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AutoTrak transfer case

Every so often, I drive around in Auto4WD. From what I've been told, this gets everything turning, lubricating and building up heat which helps "boil-off" excess moisture in the various components. Every 50K miles, you should change the transfer case fluid, too. Basically, when you're going to be on the highway for a while, throw it either into 4HI or Auto4wd to help keep things lubricated. I use Auto4wd every time it rains because it's fun to see what it takes to get it to kick in.

NOTE: the AutoTrak transfer case uses SPECIAL BLUE FLUID. If you put regular automatic transmission fluid in it, it'll have problems which will surface as a driveline clunk that ALOT of people have problems with.

I had a clunk in my transfer case and found a few different remedies - only to read somewhere that SOME AutoTrak cases were accidentally filled with Automatic Tranny fluid. The fix was to replace the red tranny fluid with the blue stuff: drain red, add blue, drive around for 50 miles, drain, add more blue. My clunk went away - it was like magic, I tell you. Now, it's starting to feel like it's coming back, so it's time to change the fluid again.
 

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4l60e

It's not likely you have a 4L80E with a 305. More than likely it's a 4L60E. The 4L80E is a workhorse: high power or high abuse situations. They take up more power from the engine, but they take the abuse of tow / work vehicles that spend most of their time moving more than just themselves. Sticking a
4L80E behind a 305 (or even a 350) would be serious overkill and a MAJOR power loss. A 4L60E in standard configuration will handle about 450 horsepower in a heavy vehicle - up to 750hp if built well and in a light vehicle like a Camaro or Firebird.

I've got a 4L80E behind a 6.0L in my 2004 Sierra 2500HD ... but it's a 1-ton configuration and it's geared towards a tow/work vehicle - expected to have high abuse over it's life. Let me tell you, towing my trailor in the middle of summer, up hills and keeping 80mph on the flats ... tranny temperature gage never got above 200 degrees. These 4L80Es are incredible, let me tell you.

Back to the subject, though - REALLY not likely that you've got a 4L80E behind your 305. Sorry.
 
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