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#1392406 - 03/04/09 09:41 AM Re: Synchromesh Manual Transmission Lubricants [Re: Taylor]
deeter16317 Offline


Registered: 12/07/07
Posts: 1339
Loc: SE, PA
 Originally Posted By: Taylor
I dumped my ATF for some RP synchromax the other day no noticeable differences yet. NP242 (T/C)



I have 178k on my 04.5 with the NP271...been running synchromax since 50k...actually shifts better than with ATF. My NV5600 hates the thinner Synchromax, and responds best to Redline MTL.

I believe the older bottles of Synchromax indicated you could run it in place of ATF in manual gearboxes and transfercases.
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#1393070 - 03/04/09 07:14 PM Re: Synchromesh Manual Transmission Lubricants [Re: deeter16317]
unDummy Offline


Registered: 02/01/03
Posts: 8756
Loc: RI
With a mechanical xfer case requiring atf, a quality mtf/mtl can only be an improvement. With the amount of wear that I've seen in some xfer cases, I just don't understand why an ATF was required, MPG or wear?

How soon we forget? One of the original MTFs was the BG syncroshift. Torco also has an MTF.
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#1399694 - 03/11/09 01:28 PM Re: Synchromesh Manual Transmission Lubricants [Re: unDummy]
MolaKule Offline


Registered: 06/05/02
Posts: 14642
Loc: Midwest
Have you seen any better wear with the Versatrac fluids? A lot of GM TC's use them.
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#1404721 - 03/16/09 10:13 AM Re: Synchromesh Manual Transmission Lubricants [Re: MolaKule]
MolaKule Offline


Registered: 06/05/02
Posts: 14642
Loc: Midwest
Or AutoTrac fluids as well?
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#1406337 - 03/17/09 07:25 PM Re: Synchromesh Manual Transmission Lubricants [Re: MolaKule]
unDummy Offline


Registered: 02/01/03
Posts: 8756
Loc: RI
Don't forget that Autotrac was the bandaid for the shudder caused by DexronIII, which is what those TC's were original filled with.

Concerning versatrac, I haven't seen any in the shop. But, since most are under warranty, I expect that most failures will be cared for by the dealer.

BTW, a real TC, IMO, doesn't use clutches. I'll take a gear'd xfer case with mechanical manually shifting any time. And, ALL that I've seen that failed were usually lubed related failures, that can be prevented.
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#1406361 - 03/17/09 07:40 PM Re: Synchromesh Manual Transmission Lubricants [Re: unDummy]
MolaKule Offline


Registered: 06/05/02
Posts: 14642
Loc: Midwest
Me too, I prefer the older chevy Burbs with the gas piston in the front diffy and the gearshifting TC, but these AUTO 4 Wheel drive Transfer cases (as in my '08 TrailBlazer) are really nice on icy and snowy roads.

I recommend changing the TC fluid after a tough winter.


Edited by MolaKule (03/17/09 07:41 PM)
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#1407583 - 03/18/09 09:35 PM Re: Synchromesh Manual Transmission Lubricants [Re: MolaKule]
wannafbody Offline


Registered: 01/02/08
Posts: 895
Loc: PA
I've heard of some issues with with RP synchromesh fluid in T56s.
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#1411098 - 03/22/09 10:34 AM Re: Synchromesh Manual Transmission Lubricants [Re: wannafbody]
Bror Jace Offline


Registered: 05/27/02
Posts: 4878
Loc: Saratoga, NY
What issues with RP Syncromax in manual transmissions? I'm not a fan of the brand, but I figure it's gotta be better than ATF in those units that spec ATFs and no one makes a comparable fluid that I know of.

Mola, you don't recommend RP Syncromax for manual transmissions and transfer cases that spec ATFs? Please PM me if you think your answer will start trouble. ;\)


Edited by Bror Jace (03/22/09 10:34 AM)
Edit Reason: punctuation
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#1411381 - 03/22/09 04:49 PM Re: Synchromesh Manual Transmission Lubricants [Re: Bror Jace]
MolaKule Offline


Registered: 06/05/02
Posts: 14642
Loc: Midwest
No problem. It's that I have never had any experience with it nor run comparisons against other lubes.
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#1477412 - 05/26/09 05:50 PM Re: Synchromesh Manual Transmission Lubricants [Re: MolaKule]
kballowe Offline


Registered: 10/26/05
Posts: 996
Loc: East Central Missouri
Hmmmmmm. The kid just changed the lube in the manual tranmission in his '01 Miata due to a torn boot and some amount of leakage...... M1 75W-90 "LS".

He claims that it doesn't shift nearly as well as it once did.....

Now we know why.

Thanks

Is this a great forum or what ???

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#1480305 - 05/29/09 07:52 AM Re: Synchromesh Manual Transmission Lubricants [Re: kballowe]
cven Offline


Registered: 07/24/08
Posts: 277
Loc: ohio
From what I understand some 6-speeds have paper (cellulose) syncros and most synthetic oils do not work with the paper very well. (It may eat them up) I can't recall what years and such have the paper syncros but in my 2000 z-28 6-speed (paper syncros from what I could find out? YMMV) I put pennzoil dex-III (dino) in it and what I drained out (FF) sure looked like dex-III to me.

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#1497199 - 06/12/09 11:24 PM Re: Synchromesh Manual Transmission Lubricants [Re: cven]
AdRock Offline


Registered: 06/05/09
Posts: 727
Loc: Texas
There was a thread on Stangnet that went for tons of pages. It's still there to read. There were problems with the 1-2 shift in the TR3650's. After a good while some Tremec engineers finally came in and gave some info.

Apparently the GM SynchroMESH is not good for the Tremec trannies. However they said that SynchroMAX was ok to use. They also said to drop the capacity from 3.9 qt. to 3.2. This is some stuff that Ford really never bothered to tell anyone.

I believe the same MESH vs MAX difference also applies to the T56.
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#1679393 - 11/20/09 10:40 PM Re: Synchromesh Manual Transmission Lubricants [Re: AdRock]
hooligan24 Offline


Registered: 09/05/07
Posts: 903
Loc: wa state
how about mixing 50/50 ATF and MTL for a manual trans that specs ATF4? it would make a slightly thicker viscosity and also add in some EP additives. I will try to get ahold of Dave at RL to see what he says about mixing their different fluids...
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#2701321 - 07/31/12 10:03 PM Re: Synchromesh Manual Transmission Lubricants [Re: MolaKule]
MolaKule Offline


Registered: 06/05/02
Posts: 14642
Loc: Midwest
Bump for the people with Ford DCT's.
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#2813685 - 11/25/12 02:16 PM Re: Synchromesh Manual Transmission Lubricants [Re: MolaKule]
MolaKule Offline


Registered: 06/05/02
Posts: 14642
Loc: Midwest
GL-4 is a level of protection rating for gears and is generally applied to manual transmissions and to manual transaxles that do not have hypoid designs.

The older formulations in GL-4 MT lubes had about 1200 to 1500 ppm of phosphorous and zinc or ZDDP as the primary Anti-Wear additive. Some simply contained a lower level of phosphorous-sulfur EP additives like those used in differential (GL-5) lubes.

GL-4 MT lubes don't need a strong EP additive level like the phosphorous-sulfur EP levels in a differential lubricant because of the type of gearing and gear-tooth loading.

If you care to read the White Papers you will see that gear lubes, whether GL-4 or GL-5, have more than just Anti-Wear (AW) or Extreme-Pressure (EP) additives.

ALL Gear lubes contain anti-rust, anti-foam, and Metal Deactivator chemistries.

Metal Deactivator chemistries are chemical compounds that keep an additive component or contaminant from reacting with metals in the gear box.

The important thing to keep in mind about the Specific Application GL-4 MT lubes is that they contain the proper friction modifier chemistries to assist with better shifting and synchro engagement.

Personally, I relegate GL-5 rated lubes to hypoid differentials only.
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