Ironfireman
Newbie
I have a 241C transfer case and I'm wanting to change the fluid in it. Anybody know the AC Delco fluid number I should use? Wanting to double check before ordering fluid. Thanks!
241C Fluid Recommendation
- Thread starter Ironfireman
- Start date
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Justin S
Truck Hoarder
Use regular ATF
Kirth Gersen
Newbie
From GM TSBs I've seen posted, the fluid should only be Dexron-3, NOT newer Dexron fluids. Dexron-6 is backward compatible to Dex-3 for use in 4L60 transmissions, but not in the transfer case.
GM stopped official licensing of the Dexron-3 spec in about 2006. Many Dexron-3 "equivalents" are on the market from reputable producers, but they're not guaranteed to the original GM spec.
If you want to be conservative, GM superceded Dexron-3 with "Manual Transmission Fluid # 88861800". But it's identical to the original Dexron-3.
Having said all that, you're probably fine with a reputable Dexron-3 fluid ;-)
Kirth Gersen
Newbie
below is the re-posting of the GM bulletin I referred to:
The following article is from TECH Link dated May 2007. TECH Link is sent to all GM Dealers every month.
In early 2005, General Motors released a newly developed automatic transmission fluid (ATF) for the factory fill of all GM Powertrain stepped-gear automatic transmissions. The new fluid provides significantly improved performance in terms of friction durability, viscosity stability, aeration and foam control and oxidation resistance. In addition, the fluid has the potential to enable improved fuel economy and extended drain intervals. Because the performance of the new fluid far exceeded that of the DEXRON-III service-fill fluids available at the time, it became necessary to upgrade the DEXRON service-fill specification in order to ensure that similar fluids were available in the market for service situations. This latest upgrade to the service- fill specification is designated DEXRON-VI.
Since General Motors introduced the first ATF service-fill specification in 1949, it has been necessary to upgrade the specification periodically.
The upgrading process ensures that available service-fill fluids are of an appropriate quality for use in transmissions that have been designed around the factory-fill fluid performance.
TIP: As with previous upgrades, DEXRON-VI fluids are designed to be backward compatible with earlier transmission hardware. More importantly, earlier type fluids are not forward compatible with transmission hardware that was designed to use DEXRON-VI fluid.
DEXRON-III is not compatible with the most recently designed transmissions, and the use of these earlier type fluids could result in transmission damage. All current calibrations and certification tests are now conducted with DEXRON-VI ATF. DEXRON-III fluids should not be used for those applications where the owner manual recommends the use of DEXRON-VI.
TIP: GM does not license or support obsolete ATF specifications or the use of fluids that are being marketed against cancelled specifications.
All DEXRON-III licenses expired at the end of 2006 and will not be renewed. Beyond that date, GM will support only DEXRON-VI fluids for use in Hydra-Matic transmissions. Avoid fluids sold in the market after that date bearing claims such as “suitable for use in
DEXRON-III applications” or similar wording. 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.
- Thanks to Angela Willis
Precaution: DEXRON-VI in Manual Transmissions
When DEXRON-III is indicated as the fluid fill for manual transmissions and transfer cases, DO NOT use DEXRON-VI. Instead, use GM Manual Transmission Fluid p/n 88861800 in these components.
TIP: Refer to PIP3836B (Feb. 2007).
If the manual transmission or transfer case indicates use of DEXRON-VI, then, of course, it should be used.
Purging Equipment
Before filling your bulk fluid equipment with DEXRON-VI, be sure to purge the old oil from it.
Also, be sure to purge your J-45096 Transflow machine before using it with DEXRON-VI.
source: bobistheoilguy.com/forums/ubbthreads.php?ubb=showflat&Number=1275871#Post1275871
The following article is from TECH Link dated May 2007. TECH Link is sent to all GM Dealers every month.
In early 2005, General Motors released a newly developed automatic transmission fluid (ATF) for the factory fill of all GM Powertrain stepped-gear automatic transmissions. The new fluid provides significantly improved performance in terms of friction durability, viscosity stability, aeration and foam control and oxidation resistance. In addition, the fluid has the potential to enable improved fuel economy and extended drain intervals. Because the performance of the new fluid far exceeded that of the DEXRON-III service-fill fluids available at the time, it became necessary to upgrade the DEXRON service-fill specification in order to ensure that similar fluids were available in the market for service situations. This latest upgrade to the service- fill specification is designated DEXRON-VI.
Since General Motors introduced the first ATF service-fill specification in 1949, it has been necessary to upgrade the specification periodically.
The upgrading process ensures that available service-fill fluids are of an appropriate quality for use in transmissions that have been designed around the factory-fill fluid performance.
TIP: As with previous upgrades, DEXRON-VI fluids are designed to be backward compatible with earlier transmission hardware. More importantly, earlier type fluids are not forward compatible with transmission hardware that was designed to use DEXRON-VI fluid.
DEXRON-III is not compatible with the most recently designed transmissions, and the use of these earlier type fluids could result in transmission damage. All current calibrations and certification tests are now conducted with DEXRON-VI ATF. DEXRON-III fluids should not be used for those applications where the owner manual recommends the use of DEXRON-VI.
TIP: GM does not license or support obsolete ATF specifications or the use of fluids that are being marketed against cancelled specifications.
All DEXRON-III licenses expired at the end of 2006 and will not be renewed. Beyond that date, GM will support only DEXRON-VI fluids for use in Hydra-Matic transmissions. Avoid fluids sold in the market after that date bearing claims such as “suitable for use in
DEXRON-III applications” or similar wording. 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.
- Thanks to Angela Willis
Precaution: DEXRON-VI in Manual Transmissions
When DEXRON-III is indicated as the fluid fill for manual transmissions and transfer cases, DO NOT use DEXRON-VI. Instead, use GM Manual Transmission Fluid p/n 88861800 in these components.
TIP: Refer to PIP3836B (Feb. 2007).
If the manual transmission or transfer case indicates use of DEXRON-VI, then, of course, it should be used.
Purging Equipment
Before filling your bulk fluid equipment with DEXRON-VI, be sure to purge the old oil from it.
Also, be sure to purge your J-45096 Transflow machine before using it with DEXRON-VI.
source: bobistheoilguy.com/forums/ubbthreads.php?ubb=showflat&Number=1275871#Post1275871
