![]() With everything cleaned and checked, it’s time to begin the rebuild of our 4R100. They also upgrade the unit to the full spline style (bottom) if yours is a half-spline style for more durability and longevity. Remac checks the spline for wear and replaces the clutch drum as needed. There are two styles one has less spline engagement (top). This is the forward clutch drum, and it is used in all 4 forward gears. ![]() Of course, it will be replaced with a new unit. It’s surprising that it didn’t fail with this much wear. The overdrive ring-gear for our 4R100 transmission only had 15 percent of the teeth left on it. All of them show signs of wear, and only one is even worth considering for reuse. Here you can see three different overdrive ring-gears for the 4R100 transmission. These wear parts will be replaced with new and better components, as is standard, regardless of condition. The inspection process revealed that the clutch fiction plates were worn and showed signs of heat damage. 002 tolerance for maximum efficiency and long life. Remac always checks these pumps and machines them to a. These positive displacement pumps work best with tight clearances in image B, you can see that this pump housing is warped. ![]() The transmission pump is a Gerotor style unit. This is the actual transmission the aluminum case simply holds the parts that make up this assembly and allow it to mate to the engine and driveline and contain the valve body mounting flange and fluid passages.ĢA/2B. Here you see the actual heart of the Ford 4R100 transmission. We install our new 4R100 and take it for a test drive.ġ. Subscribe Our Weekly Newsletter NEXT TIME: (This type of long term idling is usually found on work trucks that are virtually never turned off.)įollow along, and we’ll show you the highlights of what it takes to make a superior 4R100 transmission that will meet your needs and perform great for work and play. In addition, a stage-3 rebuild is more likely to overheat when idling for extended periods than the milder, stage-2 build. The stage-3 rebuild, Remac explained, is really for extreme duty, race applications, and might be too harsh for daily use. The stage-2 is best for normal to heavy-duty use. For this type of usage, Remac recommended a stage-2 rebuild for better durability and drivability. It used to haul parts and tools for a local diesel shop and as a daily driver would tow trailers of all sizes. The truck we’ll be installing this upgraded 4R100 into, however, is a workhorse. While stage-1 is a little better than stock, it is only recommended for light-duty use. To learn about the upgrades available for the 4R100, we contacted Remac Transmission: They explained that there are generally three options, a stage-1, stage-2 or stage-3 rebuild. Though it’s a good transmission, the 4R100 can be made be better. However, like any high-mile automatic transmission, your 4R100 is sure to have some wear that should be addressed before you pump more power through it. Close inspection is required to ensure that all transmission parts are either replaced or repaired as needed and that all required repairs are made to the system as a whole. Age is not the only reason for transmission failure: One example is overheating due to a bad transmission cooler. Often, trouble with the transmission can point to other issues. Once your automatic transmission is at the shop, it will be disassembled, cleaned, and the parts will be inspected. While some grumble about their durability, the truth is, the 4R100 has performed well, and thousands are still on the road today. This means that most of the Ford F-250 and F-350 trucks that run this automatic transmission have seen a lot of miles. The 4R100 is a computer controlled 4-speed automatic with a 1,000 lb-ft capacity from the factory. The Ford 4R100 automatic transmission was introduced in 1999 and was mated to the 7.3L Power Stroke diesel engine.
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