No OEM transmission cooler 04chevy express 3500

6 litre engine 4L80 trans an no orginal cooler, just a loop of trans line under lower rad surport.




I plan to flush trans. Fluid a swap the internal filter however I don’t know what type of pan I have which determines the proper sized filter?


Here’s the type of cooler I have from Hayden


an how I intend on mounting an connecting the tubes.could this pan have a drain plug?
Thanks for advise

 

I think that's power steering not transmission.

 

yes you are correct. I just crawled under the 3500 an looked.05 chevy Express 3500 transmission cooler install

Normaley when I install a trans cooler I just bypass the radiator an leave the rad. Ports open however the 3500 has a power steering cooler plumbed into the rad. On pass. Side. I assume trans fuild is mixed w/ power steering fuild or doe's the rad. have to differnce sections one for steering an other for trans.?



How would I plug the rad. Ports?



Do the trans.lines that go into the rad. Screw off or are there those redickulous clips hold the lines? If they screw off what size wrench do I need?

Please advise an thanks for any tips.

 

Trans lines. in the rad. are those stupid clip ones. I wouldn't block off the rad. It helps warm the trans. up. It won't shift right if it's too cold (it has a temp sensor). Put in a new cooler after the rad.

 

where do you suggest splice in the new trans cooler? thanks

 

I just found out that loop under rad. core surport is in fact a power steering cooler but appears to only connect to the rack.



doe's this mean the the rad is divided where pass side cools maybe engine oil an driv.side cools trans fuild?

 

I think I may have figured it out cut one of the two trans tubes entering the rad an insert the cooler. so which tube do I insert into? the AI bot on the net suggests I run engine an touch both tubes then cut the cold tube for insertion?

 

ok I'm sorted out on the trans lines

still confussed about the internal trans fliter to order I need to know which type pan I have I think one is deep an other is regular.
why would RA have 4L60 transimsions listed for the 3500 w/ LQ4 6 litre engine

 

GM has done some odd combinations over the years so sites often just list everything. If you have a 4l80e get that filter.

 

Installed the 26K auxillary cooler.Out rad. Sliced into the tube entering the lower rad.port To in coolers lower port. Out coolers top port Back to trans return. I may have these in/outs at cooler backwards?image



Ordered AC delco filter an gasket hope it’s the correct filter for my pan.amazon says a seal is included.my luck the seal is probaley the ring at top of filter) I choose the AC delco bc Wix doesn’t include a gasket.I’m hoping there’s a reusable GM gasket. image.



The dripped out fuild wasn’t totally burnt had a bit of redness but dark red.image

I believe but haven’t confirmed his 4L80 pan indeed has a drain plug notice the indentation in middle of pan, I’ve read the nut is very short so it’s hard to grip. A drain would lessen the mess.

w/ front of van on ramps plan B remove all but one rear corner an one rear side corner of front of pan then slowely lower rear of pan.



****** out the old filter, if the peskie ring is jammed up inside case just reuse it, press in new filter. Line up gasket w/ a couple bolts reinstall pan tightening in 2 pass’s from inside outward snugging. I do have a inch type torquore wrench not sure how to use it on LBs will snug like a spark plug.



Will I be able to tell if this pan has ever been dropped?

Here’s my plan:

1.drop pan replenish what was drained I believe whats in the bottom of pan is unfiltered BC the filters pickup is on the bottom?

2. remove trans tube at top of rad. Extend it w/ additional tubing.

3.run engine an pump out 2 quarts,turn off engine then replenish the 2 quarts.

4.continue to pump another 2 quarts replenish.

I will pump out total of 3 gallons an replenish w/ Castrol dexron4 image.

thanks for any tips