Best ATF for NP231?

M

montanaman

NAXJA Forum User

Location

Western Montana

• Apr 29, 2017

• #1

'91 xj with NP231.

What's a high-quality ATF fluid for this? The '91 FSM says Dexron II or Mercon ATF, but that's obviously dated.

I run Mobile 1 Extended Performance synthetic oil in the motor ... is there a similar-quality fluid for the TC? I'm rebuilding mine, and would like to run some good stuff in there to keep it in good shape. Something commonly found in a store would be helpful, but I can order online if necessary.

Thanks.

 

Last edited: Apr 29, 2017

N

N8N_99xj

NAXJA Forum User

Location

Berwyn Heights, MD

• Apr 29, 2017

• #2

I've used Redline D4 in my '99 but that may be overkill. Same in the transmission.

 

M

montanaman

NAXJA Forum User

Location

Western Montana

• Apr 30, 2017

• #3

Thanks.

I was thinking of running Castrol Dex-III for a few hundred miles of break-in, then switching to the better stuff. The Redline D4 looks really good. I run their MT-90 in my AX15.

Any other ideas?

 

Last edited: Apr 30, 2017

T

trippled

NAXJA Forum User

Location

colorado springs, co

• Apr 30, 2017

• #4

I'd run a synthetic atf. I put amsoil in mine last, but only because we carry it at work. T case fluid has a hard life, and buying a good fluid helps make it last.

 

M

md21722

NAXJA Forum User

Location

TN

• Apr 30, 2017

• #5

I run MAG1 from the farm & ranch store, Valvoline, or Castrol conventional and change it every 20,000 miles, same as the the transmission. Been doing it this way for the better part of 300,000 miles...

 

Tim_MN

Freakish Hand Strength

NAXJA Member

Location

Minneapolis, MN

• Apr 30, 2017

• #6

Any brand or type of ATF is fine. Don't overthink it, the 231 and 242 are just chain driven transfer cases. Since the AW-4 transmission uses Dexron/Mercon that is what I put in my 231 and 242 transfer cases. Dex/Merc is also specified in the Jeep Service Manual.

 

J

jeep ride

NAXJA Forum User

Location

West Virginia 25064

• Apr 30, 2017

• #7

I use napa brand dexron III in my 98 xj

 

S

sinat01

NAXJA Forum User

Location

Preston county, WV

• Apr 30, 2017

• #8

I run Mobil one ATF in mine and Redline MTL in my trans

 

CharlesS

NAXJA Forum User

Location

Quezon Province, Philippines

• Apr 30, 2017

• #9

montanaman said:

Thanks.

I was thinking of running Castrol Dex-III for a few hundred miles of break-in, then switching to the better stuff. The Redline D4 looks really good. I run their MT-90 in my AX15.

Any other ideas?

Click to expand...

I use Synchromesh in the the AX15 and D4 ATF Redline in the NP231. The synchromesh provides for smoother shifting.