better fluid to use for the t850

stairmaster3001 · Post by **stairmaster3001** » Tue Jan 03, 2012 9:23 pm

hey guys thought id share this for the t850 owners...
http://www.youtube.com/watch?v=m_toEAYSOB0

its better to use mobil 1 high mileage 10w-40 motor oil in t850 trans.
dont use atf4. i did this in my car and my friends and both crunched 3rd and it doesnt crunch anymore !

darthroush · Post by **darthroush** » Tue Jan 03, 2012 11:58 pm

There's a rather lengthy thread somewhere on here about M1 HM in the T850. Consensus is it seems to work better.

JeffM · Post by **JeffM** » Wed Jan 04, 2012 9:46 am

Ed Peters is awesome to listen to. The guy knows so much concerning drivetrain. I've listened to the part about the Mobil 1 before, but somehow missed the part about the shift forks and syncro rings. Kinda makes you more nervous about the T850.

Hudson_Neon · Post by **Hudson_Neon** » Wed Jan 04, 2012 10:34 am

haha, funny thing is that i just watched this last night as well and was considering posting it up some time today

Donkeypuncher · Post by **Donkeypuncher** » Thu Jan 05, 2012 4:12 pm

So does the same apply to the t-350? He never specifically mentions the t-350 for some reason.

darthroush · Post by **darthroush** » Thu Jan 05, 2012 4:18 pm

Should

Hudson_Neon · Post by **Hudson_Neon** » Thu Jan 05, 2012 5:04 pm

98% of what he says applies to the t350

JeffM · Post by **JeffM** » Thu Jan 05, 2012 6:49 pm

Hudson_Neon wrote:98% of what he says applies to the t350

Well, technically. But he has a T850 up on the table.

Donkeypuncher · Post by **Donkeypuncher** » Thu Jan 05, 2012 10:05 pm

This has me debating on whether I should change the fluid in my t-350 again. The pennzoil synchromesh has been working great, but that info about the synchro materials wearing down uber fast with the wrong lube has me concerned.

Might as well do it, it's a pretty cheap price for peace of mind.

stairmaster3001 · Post by **stairmaster3001** » Thu Jan 05, 2012 10:33 pm

yeah my gears are out right now lol my 2nd and 3rd gear blocker ring and fiber material are gone...i got some pics ill post up when im done. im going to getthe snap rings tomorrow and have my shit rebuilt

darthroush · Post by **darthroush** » Fri Jan 06, 2012 2:37 am

OB has been running M1 HM in his 5 spd. for some time now with no issues. I'm not too sure what would be that different between the T-350 and T-850 that the oil wouldn't work in one or the other.

LowNSlow · Post by **LowNSlow** » Fri Jan 06, 2012 5:01 am

I ran M1 HM in my old SRT-4.....no issues.

Donkeypuncher · Post by **Donkeypuncher** » Wed Jan 18, 2012 5:29 pm

I did a little research and found that pennzoil synchromesh has a slightly higher level of zinc/phosphorous than the mobil 1 HM. I was gonna swap, but I think I'm safe with the synchromesh.

Haven't had any trans problems yet, but I wonder how much damage was done running atf for 80k miles.

chipdogg · Post by **chipdogg** » Wed Jan 18, 2012 8:12 pm

It's not just about the ZDDP levels. Too much and it become acidic. Also have to think about the fibrides on the synchronizers. The ZDDP only deals with metal shear, when the teeth are sliding against each other. The fibrides on the synchronizer stop rings need the right viscosity fluid. The OE Mopar fluid (the $20/qt stuff) is ~5w-30 to 10w-30, as is ATF, but the Mopar stuff has the right quantity of ZDDP in it.

No need to add anything to the HM Mobil 1 fluid, and it's a good low-cost fluid for the Neon 5-speed transmissions. T-350 and T-850.

Info is straight from Ed Peters, we talk almost daily about transmissions.

Donkeypuncher · Post by **Donkeypuncher** » Thu Jan 26, 2012 8:09 am

What has me curious is what he says at 6:50 about older brass synchros. Then the video cuts like they edited out Ed talking about the t-350, would have liked to hear what was said.

Hudson_Neon · Post by **Hudson_Neon** » Thu Jan 26, 2012 8:37 am

the t-350 doesn't have brass synchros though. the internals are almost identical. he was talking about transmissions like the old muncie m20's and such

Donkeypuncher · Post by **Donkeypuncher** » Thu Jan 26, 2012 12:38 pm

That makes sense then, I got confused because our 1st and 2nd have brass synchros. The other syncrhos are fiber material so I get it now.

chipdogg · Post by **chipdogg** » Thu Jan 26, 2012 8:25 pm

Early 95's and such had brass 1-2 stop rings. Now all are fibride.

T-350's.

2005.Neon.SXT · Post by **2005.Neon.SXT** » Thu Jan 26, 2012 11:44 pm

I run Mobil 1 10-30 HM in my trans, been almost a year and no problems. Something I'm going to do every year along with plugs and seafoam. Can't hurt.

Only time I have problems with my trans is first thing in the morning when I start it up. First just takes a bit more to get into.... As if there's no fluid on the gears. Other than that, it's been working great.

chipdogg · Post by **chipdogg** » Fri Jan 27, 2012 7:24 am

Fluid doesn't get splashed up until the differential turns, so basically once the car starts rolling. During the winter it's also a bit thicker when cold.

JeffM · Post by **JeffM** » Fri Jan 27, 2012 7:52 am

Great info in this thread, guys.