differential rebuild , your advice wanted

[Marauder04]

when i start driving forward or reversing, truing left or right , I hear noises for the rare end, metal grinding to be exact.
This noise goes away when i drive above 10-15. I went to change the differential fluid and it was pretty bad !!
so I figured it's the time to upgrade the whole thing.


Ford Racing 4.10 Gears and Install Kit
http://www.americanmuscle.com/410-gear-oil-kit-8613.html

Am I going to need a new Differential Cover ?

Eaton truetrac differential ? worth it ?
http://mudflaps.com/i-7239219-eaton-differentials-913a561-detroit-truetrac-differential.html?gclid=CLqz-YHPgb4CFeZDMgodI2gAhg


31 SPLINE AXLES or 28?

did I miss something?

Thanks in advance

[Comin' in Hot]

you won't need a diff cover unless there is something wrong with yours or you want to upgrade it.

If you plan on drag racing, I hear the truetracs aren't the best choice, and our diffs are fine.

here is a parts list i put together for a rebuild I did.

http://www.mercurymarauder.net/forums/showthread.php?t=88972

[MOTOWN]

Not a fan of the oem Trac loc diffs, the Eaton limited slip, or Auburn Pro series are much better/stronger units.

[GreekGod]

Always get 31 spline axle shafts when changing the differential. Replace the pinion crush spacer with a solid shim kit.

Any clutch type diff will eventually fail. Do it once with a Trutrac and fergit about it.

Cleaning the inside of the housing is imperative, and difficult to do without a complete disassembly.

A diff cover with load bolts for the bearing caps is a nice addition. For the most strength, have the axle tubes welded to the center casting, by an expert with the proper alignment bar and bearing adapters to keep the tubes straight.

=============================

[Curless]

We've done a boat load of em! At the shop we recommend the following:

1. Axles, if you have bad ones, upgrade to 31 spline.

2. 31 spline posi, whatever flavor of them you want. Each person has there own belief on which one is better and why

3. 4.10's we use FORD Motorsports only

4. Ford instal kit

5. girdled rear end cover, its a must when we do them. Not only does it look nice, it gives you a drain for the rear end for future fluid changes, and it will increase the structural strength of the rear end.

6. tuner with a tune from whom ever you would like....

7. If you need rear brake work now is the time, also you will need some good fluid and additive

[Marauder04]

that's awesome guys thanks a lot.

may I get the parts number so I don't get anything wrong

I'm totally new to this world :P

[Marauder04]

this is WHAT i GOT IN MY eBAY CART


---FORD RACING 8.8" RING & PINION GEAR INSTALLAT KIT M-4210-B2 / Brand New

---Ford Racing 8.8 410 Gears M-4209-88410

---913A561 Detroit Truetrac Limited Slip Ford 8.8" 31 Spline

now I just need the axles 31 spline part # so I could add them, and maybe also the differential cover part #. I'll get it if I still have some money left on the side lol :P

Tanks a lot!

[Curless]

Axle part number 8196793 from NAPA, they are 31 spline replacement axles.

T/A Performance rear end girdle part number TA_1806A

[GreekGod]

Dorman 31 spline shafts, $86 each + shipping >>>

http://www.rockauto.com/catalog/moreinfo.php?pk=1058906&cc=1387829

http://www.rockauto.com/

[Spectragod]

Don't forget axle bearings and seals, and replace all the races and bearings.

[Comin' in Hot]

I just had my rear end rebuilt today. The only things I reused were the housing and the carrier bearing caps.

Here is my parts list:

Two(2) Ford 31 spline axle shafts: 6W1Z-4234-A

One(1) Cobra diff assembly: AR3Z-4026-A

One(1) FRP 8.8 install kit: M-4210-C

One(1) Trick Flow 8.8 Carrier stud kit: TFS-85101-1

One(1) ARP Ring Gear Bolts: 250-3003

Four(4) Ford driveshaft Bolt w/ threadlocker: N800594-S100

One(1) 03-04 Cobra pinion flange: M-4851-B

One(1) Ratech solid pinion spacer kit: 4105


Pick one of the following Ford Racing ring and pinion gear sets:

3.55: M-4209-88355

3.73: M-4209-88373

4.10: M-4209-88410

4.30: M-4209-88430

4.56: M-4209-88456


Pick one differential cover (optional):

Ford Racing; Axle Gridle: M-4033-G2

Ford Racing; GT500 w/ cooler fins: M-4033-KA

Mag-Hytec; cooling fins, extra oil capacity: Ford #10-8.8

B&M; Axle girdle,cooling fins, extra oil capacity: 40297 (doesn't fit due to cooling fin/ sway bar interference, I'll update when/if modification works)

[Marauder04]

I just had my rear end rebuilt today. The only things I reused were the housing and the carrier bearing caps.

Here is my parts list:

Two(2) Ford 31 spline axle shafts: 6W1Z-4234-A

One(1) Cobra diff assembly: AR3Z-4026-A

One(1) FRP 8.8 install kit: M-4210-C

One(1) Trick Flow 8.8 Carrier stud kit: TFS-85101-1

One(1) ARP Ring Gear Bolts: 250-3003

Four(4) Ford driveshaft Bolt w/ threadlocker: N800594-S100

One(1) 03-04 Cobra pinion flange: M-4851-B

One(1) Ratech solid pinion spacer kit: 4105


Pick one of the following Ford Racing ring and pinion gear sets:

3.55: M-4209-88355

3.73: M-4209-88373

4.10: M-4209-88410

4.30: M-4209-88430

4.56: M-4209-88456


Pick one differential cover (optional):

Ford Racing; Axle Gridle: M-4033-G2

Ford Racing; GT500 w/ cooler fins: M-4033-KA

Mag-Hytec; cooling fins, extra oil capacity: Ford #10-8.8

B&M; Axle girdle,cooling fins, extra oil capacity: 40297 (doesn't fit due to cooling fin/ sway bar interference, I'll update when/if modification works)

Thanks bro. Now I got the money I'm ready to go to summit racing to buy all these stuff. I was at ford dealer this morning and we talked
about the cost of this rebuild. he told me if i provided all the parts that needs to be replaced the labor cost will be around 500$ more or less.
what do you think

[RF Overlord]

Pick one differential cover (optional):

Ford Racing; Axle Gridle: M-4033-G2

Ford Racing; GT500 w/ cooler fins: M-4033-KA

Mag-Hytec; cooling fins, extra oil capacity: Ford #10-8.8

B&M; Axle girdle,cooling fins, extra oil capacity: 40297 (doesn't fit due to cooling fin/ sway bar interference, I'll update when/if modification works)Also consider the TA Performance TA1806.

FWIW, TA Performance makes the Ford Racing units for Ford...the only difference is the name inscribed on the back.

[Marauder04]

Is there difference between M-4210-C And M-4210-C3 ?

Its the only thing I'm missing, I found M-4210-C3 but I don't know if they will fit or not.

[RubberCtyRauder]

It's the same kit per Summit Racing..it says soemthing like " the part # you are looking for is not available so here is a part # like the one you wanted"

[SAAAAAC]

Here was my 99 5-speed GM rebuild part list.
Feels real solid.

Ford Racing Master Rebuild Kit
Ford Racing 4.10 gears
Ford Racing Girdle
Detroit 31 spline Tru-Trac
Metco Upper and Lower Control Arms
Main Cap Stud Kit
Solid Spacer Ratech 4105 - Ratech Pinion Bearing Spacers
Moser 31 spline axles

[fastblackmerc]

Here was my 99 5-speed GM rebuild part list.
Feels real solid.

Ford Racing Master Rebuild Kit
Ford Racing 4.10 gears
Ford Racing Girdle
Detroit 31 spline Tru-Trac
Metco Upper and Lower Control Arms
Main Cap Stud Kit
Solid Spacer Ratech 4105 - Ratech Pinion Bearing Spacers
Moser 31 spline axles

+1 on the stud kit. If your in there spend a few extra bucks.