To GM Synchromesh It or Not?
To GM Synchromesh It or Not? Guys,
I need your opinions and advice. My cars got 21K miles on it and Im not 100% sure that the fluid has ever been replaced in my t56.
I was wondering if its a good idea to go flush it and change the fluids with GM synchromesh?
Any advice is greatly appreciated
I need your opinions and advice. My cars got 21K miles on it and Im not 100% sure that the fluid has ever been replaced in my t56.
I was wondering if its a good idea to go flush it and change the fluids with GM synchromesh?
Any advice is greatly appreciated
Joined: Nov 2003
Posts: 6,216
Likes: 236
From: Wichita KS / Rancho San Diego
The label on your trans says to use Dexron III. I changed mine out at 80,000 mi with Mobil 1 syn ATF. Didn't like it and decided just to follow the instructions.
I tried synthetic a while back and immediately had shifting problems. Went to Walmart and bought Supertech brand ATF, or whatever it called for. It has been flawless for 20k miles.
Don't use anything other than ATF in a T56. It was designed for that fluid, not Synchromesh. Everything from the seals to the blocker rings were engineered to work with ATF.
I use Mobil 1 Synthetic ATF and it works well.
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Basically. Same thing goes for engine oil, coolant, and clutch fluid.
Right now I have Penzoil Syncro in my trans...and Ill be switching back to regular old DEX III to see if makes a difference.
Guys from Tick recommend regular old DexIII and they use that in their quick cars...so thats good enough reasoning for me to try it again.
J.
Right now I have Penzoil Syncro in my trans...and Ill be switching back to regular old DEX III to see if makes a difference.
Guys from Tick recommend regular old DexIII and they use that in their quick cars...so thats good enough reasoning for me to try it again.
J.
No, GM uses ATF in the T56. It says right on the side of the case, "Dexron III Fluid Only".
Don't use anything other than ATF in a T56. It was designed for that fluid, not Synchromesh. Everything from the seals to the blocker rings were engineered to work with ATF.
I use Mobil 1 Synthetic ATF and it works well.
Don't use anything other than ATF in a T56. It was designed for that fluid, not Synchromesh. Everything from the seals to the blocker rings were engineered to work with ATF.
I use Mobil 1 Synthetic ATF and it works well.
http://www.pzlqs.com/Tech/Pdsheet/Do...omeshFluid.PDF (Synchromesh)
http://www.pzlqs.com/Tech/Pdsheet/Do...ssionFluid.pdf (ATF/Dexron III)
http://www.stealth316.com/2-pennzoil-synchromesh.htm (More research data)
http://store.summitracing.com/partde...t=nal-12345349 (link to buy GM Synchromesh)
High performance oil for your Tremec manual transmission.
GM Performance Parts Synchromesh transmission fluid is designed for GM manual transmissions and is the recommended lubricant for all Tremec brand manual transmissions. It has been formulated with a partially synthetic base for excellent lubrication properties and does not break down after time. GM Performance Parts Synchromesh transmission fluid can withstand high temperatures as well as cool, low temperatures.
Not saying ATF is bad, not saying NOT to use it but you can use this with confidence.
My trans shifts better with this then 20k stock fluid. Much more noticeable smooth shifting in cold weather. The added bonus is that GM fluid is near 20$ per quart vs 5$.
I put Pennzoil synchromesh in my car which is supposed to be the same thing as GM synchromesh. My car had 40k miles when I did this. No issues after new fluid was put in. I would say go with pennzoil syncromesh, can be had at an auto parts store for cheap.
If you go to a Dealer, its the same fluid, Pennzoil Makes it. That works fine as well.
High performance oil for your Tremec manual transmission.
GM Performance Parts Synchromesh transmission fluid is designed for GM manual transmissions and is the recommended lubricant for all Tremec brand manual transmissions. It has been formulated with a partially synthetic base for excellent lubrication properties and does not break down after time. GM Performance Parts Synchromesh transmission fluid can withstand high temperatures as well as cool, low temperatures.
Not saying ATF is bad, not saying NOT to use it but you can use this with confidence.
My trans shifts better with this then 20k stock fluid. Much more noticeable smooth shifting in cold weather. The added bonus is that GM fluid is near 20$ per quart vs 5$.
High performance oil for your Tremec manual transmission.
GM Performance Parts Synchromesh transmission fluid is designed for GM manual transmissions and is the recommended lubricant for all Tremec brand manual transmissions. It has been formulated with a partially synthetic base for excellent lubrication properties and does not break down after time. GM Performance Parts Synchromesh transmission fluid can withstand high temperatures as well as cool, low temperatures.
Not saying ATF is bad, not saying NOT to use it but you can use this with confidence.
My trans shifts better with this then 20k stock fluid. Much more noticeable smooth shifting in cold weather. The added bonus is that GM fluid is near 20$ per quart vs 5$.
Synchromesh was basically formulated as a better alternative to motor oil or gear oil. Its not designed to replace ATF, they are very different formulas. Quoted directly from your source:
"A post on the message board at www.oilanalysis.com found Synchromesh to consist of a 5W30 non-detergent oil with a friction modifer and an EP (extreme pressure) additive. It is made under contract for General Motors by Pennzoil (APC 3378) or by Texaco (Code 1874 MTX Fluid)."
A non-detergent 5W-30 oil definitely not the same as ATF. As everyone knows, ATF is a strong detergent formula.
Bottom like is the transmission was engineered with ATF as the only lubricant. Meaning the bearing tolerances, blocker ring materials, gear tolerances, and seals were all designed for ATF, not anything else.
I'm not saying Synchromesh doesn't work - I know it does, and many people are happy with it. I'm just saying I'd rather stick to what the manufacturer of the transmission reccommends, because you don't really know the long-term effects of using the improper fluid.
On The Tree
Joined: Jan 2007
Posts: 130
Likes: 0
From: perryton tx
i know in large industial allisons you can use atf or 15-40 for diesels (i believe it is non detergent or low detergent). i also know gas engine motor oil in a four wheeler will load up your friction disks and burn up your clutch. (i get to get a new clutch for mine)
also you will find it says mercron/ dextron lll on the bottle. also know that ATF3 is NOT the same as mercron/dextron lll
also you will find it says mercron/ dextron lll on the bottle. also know that ATF3 is NOT the same as mercron/dextron lll