We sell the service kit or just pan gasket and can combine shipping, just ask.ĭUE TO THE HIGH DEMAND OF THESE PANS THERE MAY BE A ONE TO THREE WEEK BACK ORDER, SO PLEASE CALL OR EMAIL PRIOR TO YOUR PURCHASE TO CHECK STOCK. Gasket and filter not included (use stock parts) Released in 1964 with the model name Turbo Hydra-Matic, it was specifically used for Cadillac and Buick. Magnetic drain plug for easier, less messy maintenance Th400 transmission is a heavy-duty transmission.Boss cast into pan can be machined for a temperature sensor.Machined gasket surface for a secure seal.3/8-inch thick gasket flange will not bend when bolts are tightened.3/16-inch thick wall construction to add strength to the transmission case.It first appeared in cars in 1964 and continued in production in the 1980s. The TH400 transmission is called Super Turbine 400 or Turbo 400 in the racing field and is formally called THM400 for Turbo-Hydra-matic 400. The deep pan has the same capacity as the stock Deep truck TH 400 transmission pan. We also offer an Extra Capacity Deep Pan for these applications, CT part# 34-400-840-DEEP. The pan has a boss that can be machined for a temperature sensor (at an additional charge). The transmission was first available in 1964. If your stock pan has a dipstick receiver on the side of the pan (Dipstick goes into the pan and not the case), This Turbo 400 Pan is not compatible with your vehicle.1970-76 models of Corvette, Chevy, Cadillac, Olds, Buick,.This transmission is found in GMC and Chevy vehicles such as: The PML GM Turbo 400 low profile transmission pan fits cars and trucks with the GM TH 400 transmission. Product Description GM CHEVY GMC Turbo 400 TH400 3L80 New As-Cast Aluminum Low Profile Transmission Pan. Southeast Worldwide Manufacturers - SEA.LUBEGARD® International Lubricants, Inc.TransTec, OEM, Exedy, Borg-Warner or Raybestos.ATSG Automatic Transmission Service Group.This is why the First-to-Second gear change generally feels harsher than the Second-to-Third upshift. This means the internal clutches are heavily loaded at the gear change because they must accelerate that heavy high-gear drum up to speed as quickly as possible. When Third gear is selected, the high-gear drum must immediately accelerate to engine speed. When Second gear is selected, the high-gear drum stops. That's a lot of weight spinning in opposite directions, which tends to absorb power. In First gear, it spins at 82 percent of engine speed (for our example of 6,000, that means 4,920 rpm) in the opposite direction. The high-gear drum is next in line and weighs even more, at 13.5 pounds. The forward drum weighs 12 pounds and is splined to the input so it also spins at 6,000. Let's assume the torque converter and the input shaft are both spinning at an engine speed of 6,000 rpm. Kilgore laid the big components out, and the information is well worth remembering. The Power PathOne key to making a Turbo 400 live is understanding the path the power takes through the transmission. Applying 12 volts to the trans increases line pressure and commands WOT upshifts to be dictated by the weights and springs in the governor. The wiring is simple run one lead from switched battery power to the micro-switch and then from the switch down to the small male terminal on the driver side of the transmission. The easiest and perhaps least expensive way is to install a micro-switch on the carburetor that will complete a circuit only when the linkage achieves WOT. If you have installed a Turbo 400 in place of a Powerglide or a Turbo 350, you will need to install an electric WOT trigger switch. The clue that this circuit is necessary is when the TH400 does not downshift from Third to Second at WOT at a speed of around 40 mph, for example. With trans swaps, this simple point is often overlooked. The factory system uses an electric trigger installed on the carburetor that sends a 12-volt signal to the transmission. Electric WotWhen the Turbo 400 was new, GM engineers decided to employ an electric "kick-down" function instead of the classic rod or cable to signal wide-open throttle (WOT) to the transmission.
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