Flush or Replace OEM transmission cooler

[CHEVYS4ME]

Just trying to figure out if I can safely flush my oem auto trans cooler? I can remove it, flush it, use compressed air to clean out solvent, etc... But want to know if it is recommended? I know some say just replace it. I have a brand new GM remanufactured 700R4 in my 92 c1500 now, but trans before this, and right before I bought it went out. Now I just tore up the front crank thrust bearing, apparently from too much pressure on torque converter pushing against crankshaft and pushing crankshaft forward with pressure wearing out bearing. I'd rather clean it out if it is ok.

Waiting to hear what the experts around here have to say

 

[df2x4]

They're cheap enough that I'd just replace it for the peace of mind. If it's the factory AUX cooler you can upgrade it to a TruCool M7B for $80 and about 15 minutes of trimming the factory brackets down.

https://www.amazon.com/Tru-Cool-M7B-ENGINE-OIL-COOLER/dp/B003TQ7WDA

https://www.gmt400.com/threads/how-to-factory-auxiliary-trans-cooler-upgrade.18104/

 

[454cid]

Are you going to replace your radiator too, or bypass the transmission cooler in it?

 

[CHEVYS4ME]

Are you going to replace your radiator too, or bypass the transmission cooler in it?

That's my next question... I have replaced radiator already with an aluminum 3 row. The trans lines go into radiator trans cooler, and out to front mounted trans cooler, then back to trans. Should I just bypass radiator trans cooler, and just use the new front mounted one only? I am going to get the M7B cooler.

 

[CHEVYS4ME]

They're cheap enough that I'd just replace it for the peace of mind. If it's the factory AUX cooler you can upgrade it to a TruCool M7B for $80 and about 15 minutes of trimming the factory brackets down.

https://www.amazon.com/Tru-Cool-M7B-ENGINE-OIL-COOLER/dp/B003TQ7WDA

https://www.gmt400.com/threads/how-to-factory-auxiliary-trans-cooler-upgrade.18104/

Looks good to me. I will purchase it tomorrow. Thanks a lot for advice, I appreciate it!

 

[df2x4]

Looks good to me. I will purchase it tomorrow. Thanks a lot for advice, I appreciate it!

No problem!

Just FYI I would not bypass the radiator trans cooler. It actually provides a lot of extra cooling capacity and will also help the transmission get up to operating temperature faster. That last part may not be as important to you being in CA, but the extra cooling capacity will come in handy. Ideally I'd buy a new radiator if I were you, but that's quite a bit more money so if you're going to try flushing something I'd do it with that.

 

[454cid]

I would either flush both or replace both, but not flush one and replace the other, unless the one you are replacing needs to be replaced any way..

 

[CHEVYS4ME]

I would either flush both or replace both, but not flush one and replace the other, unless the one you are replacing needs to be replaced any way..

I have a new 3 row aluminum radiator, unsure of trans cooler condition in front of radiator, so I am just going to replace it to be safe. I have a new trans and want to keep it that way.

 

[df2x4]

I would agree that replacing both would be the ideal choice. A new radiator is expensive, but not as expensive as a transmission rebuild. If you're replacing the AUX cooler I'd at least consider doing the radiator as well.

 

[454cid]

I have a new 3 row aluminum radiator, unsure of trans cooler condition in front of radiator, so I am just going to replace it to be safe. I have a new trans and want to keep it that way.

I was under the impression the new radiator had been run with the old transmission. If it has, it's potentially contaminated whether it's new or not. I don't see much point in cleaning one part and replacing the other. Either replace both or clean both.