The Jetaway converter was stock for the '67 W-30. With a high angle, the stator blades offer a greater oil redirection, increased torque multiplication, increased engine speed, maximum performance, and less tendency to creep at idle. A quick word on shift quality is in order here. Temperature sensor unit machining is an additional cost. For a larger picture, please click on one of the above images. This transmission is known more commonly by the name , although it did receive , adopting the name 3L80. Novak offers a strengthened reproduction of this adapter to replace these broken units, in addition to our superior dual-bearing design.
Inspect the pump gears and body for wear and replace as necessary. When I took the car to the salvage yard, it still weighed in at 3600 lbs. Click on image o view larger in a new tab or window. As to the time it takes for the switch to take place, the vanes are fighting the fluid and only kept in the high position by the fluid pressure applied through the front pump solenoid valve which controls pitch angle. This is similar to somebody trying to start pedaling a ten speed in 10th gear versus 1st or 2nd gear. I have always thought through reading and explanations of how hydraulic dynamics work that a higher stall converter has torque multiplication over a tighter converter, period.
Throwing half the check balls of the valve body over your shoulder, and reaming out the spacer plate, and making the accumulators in the trans non-functional, are not the proper way to modify a transmission. There are two reasons for this: Consistency- Regardless of what type of control system is used, the converter's stator return, from high to low stall, is rather time inconsistent. Please help if you can. This electrical signal is fed into the trans thru the connector on the left side, along with the power for the kickdown solenoid. This feature was not exploited. Also if one is certain that the trans is a 1967 or earlier unit didn't these have the horseshoe-shaped indentation in the tranny pan due to the early-design filter? Changes to the speedometer driven gear need to be addressed if your speedometer is inaccurate. When the key is on, and the switch is on, it will go into high stall.
It's also leaking pretty good. The lower connection is the cooler feed, and the upper connection is the return. The civilian originally had the 3L80s, but the current model has had a 4L80E since the mid-1990s. Some very good, interesting reading there. The forward clutch can be run somewhat tighter since the only time it isn't applied is in reverse. This is a 2 speed automatic.
Behind that, the shaft necks down to about 1. You will see three dimples and a shoe heel impression. Reverse gear ratio is 2. You can interchange the converters. There is no externally visible way to determine whether the transmission contains the straight-cut planetary gear set. So connect to the top outlet at the radiator and then go into the aux cooler and back to the trans. This sprag assembly is the most fragile part of the transmission and the whole assembly should be replaced in ultra high horsepower or big block applications with a special drum that has a 36 element sprag with custom Coan 32802 inner and outer races.
The filter is found in this area of the transmission. Be sure the bellhousing bolt pattern matches the engine that you are using. If I need to add more then I will. Just driving it around the neighborhood a few times, I noticed that the pan was occasionally dripping. A 4L80-E can handle more torque than a 4L60-E. Click on image to view larger. I also have a trany cooler on it.
A switch pitch aka variable vane trans will have two terminals one for kickdown, one for vane angle. You want to examine the larger 1. Other units to include the 2 prong connectors had an internal pressure switch that was used to control spark timing retard. Don't use type F and keep in mind it's incompatible with dex. Floor shifters would be interchangeable between these transmissions, too, with the purchase of a changeover kit that would contain a new shift-cable bracket and the shift indicator lens. The name switch pitch comes from the vanes in the torque converter being able to change their angle pitch in order to reduce friction force and get the vehicle moving. They also made the 64 fit too, but was a 6 month only trans.
Click on image to view larger. These differences only affect the front bell of the case, and all Turbo 400 cases are largely similar from that point back. A few words on the Variable Pitch option. Please see our Buick vendors page for additional info. I went from 9 mpg to 26 with a 401 bored. The became the 4L60 and so on. The Muncie was typically used in high horsepower applications.
Try using to help you lock down what model number you may be looking at. Therefore you can sort of use it as a poor mans over-drive, gear the car higher and let the converter in high stall make up for the lack of a low first gear. Although the overall sentiment is that this is a very strong and durable transmission, some of the most common problems seen are clutch wear and hydraulic fluid leaks. Both 2wd and 4wd versions of the Turbo 400 can be used equally well, and there are no inherent advantages to either one once you have installed our adapter assembly. Photo by Gary Fanning Here is a side view of the trans electrical plug.
Aftermarket converters are still available and several companies can make a converter to order. For a transmission built during these three years, you can identify the transmission as having the switch pitch parts by the electrical connector on the side of the trans case. A separate window or tab will open showing a bigger picture. Shifting ratios were as follows: 1st 2. Remember: There is only 1 pint difference between the add and full marks,it should be between the two at running temp. Th375 and Th475 There are were a few one of versions of the Turbo 400 as well.