Red Line MTL 70W80 GL-4 Gear Oil (SAE 5W30/10W30 engine oil viscosity). is this the stuff everyone is saying to use?

 

Dont know about the Red Line stuff you posted but I sure dont like the Royal Purple Syncromax stuff I just wasted $75 on! Now with the cold weather this thing is a bear to shift! Will have to find something better.

 

It must meet manual transmission requirements due to the soft metals in the tranny. I do not know the Red Line stuff but I seem to recall somewhere it said MTL, verify before putting it in.

I have been running Royal Purple for about 65,000 miles and have no complaints. I can't say it improved the shifting but I can say it did not hurt meaning I don't know if it made any difference.

 

Same here except i'm using Amsoil! It is a pain to shift and ends up grinding a bit when cold But before when there was stuff from the dealer, it shifted about the same. So i'm not to sure if there is any better stuff out there.

 

I use GM Syncromesh which is same as OEM Mopar but costs less



It was recommended and required by my transmission remanufacturer. I have no problem at all shifting at -18F

You can buy it at http://www.gmpartsdirect.com, overfill by 2 quarts.

 

I know when i had my 01 i used Amsoil and it seemed to help but not much. With these big trannys we really cant expect to much of a soft shift can we? Its just the nature of the beast.

 

Since I am the second owner I dont know what was in there but it shifted way better with what was in there than it does now with the RP. The stuff I drained out i would guess to be the original as the truck only has 40k on it and it was pretty dirty? Need to find something better.

 

How cold was it when you experienced your shifting problems?

 

Its been sub zero now for about 10 days (us westcoasters cant handle this cold) coldest has been around -16 at night. I noticed it was tougher to shift the day I changed it out so the oil used is definitely a factor.

 

That's odd, I run the RPS right now in my truck and I've been in New Brunswick which is probably comparable to those temps these days (normal for NB, not for BC- I grew up in the Lower Mainland), and I haven't noticed the RPS to be an issue...
It's pretty thin stuff, almost like ATF. It is actually recommended for manual gearboxes that use atf...

 

I've run Redline MTL in my NV5600 for over 4 years.

I don't overfill it. It shifts just fine.. It is a little stiff when cold but that's normal.

..Joe

 

NV5600 don't use ATF oil and don't even think about it. Overfilling will help lack of lubrication issues especially on top gears of transmission and the cooling of, it will add longevity to the unit.

 

I use Pennzoil syncro mesh., mine shifts fantastic, but it's never below 35degrees here. Learn to double clutch your transmission, that way you won't grind your syncos , and when it warms up go back to shifting normal. In case your not familiar with double clutching, you just wind out the gear your in, and then shift to neutral,let the clutch back out,then push back in and shift to the next gear. Just pretend neutral is a gear, , what it does is, when you let your clutch out in neutral, it makes your clutch disk get equal to the engine rpm, normally the cone part of the syncros try to slow it down before the gears slide in to each other, but when the lube is cold and thick, the syncos can't quite get the
rpms of the shaft&disk slow enough fast enough, and you'll get a grind. Shift like this for a week , and you can drive a semi no problem.

 

I do this shifting between 2nd and 3rd going up and down when the tranny is cold.

MikeyB