FAQS
HOW DO I PROPERLY INSTALL MY NEWLY BUILT 47/48 TRANSMISSION?
Logan has made an in-depth video covering proper install along with other informational videos that can be viewed on the Loganbuilt YouTube Channel. Check out the feed on our Home page
WHAT SHOULD BE TRANSMISSION TEMPERATURE RANGES BE?
Transmission temperature is going to vary on application but a good rule of thumb is to keep the temperature under 220* regardless of application. Above 220* for much sustained time can starve crucial hard parts of adequate oil and cause serious damage. Anything under 180ish* is common and acceptable. I always tend to lean towards “the cooler the better” attitude. Unless you live in an extremely cold environment I don’t believe you can get one too cool.
WHICH APPLICATION IS A NON-LOCKUP CONVERTER BEST FOR?
Non lock up/dump valve set up works best in a sub 5000lb vehicle making less than 1500 horsepower. Heavy vehicles and extreme horsepower vehicles rely on lock up to eliminate the concern of converter efficiency. With current technology we can provide a non lock up converter that has a very high range of efficiency in a vehicle that is lighter than 5000lbs and makes under 1500hp that doesn’t see a ton of street driving. The non lock up converter/transmission combo is the most reliable and consistent. This is because there are no lock up clutches in the converter to wear. Applying lock up is a fluid movement event commanded by electronics making it subjectable to slight timing differences. In an index class such as ODSS 5.90 or various other index’s consistency is how you win races. Taking lock up out of the equation eliminates a variable to change your ET. 5.90 index is by far the most competitive diesel racing class and you just cant give up anything that could effect your race day consistency if you’re gunning for a championship.
WHICH TRANSMISSION COOLER WORKS BEST?
There are a multitude of great working coolers on the market making it impossible to say one brand is better than another. The application is more of a determining factor. If you have a stock HP or small tune only truck that you occasionally haul with, a stock or stock replacement trans cooler paired with a low stall converter will do the job just fine. If you have a higher stall converter in a higher horsepower truck a remote mounted cooler with a fan is a good insurance policy. I have found that the location of the cooler is more important than the difference in brands. I like for a remote mount transmission cooler to be mounted behind the transmission/transfer case with the cooler mounted flat. The fan side should be on the top closest to the floor pan and wired in a polarity in which the fan is pulling fresh air from underneath the truck naturally. Avoid mounting any cooler upside down to the bottom of the bed floor. The cooler must circulate fresh air through it to function properly.
SHOULD I REMOVE THE FACTORY TRANSMISSION HEAT EXCHANGER?
If you live in a climate where you don’t experience a lot of sub zero temperature days the answer is yes. Heat exchangers are known for busting/cracking internally and when that happens engine coolant mixes with the transmission fluid which results in whipping out the clutches in the transmission. If you live in a climate that gets brutally cold it’s a good idea to leave the heat exchanger. A good cooling system and an efficient converter may struggle to ever reach an operating temperature in -30* ambient temperatures. The transmission fluid thickens as it gets colder which effects performance and timing of events inside the transmission.