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Thread: 4L80 machined oil pan recommendations.

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    2 Star General hummer4x4guy's Avatar
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    Default 4L80 machined oil pan recommendations.

    This past weekend I did my 3rd attempt to get my transmission pan leak fixed. It didnít happen. So I want to go with a machined pan and I am looking for suggestions on a pan that is good to go with. One with a drain. One that will clear the cross member of which mine has about 3/8 of extra space to work with.
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    Joel
    1987 M998 ...New frame, engine, upgraded tcase, DWF kit, upgraded LED headlights with stone guards, upgraded brushguard, upgraded seats, upgraded tires and rims, pushbutton light switch, troop seats, spare tire carrier, HD rear bumper, mud flaps, under carriage protection, camo netting rack, bullet resistant windshield, A2 steering wheel, new hood.
    2001 M1102

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    4 Star General Retiredwarhorses's Avatar
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    I have 8 4L80 trucks....none of them leak from the pan. For some odd reason, even the new trucks donít have a drain
    plug on the pans, I put them on all my trucks while doing the first trans filter.
    stock pan and stock reusable OEM gasket is what I use.
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    2 Star General hummer4x4guy's Avatar
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    If the pan lip has an issue itís always going to leak. It was a brand new pan that was installed. 3 attempts and still leaks enough to cause an issue. I wish the OEM pan and seals would of done the trick as I donít want to put out the cash for a machined pan but itís that or one day run too low on fluid and destroy a good transmission.
    Joel
    1987 M998 ...New frame, engine, upgraded tcase, DWF kit, upgraded LED headlights with stone guards, upgraded brushguard, upgraded seats, upgraded tires and rims, pushbutton light switch, troop seats, spare tire carrier, HD rear bumper, mud flaps, under carriage protection, camo netting rack, bullet resistant windshield, A2 steering wheel, new hood.
    2001 M1102

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    4 Star General Retiredwarhorses's Avatar
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    Quote Originally Posted by hummer4x4guy View Post
    If the pan lip has an issue it’s always going to leak. It was a brand new pan that was installed. 3 attempts and still leaks enough to cause an issue. I wish the OEM pan and seals would of done the trick as I don’t want to put out the cash for a machined pan but it’s that or one day run too low on fluid and destroy a good transmission.

    I’ve installed so many of these pans I’ve lost count, none leak..never even had one leak.
    are you using OEM pan and gasket? You should NOT be using any RTV.
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    4 Star General Retiredwarhorses's Avatar
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    Are you sure it’s the pan and not a pump seal?
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    Private REF's Avatar
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    I went with this pan, cast aluminum deep sump with drain plug, fit great - slight mod to linkage on left side to accommodate the thicker flange on the cast pan. CT powertrain Products
    34-4L8-840A-Deep cost was $250.00 ctpowertrain.com 1-888-828-7697 I ordered mine on-line but it shows currently out of stock. I didn't have a leak just serviced the trans and wanted a drain plug for next time and 3.25 qts extra oil in the pan can't hurt.
    Hope it helps

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    4 Star General Retiredwarhorses's Avatar
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    Quote Originally Posted by hummer4x4guy View Post
    If the pan lip has an issue it’s always going to leak. It was a brand new pan that was installed. 3 attempts and still leaks enough to cause an issue. I wish the OEM pan and seals would of done the trick as I don’t want to put out the cash for a machined pan but it’s that or one day run too low on fluid and destroy a good transmission.
    The pan would have to be quite distorted, there are a lot of bolts,quite close together to make any distortion disappear once torqued. I use a lot of used pans that when they arrive, are distorted and a little hammering gets them looking ok...once torqued, no issues.
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    Private REF's Avatar
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    OK found the cast pan in stock at https://yourcovers.com/transpan_9437.php for $260 or search (PML 9437 pan) for more options.
    This pan does not hang down far enough to be a problem and fit my M1123 like a glove.
    good luck with your leak.

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