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Gear Oil for Spool #4607710
12/18/17 10:17 PM
12/18/17 10:17 PM
Joined: Nov 2017
Posts: 683
South Carolina
eyeofthetiger Offline OP
eyeofthetiger  Offline OP
Joined: Nov 2017
Posts: 683
South Carolina
Let's say a standard GM 8.5" 10-bolt rear end normally takes 80W-90 GL-5 gear oil. Should I consider something different if I take out the silly spider gears and put in a mini-spool? Maybe it doesn't make a lick of difference. Probably not. You can tell me to use something fancy, but then I might not be able to afford tires.


2017 Ford Fiesta 1.0T - Valvoline SynPower 5W-20, Motorcraft FL910S
1988 GMC K1500 4.3/700R4 - Supertech 15W-40, Fram TG3980
1986 Ford Ranger 2.0 - uhh
Re: Gear Oil for Spool [Re: eyeofthetiger] #4607719
12/18/17 10:40 PM
12/18/17 10:40 PM
Joined: Jun 2003
Posts: 17,492
Deplorable in apple valley, ca
Chris142 Offline
Chris142  Offline
Joined: Jun 2003
Posts: 17,492
Deplorable in apple valley, ca
The 80w90 is what you want for the ring and pinon. I have a detroit locker in my ford and its quite a neusance. It clangs and bangs and eats tires.


02 Wrangler durablend 10w40
87 F250 traveler 15w40
04 Tahoe super-s 10w30
Z400 castrol T 10w40
Can am maveric edge 5w40
57 case tractor 15w40
Re: Gear Oil for Spool [Re: eyeofthetiger] #4607720
12/18/17 10:40 PM
12/18/17 10:40 PM
Joined: Sep 2015
Posts: 5,955
Kalifornia Kollective
BrocLuno Offline
BrocLuno  Offline
Joined: Sep 2015
Posts: 5,955
Kalifornia Kollective
OK, this gets a bit tricky. What are you trying to accomplish in the end?

One approach is to use the B-O-P 8.6 w/o the C-Clips as a small drag car rear end. Spools readily available, and a bunch stronger than the Chevy version smile Still an 10-Bolt. Many rears will swap over directly, housing and all.

Or, go to Redline Explosion Proof and it'll live for a while. But you may still spit out an axle when a clip goes frown

Last edited by BrocLuno; 12/18/17 10:41 PM.

Formerly in marine engineering. In an earlier life I owned my own petroleum tank truck, and hauled for the majors and independent's.
Re: Gear Oil for Spool [Re: BrocLuno] #4607734
12/18/17 11:01 PM
12/18/17 11:01 PM
Joined: Nov 2017
Posts: 683
South Carolina
eyeofthetiger Offline OP
eyeofthetiger  Offline OP
Joined: Nov 2017
Posts: 683
South Carolina
Originally Posted By: Chris142
The 80w90 is what you want for the ring and pinon. I have a detroit locker in my ford and its quite a neusance. It clangs and bangs and eats tires.


I had one of those Powertrax lockers in another truck. It was fine, but this time I figure I can do without the clanging and banging. Just straight tire eating. A mini spool is cheaper, too.

Originally Posted By: BrocLuno
OK, this gets a bit tricky. What are you trying to accomplish in the end?

One approach is to use the B-O-P 8.6 w/o the C-Clips as a small drag car rear end. Spools readily available, and a bunch stronger than the Chevy version smile Still an 10-Bolt. Many rears will swap over directly, housing and all.

Or, go to Redline Explosion Proof and it'll live for a while. But you may still spit out an axle when a clip goes frown


It's not exactly a race truck. The 4.3 might put down 120 HP on a good day. It is more of a utilitarian thing. I do some work out in the woods, and I never ever want to get stuck out there. Sure, it's 4WD, but more is better. Zero cares about handling on pavement or tire wear. It needs to pull trees up muddy hills.
Would it be crazy to install a 3-point hitch and drag a box blade with this truck?
So, Redline Explosion Proof is the gear oil I should use.


2017 Ford Fiesta 1.0T - Valvoline SynPower 5W-20, Motorcraft FL910S
1988 GMC K1500 4.3/700R4 - Supertech 15W-40, Fram TG3980
1986 Ford Ranger 2.0 - uhh
Re: Gear Oil for Spool [Re: eyeofthetiger] #4608146
12/19/17 12:15 PM
12/19/17 12:15 PM
Joined: Sep 2015
Posts: 5,955
Kalifornia Kollective
BrocLuno Offline
BrocLuno  Offline
Joined: Sep 2015
Posts: 5,955
Kalifornia Kollective
For your application, just use the OEM recommended lube. Redline is overkill. You are taking care of the ring/pinion/bearings.

You are not hitting it with a trans-brake launch at 5,000 laugh


Formerly in marine engineering. In an earlier life I owned my own petroleum tank truck, and hauled for the majors and independent's.
Re: Gear Oil for Spool [Re: eyeofthetiger] #4608245
12/19/17 01:30 PM
12/19/17 01:30 PM
Joined: Dec 2016
Posts: 6,466
Waco, TX
Linctex Offline
Linctex  Offline
Joined: Dec 2016
Posts: 6,466
Waco, TX
Originally Posted By: eyeofthetiger
It is more of a utilitarian thing. I do some work out in the woods, and I never ever want to get stuck out there. Sure, it's 4WD, but more is better. Zero cares about handling on pavement or tire wear. It needs to pull trees up muddy hills.


Sounds like a fun truck. Reminds me of my Chevy LUV 4WD when living in the mountains of Montana. It was a VERY capable off-road truck.


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: Gear Oil for Spool [Re: BrocLuno] #4608503
12/19/17 06:02 PM
12/19/17 06:02 PM
Joined: Nov 2017
Posts: 683
South Carolina
eyeofthetiger Offline OP
eyeofthetiger  Offline OP
Joined: Nov 2017
Posts: 683
South Carolina
Originally Posted By: BrocLuno
For your application, just use the OEM recommended lube. Redline is overkill. You are taking care of the ring/pinion/bearings.

You are not hitting it with a trans-brake launch at 5,000 laugh


I could try hitting the rev limiter in neutral and slamming it into drive ... shocked

Just by chance, the front differential happens to have Redline 75W-90. It was all I had on hand when I some minor linkage repairs and deleted the electronic axle lock. Maybe I should put Redline in the back just so everything matches.

Last edited by eyeofthetiger; 12/19/17 06:06 PM.

2017 Ford Fiesta 1.0T - Valvoline SynPower 5W-20, Motorcraft FL910S
1988 GMC K1500 4.3/700R4 - Supertech 15W-40, Fram TG3980
1986 Ford Ranger 2.0 - uhh
Re: Gear Oil for Spool [Re: eyeofthetiger] #4613349
12/24/17 08:22 PM
12/24/17 08:22 PM
Joined: Jun 2011
Posts: 1,759
Crawfordville FL
SilverFusion2010 Offline
SilverFusion2010  Offline
Joined: Jun 2011
Posts: 1,759
Crawfordville FL
Why take out the lock?


2010 Ford Fusion SE 3.0L V6, 178k miles M1 HM 10w-30

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