Leaking ATF at transmission/transfer case

[ferioking]

Hello,

I have an imported 1998 Toyota Landcruiser 100 series with the 4.2 diesel with the A442F transmission. Just recently got back from a 3,500 mile round trip from Texas to New Jersey. I went to back out the 100 series out the garage to give it an wash and noticed a small amount of ATF on the ground. During my trip I didn’t have any weird shifts or symptoms.

I crawled underneath the 100 series and tracked the ATF leaking from rear of transmission where it meets the transfers case.

Checked ATF level and it reads full on “hot” side of dipstick with vehicle cold. The ATF was reading full on “cold” side with vehicle cold a month ago after performing a drain and fill.

I checked around the transfer case and transmission with no other leaks. Transmission cooler lines were leak free. Dipstick out of transmission was also leak free.

Can anyone give me any input on possible fix? Thank you in advance.

 

[ferioking]

Dipstick level when vehicle is cold shows full on “hot”

 

[3_puppies]

might be the rear seal on the trans?
the transfer and trans do not share oil and they use different fluids

 

[BullElk]

AT-205 Reseal

 

[CrackedManifold]

^^^^ AT-205

Works wonders for a leaking steering rack.

 

[2001LC]

First check A/T Fluid level, after driving to warm up (~160F) and shifting through all gear. While parked on level ground, engine idling, A/T in P or N. Check level by first pulling and wiping dip stick, then reinsert "fully" and pull out to read within ~3 seconds.

Clogged breather?
Remove long breather hose, from end at Y (back of A/T, TC adapter case). Let hose hang down for 6 to 8 hours (best in warmest time of day), into a catch can. See if any fluid come out. Of course you can remove long hose from both ends, to clear on the bench. But we'd like to know if any fluid in it, which could be clogging it. Next test your breather to make sure functioning properly. I use my HP air, but one can simple blow into hose. Air should pass easily, through hose out breather.

Knowing if breather or its hose clogged, is a valuable clue. If so, as fluid in Transfer case and A/T expands and foams. The foams can pass from one to the other via Y (98-02), that connect TC & A/T to the one breather.

Flush transfer case. I fill with fresh Mobil 1 75w-90 @ ~30K after draining (dripping) for >1 hour at >68f. To set TC level: Parked on level ground. You may want to add measured amount of AT-205 at this point (optionable). Fill w/M1 75w-90, until flows out, fill hole. Let set/rest 15 mins (@ 68F) or drive to warm, then then top, until flow out fill hole. Place new gasket on fill plug, as you did on drain plug. Torque to 27ft-lbf.

Flush A/T. In 98-02, I use 12 qt. Mobil 1 Multi Vehicle Full synthetic.

Clean all oils from A/T & TC. Clean again again after a few months and few thousand of miles. Monitor for leak. We can live with very minor leak. But requiers check levels as frequent as leak dictates.

If leak issue of A/T - TC clogged breather and or over filling and or mixing of fluids. Above, may be all that is needed. If on the other hand, leak persist. Determine which fluid leak is. Likely gear lube. Reseal TC case.

 

[ferioking]

First check A/T Fluid level, after driving to warm up (~160F) and shifting through all gear. While parked on level ground, engine idling, A/T in P or N. Check level by first pulling and wiping dip stick, then reinsert "fully" and pull out to read within ~3 seconds.

Clogged breather?
Remove long breather hose, from end at Y (back of A/T, TC adapter case). Let hose hang down for 6 to 8 hours (best in warmest time of day), into a catch can. See if any fluid come out. Of course you can remove long hose from both ends, to clear on the bench. But we'd like to know if any fluid in it, which could be clogging it. Next test your breather to make sure functioning properly. I use my HP air, but one can simple blow into hose. Air should pass easily, through hose out breather.

Knowing if breather or its hose clogged, is a valuable clue. If so, as fluid in Transfer case and A/T expands and foams. The foams can pass from one to the other via Y (98-02), that connect TC & A/T to the one breather.

Flush transfer case. I fill with fresh Mobil 1 75w-90 @ ~30K after draining (dripping) for >1 hour at >68f. To set TC level: Parked on level ground. You may want to add measured amount of AT-205 at this point (optionable). Fill w/M1 75w-90, until flows out, fill hole. Let set/rest 15 mins (@ 68F) or drive to warm, then then top, until flow out fill hole. Place new gasket on fill plug, as you did on drain plug. Torque to 27ft-lbf.

Flush A/T. In 98-02, I use 12 qt. Mobil 1 Multi Vehicle Full synthetic.

Clean all oils from A/T & TC. Clean again again after a few months and few thousand of miles. Monitor for leak. We can live with very minor leak. But requiers check levels as frequent as leak dictates.

If leak issue of A/T - TC clogged breather and or over filling and or mixing of fluids. Above, may be all that is needed. If on the other hand, leak persist. Determine which fluid leak is. Likely gear lube. Reseal TC case.

View attachment 4044934
View attachment 4044933
View attachment 4044932

View attachment 4044930

View attachment 4044931View attachment 4044929

Checked ATF fluid as stated and reads low so I’m losing ATF fluid. I checked TC and it’s only gear oil in there. Will have to check breather hoses to figure out if they’re clogged.

 

[ferioking]

Is “transfer breather B” on picture what your referring to check if clogged?

 

[2001LC]

The long hose that travels to engine.