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Summer Differential and NP 205 Oil weights?

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Old 05-29-2016, 05:56 PM
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Originally Posted by gyman98
This is from my notes:

75-140 severe gear is for dana 60
75-110 severe gear is for dana 70
Why the difference between the two?
Old 05-29-2016, 08:31 PM
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Originally Posted by 1972RedNeck
Why the difference between the two?
Basically because that's what I found after researching it. Maybe the front diff sees higher temps because of the engine? The rear would also see higher temps from higher loading so I dunno
Old 05-30-2016, 12:42 AM
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Originally Posted by 1972RedNeck
Why the difference between the two?
Thicker oil in the front helps pull the truck thru the corners vs being pushed thru the corners. It helps with handling.

On the same not having a thicker oil in the rear diff would want to push the truck straight causing sudden oversteer.
Old 05-30-2016, 08:11 AM
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Originally Posted by 1320Fastback
Thicker oil in the front helps pull the truck thru the corners vs being pushed thru the corners. It helps with handling.

On the same not having a thicker oil in the rear diff would want to push the truck straight causing sudden oversteer.
wouldn't thicker oil cause more resistance? In turn causing the rear to push harder on the front?
Old 05-30-2016, 09:16 AM
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My second paragraph should of said "On the same Note..."

A thicker oil will make the diff tighter which in the front will help the inside wheel pull the truck thru the corner. It will cause more resistance in the spider gears giving more power to the open shaft with the least traction.

Yes if it was thicker in the rear it would cause more push on/than the front but push in a straight line square to the chassis. This could cause a binding where sudden snap oversteer could happen as the front tires break traction or scrub.
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Old 05-30-2016, 09:40 AM
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Originally Posted by 1320Fastback
My second paragraph should of said "On the same Note..."

A thicker oil will make the diff tighter which in the front will help the inside wheel pull the truck thru the corner. It will cause more resistance in the spider gears giving more power to the open shaft with the least traction.

Yes if it was thicker in the rear it would cause more push on/than the front but push in a straight line square to the chassis. This could cause a binding where sudden snap oversteer could happen as the front tires break traction or scrub.
I can see it in a full time 4WD car but our bricks? Besides I would bet 95% of us run with our hubs unlocked most of the time.
Old 05-30-2016, 10:27 AM
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My guess is the recommendation just carried over from past manuals.
Lighter 4x4 trucks pre diesel.
Old 05-31-2016, 11:52 AM
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Question

Originally Posted by thrashingcows
My diff guy recommends Lucas 85W140 for an excellent all year round diff fluid....front or rear. You can also run it in a transfer case too.
Originally Posted by mknittle
I second the Lucas products.
Brian & Mark:

Does this recommendation include Lucas grease (in tubes)? I've been working my way through a case of Kendall SuperBlu tubes, but the stuff tends to melt and leak everywhere , making a horrible mess. I recently bought the most expensive tube of grease carried by my local Lowe's -- it's a blue colored Lucas product that's much less messy. I'd like to switch over if Lucas makes a good grease?

I apologize in advance for the thread hijack.

Jim
Old 05-31-2016, 08:51 PM
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Originally Posted by james1
Brian & Mark:

Does this recommendation include Lucas grease (in tubes)? I've been working my way through a case of Kendall SuperBlu tubes, but the stuff tends to melt and leak everywhere , making a horrible mess. I recently bought the most expensive tube of grease carried by my local Lowe's -- it's a blue colored Lucas product that's much less messy. I'd like to switch over if Lucas makes a good grease?

I apologize in advance for the thread hijack.

Jim
I haven't tried their grease yet.
Old 11-11-2016, 10:27 AM
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I threw 75W-110 Severe Gear in both diffs & the Np205 and called it a day.

The "new" 75W-110 is the thicker end of the old 75W-90 spec, as todays 75W-90 oils are on the thinner end of the old spec.
Old 11-11-2016, 11:31 AM
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Originally Posted by mknittle
No winter? If there is no winter how do you know when it's summer.
In Phoenix, the only way to know that it is not summer is that the license plates change colors ...Mark
Old 11-11-2016, 01:56 PM
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Originally Posted by james1
Brian & Mark:

Does this recommendation include Lucas grease (in tubes)? I've been working my way through a case of Kendall SuperBlu tubes, but the stuff tends to melt and leak everywhere , making a horrible mess. I recently bought the most expensive tube of grease carried by my local Lowe's -- it's a blue colored Lucas product that's much less messy. I'd like to switch over if Lucas makes a good grease?

I apologize in advance for the thread hijack.

Jim
Sorry for the delay in responding....

I have been using a Shell grease for a few years. Mainly because a friend of mine works for a very large national commercial truck service and rental company....so he tosses me a tube from time to time. The grease is "Shell Gadus, S3 - V460D -2" This stuff is thick and sticks like dog poo on your boot....I really like it.
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