The prior year's transmissions were muncie sm318. The first digit of the Identification Tag will be the model number. Contact seller for limited warranty part details, qualifications, and possible labor coverage. The 6L80 Hydra-Matic transmission is a 6 speed automatic transmission manufactured by General Motors. These Muncie 4 bolt cover transmissions get a bad rap, when used with stock column shifters. Transmissions are marked and identified by: - Casting numbers on the case, extention housing and side cover on manual trans.
In most cases if someone has told you that you are looking at a 700R4 and you count 16 bolts you can be reasonably sure that you have found what you were looking for. Below are two different Adapter set ups I have seen, so it may be that they use different ones for different trans missions. Its common on the 66 titled trucks. The brake on the back is a drive-shaft propeller shaft parking brake, used on many large trucks. See the pictures below to help you tell if you have the right transmission. The 6L90 has a beefier set of gears and many internal upgrades.
Thought on the 66 with no 66 stuff. To the untrained eye, nearly all look the same. Tim - part of the family for 50 years - part of the family for 14 years - now part of Dave's family - If you have to stomp on your foot-pedal starter, either you, or your starter, or your engine, has a problem. The 6L90 is a heavy-duty version of the 6L80 six-speed automatic, with a strengthened input gearset that has two additional pinion gears six in total and a strengthened output gearset that uses wider gears than the 6L80. Features include a phosphate coating on the shifter lever to reduce friction and make shifting easier.
We are dedicated to giving you the technical support you need, when you need it! Conveniently, the main transmission that the 6L80E is going to be confused for all have a different number of pan gasket bolts. It began replacing the transmission in many vehicles starting in the 2006 model year. They came in both V8 and six cylinder models. Try using the method above to figure it out. My green 65 is titled as a 66. The information contained on this website is proprietary information of General Motors protected by trademark, copyright, and other intellectual property laws.
They are the exact same transmission. This is certainly the easiest way to identify it. Just keep scanning it until you find the one you are looking for. If you can live with the non syncro first gear, and get a good floor shifter with possitive stops, it will last a long time. And represent it as such.
Still looking for more info. I am still driving the truck like I stole it to break it in with the air charger. I had one of those boxes in the second pic back in the day and they had other issues besides the synchro deal. The automatic is now very much an accepted performance component. Chevy Automatic Transmission Identification: Other Methods Some transmissions have a code stamped onto them. United States Army Drill Sergeant J. Ford led the design of the 10-speed transmission, as well as filing the design patents for said transmission.
The 6L80E went mostly into large vehicles with V8 motors. Modular Design The modular concept of the Hydra-Matic 6L80 centers on the desire for common components and manufacturing tooling for four different size variants of the six-speed family. It would certainly be in your best interest to ask what components were replaced. Thanks for all the advice guys, this place rocks! Enjoy your 5 speed, I love mine! Bishop I definitely recommend a look at these transmissions, you've got to have a look. By using this site, you acknowledge and agree that, other than downloading or printing a single copy of a particular work for your own personal use, you are expressly prohibited from reproducing, distributing, selling, or displaying any of the works contained within the website in any other manner without the express written permission of General Motors. Not to hijack the thread but thanks for the good word. My truck was built in April of 65.
How To Tell One Popular Slushbox From Another In the old days, automatic transmissions were scorned by any self-respecting hot rodder. I thought they all came with back up lights in 66 too. The 6L90 shares about 75 percent of the parts as the 6L80, although the case of the 6L90 is 35 mm longer than the 6L80 case. It has a line pressure tap for diagnostic purposes. You may also find these articles useful:. Which one you use is going to depend on whether or not the transmission is in or out of the vehicle.