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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: ehjorten on September 26, 2016, 05:00:44 pm

Title: Late Model 4L80e Pan on Early Model?
Post by: ehjorten on September 26, 2016, 05:00:44 pm

Is there any technical reason why I could not fit the 1997-2000+ 4L80e Transmission pan on my 1991 4L80e?  The reason why I ask is it has a drain plug in it stock (GM 24204278), Filter (GM 89016656).  Also...while cast aluminum is nice, it isn't as forgiving at a steel pan!  You can bash a steel pan and be okay, but not an aluminum one.  I would also get the GM composite, reusable gasket (GM 8677743).

Title: Re: Late Model 4L80e Pan on Early Model?
Post by: LTZ C20 on September 26, 2016, 05:56:16 pm

Aluminum pans increase the structural rigidity of the case and with a quality gasket virtually eliminate leaks. Aluminum all day long.

Title: Re: Late Model 4L80e Pan on Early Model?
Post by: Irish_Alley on September 28, 2016, 04:26:58 pm

i dont know why but they require a different filter also. 91-96 is one while 97+ is another

Title: Re: Late Model 4L80e Pan on Early Model?
Post by: LTZ C20 on September 28, 2016, 04:49:33 pm

Quote from: Irish_Alley on September 28, 2016, 04:26:58 pm

i dont know why but they require a different filter also. 91-96 is one while 97+ is another

Some pans are deeper than others and the filter sits different against the bottom of the valve body, thus the different filters.

Title: Re: Late Model 4L80e Pan on Early Model?
Post by: Captkaos on December 06, 2016, 10:41:48 am

The 4L80E was redesigned the lubrication system 1997.   Everything  from the center support back has differences.

Chris Lucas
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