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Username Post: Differential Cover Gasket        (Topic#363842)
Ray1 
Member
Posts: 65

Reg: 12-05-03
01-03-21 08:48 AM - Post#2811254    



O'Reilly's has two different gaskets for the 10 bolt hole diff - one for the 8.625 ring gear, one for 8 1/2 and 8 5/8's ring gears. How can I tell which one I need? This truck is a short bed 4X4 with the 4.8 and automatic transmission.

Thanks for your help!



 
2plus2 
Member
Posts: 1261

Loc: Mission,BC
Reg: 02-03-05
01-03-21 09:36 AM - Post#2811260    
    In response to Ray1

It will be the 8.6

69 Canadian Pontiac 2+2 Convertible
Factory L48 350 Chev,TH350,PW,PT
99 Silverado RCLB 4.8 NV4500 14BSF 4.10's locker 6" Procomp 35'S
07 Town Car Loaded,Tinted,Getting Bagged


 
Ray1 
Member
Posts: 65

Reg: 12-05-03
01-04-21 08:18 AM - Post#2811323    
    In response to 2plus2

Thanks!



 
Ray1 
Member
Posts: 65

Reg: 12-05-03
01-13-21 10:48 PM - Post#2812038    
    In response to Ray1

BTW, is this a limited slip differential? It's got more gears in the carrier than my one wheel drive car.



 
2plus2 
Member
Posts: 1261

Loc: Mission,BC
Reg: 02-03-05
01-14-21 01:10 PM - Post#2812074    
    In response to Ray1

Sounds like a G80 locking diff
Do not use additives meant for a limited slip
Just use reg gear oil

69 Canadian Pontiac 2+2 Convertible
Factory L48 350 Chev,TH350,PW,PT
99 Silverado RCLB 4.8 NV4500 14BSF 4.10's locker 6" Procomp 35'S
07 Town Car Loaded,Tinted,Getting Bagged


 
Ray1 
Member
Posts: 65

Reg: 12-05-03
01-15-21 11:26 PM - Post#2812183    
    In response to 2plus2

I wish I'd taken a picture of it now. Odds are it is a G80. I didn't put any additives in.

I see there's a low opinion of the G80 out there, but this one has 177,000 miles with no knocking, and no metal flakes in the old diff fluid. It hasn't been driven like a hot rod though.



 
CowboyTrukr 
"10th Year" Silver Supporting Member
Posts: 4543
CowboyTrukr
Loc: Salt Lake City
Reg: 06-20-09
01-16-21 08:27 AM - Post#2812198    
    In response to Ray1

My ‘94 had over 200K on it when I sold it. Original G80, never a problem.

Greg

‘01 Silverado 2500HD 8.1/Allison 1000 Xcab/LB
'00 Explorer XLT 4.0 SOHC V6 Auto
'95 K1500 Z71 EC Short Step 5.7L+0.040/NV3500 SOLD

"The only thing necessary for evil to triumph is for good men to do nothing" Sir Edmund Burke


 
wagonman100 
Site Ambassador
Posts: 14939

Loc: Baltimore, MD
Reg: 11-27-04
01-16-21 10:43 AM - Post#2812201    
    In response to CowboyTrukr

My G80 blew up with 170,000. Started to chatter going around corners and locking when it wasn’t supposed to. Went out in short order. Sent the axle pin right through the diff. cover. But I am the third owner and I bought it with 122,000 on it. Who know what it went through before me. The G80 isn’t the greatest design though. But it’s too pricey to change over to a conventional posi or air lockers.

Jay
Friends don’t let friends drive Fords.

1999 Silverado Z71 4X4 extra-cab short bed
1983 Malibu Fauxmad - tubbed
1978 El Camino Kustomized
1972 Monte Carlo
1957 210 handyman wagon
1957 Nomad sport wagon
1957 Cameo Carrier


 
Ray1 
Member
Posts: 65

Reg: 12-05-03
01-17-21 07:51 AM - Post#2812250    
    In response to wagonman100

I saw someone mention converting to the TrueTrac.
This truck is in great condition and I can see picking up the pieces to do a conversion when the G80 eventually goes.



 
wagonman100 
Site Ambassador
Posts: 14939

Loc: Baltimore, MD
Reg: 11-27-04
01-17-21 01:53 PM - Post#2812273    
    In response to Ray1

I wound up putting in a used rear for $500.00. Of course the used one still has the G80 in it. I wasn’t sure all of what was damage when the other one went. I could see the carrier was cracked and that was enough for me. The $500.00 was probably a lot less than a new carrier, setup and whatever else it would have needed.

Jay
Friends don’t let friends drive Fords.

1999 Silverado Z71 4X4 extra-cab short bed
1983 Malibu Fauxmad - tubbed
1978 El Camino Kustomized
1972 Monte Carlo
1957 210 handyman wagon
1957 Nomad sport wagon
1957 Cameo Carrier


 
Ray1 
Member
Posts: 65

Reg: 12-05-03
01-19-21 08:17 PM - Post#2812439    
    In response to wagonman100

Probably. I guess I'll see what I can come up with, Lord knows I've got enough other things going on. Luckily it's not a pressing issue at the moment.



 
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