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Tranny pan: stock or chrome deep B&M?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by 90K5, Jan 10, 2001.

  1. 90K5

    90K5 1/2 ton status

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    I have a chrome B&M deep tranny pan that I got last year, before I knew that chrome rusts and holds in heat. I got it for the extra cooling, and drain plug. The problem with it is, you have to modify the filter a lot so it will fit and have the right length pick up, and the chrome is going to rust soon I think. If I put a drain plug in the stock pan, would it be better than the one on there now? Which one should I use?

    90K5

    See my truck at <A target="_blank" HREF=http://albums.photopoint.com/j/Albumindex?u=1329584&a=9886502>http://albums.photopoint.com/j/Albumindex?u=1329584&a=9886502</A>
     
  2. DMK

    DMK 1/2 ton status

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    Had a B&M deep pan on my 89 for 5 years it never rusted. Mine came with a filter extension. Since you already have it why not use it. To keep chrome from rusting wax it every few months.
     
  3. Boss

    Boss 1/2 ton status Author

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    I pondered this question awhile back myself. Yes, chrome does hold in heat, but remember, you're adding like 3 quarts of ATF, so that offsets it, and it does help keep the tranny a bit cooler. So, I went ahead and put mine in. I have a TH350, and no extension needed. The filter went to the usual spot. Not sure with your 700R4 though.
    Boss
    <A target="_blank" HREF=http://www.boss.coloradok5.com>http://www.boss.coloradok5.com</A>

    [​IMG]
     
  4. Blue85

    Blue85 Troll Premium Member

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    Why is a filter extension required? The filter slides into the hole in the oil pump and then clips up against the valve body. It doesn't sit on the bottom of the stock pan, so why would it have to be lowered with a deeper pan?

    <font color=blue>Powered by a Goodwrench 4-bolt longblock [​IMG]
    240hp...for now.</font color=blue>
     
  5. ftn96

    ftn96 1/2 ton status

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    Thats what I was thinking. I don't see why an extention would be needed. But I would go with the stock and drain plug and just change the fluid more often. Thats what I plan on doing. And changing it about every other oil change. I know this sounds a little excessive, but fresh fluid always makes you feel a little better. At least it does me anyway.

    Will work for parts, beer and sex.
    90 Jimi,350/700R4/241/10bolts/3.73's/33's/4"
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  6. HarryH3

    HarryH3 1 ton status Author

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    You want the pickup to be as close to the bottom of the pan as possible so that it has a better chance of having fluid available on steep hills or other low fluid situations. The stock pan on Turbo 400's in trucks is supposedly deeper than on the cars for this reason.

    Think of trying to drink a soda with a straw. If you only stick the straw a little ways into the cup, then you can't get at all the soda. Get the straw to the bottom of the cup and you get to drink the whole thing. [​IMG]

    <font color=black>HarryH3 - '75 K5</font color=black>
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  7. Executioner

    Executioner 1/2 ton status

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    Good post, now will they beleive you ?
    Boss please think about it.
     
  8. ken

    ken 1/2 ton status

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    Lose all the stock pans and B&M chrome crap and get a Derale pan with the cooling tubes thru it. Cost about $75 or so thru Jegs or Summit. Now THAT'S how to cool fluid with a pan!!

    ken
     
  9. Executioner

    Executioner 1/2 ton status

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    Ken please say it anit so !
    What happens when you plug up the air flow vanes with mud/water, or a peice of gravel ?
    Buy any chance do you have any test data/results of this wounderful pan ?
     
  10. 6.2Blazer

    6.2Blazer 1/2 ton status

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    I would think you would have problems on the Derale pans with the tubes clogging up with mud, but while it would lose some of it's cooling capacity I don't think it would be any worse than a stock pan. They also market the pan as allowing air to flow through these tubes, but how much air is flowing at 2 mph on the trail. After all is said, they should allow more cooling than a stock pan because of the increased surface area.
    For the chrome pans, yes the chrome will hold in some heat but the increased surface area and the added capacity will make up for it, at least partially.
     
  11. Scoobydoo

    Scoobydoo 1/2 ton status

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    The best pan is the B&M "ALUMINUM" pan holds more fluid 1 or 2 quarts depending on what tranny you have, And aluminum dissipates heat better than any other metal plus it has cooling Fins to give more surface to add in dissipating heat. (No tubes to get crushed or clogged)
    The only bad thing is they are a few more $$$, but still alot cheaper than an overheated tranny[​IMG]

    Scooby Dooby Doo !!!
     
  12. Executioner

    Executioner 1/2 ton status

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    I heard you 6.2B, but the Tanny shops say otherwise. Sure would be nice to see some testing done.
    Maybe I will have to do one, anyone care to have any tempture pionts taken.
     
  13. Boss

    Boss 1/2 ton status Author

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    Executioner,

    What's up bud, long time no hear.
    Anyways, I'm not so sure I understand what you're trying to say when you said: "Good post, now will they beleive you ?
    Boss please think about it."

    Anyways, my point was, since he already had the Chrome B&M, why not go for it. Its chrome and will hold some heat, but like I said, the extra capacity/fluid will more than make up for that. As for the extension, I didn't even know they made one. Got me thinkin now. (Damn, shouldn't have spent all that money on Mobil 1 ATF! [​IMG] )
    Anyways, I agree, the B&M aluminum is definately the way to go, but it's pricey, over twice the cost of the chrome. Plus, I got my chrome pan for about $30, so that's why I'm using it.
    Boss
    <A target="_blank" HREF=http://www.boss.coloradok5.com>http://www.boss.coloradok5.com</A>

    [​IMG]
     
  14. HarryH3

    HarryH3 1 ton status Author

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    I'm not sure the aluminum pan would hold up well in an argument with Mr. Boulder. [​IMG] Aluminum is much more likely to bust open and leave you stranded if it hits something. A steel pan will bend and is much easier to repair in the field. I'm just not a fan of cast aluminum parts being down in harms way.

    <font color=black>HarryH3 - '75 K5</font color=black>
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  15. Bigd

    Bigd 1/2 ton status

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    I like the steel just for the toughness.I'd say if you have the crome pan use it what the hell.If your worried about cooling thats what they sell coolers for right.just my $.2
     
  16. Executioner

    Executioner 1/2 ton status

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    Another good point, how do yo fell about those AL rear diff covers, with the fins on them, do ya think they are
    thick enough to handle some ROCKS ?
     
  17. HarryH3

    HarryH3 1 ton status Author

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    I think they're a solution to a problem that doesn't exist. [​IMG] Same as I feel about the aftermarket tranny pans. I've never had a problem with the stockers. If it ain't broke, why fix it? [​IMG]

    <font color=black>HarryH3 - '75 K5</font color=black>
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  18. ken

    ken 1/2 ton status

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    I hear ya on that one. THe only reason I got a Derale for the TH400 trans in my '88 crewcab dually is that it weighs 7200 lbs by itself (with 42" Swampers) and with the 3000 pound camper on it and towing an 8500 pound brage, I need all the cooling for the tranny that I can get!! I also have the largest in front of the radiator cooler that money can buy, as well as the stock internal radiator one intact. The Derale may only give me 10-20 degrees of cooling (my guess) but that may be the difference between a burnt tranny or not...so for $75 I figured what the heck!

    ken
     
  19. HarryH3

    HarryH3 1 ton status Author

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    Yeah Ken, when you're going that extreme, then every little bit helps. I just wonder how much cool air is really available down under the truck. There's lots of engine and road heat down there. The good news is, it probably can't hurt anything! [​IMG]

    <font color=black>HarryH3 - '75 K5</font color=black>
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  20. Executioner

    Executioner 1/2 ton status

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    Well that's exactly what I was getting at, the tranny shops say the deep pan with the cooling fins built in, will
    make the tranny run hotter than the stocker, so your last saying may be False.
     

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