2003 6-speed lubricant
Thread Starter
Burning Brakes
Joined: Aug 2011
Posts: 1,160
Likes: 113
From: Vancouver Island
2003 6-speed lubricant
i was thinking of changing my trans oil this winter while my Vette is off the road for the winter. i wanted to use the GM part # 88861800 as per some recommendations from forum members in the know. keep in mind I live in Canada, so i called my local dealer and they can't find any such part #? so is there a US to CDN part # change that anyone on here knows of? if not, what would be best? i'd like to try something synthetic. right now the oil is only a few thousand miles old but when the car is cold its hard shifting and a little "crunchy" is the way i would describe it, once warmed up it shifts good.
thank you,
thank you,
Instructor
Joined: Oct 2016
Posts: 143
Likes: 31
From: Indiana
I believe the GM fluid is mineral based, not synthetic. This is another hot topic with many strong feelings one way or another. For synthetic you can consider Redline, Amsoil, or Mobil 1 ATF. Make sure it meets Dexron III specs.
Last edited by 01pewtervert; Oct 22, 2018 at 09:04 PM.
Thread Starter
Burning Brakes
Joined: Aug 2011
Posts: 1,160
Likes: 113
From: Vancouver Island
Mobil 1 ATF sounds interesting.
Team Owner
Joined: Mar 1999
Posts: 22,025
Likes: 192
From: At the beach in little Rhody
That part number is actually the old Dextron III transmission fluid and meets your requirements. Many have said this fluid shifts better than synthetic but I have not used it myself.
Melting Slicks
Joined: Aug 2016
Posts: 2,448
Likes: 160
From: JARRELL TEXAS
After talking to the Allison engineer that spec'd and approved OEM's I used Transynd 295 in my 6 speed Tremec 6060 I had in my Dodge Hemi. I also used it in my 83 Monte Carlo 350 auto as it is backward compatible to Dex III.
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
AMSOIL makes a very good ATF that works excellent in ALL of the C5 MN6/MN12 gear boxes. It is compatible to the early MN6 and late MN6/MN12 gear boxes.
TORQUE DRIVE Synthetic ATF (ATD) . Just google AMSOIL Torque Drive and there are pages on the product. I run it in my 02 ZO6 when it was an MN12. Changed it to a MN12 / T60/T60 conversion and it performs excellent in that configuration also.
TORQUE DRIVE Synthetic ATF (ATD) . Just google AMSOIL Torque Drive and there are pages on the product. I run it in my 02 ZO6 when it was an MN12. Changed it to a MN12 / T60/T60 conversion and it performs excellent in that configuration also.
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Melting Slicks
Joined: Jun 2013
Posts: 3,473
Likes: 691
From: West Virginia
All it needs (per the people at Tremec) is a lubricant which meets the "old" GM DEX III spec. Plenty of choice in the parts stores. I used Valvoline DEX/Merc - labelled for GM cars requiring DEX III, which IIRC was less than $20/gallon jug from the local Walmart.
Thread Starter
Burning Brakes
Joined: Aug 2011
Posts: 1,160
Likes: 113
From: Vancouver Island
Melting Slicks
Joined: Jun 2013
Posts: 3,473
Likes: 691
From: West Virginia
One word of warning. There have been reports of people being told that they should use DEX VI instead of DEX III, as it is "the replacement". DEX VI is STRICTLY for automatics. GM bulletins warn that it can lead to failure if used in manual transmissions.
Thread Starter
Burning Brakes
Joined: Aug 2011
Posts: 1,160
Likes: 113
From: Vancouver Island
Originally Posted by jackthelad
One word of warning. There have been reports of people being told that they should use DEX VI instead of DEX III, as it is "the replacement". DEX VI is STRICTLY for automatics. GM bulletins warn that it can lead to failure if used in manual transmissions.
she's off the road for the winter so I'll have to report back in the spring 