Red Line MTL question

[badams1]

I have been told that the Red Line MTL is the silver bullet to help smooth out the notchy (hard shifting) NV5600 6 speed transmission's that we have after a HD CON OFE South Bend clutch has been installed. First of all let me say that it is not the install or the clutch at question here and that has already been thoroughly discussed in TDR. S/B mentioned the hint that this Red Line was a good fix. I have tried the Penzoil Syncromesh, Royal Purple Syncrmax, Amsoil 2000 5w-30w, and factory fill but this thang ain't no corvett yet. The Red Line is a heavier SAE 70w80 GL4 synthetic but it also claims to be equal to SAE 30w and is the best thing since sliced bread. Yes, I know this is a HD truck but you know what I mean about shifting a NV5600. "Red Line MTL", guys what is the truth? Should I throw another $60. at it? I am thinking about a BD shift kit too is that a good idea? HIT ME!



03 HO HD 2500 LWB quad cab all the gauges Banks Six gun sp loader and everything else in the with way too much money spent on this toy already catagory.

 

[Rob Thomas]

Like you, I tried a ton of different brands in my 6-speed, none were any better than the previous one, and some were worse. Then thanks to the guys on the TDR who tired the Redline with success, I gave it a shot. I honestly noticed an instant difference, smoother, quieter, and easier to shift. It's been in the truck for a year and a half or so, still nice and red (lexan cover on the Fast Cooler), no leaks, and still shifts smooth. BTW, I have a double disk clutch also. IMO, it's a winner.



Rob

 

[CLAYTON]

I noticed a difference in the way my auto shifts after using redline... I will definitly use it again.

 

[PKleine]

Redline MTL in NV5600

I use Redline MTL in my NV5600 and it shifts smoothly.

 

[pgleavitt]

Worked for me also. Smoothed right out.

 

[DLeno]

So with all the kudos given to the MTL, I gotta ask: is there documented tracability to the Chrysler spec? last knew only the Mopar or Penzoil fluids will guarentee in writing and provide official and supported tracabiilty to the Chrysler spec. I'm trying to be very precise here because every time I chase down a fluid that promises to meet the chrysler spec and makes all the right marketing claims, the trail gets cold as soon as I ask for official written conformance to the chrysler spec, not just "we will guarentee your transmission if you use our fluid".



BTW, guys that have used the MTL: any change in the gear lash noise?

 

[badams1]

Thanks guys I am going for the Red Line asap! I am my own warranty station a long time ago. Its great to be in TDR, thanks again.

 

[Rob Thomas]

So with all the kudos given to the MTL, I gotta ask: is there documented tracability to the Chrysler spec?



BTW, guys that have used the MTL: any change in the gear lash noise?

I am my own warranty station so that wasn't a factor for me however, I would guess that DC would void your warrenty, simply because they can/could.



Yes, gear noise was noticably quieter on mine.





Rob

 

[Slow Six]

I feel that the Redline helped shifting quite a bit in my 6 speed. I also think that these trannys take a long time to break in. I only have 76000 kms. on mine and it gets better shifting with more use. As mentioned above, they are a heavy transmission and they will never shift like a car.

 

[mbaston]

I lost my transmission at 100K (hard towing miles). At 60K, I put in Royal Purple as that is all I could get up here besides the factory/penzoil. I think after breaking the new transmission in with the factory oil, I am going to go to the Redline. Everybody just has so much positive to say about it. I need to try to get a few more miles out of a transmission.

 

[WNowlan]

FYI... ...



Gear Oils and Motor Oils Viscosities are measured on different scales. SAE (Society of Automotive Engineers) Has two scales, SAE Gear Oil and SAE Crankcase oil.



70W-80 would be equivalent to a 5W20 Motor Oil

75W-90 would be equivalent to a 5W30 Motor Oil

80W-90 would be equivalent to a 10W30 Motor Oil



ATF is about a eqivalent to a 10W Motor Oil





I hope this helps clear up some confusion for you guys.

 

[DLeno]

I guess whats troubling me is that there are a few after market oils out there that appear to exceed the performance requirements, actually cross to the NV5600 application in the mfgs catalog, enjoy reasonably widespread use, appear to present no reliabillity problems, have happy customers, yield at least some subjective benefit, but for some reason these lubes have not been officially tested against the Mopar spec, which means they can't publish that they meet the spec. why? why can't Redline, Amsoil, and Royal Purple show that they meet/exceed the spec? Has Mopar built in some obscure or un-important spec that these guys can't or choose not to meet?



something just doesn't feel right about this.

 

[Pmaloney]

So WNowlan, are you trying to tell me that 75-90 will pour the same as 5-30? That doesnt sound right to me.

 

[CSilkowski]

I am thinking about a BD shift kit too is that a good idea?



The BD short shift kit will make it even more notchy because it changes the leverage position in order to acheive the short throw.

 

[DLeno]

So WNowlan, are you trying to tell me that 75-90 will pour the same as 5-30? That doesnt sound right to me.

pretty close, yes. "SAE viscocity" is only a loose correlation to absolute liquid viscosity, and is a term that can only be meaningfully compared within oil classifications. for example, SAE 75W Gear Viscosity has an absolute viscosity of about 12 cSt. SAE 10 Crank Case viscosity is also about 12 cSt. So we could say that 75W gear oil pours about the same as 10W crankcase oil. it turns out that 10W and 5W crankcase oils are pretty close in absolute cSt viscosity.



so even though the chart I reviewed doesn't put 75W equal to 5W, It certainly is close.

 

[Pmaloney]

I am still not believing this, any gear oil I have used without a doubt does not pour the same as 5/10-30. With the exception of the Mobil synthetic we use at the shop it seems to flow better, I guess I will have to try a 1 qt "Pour off" and see which is faster. :-laf

 

[Glen Pratt]

I used in my old '91 Mustang 5. 0 LX in a T-5 5speed. Shift like night and day with the Redline MTL. Silky smooth.