ATF+4 is a synthetic, I run Amsoil universal AFT in my AW4/Np231 with no issues. Those who have had "problems" with ATF+4/any other synthetic fluid in their AW4 apparently had bigger issues beforehand. It just like saying you should NEVER change your trans. fluid.
The W (winter weight) you run is really up to you/where you live. IF you live in a place that is warm enough you could run straight 30 or 40 if you wanted.
IF you have LSD, then run at least 75w-110, if not 75w-140 +fricition modifier. I run 75w-110 Amsoil SevereGear front and rear, no issues.

 

wrong atf +4 aw4 is fine.. look at the tsb released in 2006

ATF+4 can handle more heat than Dextron. Its been proven... I have used it in my own aw4 for a long while now...
here is the TSB


Quote:
Originally Posted by Chrysler, LLC
NUMBER: 21-014-07
GROUP: Transmission
DATE: October 16, 2007
THIS BULLETIN SUPERSEDES TECHNICAL SERVICE BULLETIN 21-010-06, DATED APRIL 14, 2006, WHICH SHOULD BE REMOVED FROM YOUR FILES. ALL REVISIONS ARE HIGHLIGHTED WITH **ASTERISKS** AND INCLUDES THE ADDITION OF THE ASIAN WARNER (AW4) TRANSMISSION AND ADDITIONAL MODELS AND YEARS.
SUBJECT:
Automatic Transmission Fluid Usage ATF+4 (Type M59602) MODELS:
1989 - 1995 (AA) Spirit/Acclaim/Lebaron Sedan

1989 - 2003 (AB) Ram Van/Wagon

1989 - 1993 (AC) Dynasty/New Yorker/New Yorker Salon

1989 - 1993 (AD) Ram Truck

1989 - 1994 (AG) Daytona

1989 (AH) Lancer/Lebaron GTS

1989 - 1995 (AJ) Lebaron Coupe/Lebaron Convertible

1989 - 1990 (AK) Aries/Reliant

1989 - 1990 (AL) Horizon/Omni

1989 (AM) Diplomat/Gran Fury/New Yorker fifth Avenue

1989 - 2004 (AN) Dakota

1989 - 1994 (AP) Shadow/Sundance

1990 - 1991 (AQ) Maserati

1990 - 1993 (AY) Imperial/New Yorker Fifth Avenue

1994 - 2003 (BR/BE) Ram Truck

2004 - **2008** (CS) Pacifica

1998-2003 (DN) Durango

2002 - **2008** (DR/DH/D1) Ram Truck

2007 - **2008** (DC) Ram 3500 Cab Chassis

1995 - 2000 (FJ) Sebring/Avenger/Talon

1996 - 2000 (GS) Chrysler Voyager (International Market)

2004 - **2008** (HB) Durango

**2008 (HG) Aspen**

1995 - 2000 (JA) Cirrus/Stratus/Breeze

2007 - **2008** (JK) Wrangler

2001 - 2006 (JR) Sebring Sedan & Convertible/Stratus Sedan

2007 - **2008** (JS) Avenger/Sebring/Sebring Convertible

1996 - 2000 (JX) Sebring Convertible

**2007 - 2008 (KA) Nitro**

2002 - 2007 (KJ) Liberty

**2008 (KK) Liberty**

**2008 (L2) 300C (China)**

1993 - 2004 (LH) Concorde/Intrepid/Vision/LHS/New Yorker
/300M

2005 - **2008** (LX/LE) 300/Magnum/Charger

1996 - 2000 (NS) Town & Country/Caravan/Voyager

1995 - 2005 (PL) Neon

2002 - 2003 (PG) PT Cruiser (International Markets)

2001 - **2008** (PT) PT Cruiser

1997 - 2002 (PR) Prowler

2001 - 2007 (RG) Chrysler Voyager (International Markets)

2001 - 2007 (RS) Town & Country/Caravan/Voyager

**2008 (RT) Town & Country/Grand Caravan/Grand Voyager
(U.S. & International Markets)**

1997-2006 (TJ) Wrangler

2001 - 2004 (WG) Grand Cherokee (International Markets)
Vehicles equipped with Gas engines

1999 - 2004 (WJ) Grand Cherokee

2005 - **2008** (WK/WH) Grand Cherokee

2006 - **2008** (XK/XH) Commander

1989 - 1995 (YJ) Wrangler

**1989 - 2001 (XJ) Cherokee**

**1989 - 1993 (MJ) Comanche**

1996 - 1998 (ZG) Grand Cherokee (International Markets)

1994 - 1998 (ZJ) Grand Cherokee/Grand Wagoneer

NOTE :**AWA (Asian Warner) transmission are now included in this Service Bulletin. ATF+4(R) is recommended for AW-4 (Asian Warner) transmissions** NOTE :This Service Bulletin DOES NOT apply to Sprinter transmissions, Crossfire transmissions, MK/PM vehicles equipped with Continuously Variable Transmission (CVT) and WG vehicles equipped with a diesel engine (sales code ENF) and a W5J400 or NAG1 transmission (sales code DGJ). DISCUSSION:
ATF+4(R) - (Type 9602) is being used as factory fill for Chrysler Group automatic transmissions. ATF+4(R) is recommended for all vehicles equipped with Chrysler Group automatic transmissions EXCEPT FOR THOSE LISTED IN THE NOTE ABOVE.
NOTE :ATF+4(R) must always be used in vehicles that were originally filled with ATF+4(R). DO NOT USE ANY OTHER FLUID. NOTE :ATF+4(R) is backward compatible with ATF+3, ATF+2, and ATF+. Additionally, ATF+4(R) can be used to top off vehicles that used ATF+3, ATF+2, or ATF+. NOTE :If ATF+4® is used to service models originally filled with ATF+3, ATF+2, and ATF+ the fluid maintenance schedules listed for that model does not change. The service interval currently in effect for a given model should continue to be followed. Refer to the Service or Owners manual for maintenance schedule directions. In general terms, If ATF+, ATF+2 or ATF+3 was the recommended fluid, it is now recommended to use ATF+4®
BENEFITS
^ Better anti-wear properties ^ Improved rust/corrosion prevention ^ Controls oxidation ^ Eliminates deposits ^ Controls friction ^ Retains anti-foaming properties ^ Superior properties for low temperature operation FLUID COLOR
Mopar ATF+4(R) has exceptional durability. However, the red dye used in ATF+4(R) is not permanent; as the fluid ages it may become darker or appear brown in color. ATF+4(R) also has a unique odor that may change with age. With ATF+4(R) fluid, color and odor are no longer indicators of fluid condition and do not necessarily support a fluid change.

PARTS REQUIRED:
POLICY:
Information Only Disclaimer :This bulletin is supplied as technical information only and is not an authorization for repair.

 

The problem lies in kinematic viscosity. The hypoid gears are designed to work with a specific tolerance at operative temperatures. This tolerance is given by the ability of the lubricant to create a film thick enough for the drive gear involute curve to roll over the driven gear tooth and reduce friction. At 100 °c a 75w 90 oil has a kinematic viscosity of 17 centistokes while a 10w40 drops down to 4-5 centistokes. At that viscosity a hypoid gear is working too near to the other gear and the projectual tolerance is not respected anymore. The result of this friction is a further heat increase that takes the oil near to it's flash point temperature where the synchromesh wear out fast.
A SAE 75W 90 gear oil is usually a totally sinthetic fluid that does not contain sulfur additives.
You have spoken to a mechanical engineer here that designs engines, transmissions and drive trains for a well known car builder brand.

 

Mine was shifting like crap, I flushed out my AW4 with ATF+4 about 2 years/25k ago and It shifts great!

 

The Rooster, we already said Dexron II (not dextron) or better.
AW4, the AW stands for Aisin Warner ( no such asian warner lol), the company is a Japanese subsidiary of Borg Warner.

 

Royal Purple does not recommend Synchromax in the AX-15. They do recommend 10W40 for no problems, 10W30 if your tranny is a bit worn and 5W30 if it shifts really ****ty.

 

i copied that from a chrysler TSB website lol they can't spell haha i guess i should spell check it next time..

 

Royal Purple would recommend to **** in the tranny if they were selling funnels.

 

You have spoken to a mechanical engineer here that designs engines, transmissions and drive trains for a well known car builder brand.[/QUOTE]

I am aware of your training and ability's based on your posts, not trying to force my findings on anybody, just sharing my findings!

 

A quart of synchromax costs about 15 bucks. A quart of 10W30 costs about 7.

Pretty much blows your theory that they are only interested in money.

 

Where the hell are you buying 7$ oil?

 

http://cgi.ebay.com/ebaymotors/Royal...Q5fAccessories

That's $7.41 a quart. I can get it at National Speed for about the same.

 

this is wat i did
royal purple 75W-90 3.5 quarts for the tranny
royal purple atf for dexron mercon lll in the t case
and 75 -90 in the diffs

 

A quart of fully synthetic 75w 90 oil on e-bay: $6.99, made in USA.
http://cgi.ebay.com/ebaymotors/Super...ltDomainQ5f100

 

i honestly could care less of the price that stuff looks about as good as a gas station brand oil