From this point is where the options just begin. 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. Do not include the tailshaft housing which bolts to the rear of the case. No longer do you have to be limited to using a powerglide transmission to get a high performance transmission case. Do you place the blanket around the main casing of the tranny around clutches, planetary gearsets, etc or does it indeed go around the bell housing in case the torque converter blows? Adjustable nylon straps with steel buckles make it fit the transmission nice and snug. One of the attributes that is credited with providing this strength is the cast iron center support.
This transmission became well-known for its strength and was very popular, based on its life and the number of applications in which it was installed. When I first came upon this issue I had a coverter that would flash off the foot brake to about 3600, that was the Drag Week '06 situation I wrote about where with the full blanket effect it was hitting 220 and dropped to 180 after creating the scope effect. I still drive my truck a lot on the street when I'm not pulling, and I don't want to compromise that ability. This 3 speed transmission has its gear ratios defined as 2. We are dedicated to giving you the technical support you need, when you need it! Look at the transmission pan. It is highly regarded for its supreme durability. If that works out all I have to add is some driveshaft loops and I'll be at class specs.
Some areas are cast iron, such as the center support for the transmission. A Turbo 400 trans shield provides safety for the vehicles driver, track personal, crew members and spectators. While this setup has always passed tech, it does potentially defeat the purpose of the blanket somewhat. The part of the pan at the rear of the transmission looks like the lower part of the state of Texas really. This transmission eventually made its way into many of the truck applications for General Motors. So far it is competitive enough to place in the top 5 at any event, so need to make it safe now, then start adding more power. A scatter shield is one of the most important safety items you can install on your vehicle.
I know on a manual trans they put scatter shields around the clutch in case it comes apart, but I've never heard of a torque converter exploding. Bishop I definitely recommend a look at these transmissions, you've got to have a look. My biggest unknown is where to place the blanket? Re: Automatic transmission blanket Thanks for the input Bill. I'll have to keep an eye on the temps on the street, because this thing definitely gets driven on the street and off-road, in the woods and in the mud, snow, etc. He didn't have a balnket on the car even though he should have according to the rules and the tech guys didn't check. I don't bitch about having to run the blanket anymore. Overall this transmission was in production for 27 years, and to this day is commonly used for many aftermarket applications.
This transmission is known more commonly by the name , although it did receive , adopting the name 3L80. So yeah I'd conclude that stall speed does effect trans temp as you would think and insulating the trans with a blanket doesn't help. I run a deep sump aluminum pan with the cast in fins which clearly helps too. From there it's a long no corners cut process to build one of the best 3 speeds available. That being said, a common fill volume is between 11-12 quarts for a stock transmission. Chevelle on motor and at the Pinks All out in Sonoma a couple years ago launching on the transbrake when his Turbo 400 locked up internally, shattered the bell housing, ripped off the tailshaft mount and the whole case rotated several times inside the trans tunnel tearing it to pieces and ripping big holes in the floor.
Performance Transmissions is scheduled to be available for sale September of 2011. Any experiences with one of these blankets? Solution two was to fold back the bottom edges of the blanket onto the sides of the trans and only have the straps under the pan. The new Turbo-Hydro 400 Ultra Case made by J. They bolt to the belt housing, ensuring that they stay in position. Re: Automatic transmission blanket Excellent, thanks Jim, guess I should have searched through their website first. The pieces missed his feet and leg by inches.
Measure the transmission case with a tape measure. The stock transmission case can deflect, distort and break in modern performance and racing automatic transmissions. It actually has five sides. The Turbo 400 transmission was a 3 speed automatic transmission developed by General Motors. When it shifts from 1st to 2nd its got a really smooth shift and it puts a smile on your face. Also, does anyone know if there is any problem with using one of these on a street driven truck? Overall the transmission remained in production an impressive 27 years before it was eventually replaced by a 4 speed electronically controlled transmission, the , in 1991.
For models with standard bells we only use H. Blanket is made from ballistic nylon with a protective nylon cover over it to protect from oil or moisture soaking into the restraint. The first solution was to loosen the straps so that the blanket hung down below the pan a couple inches forming a kind of 'scoop'. My mostly stock 460 doesn't make nearly enough power to break anything yet, but I can see the need for one in this class once I start adding power. I don't use the locating straps shown in the picture as once the trnas is in position in the tunnel the blanket is squished between trans and tunnel and can't move anyway.