Forum | Marketplace | Knowledge Base | | H1 site | H2 site | H3 site
Click Here To Visit Phoenix Hummer Repair
Click Here To Visit Phoenix Hummer Repair
Click Here To Visit American Outfitters, Inc.
Click Here To Visit American Outfitters, Inc.
Click here for a listing of all HUMMER Network sponsors

Hummer Knowledge Base

The Hummer Knowledge Base

An Experiment Using Dryer Vent Tubes to Cool the Transfer Case

I attached 4-inch diameter and 6-inch diameter aluminum flex dryer tubes to my underbody protection with them angled on both sides of the tcase plate. Looks a little weird under there. Obviously not the ideal for Off Road. It changes the ground clearance from 16 to about 9. But 2 hose clamps each and they are off.

I drove at 55-60 mph--could not get the tcase temp above 120. At 65-70 for a while it went to 230 max. Some improvement.. I guess there is some heat transfer off the alum case--or the extra airflow clears out the stagnant heated air in the hump.

I will next try to go to another 6-inch tube and lower the tube openings a bit. This does seem promising.. for street use only..


I tried this system out today--with 2 --6 inch dryer vent Aluminum Flex tubes angled into the 2 sides of the tcase plate. These 8 dollar tubes are attached to the underbody protection via 2 -7 inch hose clamps each. They hold great and takes about 5 min to install..

I have already disconnected the stock intercooler loop. I was going 70 mph-for 30 minutes which is the fastest I have gone in it for a long while-especially with SXs on-probably, add 5 mph for speedometer correction due to the 38.5s.

The max temp I was able to get was 230. This is not too bad. The ambient temp was about 65--unseasonable for this time in PA. Under normal conditions even with the intercooler connected --my temps would get to 250-260, --300 during the summer. You have also eliminated the Intercooler loop fracture risk.. This is all a fair compromise situation.. Nothing beats the simplicity.

At 235 max -from my chart --your trans fluid would provide normal lubrication to 15 k miles and would not get discolored.

I think this is a reasonable option --if you did not want to fuss around with the install of the remote cooler--and all the parts, vulnerability of all the hoses, worry of the fluid levels etc.

Back to main page

The Hummer Knowledge Base is a collection of informative posts from the Hummer Network forums and mailing lists, contributed material and links to outside web sites.
The Hummer Network is not responsible for the accuracy of the information contained herein or on outside web sites, nor for any situation arising from the use thereof.
2006-2011 by The Hummer Network. No material from the Hummer Knowledge Base may be reprinted or republished in any form without permission.