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Jun 28, 2022 | 12:21 AM

Baworkman

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4th Gear

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Hot transmission

Hi all, looking for some help here. I have a 2005 Excursion V10 with 125,000 miles. We have been towing our same 34 ft camper with it for the last 5 years. Last year I put bigger size tires on it and on our trip out to colorado from Minnesota the transmission seal softened and begin to leak a bit but it never overheated. When we got back from our trip I thought the only difference from our previous trips were the larger tires so I switched back to the stock tire size. I also had the seal replaced, replaced the stock torque converter with a 3 disk torque converter and put an extra in line transmission cooler on it. Now with all that work, my transmission is running hot. Any ideas? Could it be the new torque converter is bad?

Jun 28, 2022 | 12:56 AM

R&T Babich

Fleet Mechanic

Joined: Feb 2011

Posts: 1,812

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From: Thousand Oaks, CA

Quote:

Originally Posted by Baworkman

.... and put an extra in line transmission cooler on it. Now with all that work, my transmission is running hot. Any ideas? ....

Does the "extra in line transmission cooler" have 1/2" tubing, if not, it may have increased line pressure reducing flow.
The most common upgrade is to use the 5R110 aux cooler to replace the small OEM V10 aux cooler.
The 5R110 cooler bolts in where the OEM cooler mounts and has 1/2" tubing.
Another possibility is the cooler bypass may be kicking in because the spring has weakened or there is a cooler line clog.
Have you run a flow test of the cooler circuit?

Jun 28, 2022 | 08:36 AM

pirate4x4_camo

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Joined: Apr 2011

Posts: 8,259

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From: Northern California

Keep in mind that the radiator and its built in trans cooler are still the primary means of cooling for the both the engine and trans so when trying to sort out heat issues factor in the entire system.

everything is suspect from a 20 year old radiator dying a slow death to a failed clutch fan or faltering water pump and even the less obvious things like the rubber mat air dams and shrouds that force the air through the coolers inside of around them when the fall off or don’t get put back in place correctly

Jun 28, 2022 | 09:18 AM

R&T Babich

Fleet Mechanic

Joined: Feb 2011

Posts: 1,812

Likes: 88

From: Thousand Oaks, CA

Quote:

Originally Posted by pirate4x4_camo

Yes, anything may have restriction so a flow test would ensure the lines/coolers are at least allowing the proper amount of fluid thru.
I have 3 coolers - radiator tank, 5R110, B&M and an inline filter, each cooler drops the temp about 20-30 deg each.
The 5R110 and the B&M coolers use 1/2" tubing, so even with the huge increase in cooling surface area my line pressure is within 1 psi of the OEM setup.

Jun 28, 2022 | 04:55 PM

Baworkman

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4th Gear

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we have, everything is flowing like it should....i will check the tubing on the new cooler. thank you so much!!

Jun 28, 2022 | 04:57 PM

Baworkman

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we have checked the flow and it is good.....i will check the 1/2" tubing. thank you so much for the info!!

Jun 28, 2022 | 05:00 PM

Baworkman

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4th Gear

Joined: Jun 2022

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we put a new radiator in last fall....hit a deer. i took the front license plate off as it was pushing the air down to the ground instead of into the radiator. thank you for the help.......this is a great place to go for info and i appreciate your time and help!!