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GM Synchromesh # 12345349 cost over $20 a bottle
Pennzoil #7161193501 cost $8 at the parts store, same stuff made by the same company. Dwight
Would be interesting know if the Penzoil stuff really is exactly the same as the GM branded stuff. When I picked up my TKO600 last year from a Tremec Elite distributor (Liberty's in Taylor, MI) the guy was adamant that I only use GM branded product and not any other. Found that the GM Synchromesh #12345349 is actually now ACDelco #88900333. Couldn't find at any local stores, but only around $13 quart at Summit. Added to an order and didn't look back. About a $15 premium for a $2300 trans. Easy decision.
 

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I visited the Ashland Oil lab last summer in Lexington Ky. They make products for everyone.

Dwight

some of their products




 

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Hi Guys,

I know this is a bit old thread and sorry to bring it up again.

for some reasons I couldnt find the above mentioned Oil. some shops told me that this one is the same (12346190 FLUID). So, my question is is it?

Thanks
Hakeem
 

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DWIGHT yes they produce for a lot of brands but I believe that the formulas are different as per the manufacture's specs.

Just like Rousch Heads are cast by World products. Kelly tires a division of Goodyear. Etc.
Just saying .

Kenny
 

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Hi Again,

Ok I know its a different oil but for some reasons no one has the synchromech oil in here. so as an alternative I will choose this one (TRANSTEC 85W90 / 85W140) any thoughts?

btw, its too hard to import liquids here so shipping is not an option.

Thanks
Hakeem
 

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is it cheaper to import the parts to repair your transmission?

You need to find the correct fluid.

Dwight
 

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Hi Again,

Ok I know its a different oil but for some reasons no one has the synchromech oil in here. so as an alternative I will choose this one (TRANSTEC 85W90 / 85W140) any thoughts?

btw, its too hard to import liquids here so shipping is not an option.

Thanks
Hakeem
Any GM dealers there? Might be able to get their Friction Modified Synchromesh Manual Transmission additive or full bottles over the parts counter.

88900399 - GM/AC Delc Synchromesh Manual Transmission Fluid- Friction Modified is the new number. The key is not the oil itself but the "friction modified" part. Its an anti foaming agent & improves shear strength. Weight is 75W90.

Acura & Honda were slipping it into their MT's that were coming in for hard shifting service problems.
 

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Hi Again,

Ok I know its a different oil but for some reasons no one has the synchromech oil in here. so as an alternative I will choose this one (TRANSTEC 85W90 / 85W140) any thoughts?

btw, its too hard to import liquids here so shipping is not an option.

Thanks
Hakeem
No, No, No! 85w140 is way too thick and will damage the 200+ tiny needle bearings in that transmission. You would be safer using just plain old straight 30w motor oil than that heavy gear oil stuff. It will be thin enough for the needle bearings and the bronze synchro rings won't care.

Hmm, actually, Mobil-1 Synthetic ATF or Mercon-V ATF whould work for it as well. The synchromesh is ideal and should be found if possible.

Stan
 

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is it cheaper to import the parts to repair your transmission?

You need to find the correct fluid.

Dwight
:(:(:(:( No its not. but I couldnt find it :yawn:. I started to get the feeling that the car agencies do that on purpose so you keep changing your transmission :eek:.

Any GM dealers there? Might be able to get their Friction Modified Synchromesh Manual Transmission additive or full bottles over the parts counter.

88900399 - GM/AC Delc Synchromesh Manual Transmission Fluid- Friction Modified is the new number. The key is not the oil itself but the "friction modified" part. Its an anti foaming agent & improves shear strength. Weight is 75W90.

Acura & Honda were slipping it into their MT's that were coming in for hard shifting service problems.
Thanks Kevin. I will try to go there and check if they can place an order for me. I checked with them and they suggested this thick oil. they say it will work.

No, No, No! 85w140 is way too thick and will damage the 200+ tiny needle bearings in that transmission. You would be safer using just plain old straight 30w motor oil than that heavy gear oil stuff. It will be thin enough for the needle bearings and the bronze synchro rings won't care.

Hmm, actually, Mobil-1 Synthetic ATF or Mercon-V ATF whould work for it as well. The synchromesh is ideal and should be found if possible.

Stan
Stan thanks for the tip. I will try to find these oil. I believe I can use them till I figure out how I can bring these ones.


Thanks all
Hakeem
 

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Hi Guys,

Was just wondering. What cars brand and years was this synchromesh oil? I mean was it specific for certain cars??

Thanks
Hakeem
 

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Its a GM product for all newer GM MT's. Older ones not sure how far back they changed used W90 gear oil.

Last trans rebuilds I did were old Muncie Rock Crusher 4MT's so that's where my trans oil experience ends till the Cobra.

My '06 Acura TL was temporarily patched in '07 with the GM oil swap till Honda rebuilt it under TSB warranty. They eventually copied the GM oil as the factory fill. So it has very wide applications in the newer transmissions.
 

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Direct from Tremec FAQ:

Yes I know this is an old thread. Just wanted to update what I found on fluid part number. Direct from Tremec FAQ:

Q: What type of fluid does TREMEC recommended?

A: For all TKO 5-speed models, TREMEC recommends GM Synchromesh™ (GM Part # 88861800) – or equivalent, or Mobil 1 Synthetic ATF. For all other aftermarket models we recommend Dexron III ATF

FAQs

$6.75 qt from Summit. It no longer says Synchromesh on the bottle but I've got to believe this is what Tremec wants you to use now. Why all the different part numbers threw the years, and now no longer says Synchromesh on the bottle, I don't know. Maybe someone can enlighten me.
 

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My TKO-600 manual shows the old fluid part no. of GM 12345349 which is a discontinued part number. The new part number is GM 88900333, which is what I have in now.
X2. ACDelco (GM) 88900333 is what I've used in my last two TKO builds. Available at Summit, JEGS, Tasca Parts, etc.
 

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I was dumb enough to buy it at the dealer at $20.00 a qt.
JR
 

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***UPDATE***
Bringing up an old thread
I just purchased ACDELCO #88900300 for my TKO600 because it's labeled Syncromesh Transmission Fluid. BUT what caught my eye was it also says Friction Modified!!! So I drained all 84oz. out.

I went to the Tremec website and the fluid they recommended for ALL TKO 5-speeds is #88861800 so I bought 3 quarts. I just came in the mail and I was ready to put it in when I noticed that nowhere does it say Syncromesh on the bottle, Just Manual Transmission and Transfer case fluid. WTH

OK that's enough.. I called TREMEC and explained my issue. The tech person looked into it and admitted it's not labeled clearly and he understood the confusing but told me to use #88861800 as stated on the website.
FWIW guy's I'm dumping it in, or am I just more confused??!! any more thought's?
 
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