NO turbo lag? LOL) Words of experience: Going fast was nice, but when your car is down every single year because you broke something, it isn't fun anymore and unless money grows on trees at your house, you don't regret going back to stock, and being able to drive and enjoy your car again
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June 30th, 2008, 10:53 PM
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I've seen that before. Don't remember what it was on, but my guess at the time was that someone installed the magnet too high on the cover. Eventually it either slid down slowly or fell off into the gears. It tore the hell out of the whole rear end, as the magnet chunks stuck to every tooth and bearing roller. If you haven't ever done any rear end work, your best bet is to remove the whole rear end and take it to a reputable shop to get it set up. OR, you can do some research and have someone else who's been there before help you with it. It is pretty tricky though, I've heard a lot of noisy rear ends that were supposedly built by a "gooroo". Hope this helps.
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87 GN
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June 30th, 2008, 11:43 PM
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+1 with the post above, I thought the same thing and that maybe a good launch jerked it free.
 Sucks Don, I've seen some posts about you getting back on track and then this.  When it rains it pours, maybe time for a Ford 9" swap and get it over with?
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Mike 87GN T-Top down 421lbs. Rebuild #2, BLK/BL Paint w/Custom Metal Flares, VPE Stg 3 Heads, 210/215 Roller Cam, TA49, V2 w/Blitz Blow Off, PI 3400 5disc, KB Plenum/70mm TB, Razor's Alky Kit, 60lb Inj, -8/-6 SS Fuel Lines, MBC, Pwr Plt, PTE Oil Relocator, Preluber, Z06 Maf, Translator, Volt Master, Poston Headers, THSS 3.5" DP/Test Pipe, SS 2.5" Y Pipe w/No Muffs, PST 2" Drop, Poly Bushings, Boxed Upper/Lower Arms, Vacuum Converted, Aerospace 11" Brakes w/SS lines, Alum Drums, Polished Autodrags 15x8/15x10, 275/60 Nitto 555Rs
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June 30th, 2008, 11:51 PM
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I thought you were gonna say a wrist watch. Here is what I found in mine:
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87' T-top GN, 11.19 @ 122.7 on DR's and 100 octane unleaded, 3850 lbs with driver, Stock original 103K shortblock, PTE T64E turbo, 206/210 roller cam, Champion heads and intake, stock rockers, stock TB, Big Mouth cold air kit, PTE front mount IC, 3" THDP, 3" Torque Tech Exhaust, 3" MAF, Translator Plus, 60# injectors, Extender Chip 23/21, Yank converter, PTS transmission.
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July 1st, 2008, 12:11 PM
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Quote:
I don't think I want to spend the $$$ for a Ford 9" swap. I'm not running this car that hard. It's going to be primarily a street car.
__________________
-Don 87 GN 11.07 @ 125 mph (old combo w/ PT67 DBB, GN1 heads, 120k mile stock shortblock, ended up splitting block )Now running a 44k original mile stock longblock, stock turbo (for now), PTE FMIC, 60 lb inj, TT chip, TA Perf 3" DP, GNX style VDO dash, Vince Janis built 200-4R w/ 10" 3400 n-l stall (can you say NO turbo lag? LOL) Words of experience: Going fast was nice, but when your car is down every single year because you broke something, it isn't fun anymore and unless money grows on trees at your house, you don't regret going back to stock, and being able to drive and enjoy your car again
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July 1st, 2008, 01:08 PM
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Quote:
I have two original factory covers (verified) laying here on the shelf at home. Neither has any type of magnet in them. I'm guessing yours was glued in by a previous owner.
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TurboDave EWCS(SW) USN Ret H&N Turbo Racing Email Us Sevierville, TN TranslatorPro MAFless fuel, spark and boost management 86 GN(TranslatorPro/ExtenderPro on speed density w/boost & fuel pump control,PLX-WB) (original owner) 87 GN (second owner) 84 L69 Z28 (original owner) 01 Excursion LTD 7.3L PSD(Power Stroke Diesel), Turbo, 4X2 08 Honda Accord EX-L, 3.5V6, AT My Photo Gallery
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July 1st, 2008, 02:44 PM
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The magnets were installed on facory equipped posi rear ends. If it doesn't have a magnet, then it was originally a non-posi. At least that is what I have seen over the last 20 years working on these things.
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Ken B.
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July 1st, 2008, 02:58 PM
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My turd has the magnet there as you can see in the pic. My car "had" factory posi..... The chunks in mine were part of a clutch diask and a tooth from the ring gear. I can't believe the magnet on yours. Never seen that before.
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87' T-top GN, 11.19 @ 122.7 on DR's and 100 octane unleaded, 3850 lbs with driver, Stock original 103K shortblock, PTE T64E turbo, 206/210 roller cam, Champion heads and intake, stock rockers, stock TB, Big Mouth cold air kit, PTE front mount IC, 3" THDP, 3" Torque Tech Exhaust, 3" MAF, Translator Plus, 60# injectors, Extender Chip 23/21, Yank converter, PTS transmission.
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July 1st, 2008, 04:15 PM
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Quote:
__________________
TurboDave EWCS(SW) USN Ret H&N Turbo Racing Email Us Sevierville, TN TranslatorPro MAFless fuel, spark and boost management 86 GN(TranslatorPro/ExtenderPro on speed density w/boost & fuel pump control,PLX-WB) (original owner) 87 GN (second owner) 84 L69 Z28 (original owner) 01 Excursion LTD 7.3L PSD(Power Stroke Diesel), Turbo, 4X2 08 Honda Accord EX-L, 3.5V6, AT My Photo Gallery
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July 1st, 2008, 04:27 PM
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Now somebody needs to explain something to me. How does a magnet come loose off a steel cover? I think these are designed not to come in contact with the ring gear. I just dont see it sliding around or coming loose. All I know is that I have a bear of a time cleaning mine when I pull the cover for maintainence.
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Eric Fisher OEM Parts Specialist for GM Vehicles e-mail me at efisher@billheard.com 86 Grand National 85 Riviera T-Type 84 Riviera T-Type 82 Regal 455
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