THE BLACK MAMBA
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I just replace my differential cover now i need to fill it back up...What is the best fluid to use for the rearend..Thanks
What is the best differential fluid to use..
- Thread starter THE BLACK MAMBA
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I'm not sure which is the best gear oil to use.
I've always just used the conventional gear oils from the auto parts stores without any problems.
Which ever gear oil you decide to use don't forget to add a bottle of posi-trac gear oil additive.
AutoZone.com | Gear Oil Additive
John
I've always just used the conventional gear oils from the auto parts stores without any problems.
Which ever gear oil you decide to use don't forget to add a bottle of posi-trac gear oil additive.
AutoZone.com | Gear Oil Additive
John
gnbooster87
its only a six
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- Aug 19, 2004
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75w95 synthetic oil with limited slip additive
northerngn
Master Monkeywrench
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- Oct 8, 2006
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synthetic 75-90
only add additive if chattering is a problem
i have no addiditve and no chattering and posi works great has over 120k on it still cutting 1.60 60 with it
only add additive if chattering is a problem
i have no addiditve and no chattering and posi works great has over 120k on it still cutting 1.60 60 with it
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In the race cars, we use synthetic.
Posi lube should only be used if there is an issue with "chattering" when turning. It does REDUCE the efficiency of the posi unit by letting it slip more.
Seen more than one GN running at the track spinning one tire with a posi unit that had the lube installed.
Posi lube should only be used if there is an issue with "chattering" when turning. It does REDUCE the efficiency of the posi unit by letting it slip more.
Seen more than one GN running at the track spinning one tire with a posi unit that had the lube installed.
Doing some reading on the Mobil 1 synthetic gear oil and it appears it already has limited slip additive in it, i don't know if this is true for all brands of synthetic gear oils.
Mobil 1 Synthetic Gear Lubricant Ls 75W-90 Combines Wax-Free Synthesized Hydrocarbon Base Oils And A Specially Designed Extreme-Pressure, Limited-Slip, Sulfur-Phosphorous Additive System To Provide A Significantly Higher Level Of Performance In Rear Axles And Differentials Versus Conventional Fluids. Greater Film Strength At Higher Operating Temperatures, Reduced Fluid Friction And Low-Temperature Application Down To -50?C Provides Significant Advantages Versus Conventional Mineral Oil Formulations. It Reduces Wear And Spalling Under The High Speed, High Torque And High Horsepower Conditions In Competitive Racing And High Performance Automobiles. This Unique, High Technology Final Drive Gear Lubricant Has Demonstrated Outstanding Performance Including; Fuel Economy, Extended Drain, Long-Term Friction Retention, Low-Temperature Capability And Improved Differential/Axle Durability And Cleanliness.
John
Mobil 1 Synthetic Gear Lubricant Ls 75W-90 Combines Wax-Free Synthesized Hydrocarbon Base Oils And A Specially Designed Extreme-Pressure, Limited-Slip, Sulfur-Phosphorous Additive System To Provide A Significantly Higher Level Of Performance In Rear Axles And Differentials Versus Conventional Fluids. Greater Film Strength At Higher Operating Temperatures, Reduced Fluid Friction And Low-Temperature Application Down To -50?C Provides Significant Advantages Versus Conventional Mineral Oil Formulations. It Reduces Wear And Spalling Under The High Speed, High Torque And High Horsepower Conditions In Competitive Racing And High Performance Automobiles. This Unique, High Technology Final Drive Gear Lubricant Has Demonstrated Outstanding Performance Including; Fuel Economy, Extended Drain, Long-Term Friction Retention, Low-Temperature Capability And Improved Differential/Axle Durability And Cleanliness.
John
turbo nasty
Turbo Dojo / MNTR
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All I can say is when you buy a new Eaton posi unit (clutch type) it has a tag on it the says DO NOT USE SYNTHETIC OIL AS IT WILL HAMPER CLUTCH OPERATION.
Im just saying
Straight dino Valvoline here wit a tube of posi additive.
Im just saying
Straight dino Valvoline here wit a tube of posi additive.
salvageV6
Daily Driver
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- May 25, 2001
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Non-synthetic with one bottle of GM posi-traction additive.
Whatever the local garage has in the big pump and 30 gallon container.
Worked okay on the daily for 180K miles.
I did try the Kenne Bell cool greenish/blue jug once, but found the noise was the crappy stock tires locking the clutches going slow around a tight corner.
Once those crappy stock Goodyear tires wore out at 18K miles all was good and never a noise from the clutches since.
Dino. with posi. lube. :smile:
Whatever the local garage has in the big pump and 30 gallon container.
Worked okay on the daily for 180K miles.
I did try the Kenne Bell cool greenish/blue jug once, but found the noise was the crappy stock tires locking the clutches going slow around a tight corner.
Once those crappy stock Goodyear tires wore out at 18K miles all was good and never a noise from the clutches since.
Dino. with posi. lube. :smile:
driveshaft man
New Member
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Use any name brand(Pennzoil,Valvoline,Castrol) High Performance rated 80w90 gear oil.It will already have some posi friction modifier .As previously posted,add GM additive if the chatter bothers you ,or Ford additive if the chatter is bad.Additive makes everything slicker so posi is less effective.
Extreme cold climates are the only place you need synthetic oil......subject for big debates.....
Extreme cold climates are the only place you need synthetic oil......subject for big debates.....
GARY HARVEY
Member
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- Aug 17, 2001
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Stock application... ?
If this is your setup, any of the typically available gear oils will do a good job.
Now, if you are upping the equation, improving the lube per your torque requirement should be kept in mind.
Royal Purple, RedLine, NEO, Amsoil, etc., etc., if you can find them, all tend to fill the gap and loosen the hold on your wallet, keeping in mind, you get what you pay for.
Blah, Blah, Blah.
If this is your setup, any of the typically available gear oils will do a good job.
Now, if you are upping the equation, improving the lube per your torque requirement should be kept in mind.
Royal Purple, RedLine, NEO, Amsoil, etc., etc., if you can find them, all tend to fill the gap and loosen the hold on your wallet, keeping in mind, you get what you pay for.
Blah, Blah, Blah.
THE BLACK MAMBA
Active Member
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Anyone using Royal Purple I seen some at Autozone and how much fluid does it take 1qt + additive to fill the differential.... thanks
THE BLACK MAMBA
Active Member
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any additive?
i've got Royal Purple in mine and its not nice when turning. gonna try some GM additive.
ANY car with a clutch type posi unit should run straight dino oil. The clutch friction is what makes the damn thing work. 
Any super slippery synthetic oil or additive chit in the clutches and it won't be a tight posi anymore. :wink:
Posi chatter going around corners means you have a tight, good working posi. The additive just makes the clutches slip so they don't chatter.
The ONLY rears I use synthetic oil in... are the ones with a spool in them. In that case, you want the slipperiest chit you can find.
Any super slippery synthetic oil or additive chit in the clutches and it won't be a tight posi anymore. :wink:
Posi chatter going around corners means you have a tight, good working posi. The additive just makes the clutches slip so they don't chatter.
The ONLY rears I use synthetic oil in... are the ones with a spool in them. In that case, you want the slipperiest chit you can find.
