80w90 hypoid gear lube ?

[mckennaiii]

went to change out the front diff. fluid today in my 97 dodge intrepid with amsoil 75w90 synthetic gear lube, and when the mechanic went to take the drain plug loose there was a rubber sticker on the fill plug that stated [sae 80w90 hypoid gear lube only].
so he advised not to change it until i had the 80w90 hypoid gear lube vs. the 75w90 synthetic gear lube.
what are your thoughts on this and where can i get [80w90 hypoid gear lube]?

thankx,
bill

 

[mechtech2]

Isn't the Amsoil rated as a hypoid oil?

 

[Kestas]

I believe it's okay to use a 75W-90 synthetic when a manufacturer specifies 80W-90. I've read many posts where people do that.

Your mechanic is probably not a BITOGer and was being cautious, not knowing it's okay.

Do you tow?

 

[mckennaiii]

i'm not sure if the amsoil 75w90 i have is rated as a hypoid gear lube. i have an email into amsoil tech support now.

my mechanic is not a BITOGer for sure but he didn't want me to take a chance on screwing up the wife's car so i can appreciate that for sure.

the fill hole on the front diff. is a dog to get to. what pump do you recommend to get to make this an easier task?

 

[mckennaiii]

no towing.

 

[Terry]

Amsoil GL5 gear oils meet the requirement for hypoid gears commonly found in automotive applications. Their GL4 may even meet it. Depends.

The difference is about double the EP adds in hypoid qualified lubes over normal industrial gear lubes.

Amsoil meets all those as far as I am aware.

 

[Kestas]

The fill plug probably hasn't moved for 10 years in your rust belt climate. It WILL be a dog to get to.

I undid a 5 year old diff fill plug on my driveway using a breaker bar, hydraulic lift, and the weight of the truck to turn the plug. Something had to give!... luckily it was the plug. Your mechanic will probably use an impact gun.

Once it's removed, it's good to treat the threads with antiseize compound or teflon tape for the next service.

I've never pumped out diff fluid. I always let it drain and clean out the silt and magnet from the inside. I'm not familiar with your design, but that may mean removing the diff cover and replacing the gasket. The dealers just pump it out.

 

[ConfederateTyrant]

You are safe to use the Amsoil 75w-90, whether it's the Long Life or Severe Gear.

Amsoil's site for Severe Gear 75w-90:
"Use in differentials, manual transmissions or other gear applications where one or more of the following standards are specified: API GL-5 & MT-1, MIL-PRF-2105E, Dana SHAES 234 (Formerly Eaton PS-037) for 250,000 miles, Mack GO-J, Arvin/Meritor 0-76N (75W-90), plus hypoid gear oil specifications from all domestic and foreign manufacturers such as GM, Ford and Daimler Chrysler. Can also be used in axles where API Service GL-4 lubricant is recommended."

Amsoil's site for Long Life 75w-90:
"Use AMSOIL Extended Drain Synthetic Gear oils in differentials, manual transmissions or other gear applications where one or more of the following standards are specified: API GL-5 & MT-1, MIL-PRF-2105E, Dana SHAES 234 (Formerly Eaton PS-037) for 250,000 miles, Dana SHAES 256 (Formerly Eaton PS-163) for 500,000 miles, Mack GO-J & GO-J+, Meritor 0-76N (75W-90) & 0-80 (80W-140), and Navistar TMS 6816 plus hypoid gear oil specifications from all foreign and domestic manufacturers such as GM, Ford and Daimler Chrysler. Can also be used in rear axles where API Service GL-4 lubricant is recommended."

 

[MaximaGuy]

Kestas: Does the normal gravity drain, bring other gluey stuff along with what is collected on the magnets.

Is there any way to clean the inside thoroughly (kerosene is a very good cleaner) before putting in the fresh gear oil thro the fill hole without opening the cover.

 

[mckennaiii]

i should have made it clearer. [pump]
need a pump to pump in the new.

the fill hole on the front diff. is a dog to get to. what pump do you recommend to get to make this an easier task?

 

[INDYMAC]

Many oil companies sell 80W90 GL5 hyploid gear oil. Just go buy some at your local auto parts store. If the recommendation was for SAE 90 only, that usually has to be special ordered and is available from much fewer companies.

 

[Mike_dup1]

Hypoid gears requure EP lubes. Some brands describe themselves as "hypoid" instead, a term which is synonymous with EP

EP - Extreme Pressure

Quote:

---

Hypoid Gears

A hypoid is the name given to a type of helical (spiral) gear. The main application of this is in the final drive of an automobile, where the direction of the drive carried by the propeller shaft has to be turned through 90 degrees in order to power the driven wheels. Conventional straight-cut or spur-cut gears, with perpendicular teeth, are considered to be too noisy in use, and a normal spiral bevel does not always give sufficient contact area. The hypoid gear places the pinion off-axis to the crown wheel which allows the pinion to be larger in diameter. In a normal passenger car the pinion is always offset to the bottom of the crown wheel. This provides for longer tooth contact and serendipitously allows the propeller shaft that drives the pinion to be lowered, reducing the "hump" intrusion in the passenger compartment floor.

A hypoid gear incorporates some sliding and can be considered halfway between a straight-cut gear and a worm gear. Special gear oils are required for hypoid gears because the sliding action creates extreme pressure between the teeth.

---

 

[KBFXDLI]

You should follow the spec for Chrysler because they make some noisy diffs

 

[gtx510]

hyploid diff in a FWD Intepid?
Manual transmission? auto?
either way it seems like a GL-4 or GL-5 should work, even 40 or 50wt engine oil.