Fluid check

[93gmcjimmy]

Ok I am fairly new to 4X4's. I have a 93 GMC Jimmy 4.3l V6. When and how how often should I change the front and rear diff and transfer case fluid. Should I spend the extra and use synthetic? This veh does not see much off road use and is fairly stock. It's mainly a daily driver. I'm taking the truck in to have the tranny flushed anyway is it worth the extra $$$ to just have them do all the fluids at once or can I change the diffs and transfer oil myself fairly easily?

[old_master]

DO NOT get the transmission flushed. Change the fluid, filter, and gasket only. Transmission, differential and transfer case fluids, (under normal operating conditions), should be changed approximately every 36,000 miles. Synthetic fluids are not necessary. Front differential and transfer case have drain plugs. The cover on the rear differential must be removed to drain the fluid, and a new gasket is necessary.

[MT-2500]

As Old Master says no transmission flushing.
But on rear ends if you go synthetic greese they should be flushed if changing over.

Another note on transmission fluid Dexron 111 is no longer being made.
Dexron 6 is the replacement fluid now.
Beware of multi purpose or fit all fluids.
Ford Mercon and Dexron 3 is now Dexron 6

A lot of parts places and even some so called Ford techs/dealers.
Are saying to use Multi purpose or Mercon V or other stuff..
Doing so may mess up you transmission.

Ford Mercon was fazed out to Mercon/Dexron 3 several years ago.
Now Dexron 3 has been fazed out.

The only approved replacement for Mercon or Dexron 3 is Mercon 6.




All DEXRON®-III licenses expired at the end of 2006 and will not be renewed. That's why you're seeing multi-use fluid.
Beyond that date GM will only support the use of DEXRON®-VI fluids for use in Hydra-Matic transmissions. Fluids sold in the market after that date bearing claims such as “suitable for use in DEXRON®-III applications” or similar wording should be avoided. DEXRON®-VI licensed fluids are fully backward compatible and can be used in all applications covered by earlier GM ATF specifications. The use of unlicensed fluids and/or non GM approved aftermarket additives may prove detrimental to transmission performance and void warranty coverage.
GM-approved brands of DEXRON®-VI This list represents the companies who have conducted the appropriate testing and received GM approval. Company name, license number, and brand name are shown.
DEXRON®-VI Service Fill Approved Fluids
Company License Number Trade Name
Advanced Lubrication Specialties
Allegheny Petroleum J-60152 Altra DEXRON®-VI Transmission Fluid
American Agip Co. Inc. J-60306 Agip DEXRON®-VI ATF
BP Lubricants USA, Inc. J-60309 Castrol DEXRON®-VI ATF
Chevron Corporation J-60005 Chevron ATF DEXRON®-VI
Chevron Corporation J-60005 Havoline ATF DEXRON®-VI
Chevron Products Company J-60308 Chevron ATF DEXRON®-VI
Chevron Products Company J-60308 Havoline ATF DEXRON®-VI
Citgo Petroleum Corporation J-60317 CITGO TRANSGARD DEXRON®-VI
ConocoPhillips J-60004 ConocoPhillips Company DEXRON®-VI ATF
ConocoPhilips J-60004 Kendall Motor Oil Company DEXRON®-VI ATF
ExxonMobil Corporation J-60002 ExxonMobil IMP 6544
Fuchs Petrolub AG J-60310 TITAN ATF 6000 SL
GMSPO J-60301 GM Vehicle Care DEXRON®-VI ATF
GMSPO J-60301 AC/Delco DEXRON®-VI ATF
Gulf Oil International J-60304 Gulf DEXRON®-VI ATF
Gulf Oil International J-60311 Gulf DEXRON®-VI ATF
Kuwait Petroleum J-60314 Q8 Auto D VI
Lubricating Specialties Company J-60322 Unitran DEXRON®-VI
Northland Products J-60316 Northland DEXRON®-VI ATF
PDVSA Deltaven S.A. J-60315 TRANSFLUIDO SINTEICO DVI
Penrite Oil Company Pty Limited J-60302 Penrite ATF DX-VI
Penrite Oil Company Pty Limited J-60312 Penrite ATF DX-VI
Petro-Canada Lubricants J-60001 Petro-Canada DEXRON®-VI ATF
Pinnacle Oil, Inc. J-60321
Pinnacle Resources, Inc. J-60320
SK Corporation J-60003 ZIC DEXRON®-VI
SOPUS Products J-60307
Valvoline J-60151 Valvoline ATF DEXRON®-VI
Valvoline J-60319 Valvoline ATF DEXRON®-VI
Valvoline (Australia) Pty Limited J-60313 Valvoline ATF DEXRON®-VI
Warren Oil Company J-60318 COASTAL DEXRON®-VI
Warren Oil Company J-60318 WARREN DEXRON®-VI
Warren Oil Company J-60318 LUBRIGUARD DEXRON®-VI
Warren Oil Company J-60318 SERVICE PRO DEXRON®-VI