which atf in my getrag 6 speed

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gregester

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i have a caliber srt-4, which have a getrag 6-speed tranny and mopar calls for atf+4 in this manual. some guys run mt fluid, but then voids the warranty.

so, im running amsoil atf at the moment, instead of the factory fill of mopars atf+4.
would you say amsoil atf is pretty much as good as it gets, or try something else to help smooth out the notchyness.....maybe redline atf, i switched the oil to rl and love it so far.
the amsoil definitly helped over the mopar thou.
 
I have never driven one, but I've read that the transmission is pretty notchy, and not the best shifting trans. What do you think of it?

Amsoil ATF is very, very good fluid. I'd be curious to see what Getrag actually specd for it. I'm sure it would be something like m/dII but Chrylser uses their +4 fluid in everything.

Don't quote me on this, but I *think* there are some fluids out there such as Amsoil Synchro Mesh, and maybe Redline MTL which are pretty darn close in viscosity to ATF. I know that redline used to recommend MTL for transmissions that called for ATF, but I don't know if they still do that since they came out with their D4 fluid.
 
you can try a mix of 1/2 Redline C+ATF and 1/2 MTL. That will be my next fill in my Neon SRT-4. I like the less notchy feeling I get with the Redline C+ATF over the Amsoil ATF. A well known and highly respected member on this site recommended I try the 1/2 and 1/2 mix in my manual 5 speed, as he feels ATF4 alone is not enough for my T850, or any manual tranny for that matter
 
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i actually blew the first tranny with only 8000 miles on it...well it started making noise then and progressively got worse until it was replaced at 18000 miles.
had amsoil in it.....but not at all blaming it.
 
From what I hear, ATF +4 is a somewhat oddball spec. I would not use any oil that isn't explicitly made for that spec.

Can't say whether Amsoil is the best, but their transmission fluids are pretty awesome in general. I doubt you can get much better than that.
 
after looking back at my PM's, the member said, "ATF doesnt have enough EP additives for manual transmissions. You should try a 50/50 mix of C+ATF and MTL."

If it wasnt a private message, I would post his name. He is probably one of the top 3 most knowlegable members on this site.
 
With carbon/paper synchros, trannys don't like thick oils, in general.
But Redline MTL or Amsoil's synchromesh version are not much thicker than ATF. And they are real gear oils with superb qualities.
I'd use either one straight before a 50/50 mix. You might as well get the full benefits.
 
I'm on my 3rd "try" in an '09 Jeep with a 5speed manual tranny.

The factory fill ATF+4 was junk, so I tried RL C+ with only a moderate improvement.I'm now on Amsoil ATF with the best results so far. Smoother shifts and reduced notchiness.

Was going to try RP Synchromax, but a prior post here changed my mind.
 
Originally Posted By: mechtech2
With carbon/paper synchros, trannys don't like thick oils, in general.
But Redline MTL or Amsoil's synchromesh version are not much thicker than ATF. And they are real gear oils with superb qualities.
I'd use either one straight before a 50/50 mix. You might as well get the full benefits.


Kinda bringing up an old thread, but why/how can you say RedLine's MTL is not much thicker than an ATF? ATF seem to be water thin on paper, when compared to a 70w-80 oil.
 
im still running amsoil atf in my 6 sp manual, but i know from the factory it come with an additive.....being a modifier of some sort.
i know if i put mtl in it the factory warranty will be voided, but if it will improve the shifting at high rpms it will be worth it.
the tranny (2nd one) only has 5,000 miles on it and i put amsoil atf the day i got it back from the shop.
i was racing a 347 stroker mustang and i couldnt get the car to shift into 3rd on 2 different times. normal shift are butter smooth thou. do you think amsoil or redline mtl will fix this?
 
I just threw in Pennzoil Syncromesh into my trans, which calls for the same exact fluid set up as yours (ATF+4 and 4 oz. of Mopar Limited Slip Additive) and noticed quite a noticeable difference. It was cheap, and I figured it wouldn't hurt to try. (Around $22 w/tax for 3 quarts.) The Pennzoil Syncromesh is a Chrysler approved fluid for certain manual trans (along with GM as well), and is just a tad bit thicker than ATF+4.

I was told Mobil 1 High Mileage 10W-30 or 10W-40 is GREAT (High zinc content) for the New Venture Gear Trans, but I'm not sure if it will do as well in the Getrags. There are numerous guys running M1 HM 10W-30 changing them at year intervals and have nothing but great results.

Out of curiosity, does anybody know what the synchros in the the Getrag SRT4 Caliber trans are made out of? Reason why I'm asking is that there is pretty good evidence out there that the FM in the T-350 and T-850 trans from NVG literally eat up the blocker ring material in these transmissions after the fluid breaks down.
 
I have a 5 spd Getrag in my PT GT.

It too came with ATF+4. I changed that a couple times then switched to Amsoil ATF which I think was somewhat better. Note I change it once a year anyway. Last 3 years have run the Amsoil MTF fluid which is much better, no problems at all.

Does you FSM indicate just ATF+4?? The T-350 got friction modifier with the ATF+4 but I have no idea why since the Quaiffes in those are not clutch type limited slips. I have older Getrags A555 and A568 in my Shelby Dodges and I run the Amsoil MTF in them even though orignally they came factory with either AT or 5w30 engine oil. I also use 5w30 and 0w-30 in them prior to the MTF coming out. I ahve one pushin 300K miles and it runs fine.
 
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Originally Posted By: VNTS
The T-350 got friction modifier with the ATF+4 but I have no idea why since the Quaiffes in those are not clutch type limited slips.

For the synchros maybe?
 
Supposedly, the FM was added to the ATF+4 because some minor sounds were heard from the trans in hard cornering/turning. Quaiffe was contacted and they said for sure there is no FM required for their LSD, and New Venture Gear said that no FM was required for their trans. It was Chrysler who made the decision to put it in as a "band aid" fix for something...but in all actuality is causing more problems that with it not being there.
 
Originally Posted By: d00df00d
Originally Posted By: VNTS
The T-350 got friction modifier with the ATF+4 but I have no idea why since the Quaiffes in those are not clutch type limited slips.

For the synchros maybe?


No, the standard Neons and PTs come with just plain old ATF+4, nothing specail needed for the synchros or those too would have the LSD additive.
 
Philth - Trans oil is not rated like engine oil.
Engine oil is rated at 212 deg F, and gear lube at 150 deg F.
So an 70-80 gear oil is like a 5-30 motor oil [not exact].

But you go on to post that you use Pennzoil Synchromesh, which is very similar?
 
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