What tranny fluid for SRT-4?

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Adam G
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What tranny fluid for SRT-4?

Post by Adam G » Sat Mar 14, 2009 6:58 pm

so I had to pull an axle.....what tranny fuild do I have to use? dont have my manual....looks to be atf
Last edited by jimbo in MI on Fri Mar 02, 2012 11:29 pm, edited 2 times in total.
Reason: changed title to better clarify topic
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Re: what tranny fuild

Post by xJoshxx » Sun Mar 15, 2009 7:41 pm

Pretty much ANY mopar Is ATF+4 and ATF+4 only.

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Re: what tranny fuild

Post by Adam G » Mon Mar 16, 2009 6:25 pm

I know the 1st gens run the mopar tranny fuild.....then I know that chrysler switched over to atf in the mtx...but wasnt sure what tranny fuild the t-850s use
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Re: what tranny fuild

Post by rosejm » Tue Mar 17, 2009 10:30 am

Factory fill is ATF+4 with a Friction Modifier (dealership only) in the T850. Easier on the assembly line...

If you're still under warranty, ATF+4 is all you should consider. If not, others have found good results with aftermarket fill (Royal Purple, Amsoil, etc...) in both ATF and MTF formulas.

As I'm still under warranty, and with the number of Autocross/Track events I run each summer I usually flush and fill ATF+4 every 15k miles. Running strong @ 50k+
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Re: what tranny fuild

Post by Adam G » Thu Mar 19, 2009 4:47 pm

my car was way past warrenty miles and mod wise
98 intense blue r/t coupe - srt swap......sold
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04 eblue srt4 - bw rs-51 big turbo, mpx exhaust agp ds tuned
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Re: what tranny fuild

Post by JeffB#2 » Thu Mar 19, 2009 4:52 pm

rosejm wrote: with a Friction Modifier (dealership only)
really bad idea.
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Re: what tranny fuild

Post by rosejm » Fri Mar 20, 2009 7:42 pm

You preach to the choir!
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Re: what tranny fuild

Post by alpinegreenneon » Tue Apr 21, 2009 9:11 pm

A couple quotes from JeffB#2 about the additive:
http://forums.neons.org/viewtopic.php?f=48&t=323499
JeffB#2 wrote:
1HotNeon wrote:...also...Dodge sells a limited slip additive made for specifically the srt-4's with the Quaife LSD that i put in with mine as well.
bad idea. The synchros having a friction lining glued to them. That lining goes byebye after continued contact with that limited slip additive. Ask Terry, he's already posted in this thread.

That additive was a hastily chosen bandaid by folks at Chrysler (that didn't get the entire story) in an attempt to fix something where no root cause had yet to be found.
JeffB#2 wrote:re: T850 with Mopar ATF+4 fluid AND Mopar additive.

Read thru the good parts and ignore the many worthless posts in the link below. There are other things that are known that are NOT in that thread that also contribute to the premature wear of the synchros and other parts. But since people don't believe what's been written here they probably won't also believe the newer info so we'll just leave that out of the discussion. Not all "friction modifiers" are the same. They have different chemical makeups from brand to brand and intended application to intended application.

Good luck if you're using the Mopar additive in a T850 with Mopar ATF+4 fluid.

http://www.srtforums.com/forums/f213/so ... id-305196/
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Re: what tranny fuild

Post by Low-Speed » Thu Apr 23, 2009 5:58 am

I'll add a specific or two, from what I remember of some other discussions on this -
The "problem" being referenced did not happen until the 2004 models. They were making a loud "popping" sound when taking sharp corners at low speeds, in "normal" driving conditions. The assumption is that the person driving the car would see that as a problem with the car.

To be honest, I had a 74 Dodge D100, with a Posi-Track rear. It did that ALL the time. What is it? The posi-unit is so tight as to cause a bindage, and sudden slip (pop) during tight cornering (think right-hander, or u-turn.)

Therefore, in order to reduce the noise, the put the same stuff in our Trans that was used in Jeeps many years ago to solve that problem with Jeeps.

As JeffB pointed out, pertaining to what the gentleman from NVG said, this was perhaps a bit hasty, and not ultimately well thought out on the part of Chrysler. Although, with normal driving, that interval and that choice is quite likely fine.

To tell it like it is, I've used Royal Purple Synchromesh, and DCR trans fluid. To be totally honest, I don't much like DCR, but their Powershift MTF is honestly some very, very good stuff from the results I had in the car! If I were going to do a change soon, I'd be ordering more!

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Re: what tranny fuild

Post by 7angofragger » Wed Jun 03, 2009 10:17 am

so what about just like the mobil 1 atf??? any good?
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Re: what tranny fuild

Post by 7angofragger » Mon Jun 08, 2009 9:16 am

well i just ordered some Redline C+ ATF... 59 bucks for a gallon :shock:
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Re: what tranny fuild

Post by Purpose » Mon Jun 08, 2009 9:43 am

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Re: what tranny fuild

Post by Philth » Fri Oct 23, 2009 10:27 am

Amsoil ATF
RP Syncromax

I'm hearing about people using Amsoil MTF but the viscosity seems too thick, though I may try it.
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Re: what tranny fuild

Post by Philth » Fri Oct 23, 2009 10:33 am

Also hearing about people using Mobil 10W-30 High Mileage as well, though I am a little afraid to try this as my car isn't a track car.
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Re: what tranny fuild

Post by cwhits » Fri Nov 27, 2009 2:32 pm

ha its been like six months i think he already changed it :P, but +1 for amsoil atf i changed mine with it at 20k and it shifts awesome.

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Re: what tranny fuild

Post by srt41981 » Fri Nov 27, 2009 3:43 pm

i tried running penzoil syncromesh 75-90 and my trans did not like it. seemed sluggish during shifting. went back to atf-4 and trans back to normal. i flush mine often and do not use the friction modifier. it is not needed.

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Re: what tranny fuild

Post by boots89 » Mon Dec 14, 2009 10:10 pm

I'm running redline MTL in mine and I love it.
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Re: what tranny fuild

Post by Philth » Sat Dec 26, 2009 2:54 pm

Just threw in some Pennzoil Syncromesh and so far it's great; A LOT better than ATF+4 and 4 oz of FM.
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Re: what tranny fuild

Post by project03r/t » Fri Apr 09, 2010 5:03 am

Royal Purple Synchromesh :good:
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Re: what tranny fuild

Post by 05silversrt » Thu Nov 25, 2010 7:00 pm

Ive read some guys are running mobil 1 10-40, or 0-40 motor oil, havent seen any bad posts about it. im going to try that in my new transmission. They say atf is too thick, I got a friend that switched over to the 10w-40 last night drove his car, shifting felt alot easier, smoother.

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Re: what tranny fuild

Post by Purpose » Thu Nov 25, 2010 9:06 pm

Mobil 10w 40 did not fair well for my neon in colder climates. Those in warmer areas seemed to do very well using this fluid. In colder areas, Amsoil Synchromesh, Royal Purple, or Penzoil Synchromesh are the only fluids I would use. Using Amsoil Synchromesh now.

My personal opinion.
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Re: what tranny fuild

Post by theRTguy69 » Thu Nov 25, 2010 9:16 pm

Mopar atf4 and the limited slip diff friction modifier..thats what it said in my 05 manual
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Re: what tranny fuild

Post by 05silversrt » Thu Nov 25, 2010 9:34 pm

Purpose wrote:Mobil 10w 40 did not fair well for my neon in colder climates. Those in warmer areas seemed to do very well using this fluid. In colder areas, Amsoil Synchromesh, Royal Purple, or Penzoil Synchromesh are the only fluids I would use. Using Amsoil Synchromesh now.

My personal opinion.
thats why they say use 0w-40 in colder climates so thats what ill be using till winters over
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Re: what tranny fuild

Post by JeffB#2 » Fri Nov 26, 2010 3:22 am

theRTguy69 wrote: and the limited slip diff friction modifier..thats what it said in my 05 manual
And that is so wrong. New Venture Gear never knew about that until after the fact. You are shortening the life of the synchros by using the friction modifier. NVG would tell you to definitely NOT use it in any T-350, T-355 or T-850.
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Re: what tranny fuild

Post by stefan » Fri Nov 26, 2010 5:35 am

my advice would be is to go to the main stealer/dealer and buy the correct oil/fluid for the tranny. thats what i did as i was not going to chance it. yea it may cost a bit more but its better than paying out even more for a new tranny.
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Re: what tranny fuild

Post by theRTguy69 » Fri Nov 26, 2010 7:25 am

JeffB#2 wrote:
theRTguy69 wrote: and the limited slip diff friction modifier..thats what it said in my 05 manual
And that is so wrong. New Venture Gear never knew about that until after the fact. You are shortening the life of the synchros by using the friction modifier. NVG would tell you to definitely NOT use it in any T-350, T-355 or T-850.
just curious on this one jeff not meaning to thread jack here. after the fact of what? syncros failure? so put just straight atf4?
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Re: what tranny fuild

Post by JeffB#2 » Fri Nov 26, 2010 7:42 am

Don't use it at all with any fluid in a T-350 or T-850. Over time it reacts with the trans fluid and some internal parts to create a slightly acidic situation that will cause the fiberide linings on the synchros to come off. When they come off they get broken up and start to plug up oil holes and passages. When they come off shifting ability also goes away. Two-fold problem.
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Re: what tranny fuild

Post by theRTguy69 » Fri Nov 26, 2010 8:19 am

Didnt knwo that good to know :good: thanks.
Umm so if you dont use the FM is it still ok to use atf4 or what trans fluid would u recommend?
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Re: what tranny fuild

Post by srt-4boosting » Sat Nov 27, 2010 3:50 pm

I would use Amsoil ATF its good stuff.

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Re: what tranny fuild

Post by 05silversrt » Sat Nov 27, 2010 7:54 pm

If your in a warmer climate use mobil 1 10W-40 oil
If your in a colder climate use Mobil 1 0w-40 oil


1/2 the price of royal purple, ams oil, etc and does one hell of a job, guys have had it for 70,000 miles No problems.
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Re: what tranny fuild

Post by donkey punch » Sat Nov 27, 2010 8:16 pm

I always heard you should not change your Tranny fluid if your car has over 100,000 miles or something like that.... is this true? or non senses?
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Re: what tranny fuild

Post by 05silversrt » Sat Nov 27, 2010 9:19 pm

i doubt that. why wouldnt you? thats like saying dont change your oil after 100k
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Re: what tranny fuild

Post by theRTguy69 » Sat Nov 27, 2010 9:36 pm

05silversrt wrote:If your in a warmer climate use mobil 1 10W-40 oil
If your in a colder climate use Mobil 1 0w-40 oil


1/2 the price of royal purple, ams oil, etc and does one hell of a job, guys have had it for 70,000 miles No problems.
Thos already have the friction materail inthem already dont they for the LSD?
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Re: what tranny fuild

Post by 05silversrt » Sat Nov 27, 2010 11:21 pm

Im not sure all I know is what I read on the big board from when someone tried it. Went 4 k than changed it, than 12k, than 36, now he's gonna up to 70,000 miles on it with no problems. Claims since switching he's had alot better, smoother shifting. I know when o get my new tranny in that's what I'm gonna run. A friend locally has also switched to 10w-30 and said it feels much better shifting.
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Re: what tranny fuild

Post by bonestonne » Sun Nov 28, 2010 10:39 am

From experience, motor oil doesn't belong in a trans. It'll shut it up (make it quieter) for a few months, it might last you a winter (but let it warm up for at least 10 mins before driving it) but in the long run, just like FM, it'll get your trans.

As it was explained to me by a guy who rebuilt transmissions for nearly 20 years, it's like coating your gears in peanut butter, and that doesn't say squat about what it does to the bearings in there.

Also, it handles heat differently, and those itty bitty pieces of plastic on the shift forks, once they get damaged, you're done for.
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Re: what tranny fuild

Post by JeffB#2 » Sun Nov 28, 2010 11:12 am

Read up on ZDDP if you're concerned with "motor" oil in a trans. You want a high % of ZDDP. ZDDP goes down by % in most motor oil formulations when they update to the newest/latest rating. But not ALL motor oils... Start googling. Find the parts per million that's highest in the lube you choose of the correct weight. Good choices have already been mentioned in this thread. So have bad ones.
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Re: what tranny fuild

Post by NickKo » Sun Nov 28, 2010 11:15 am

05silversrt wrote:If your in a warmer climate use mobil 1 10W-40 oil
If your in a colder climate use Mobil 1 0w-40 oil


1/2 the price of royal purple, ams oil, etc and does one hell of a job, guys have had it for 70,000 miles No problems.
Just to clarify.... the *ONLY* Mobil One oil to run in these transmissions, is the High Mileage Mobil One.
Only the High Mileage variety, contains the ZDDP / zinc additives, for protecting the synchros.

I have to find out if the High Mileage Mobil One, is available in 0W-40.
I haven't seen it.....


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Re: what tranny fuild

Post by 05silversrt » Sun Nov 28, 2010 11:55 am

Yes I forgot to mention that, thanks. I have seen the 0w-40 in a local wal-mart
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05 SRT-4 Nations highest HP/TQ big wheel stock turbo 375/417 self tuned.. Sold
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14 Evo X GSR- sold
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10 Evo MR SE- current
97 neon sport- current dd

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Re: what tranny fuild

Post by Low-Speed » Wed Dec 01, 2010 5:19 am

Look, ZDDP and such aren't the largest inhibitors to a motor oil's performance in a transmission. Simply put, motor oils don't have enough anti-foaming agents to be good for a transmission. There's a post on srtfroums a while back, where they were boiling MTF's out of a race application SRT, and it wasn't temperature related, as a cooler didn't help. They thought motor oil would help - lasted less than a lap, where they were getting 45-60 mins on the MTF.

There's more than just a single additive that makes or breaks the deal. Detergent levels are much higher in motor oils than they need to be for transmissions, and the detergents used tend to pit brass/bronze based metals, like the Synchronizers...

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Re: what tranny fuild

Post by 05silversrt » Wed Dec 01, 2010 7:04 am

So than if 0w-40 it 10w-40 is bad what you you guys recommend?

Jeff what would you say to put in it?
98 Neon 2.4 Swap-Sold
05 SRT-4 Nations highest HP/TQ big wheel stock turbo 375/417 self tuned.. Sold
06 Evo IX SSL- sold
14 Evo X GSR- sold
04 Evo VIII SSL- sold
10 Evo MR SE- current
97 neon sport- current dd

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