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Old 06-17-2009, 10:02 AM   #15
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Interesting posts, thanks.

Just noticed that you've recently passed 10,000. Whooee.

See you on the road. Pat
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Old 07-03-2009, 12:41 PM   #16
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Well, I finally got around to taking the truck in about the A/C not working right. For nearly a month now since the midwest rally, I noticed on the way home that the A/C's effectiveness had been significantly diminished.

Though I was extremely careful with the condenser up front when installing the cooler (and cleaning out the radiator fins and A/C condenser fins from the back with air and then water), I had though, what else could it be? How could it be a coincidence?

Well, the leak of all places was nowhere near the front, which let me off the hook. O-Ring that connects the lines to the rear A/C unit broke down...wasn't installed right, who knows. Bottom line, the cooler and the cooler install not responsible, GM protection plan covered the job and the cooler still remains a solid performer both towing and not....and the A/C once again works.
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Old 07-03-2009, 12:47 PM   #17
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Think of the Chevy Bowtie as "protecting" the transmission cooler. My understanding is that the grill of a truck is mostly eye appeal and airflow is not a highly engineered feat to worry about on the front of vehicle.
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Old 07-03-2009, 01:25 PM   #18
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Quote:
Originally Posted by yakman View Post
Think of the Chevy Bowtie as "protecting" the transmission cooler. My understanding is that the grill of a truck is mostly eye appeal and airflow is not a highly engineered feat to worry about on the front of vehicle.
I agree, I think it's engineered to a price point. The protective "Bow Tie" was one of the reasons I went from the tube and fin (OEM), to a stacked plate B&M supercooler (model 70266). Clearly the upgraded cooler does get airflow (about the size of the old cooler) compared to maybe an inch, which it had as stock.

Oh and BTW, I wound up not cutting the stock metal trans lines to the larger 8" tall cooler. I reused the GM quick connects. It's only if you go with the 11" tall cooler that you will need to significantly modify the metal trans lines. So all in all, the longest part is fabricating and installing the brackets for the cooler.
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Old 07-03-2009, 06:47 PM   #19
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Quote:
Originally Posted by Silvertwinkie View Post
One last thing, I used PTFE thread sealer on the adapter fittings. This is suppose to be better than teflon tape or plumber's putty. It is suppose to have a 10K psi rating and be able to withstand 500F temps, of which I hope my trans never ever sees. I think teflon tape is also rated for 500F, but hey, what's a few more bucks for some PTFE thread sealer?
Uh..........I have one little correction. PTFE and Teflon are the same thing. Were you, per chance, referring to the yellow tape vs. the white tape?

Here's a link to Wikipedia on PTFE:

Polytetrafluoroethylene - Wikipedia, the free encyclopedia

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Old 04-26-2010, 03:26 PM   #20
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I pulled this thread back up when a trans cooler question came up. I wanted to share the update that I used the truck several times in the extreme cold up here this winter. I can say that the trans cooler and deep pan did NOT cool my trans fluid too much. I had no issues this winter under a wide variety of operating conditions.

I still would recommend this setup wholeheartedly. I will be adding a Mag-Hytec differential cover next at some point, but first, I'll be getting a tire pressure monitor as I have fully synthetic oils in the truck that can take a bit more abuse than conventional oils can (IMHO).

If you get colder than -25 to -30, I can't attest to it, but at -25 to -30 I had no issues.
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Old 08-27-2010, 04:15 PM   #21
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Silvertwinkie that is a fantastic write up, best I have seen on the web yet!! I have been looking at using the same B&M 70266 cooler but could not find any write ups on the web. Could you provide more detail on how you avoided modifying the stock cooler lines?

The best info I have been able to gather up is that I would have to use a reducing adapter from the stock lines to the B&M.

Thanks
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Old 05-30-2014, 10:12 AM   #22
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Just going through some of my old posts and came across this one. Thought it'd be a good follow-up topic now that we're about to get into the heart of the travel season.

It's now going on about 5 years and about 17,000 miles on these mods and I can say without question it was for sure the right thing to do. No issues whatsoever. In fact, even in -15F this past winter (one of our coldest on record), the trans performed flawlessly. The Amsoil ATF I have in place has a pour point that goes down to -60F (even colder than my radiator fluid will currently tolerate).

In all the truck's transmission temps are consistently below that of the stock setup and I have been completely pleased with the overall short and long term results in all seasons and types of use. Of course, your results can and will vary.

To answer phbiggs' question, though a bit late, yes, I simply took the reducers off the stock cooler and re-installed them (carefully) into the B&M cooler (after putting some thread sealer on them) and connected the factory lines to the new cooler.
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Old 01-12-2018, 12:47 PM   #23
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Just wanted to give a quick update for this thread. It's now been almost 9 years with this setup and it continues to meet or exceed the desired outcome. In both extreme cold (-20 F), high outdoor ambient temps (97 F) and just about everything in between, the cooler and pan continue to flawlessly outperform the stock setup while towing or not. There have been ZERO issues in these 9 years with nearly 40k trouble free miles. This will be my last update on this thread as I think nearly 9 years of use does validate the mods (at least for this vehicle). Your results can and will vary.

PM me if you have questions or want to discuss further.

Happy, safe and cool travels!
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Old 01-18-2018, 05:42 PM   #24
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Silvertwinkie, you deserve an award for an excellent initial write-up and perhaps the greatest follow-up(s) in the annals of the Internet!

I too added an external cooler on the tranny of my '96 F250 diesel a few years ago. That tranny used to heat up to 225F or maybe a bit more while towing in hot weather. The factory's external cooler was ridiculously tiny similar to yours, so I replaced it with a big 9 x 23-inch Tru-Cool unit along with a B&M external spin-on filter kit. Now, my temps have been reduced by 25 to 30F or more, which I'm sure will extend the life of my tranny. It's still pulling flawlessly.
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