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Nordic1
02-07-2005, 12:22 PM
Newb time... I'm going to be changing out the filter in my tranny and is it ok to fill up my tranny with ATF +4 (98 42re uses +3)? Are there any drawbacks to ATF +4? Thanks

Jim311
02-07-2005, 01:18 PM
ATF+4 is actually better than AFT+3 in pretty much all cases. Not only is it safe to run, it's probably better for the tranny. Albeit much more expensive...

OverkillZJ
02-07-2005, 01:58 PM
ATF+4 is actually better than AFT+3 in pretty much all cases. Not only is it safe to run, it's probably better for the tranny. Albeit much more expensive...

Agreed

ATL ZJ
02-07-2005, 02:22 PM
The following is from http://www.wjjeeps.com/tsb_list.htm#2100404. It's a TSB from Chrysler:

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2100404 - AUTOMATIC TRANSMISSION FLUID USAGE ATF+4®

Date: 03/16/04 (supersedes 2100601 dated 6/29/01)

Model year(s): 1999-2004

Description: Information pertaining to automatic transmission fluid usage ATF+4®.

Details:1999-2002 Grand Cherokee. A new transmission fluid (ATF+4® Type 9602) has been developed and is being used as factory fill for all vehicles with Chrysler automatic transmissions. Until now, vehicles originally filled with ATF+2 or ATF+3 were to be serviced with ATF+3. Effective immediately, it is recommended that all vehicles with Chrysler automatic transmissions (except for 1999 and earlier minivans) be serviced with ATF+4®.

NOTE: ATF+4® MUST always be used in vehicles that were originally filled with ATF+4®. ATF+4® is compatible with ATF+3 and can be used to top off vehicles that currently have ATF+2 or ATF+3. DO NOT use ATF+2 or ATF+3 to top off vehicles that have ATF+4® fluid.

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® is a World Class Fluid having exceptional durability. However, the red dye used in ATF+4® is not permanent; as the fluid ages it may become darker or appear brown in color. ATF+4® also has a unique odor that may change with age. With ATF+4® fluid, color and odor are no longer indicators of fluid condition and do not support a fluid change.

Cue-Ball
02-07-2005, 02:22 PM
AMSOIL baby ;)

ATL ZJ
02-07-2005, 02:25 PM
I do realize that TSB was titled specifically for WJs, but it just shows Jeep's reasoning for recommending ATF+4 as a replacement for ATF+3. I just use ATF+3 in mine. I don't really care, as long as it works. My 42re is a POS anyways... it'll die soon enough either way.