[cdb95z28]

24298919 is a current relevant ZLE pan. But the 24043537 "looks" like it is similar and for my application, a '22 SS 1LE, it appears the 24298919 pan superceded the 24043537. Take that what you will, but it appears the standoff is at least the same. We just need to see if both have the same overall depth.

[cdb95z28]

I just checked my bro-in-law's pan. He has a 2023 non-1LE ZL1. #24043536


And a few other examples from VIN #s I use.


-2020 ZLE, #24298919
-2022 SS 1LE, similar to mine, Cali car, #24298919
-2023 ZLE, #24298919
-2022 CT5V Blackwing, #24043536
-2024 Collectors Edition ZL1, #24043536
-2025 CT5V Blackwing Precision Package, #24043536

[ZLRob]

Originally Posted by Tay

Thanks for this ZLRob

Which is the A10 ZLE pan?

24298919 or 24043537?

Both are the ZLE pan, however, 24043537 is the superceded part number to the 24298919 part number. So if you call any GM dealer they will sell you a 24043537 pan as the previous number is now obsolete.

[Tay]

Originally Posted by ZLRob

Both are the ZLE pan, however, 24043537 is the superceded part number to the 24298919 part number. So if you call any GM dealer they will sell you a 24043537 pan as the previous number is now obsolete.

Okay thanks a lot.

[ZLRob]

All right men. I officially sit on a non 1LE to a 1LE conversion pan. Using the measurements that cdb95z28 provided, I grabbed a pipe cutter and reached the point of no return by shortening the standpipe to 1LE level. What wound up coming off of the non 1LE pan standpipe was just a touch under .5" total. The pipe still needs some very mild deburring, as I captured this immediately post cut, but this should give you an idea of what the mod looks like. Moving forward, this pan should offer full functionality that a standard pan should have with full drain and fill capabilities, allow the pan gasket less of a chance of allowing fluid leak out due to the fluid level now sitting lower in the pan, and will allow me to have better G resistance within the transmission unit as a whole while and if I choose the track the vehicle. Wins all around!


One item of note, this mod is applicable and valid as the 1LE PN 24043537 transmission pan is the same exact same height at the mounting flange as the base ZL1 PN 24043536 transmission pan using the measurements provided by cdb95z28 as reference.

[SpeZ]

2019 and earlier non 1LE models which use the steel pan have slightly different pan magnets, longer standpipe and use a different oil filter. Overall the valve body unit is newer too.

Upgrading the pan without oil filter might cause oil starvation :/
The newer fluid filter also has a different bolt pattern.

[cdb95z28]

Originally Posted by ZLRob

All right men. I officially sit on a non 1LE to a 1LE conversion pan. Using the measurements that cdb95z28 provided, I grabbed a pipe cutter and reached the point of no return by shortening the standpipe to 1LE level. What wound up coming off of the non 1LE pan standpipe was just a touch under .5" total. The pipe still needs some very mild deburring, as I captured this immediately post cut, but this should give you an idea of what the mod looks like. Moving forward, this pan should offer full functionality that a standard pan should have with full drain and fill capabilities, allow the pan gasket less of a chance of allowing fluid leak out due to the fluid level now sitting lower in the pan, and will allow me to have better G resistance within the transmission unit as a whole while and if I choose the track the vehicle. Wins all around!


One item of note, this mod is applicable and valid as the 1LE PN 24043537 transmission pan is the same exact same height at the mounting flange as the base ZL1 PN 24043536 transmission pan using the measurements provided by cdb95z28 as reference.


Attachment 1172194

Attachment 1172195

Attachment 1172196

Nice! Thanks!

I wonder if you could just press the outer top part of the stand off down further to set a new height.

[ZLRob]

Originally Posted by SpeZ

2019 and earlier non 1LE models which use the steel pan have slightly different pan magnets, longer standpipe and use a different oil filter. Overall the valve body unit is newer too.

Upgrading the pan without oil filter might cause oil starvation :/
The newer fluid filter also has a different bolt pattern.

I'll have to compare filters if that is the case. I know 2020 and up cars started using a Gen 2 valve body or something like that, I know they changed some things but couldn't see why they would change the filter bolt pattern. Either way, maybe there is a workaround to that if that issue indeed exists. Where there is a will, there is a way!


Thinking about it logically though, what is really important is the oil pump pickup itself, and that has not changed through the years. Filters are just that, filters. Magnet locations are not overly critical, they just allow for debris accumulation where they are so it doesn't circulate back through the main set up. Of course the pan is of different material, the change from steel to aluminum is a good thing for obvious reasons.

Originally Posted by cdb95z28

Nice! Thanks!

I wonder if you could just press the outer top part of the stand off down further to set a new height.

It appears that the standpipe outer top part is "cold welded" so to speak. I think if you were to try and press it downward you may wind up causing some trouble for yourself and induce some leakage at the joint location and you may also actually damage the pipe itself. The aluminum is fairly soft.

[cdb95z28]

Originally Posted by ZLRob

I'll have to compare filters if that is the case. I know 2020 and up cars started using a Gen 2 valve body or something like that, I know they changed some things but couldn't see why they would change the filter bolt pattern. Either way, maybe there is a workaround to that if that issue indeed exists. Where there is a will, there is a way!


Thinking about it logically though, what is really important is the oil pump pickup itself, and that has not changed through the years. Filters are just that, filters. Magnet locations are not overly critical, they just allow for debris accumulation where they are so it doesn't circulate back through the main set up. Of course the pan is of different material, the change from steel to aluminum is a good thing for obvious reasons.




It appears that the standpipe outer top part is "cold welded" so to speak. I think if you were to try and press it downward you may wind up causing some trouble for yourself and induce some leakage at the joint location and you may also actually damage the pipe itself. The aluminum is fairly soft.

It looks like the standoff is crimped to maintain position, but I get minimizing the risk of damage.

[ZLRob]

Originally Posted by cdb95z28

It looks like the standoff is crimped to maintain position, but I get minimizing the risk of damage.

Attachment 1172209

Mm... You know the more I examine that area, I can't help but try and wonder how it doesn't leak out from there though you know what I mean? Since the upper part is just an attachment you figure it would have to either have some sealant around it or be so tight that it is cold welded, it's possible that sleeve is so tight on there that crimping it gave it a "cold weld" effect (similar to how you would crimp a battery cable on a lug that is already a tight fit in there that crimping it basically "fuses" the wire to the lug) so that it wouldn't be a leak point and let fluid out through the circumference of it instead of at the top of the pipe if that makes sense.

[ZLRob]

Figured I'd upload this. The filters for the aluminum for the steel pan are indeed different as noted by SpeZ and consequentially are of two different part numbers due to their height and mounting differences. Here are the height differences between the two filters. The one with the orange seal is the aluminum pan version. The one without a seal on it is the new one I just got that fits steel pan version ZL1's. I'd imagine it's actually a little better to have the taller steel pan version filter instead because it ultimately has more filter media and an overall larger filter surface. I really can't see how the difference in filters will cause a potential starvation issue as noted, as technically speaking the taller filter should sit deeper within the pan. I already confirmed it indeed DOES fit within the OEM aluminum 24043536 pan just fine.

[bishopts]

Hey Rob, i can't read inches. Can you do that same thing with a tape that shows mm?

[ZLRob]

Originally Posted by bishopts

Hey Rob, i can't read inches. Can you do that same thing with a tape that shows mm?

The difference at the measured corner that I took them at on both filters is about is 1/8 inches or .125"or 3.175mm. it's so meager that I really can't see how that would do anything at all is what I'm saying.

[ZLRob]

The other next X factor is to determine whether or not temperature at proper inspection ranges will impact how much fluid is used in models using a 203* transmission thermostat and models using the 170* thermostat. I don't know if that will or will not matter but it is something worth noting that will definitely impact how much fluid is to be used. At the specified temperature fluid level check ranges.