Re: Change dark ATF ?

Scott in Florida

"Tegger®" wrote

You "thought" wrong.

Is that right? Which FWD car would you happen to be thinking of? You might want to go do some research and then restate your position. I'll give you a start, your new position will go something like this, "some diffs in some FWD cars do have hypoid gears, which require the use of hypoid type lubricant"

Ian

All Corolla 3 spd FWD automatics (A131L) have a separate final drive reservoir, filled with ATF.

In news: snipped-for-privacy@4ax.com, Scott in Florida

Ian ... you did not read Tegger's accurately. He said... he thought hypoid oil was only used in Rear Wheel Drive because they used hypoid final drive gears. This implies that FWD does NOT use hypoid oil because FWD does not use hypoid ring/pinion gears.

Somebody look up Dodge Intrepid. They are FWD and I -believe- in years past their automatics have used (or use) hypoid gear oil in their final drive.

In news: snipped-for-privacy@4ax.com, Scott in Florida spake unto the

Florida 4 months if the year with 110 degrees desert heat? How about days of 120+ degrees?

Well my differential and my transmission guy disagree with you...so you are WRONG!!!

Scott in Florida

"Philip®" spake unto the masses in news:iv6dc.984$ snipped-for-privacy@newsread2.news.pas.earthlink.net:

It appears the Dodge Intrepid was available with the 42LE transaxle. The specified lube for the diff for that transmission is indeed hypoid.

-----------------

My defective memory recalled reading that hypoid gearing was introduced in cars in an attempt at lowering the driveshaft as car bodies and floors became lower and lower.

However, Packard, for one, used first hypoid gears in 1927.

Also however, a Google search reveals that hypoid gearing is used in many different non-automotive applications. Circular saws and industrial powertrains, for instance.

Hypoid gearing appears to:

Ya learn something new every day...

There is a distinct difference between hypoid and helical cut gears. The difference is hypoid gears impart a sliding contact surface ... that is to say the moment of contact starts at one end the meshing teeth and moves across the loaded surfaces as the gears turn. This requires a lubricant with a lot of sulfur to prevent galling. Helical cut gears experience little or none of this moving contact patch phenomenon. Neither do bevel gears, which are the noisiest.

Listen ... one of the new specs for T-V, Mercon V, and the latest Mopar formulation is to provide improved helical gear protection. Since the debutes of Dexron II and III many more FWD transmissions started lubricating the final drive gears with ATF and have NO separation of lubricant supply.

That your favorite trans guy buffaloed you on this one is not surprising. I've had three A131L apart now and in spite of an oil seal on the intermediate shaft, I would not trust this seal against oil migration as the tranmssion aged.

It's not the heat, it's the humidity ;-)

I know. Humidity makes it "hot" for the breathing human .... not for the engine. ;-)

LOL ain;t that the truth!

A bit of heat and a hell of a lot of humidity...

Scott in Florida

I know you feel you are right and will do anything to try to make your point...I still stand with my transmission guy.

You have my permission to come down and duke it out with him....LOL

btw he would kick your ass back to the land of fruits and nuts in about a microsecond....LOL

Scott in Florida

You mean "supposed to be filled with ATF". I know the PO of my deceased Toyota replaced the drive shafts, and I suspect some final drive ATF leaked out and was never replaced.

Tom

(Tammy Wynette) Stand by your (transmission) man, give him two arms to cling to And something warm to come to When nights are cold and lonely Stand by your man, and show the world you love him Keep giving all the love you can

Since about 1920...

SOME front-drive cars DO have hypoid gears in the differential (and need to). Chrysler LH series cars do because of the longitudinal engine layout. Running ATF in those will destroy them in no time, and in fact that's the ONLY reason they have a separate sump for the differential.