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Sold by: MaxxIndustries
Sold by: MaxxIndustries
(1507 ratings)
88% positive over last 12 months
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Tru-Cool Long brand Transmission Cooler External Thermal Bypass 708-4739P6

4.1 4.1 out of 5 stars 45 ratings

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Product Description

External thermal bypass for large coolers used in cold climates (32 degree -). Installs in cooler line. Includes bypass only! Use on 5/16" & 3/8" line sizes ONLY!! Opens fully at approx. 180 +-. This by pass is included in the Tru-Cool 4739 cooler. Add to the 47391 or any other cooler with 3/8" or 5/16" line. / 708-4739P6 /

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Tru-Cool Long brand Transmission Cooler External Thermal Bypass 708-4739P6


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Customer reviews

4.1 out of 5 stars
4.1 out of 5
45 global ratings

Customers say

Customers like the performance and quality of the auto part. They mention that it works well to regulate trans temps in cold weather and maintains 200 degrees on hot days. They also appreciate the well designed and manufactured part.

AI-generated from the text of customer reviews

6 customers mention6 positive0 negative

Customers are satisfied with the performance of the auto part. They mention that it works well to regulate trans temps in cold weather and maintains 200 degrees on hot days. They also say that it's pretty hard to over cool a transmission, so this is really only needed in areas that see high temperatures.

"using it for oil cooler on Harley. Maintains 200 degrees on hot days, but bypasses cooler until 180 degrees. Best of both worlds." Read more

"...It's pretty hard to over cool a transmission, so this is really only needed in areas that see sustained temperature below 15*F or so." Read more

"...The transmission guy told me this little gadget working very good. Thank you." Read more

"Just installed the bypass valve. Seems to work fine. I can`t wait to test it at lower temperature. Thank you!" Read more

5 customers mention5 positive0 negative

Customers are satisfied with the quality of the auto part. They mention that it is well-designed and well-manufactured. Some say that it's worth the extra money.

"...and finish were any indication of the quality of this product it’s worth buying. Unfortunately I lost it before I could install it...." Read more

"Seems like a well designed and manufactured part...." Read more

"Well worth the extra money for this!..." Read more

"Excellent product. Now my transmission can get up to proper temp in the winter...." Read more

Well worth the extra money for this! Essential item ...
5 Stars
Well worth the extra money for this! Essential item ...
Well worth the extra money for this! Essential item especially in the north and if your bypassing the stock coolers in the trans and adding a external cooler.
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Top reviews from the United States

Reviewed in the United States on November 20, 2013
19 people found this helpful
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Reviewed in the United States on May 26, 2022
One person found this helpful
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Reviewed in the United States on August 12, 2020
Reviewed in the United States on May 28, 2018
One person found this helpful
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Reviewed in the United States on November 2, 2016
One person found this helpful
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Reviewed in the United States on May 16, 2016
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5.0 out of 5 stars Well worth the extra money for this! Essential item ...
Reviewed in the United States on May 16, 2016
Well worth the extra money for this! Essential item especially in the north and if your bypassing the stock coolers in the trans and adding a external cooler.
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2 people found this helpful
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Reviewed in the United States on April 19, 2018
One person found this helpful
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Reviewed in the United States on October 11, 2018
One person found this helpful
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