04-04-2020, 10:30 PM
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#1
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Inside of transmission pan has peeling paint???
Doing a filter swap and when I dropped the pan I notice the inside was painted, and quite a bit of it was flaking/peeling towards the top.
This is a previously owned rig so I don't know the history but clearly the pan has been dropped before since the FIPG is gone and a cork one is there.
Anyone run into something similar? Any advice on how to proceed? I can't imagine paint chips floating around in the trans are great for its health...
Pic below:
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04-05-2020, 01:25 AM
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#2
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Makes me wonder what the heck the PO put in the trans fluid that would eat away the paint. If it runs fine, and there's no flakes visible you can lightly clean off, I'd leave it alone. Unless you want to get some paint remover and just strip the pan completely. Not sure how much time you have on your hands.
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04-05-2020, 03:40 AM
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#3
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Quote:
Originally Posted by gamefreakgc
Makes me wonder what the heck the PO put in the trans fluid that would eat away the paint. If it runs fine, and there's no flakes visible you can lightly clean off, I'd leave it alone. Unless you want to get some paint remover and just strip the pan completely. Not sure how much time you have on your hands.
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So i cleaned it up a little and you can kind of see it in the picture, the paint is bubbling all the way towards the bottom of the pan as well. who knows what happened...maybe some kind of chemical application to remove the FIPG also weakened the paint...
Anyway based on how much its already breaking down I'm going to go ahead and strip the inside with Jasco or something similar.
As far as time on my hands, I have a misfire mystery waiting on parts, and a frozen and rounded nut on my stud holding my cat to my exhaust manifold (replacing those due to terrible exhaust leaks) waiting on an Irwin extractor....so plenty 
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04-05-2020, 07:17 AM
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#4
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Gasket remover spray can remove paint but it doesn't cause it to bubble like that. Probably some other type of chemical stripper was used to remove the fipg.
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04-05-2020, 11:40 AM
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#5
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Are the pans normally painted on the inside?
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04-05-2020, 12:18 PM
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#6
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Transmission fluid is a detergent.
These rigs are 18+ years old.
Any maintenance done, and spraying the pan with brake clean to clean it, is going to degrade the paint.
Add the detergent of a transmission fluid, and bam.
Strip the pan, get some chemically resistant paint, or leave it bare steel.
Or, just get a new pan.
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04-06-2020, 07:38 AM
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#7
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Quote:
Originally Posted by alumarine
Are the pans normally painted on the inside?
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I don't know if it's actually paint but they do have a black coating on the inside.
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1. Black 2002 SR5 4x4 5vz: Front Toytec Ultimate coilovers/eibach 600#, SPC UCA, durobumps Rear Bil5100/Superflex, SS adjustable panhard, PCK, durobumps Body Lift 2" 4crawler Tires 315/75/16 BFG KO2 Wheels SCS F5 Matte black 16x8 3.5bs Armor Custom bolt on rock sliders (no frame drilling)
2. Black 2001 SR5 4x4 5vz: stock
3. Black 2018 TRD Pro (wife’s): Armor Custom bolt on rock sliders (U-bolts)
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04-06-2020, 11:11 AM
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#8
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This happened on mine as well. I think its more related to a high heat scenario with overheating occurring. Doesn't take much heat to get paint to bubble. Especially transmission pan paint, Im assuming they didnt put the most heat resistant paint in there lol.
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04-06-2020, 06:07 PM
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#9
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When I pulled the pan on my '02 it definitely looked powder coated to me. IDK. I'd probably source a replacement Toyota pan FWIW.
Cheers!
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05-01-2020, 02:33 PM
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#10
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I have the same issue just not as bad as OP. I recently replaced the OEM filter and stripped the drain plug on re installation. Drain plug is tight for now but I have order a new pan partly because of the paint and also the stripped bolt. Am I ok to run it until the parts arrive with regards to the paint? I don't want to gum up the new strainer I installed or worse ruin the transmission but it didn't seem nearly as bad as OPs.
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05-01-2020, 02:36 PM
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#11
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Follow up question, lol. Does the transmission draw its fluid through the strainer only or is there another path to the internals from the pan. Just curious if the strainer should catch most of the paint flakes before gumming up the internals. I understand that the blocked strainer could be just as bad since it would starve the transmission of fluid/overheat but curious as to how it all works.
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05-01-2020, 03:20 PM
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#12
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Quote:
Originally Posted by fourfive
Gasket remover spray can remove paint but it doesn't cause it to bubble like that. Probably some other type of chemical stripper was used to remove the fipg.
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Bingo. This is it.
The OEM Orange FIPG turns into basically concrete after 15+ years.
Whoever removed the pan last used a chemical stripper to get rid of it.
That chemical stripper caused what you're seeing.
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