filling AWD MT Gear oil

[liteyouup]

Sort of a stupid question, but I need to make sure I'm not wrong here. When filling the transmission, I want the vehicle to be flat, it takes about 2 qts. and I stop when some spills out?

[Kurb_Appeal]

Yes,1.8 quarts is all she needs to go. Seems a little light to me but I guess its what works. It need to be 75-90 weight gear oil also.

[biglady112]

You are correct. It calls for 1.8qts, but I fill until it comes back out. It is closer to 2qts this way.

Steven

[KeltonDSMer]

Make sure you are using a GL-4 rated oil and not just a GL-5 because the GL-5 is too "slippery" for the syncros to work correctly. I have had great luck using a GL-5 synthetic with a quart of penzoil syncromesh which is thin and helps the syncros do their thing. I prefer Amsoil 75W90 GL-5 because there is a local supplier in Boulder.

[liteyouup]

Man, I'm kind of pissed. I had somebody else install the engine / tranny. It's a shep tranny, and it is leaking. I put maybe 45 miles on it, and it looked like it had to have lost a lot of fluid sitting in the garage so I lift the front, take off the fill plug, and lower it back down. Immediately a ton of gear oil comes out.

That #$@%er must have over-filled it, you think?

[Mirage]

Whatever the tranny won't be able to use or doesn't want will be spit out the breather hole on the back of the tranny.

Don't worry about it being overfilled if it didn't run out if the car was on jackstands. There really isn't any way to overfill a M/T other than forcing an extra quart into the transmission.

Marcus

[Kurb_Appeal]

I've always been told not to overfill. "It will blow the axle seals out". Again, what I've been told.

[liteyouup]

It's leaking from the seals like right in the middle of the tranny, oil every where. Poop.

[biglady112]

The seals are $7 a piece. All you need is a samll pry bar and 30 minutes of your time. Pop it out tap the new one in place.

Steven

[fusionsport]

I've always been told not to overfill. "It will blow the axle seals out". Again, what I've been told.


A lot of people say this, and it is partially correct. Here is what typically happens:

The overfilled gearbox is fine just putting around town and for short trips, because the GB oil doesnt get hot and expand much. Some oil might be pushed out of the vent, but not very much. At highway speeds and extended driving however the fluid gets hot, and expands quite a bit, and it needs and outlet. The vent again is the outlet, along with any sort of case or oil seal leak you might have.As long as the vent is pretty clear the fluid will simply make a mess and nothing will really get hurt. HOWEVER many times this vent is clogged and barely works, if it works at all. Now we have hot fluid and pressure in the gearbox. Fluid will escape(be pushed out) of any leak you might have in the case or axle seals. If you build a lot of pressure the axle seal can fail completely. Sometimes you can overfill the gearbox to the point that it simply cannot get rid of enough fluid through even a clean vent and the seals will fail, but thats pretty rare, its much more typical for the vent to be clogged and not functioning.

The best thing is to not overfill your gearbox, but if you do make sure the vent is working properly and it will just be a little messy.

[dougs90gsx]

What about Royal Purple? Anyone using it?

[DlandryTSI]

I have it in the talon. I have not seen any issues with it.

--Dave

[v413nc3]

I use redline lightweight but I wouldn't suggest it unless you have a dogbox or double synchros. It's pretty slick and would cause shifting issues.

[sbiggi]

I use Redline Heavy Weight shock proof.
Not sure how it would do in a nice new trannsimission, but it was a good band-aid for my dying syncros.

Shifts good except when its real cold out... shifts really slow then untill it warms up.

[fusionsport]

I use redline lightweight but I wouldn't suggest it unless you have a dogbox or double synchros. It's pretty slick and would cause shifting issues.


Are you using Liteweight Shockproof or Redline Lite? The Lite doesnt have the friction modifiers in it and can be too slick- it may help to add Friction Modifier until you get the "feel" your looking for and your trans is happy with.
Liteweight Shockproof has friction modifiers and works really awesome in the standard gearboxes. Again if you find it too slick you can add more Friction Modifiers. My trans on Shockproof was golden, few could believe how nice it shifted for a battered stock trans without a rebuild. The current trans has Royal Purple in it and seems to be fine.

[fusionsport]

I use Redline Heavy Weight shock proof.
Not sure how it would do in a nice new trannsimission, but it was a good band-aid for my dying syncros.

Shifts good except when its real cold out... shifts really slow then untill it warms up.


WHOA!!! Heavy is like for rear diffs and t-cases lol. It doesnt have as many friction modifiers built into it but will take a LOT of abuse and heat.. Have you tried Liteweight Shockproof? Should have the same effect on the syncros and be a little easier to shift. Again you might need to add a bit of friction modifier to it, but try first and see how it feels.

[liteyouup]

Where's the bleeder hole? Maybe it's just dripping all over the sides of the tranny and seems like it's the seal....

[sbiggi]

WHOA!!! Heavy is like for rear diffs and t-cases lol. It doesnt have as many friction modifiers built into it but will take a LOT of abuse and heat.. Have you tried Liteweight Shockproof? Should have the same effect on the syncros and be a little easier to shift. Again you might need to add a bit of friction modifier to it, but try first and see how it feels.

No I havent. It was actually in th trans when I bought, and I put it back in after synthetic Mobile1 75w90 didnt work so well.

So I run Heavy Weight in everything.... and it works well for me.

I'll go with light weight when I get around to rebuilding my transmission.

[biglady112]

The vent is on the back side of the transmission above the axle seal. It is under the battery and shifter cables.

Steven

[fhudsonjr]

If you are interested in trying Amsoil, I sell Amsoil down here in Aurora .

I have Amsoil's new manual transmission and transaxle gear lube.

Fred

[KeltonDSMer]

There is also an Amsoil dealer here in boulder; Broadway Automotive in between foothills and 55th on arapahoe.

I find a quart of penzoil syncromesh and the rest 75W90 Amsoil works the best of anything I tried. Their synthetic GL-4 75W90 I tried worked well but it lost its viscocity in only about 5000miles which I would have not expected. I switched back to the previously mentioned combo and it works quite well.

[liteyouup]

What kind for the transfer case?

[DlandryTSI]

You can use the same fluid in your transfer case.

--Dave

[v413nc3]

The best stuff I have found for the tcase and rear diff is redline heavyweight shockproof.