Engine Break In - 500 mi or 1500 mi

[mfcentex]

TREMEC Transmission Maintenance – TREMEC Blog: Get Connected

tremec-blog.com

It's interesting that GM doesn't have this listed. I wonder if this is similar to the differential fluid and track use. The manual talks about changing at 1500 based on track usage, not street usage for the rear differential. TREMEC might recommend 1500 thinking that people could be pushing these transmissions hard. Does anyone that doesn't track the car change the transmission fluid that early?

My last 6MT, I changed every 30,000 miles without issues.

 

[jbawden]

If the 1,500 mile break-in is more for the rear diff than the LT4, I think I'm going to prioritize optimal operating parameters for the glorious V8 over all else. Rear diff be dammed!

 

[schernov]

https://tremec.com/wp-content/uploads/2024/11/Magnum-Service-Manual-Complete.pdf

Lists acceptable fluids. And confirms that shifting at 3-4K is recommended for smooth operation (assuming nothing is broken)[/url]

 

[FLYARMY]

I have learned that there are far and few "investment" vehicles out there. You need to be a multi-millionaire with more money than brains . The only cars that I have seen ,lately, (last 20 years) has been the Ford GT 40's. I wanted to buy one in 2005 when they were $150,000 and I figured that it was way too much money and passed. Now , they go for over $300,000. On the other hand, if you had invested $150k in the proper markets, you could potentially have even more money. Usually the rich guy buys at top dollar and as soon as he drives off the lot he has lost 20% in value. I have my Dad's 1967 Cadillac convertible. He paid $5700 for it. I have it insured for $40k. I have probably lost count on how much I have spent over the last 45 years keeping it in beautiful shape. It has its issues, but it is a driver , not a hangar queen.

 

[CT4-Venom]

Please keep big foot away from my next car!

 

[rubberduck]

TREMEC Transmission Maintenance – TREMEC Blog: Get Connected

tremec-blog.com

That article states to fill to the top, but that is not correct for the TR6060. The level should be 1/8" below the fill plug (or top off and remove about 8oz)

 

[schernov]

It seems that only GM is concerned with overfill. But Tremec is not. In the other thread I added a link to a TSB for earlier corvettes I believe which started the whole under fill. I think gm was seeing fluid leaks thru the vent under high temps and that was their best of fixing it.

 

[rubberduck]

It seems that only GM is concerned with overfill. But Tremec is not. In the other thread I added a link to a TSB for earlier corvettes I believe which started the whole under fill. I think gm was seeing fluid leaks thru the vent under high temps and that was their best of fixing it.

It appears to be an issue with ATF (not higher viscosity like the HP-MTF) as it expands as it heats up and blows out the vent. It's fine for the transmission, but who wants a mess under their car.

I think I going to try straight Redline MTL. It sits right between OEM and HP-MTF. This is one of these situations where I don't want my lube to be too slippery when things really heat up here in Arizona in the summer. - I prefer a crisper feel, even if I have to force it a little harder, over too sloppy. I've seen my trans temp get to 200F in normal city driving.

 

[schernov]

It appears to be an issue with ATF (not higher viscosity like the HP-MTF) as it expands as it heats up and blows out the vent. It's fine for the transmission, but who wants a mess under their car.

I think I going to try straight Redline MTL. It sits right between OEM and HP-MTF. This is one of these situations where I don't want my lube to be too slippery when things really heat up here in Arizona in the summer. - I prefer a crisper feel, even if I have to force it a little harder, over too sloppy. I've seen my trans temp get to 200F in normal city driving.

Given that you are in AZ - thicker fluid might work for you ok. In colder climates, Dexron III (GM adds some additives to their DexIII M/T fluid) is best choice, as it makes Tremec usable in the cold. I am a big fan of BMW MTL 4 - it works great in all climates. But not appropriate for a Tremec application.

 

[schernov]

Here is ATSV TSB which started the whole underfill thing. Prior to that GM did not care about underfilling the Dex3 filled Tremecs

 

[mfcentex]

Here is ATSV TSB which started the whole underfill thing. Prior to that GM did not care about underfilling the Dex3 filled Tremecs

It looks like the vent hole is/was working as intended.

 

[rubberduck]

It looks like the vent hole is/was working as intended.

I believe the main purpose to prevent a pressure buildup. On my Jeep I have vent hoses on my axles and yes they can eject gear oil, but only at first after a fluid change.