WCFab 2017-2019 L5P Duramax Transmission Cooler Thermostat Bypass Plug

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Keep your L5P Duramax Allison 1000 6 speed transmission from running too hot with the WCFab Transmission Cooler Thermostat Bypass Valve. The OEM valve tends to stick on both stock trucks and those built for performance. As a result, the transmission runs hot - even in the red zone - at the track for WCFab's shop truck.
• CNC Machined Billet Aluminum Thermostatic Bypass Plug
• Black Anodized Finish
• High-temperature silicone O-ring seals
• Reduces fluid flow restriction to trans cooler
• Simple Installation
• Experience fluid temperature drops from 15-50 degrees F
• Direct replacement of the failure-prone OEM thermostat
• Easy swap back to OEM set up for cold weather use
Part Number: WCF100469
Learn More: www.wcfab.com/i-31644280?q=wc...
_________________________________________________________________________
Wehrli Custom Fabrication Inc. specializes in high-performance diesel upgrades and custom metal fabrication. We take enormous pride in our reputation for creating the highest quality fabricated parts and upgrades for your Duramax, Powerstroke, & Cummins diesel truck. We offer turbo kits and custom performance parts for work, play, or competition. With the purchase of any of our custom fabricated MADE IN THE USA parts, you will receive the best fitment, performance, and customer service. Whether you're looking to outfit your towing rig with our popular S400 over stock compound turbo kit, or if you're looking for four-digit horsepower, we can deliver.
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Опубликовано:

12 авг 2020

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Комментарии : 42

@SGaryNinja 9 месяцев назад

It would be cool if there were an add-on that would connect to the ports of that block and would have a 90 degree lever on the side. Position 1 is factory thermostat set up and position 2 is full bypass mode.

@jasonlovell3934 3 года назад

It seems to me that unless transmission temperatures exceeds or match coolant temperatures then the bypass is working. And has anyone answered the question of what temperatures the Allison engineers intended for the stock transmission to run?

@Jeff-dc2xl 2 года назад

I live in East Tx and it'll run about 187 degrees unloaded in the winter maybe 176, the highest I've seen is like 192 193. Since I put the bypass plug in the hottest I've seen is like maybe 160 but it take a good little while for the trans temp to heat up past 130-140. We haven't made it to winter yet so I don't kno what it runs like in cooler weather say under 60 degrees outside

@rizaptor7005 3 года назад

Cold weather full flow really isn't that big of a deal. Just think about how many years we've had no thermal bypass valves and many a transmission survived.

@Richkuenneke 2 года назад

But they're talking about built transmissions.

@mrrude86 3 года назад

Is the part also compatible on the 6l80e & 8l90e transmissions?

@WCFab 3 года назад

Yes, this part is also compatible with GM gas engine vehicles equipped with the transmission thermostat bypass. Check out the compatible vehicle list on our product page in the link below and give us a call at the shop (630-277-8239) with any additional questions. www.wcfab.com/i-31644280-2017-2019l5pduramax-transmission-cooler-thermostat-bypass-plug.html?ref=category:1460257

@jcesparza7490 Год назад

Just got this on the mail, however it came without any o rings. 😢

@WCFab Год назад

Hey JC, thank you for being our customer and for sharing your purchase experience with us. Please accept our sincere apologies regarding the missing hardware. Looks like we received an email from you last week as well and our team has responded there as well requesting confirmation on a few details so that we can get the missing components on the way to you.

@scottwillis2812 Год назад

I’ve seen where you should put stock part back in during winter (Pennsylvania) is this true?

@WCFab Год назад

You can absolutely run with the bypass in through the winter months, just keep in mind that the transmission will warm up more slowly (just like 2016 and previous trucks would have) and drive the truck accordingly. Because swapping this part out is so simple, our advice is if you live in an area of the country that routinely sees temps approaching or below zero during the winter, make swapping the thermostat assembly back in part of your fall maintenance routine and then swap the bypass back in again come spring.

@scottwillis2812 Год назад

@@WCFab fall maintenance routine! Guess I better learn what that is! Thanks

@sierradumpsterrental7421 2 года назад

Is there such thing as to low trans temp? Iv been running this bypass all summer here in California but now the outside temps getting lower im just wondering if the trans temp needs to be a certain temp to operate efficiently. I don't see my temp getting above 125 and at times its almost 100

@WCFab 2 года назад

Those fluid temps that you mentioned aren’t anything that we would be concerned about. If you are not seeing air temps in your region of well below freezing, you should have no issue running with the bypass in year round.

@socanyou2714 24 дня назад

So if Im in Oklahoma does that mean during winter I should replace my thermostat?

@Ibelieve350 3 года назад

Does that part void warranty

@WCFab 3 года назад

We're don't foresee warranty concerns related to this part since it actually reduces the potential for damage from high fluid temperatures and the installation is easily reversible. That said, our experience is that dealer approach to aftermarket parts and warranty claims varies quite a bit depending upon who you talk to, so we always recommend speaking to your dealership service manager before making any intended modifications to a vehicle that's under warranty.

@user-tj9ks1zv7k 3 года назад

If full flow is better which makes sense why do they have an OEM thermostat bypass in the first place?

@WCFab 3 года назад

Smitty the thermostat was added with the intention of allowing the truck to use the warmer engine coolant in the radiator to speed the warm up process of the transmission for improved operation from initial start in cold weather climates (first portion of the animated thermostat closed diagram in this video). This actually works, which is why we allow for the original parts to be swapped back easily for customers that live in an area of the country like we do where temps can drop well below freezing in the winter time. The problem comes when you’re working the truck hard in warmer weather and the closed fluid circuit continues to bypass the auxiliary cooler causing the trans fluid to continue to heat soak until it exceeds coolant temperatures and reaches a point where fluid breakdown and internal component damage can occur.

@rizaptor7005 3 года назад

@@WCFab don't forget the quest for every little bit of mpg improvement.....

@diver6843 3 года назад

@@WCFab so you would suggest swapping it back and forth depending on time of year. I live in Canada and it gets very cold. But I tow a 13k fifth wheel in the summer on an all stock L5p.

@WCFab 3 года назад

@@diver6843 Absolutely. Lots of guys do that in cooler climates.

@eknelsongroupllc6270 2 года назад

Is this compatible with 2022 6.6 LP5 Duramax?

@WCFab 2 года назад

This product is specific to the 2017-2019 L5P Duramax trucks with the 6 speed Allison.

@eknelsongroupllc6270 Год назад

@@WCFab Has the factory bypass valve issue been corrected for 20+ or will the be an aftermarket upgrade available in the future?

@WCFab Год назад

@@eknelsongroupllc6270 The thermostatic bypass valve is now internal to the 10 speed transmission. We like using the Ratio Tek shift kit to address the issue on the latest generation trucks.

@roybradshaw3650 2 года назад

I'd buy it but not for an added $23 in shipping. That seems a bit much for something that should cost $5 for shipping.

@WCFab 2 года назад

Thanks for your interest in this part and comment regarding shipping costs to your location. Unfortunately shipping rates for various destinations and package sizes are set by the carriers. If you don’t have any other items that you could combine on the order to spread out the shipping costs, you might try reaching out to some of our dealers to see if they can offer you a better rate from their stocking locations.

@SDDevelopment 3 года назад

I guess linco didn't get their patent in time

@KonigWolfx 3 года назад

Right. I laughed when he said "WC was the first to design and use this piece." I had already purchased Linco's well over a month before WC even announced theirs. At least with Linco you can also buy extra o-rings/snap rings.

@SDDevelopment 3 года назад

sure is a shame. If you know, you know. +1 for Linco, and now there's one less manufacturer I have to consider for customers. I'm very new to the manufacturing industry but it seems that it's not about whether you are capable of engineering and developing a product, it's whether you do it first, or better than the last guy.

@WCFab 3 года назад

Hey Guys, to clear up some things here is the low down; We are in fact the first to design and use this part. Just because it was not for sale on our website, or we had a video posted about it before another manufacture, does not mean it wasn't being sold and used by us long before. We have been using this component since early 2019 in our race truck and in conjunction with every Performance Transmission build that we performed here. After while we saw the need for the component and its benefit not only for built transmission applications but also for bone stock applications, especially when we started to realize how many OEM valves were sticking closed as our initial reason for the component was increased flow to the cooler for built transmissions. Which is why we started selling the part solo. So it was in use by us for nearly a year before it was released on the market as a purchase alone item. Hope that clears up some misconceptions in regards to "who was first" as WCFAB does not copy, we have lead the way in product innovation for many years especially in regards to L5P. @HP Motorsports, sorry that you feel that way about not wanting to recommend our product line to your customers, but remember who was the first to do nearly everything high performance related with the L5P platform, and who it is that still has the fastest and highest horsepower L5P. Thanks for watching and please reach out if you have any other questions.

@allamerican7830 2 года назад

Can I run this in the winter time? I’m in the Midwest where it gets below freezing but I use my truck for snow removal and I noticed last year my trans fluid was almost 200 degrees while working the truck. I’m thinking I could get away with using this all year long as in the summer time I pull a 16 foot enclosed mowing trailer. What are your thoughts?

@WCFab 2 года назад

You can run with the thermostat bypass plug in during the colder months. The truck will behave just like earlier model years which take longer to warm up the transmission in cold weather. Our temps here can drop well below zero Fahrenheit so we opt to swap the thermostat assembly back in for the winter as part of our fall maintenance routine since it's only a few minutes to change everything out.

@onlyeasydaywasyesterday 8 месяцев назад

So is there no 2000 to 2024 of this thermostat bypass plug

@WCFab 8 месяцев назад

The thermostat is internal to the newer 10 speed transmissions. The Ratiotek shift kit in the link below offers a bypass solution for the 20+ Duramax trucks as part of what it includes: www.wcfab.com/i-31644991-2020-2023-l5p-duramax-ratiotek-allison-10-speed-shift-kit.html?q=Ratiotek

@onlyeasydaywasyesterday 8 месяцев назад

@@WCFab why do all these vehicle manufacturers actively try to make things harder for people to make their trucks run better

@onlyeasydaywasyesterday 8 месяцев назад

@@WCFab like your guys 17 to 19 thermometer cooler bypass super easy Pop the other one out pop the new one in boom done 10 minutes so they're like yeah we need to change that so it's harder for them to do something that makes the truck run better I will never understand that like you would think that the manufacturers would want their trucks to run better so they would do this stuff before so the guys that buy the vehicles wouldn't have to do it

@jacobkrzyzek5777 2 года назад

Will this work on the 6L80 transmissions?

@WCFab 2 года назад

Yes, we’ve confirmed that this part is cross compatible with the thermostat blocks found on the side of the 6L80 transmissions as well!

@jazzgnm5131 Месяц назад

Do you have these for a 2020 duramax ?

@WCFab Месяц назад

The location of the thermostatic bypass valve changes on the 20+ Duramax trucks. It moves from the block shown in this video to a location inside the 10 speed transmission. We like using the Ratiotek shift kit in the link below as a solution to that as well as for its ability to firm up shifts and increase holding capacity in tuned performance applications or heavy towing use: www.wcfab.com/i-31644991-2020-2023-l5p-duramax-ratiotek-allison-10-speed-shift-kit.html?q=ratio