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  1. #1

    Question Transmission questions

    So I have a '99 K3500 cc/lb w/ a 454/4L80e w/ 211K original miles. Second gear finally gave up in my trans after more than a year of holding together after messing up & then working again after a fluid & filter change. It's now so dead that it acts like a Powerglide w/ overdrive. It revs to 2700 in first gear, then skips to to third gear @ 1000. Thats after another fluid & filter change to try and save it once more. So it's done for. I'm having it rebuilt by a local trans shop that's giving me a 36/36000 warranty for $2500.

    My questions are:

    A) Does anyone have any experience w/ the Derale 4L80E trans pan? If so, positives/negatives?

    B) Does anyone have any experience w/ Royal Purple Max ATF in a 4L80E? Does it work well and is it worth it?

    C) Any other recommendations for having my trans rebuilt to last for many more years and another 200K miles?
    1999 Chevy K3500 CC LWB
    Vortec 454, 4L80E, 4x4 - Like a Rock!!

    1987 GMC R1500 Sierra Classic
    350 TBI, 700R4, 2WD - my project

  2. #2


    A)Not for sure on the trans pan question, Im sure someone else will field it though...

    B)So far my experience with RP ATF has been good. We've put it in a couple of transmissions for customers that wanted it and they've had zero complaints.

    Also, I just started using B&M TrickShift ATF in my 4l60 and everything seems to be going well. There is very minimal noise from the tranny (compared to the first 100k miles with regular ATF), the shifts are more smooth than before. I like it.

    C) Are you having it built just to factory spec? Upgrading it always helps with the life of transmissions vs going back to stock.

    "If you're not living life on the edge, You're taking up too much space"

    "Truck Norris"
    - 2008 TX Edition Silverado
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    "Kristine" - 1991 Nissan 240sx
    - Cut to pieces, LS build pending

  3. #3


    The guy says that he's going to install a heavy duty torque converter and use improved over factory components. I've managed to learn a lot about most every component of my truck, but transmissions are still Greek to me.

  4. #4


    A great way to make a tranny last is to keep its temperatures down. Do you have a factory tranny cooler? How much and often do you tow? And has the fluid ever smelled or looked burnt.

    1996 Chevy Tahoe LT 5.7L V8 4X4 205,000+ miles. Built proudly at Janesville Assembly in Janesville, Wisconsin
    Basic mods: Lights all over, bunch of electrical work, and a couple cooling mods.

    Check out my other mods in My Garage:

  5. #5


    Yeah, she's got the factory cooler in the radiator.

    As far as towing, the most I've ever pulled w/ her is 9500, give or take a bit. I've only done that once. Normally I only tow about 6-7000 max behind her, Usually an old car or truck on a '70's vintage tandem axle 16' trailer. And then that's only a half dozen times a year at most. Her usual load is a load of 3-4 round bales or 75-100 square bales about 3 days a year.

    The fluid was still red and smelled fine @ 200K miles when I changed it the first time. And I'm pretty certain that the previous owner never changed it, as it still had original plugs and wires when I got her @ 131K

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