I'd use nothing but Redline MTL in the NV3550 and NSG370 transmissions. This stuff...

https://www.amazon.com/Red-Line-Tra...ant/dp/B000CPCBEG/ref=sr_1_1?ie=UTF8&qid=1542072557&sr=8-1&keywords=redline+mtl

Most agree it's not surpassed by any other transmission lube but it's not a miracle worker if there's a mechanical issue inside the transmission.

 

Ya ya .. I try the redline mtl !! Syncromax is ok to run ?

 

I also found RP Syncomax to be notchy when I tried it in my '00 TJ (NV3550) several years ago.

Switched to Amsoil Synchomesh and never looked back

https://www.amsoil.com/shop/by-prod...-product/transmission-fluid/manual/manual-synchromesh-transmission-fluid-5w-30/

 

Cmon Jerry....Redline over OEM (Mopar) fluid for the NV3550?

 

Redline is hands down better than the Mopar fluid. In cold weather, MTL has made my 1-2 shift 90% better.

 

Howdy Bromel. I do believe it's individual experiences as opposed to a broad claim. I tried four different fluids and in my specific Jeep, Mopar made the most drastic difference, especially from the 1 - 2 shift. Regardless, whatever works best in each Wrangler is what I recommend!

 

Fair, fair, can't argue that. I'd still say that Redline is best because it's fully synthetic, which makes it flow better at cold temps. But if a different gear oil works best, why not? I've also heard good things about RP.

 

im goin with the redline,,, im way ,way up canada border north washington.. 19 deg. now..

 

thanks soooo much !!

 

im goin with the redline,,, im way ,way up canada border north washington.. 19 deg. now..

 

let me know if it works for you.....i too have notchy shifts from 1-->2, but have been told by countless people that its normal.....meanwhile im thinking even Jeep / Chrysler wouldnt allow that to come off an assembly line like that

 

:welcome: to the Forum..:wavey:

 

Maybe it's because in Central SC, "really cold mornings" are infrequent, so my experiences are different. But dang, y'all have me wanting to try Redline now, just to see if it's better in my NV3550.

 

Ya i think royal purple i full synth. But i let ya know as soon as i get it in ......the redline will be the one !!!!!

 

I agree, I have heard only great results from those using Red line.
I used the Pennzoil in my 2000 with no issues whatsoever, but I can say that is not the norm across the board.
I can also say the Royal Purple was garbage. Little better than grape flavoraide with similar results.

Sent from my SM-T380 using Tapatalk

 

I also experienced improved shifting using the Amsoil fluid, especially in colder temps.

 

Redline mtl. Works great ! Burr cold... Way better than royal purple... Thanks again..