The 4T80-E Cadillac transmissions are one of GM’s Turbo-Hydramatic front wheel drive family of automatic transmissions or transaxles. These transmissions are well known for ruggedness and reliability.
Starting in 1966, GM had to make a dramatic change to its transmission line, when they introduced front wheel drive Oldsmobile Toronado, front wheel drive units were necessary. Cadillac received the new tranny assembly in 1967 in the front wheel drive Eldorado. The rest of the front wheel drive story is important to the history & future of automotive transmissions.
The 4L80E is designed to handle more horsepower than the lesser transmissions or transaxles, to be more accurate. Used only in Cadillacs with the powerful Northstar engine system, the 1995 to 1999 Oldsmobile Aurora Autobahn and 2005 and 2006 Pontiac Bonneville GXP.
For rebuilders, this transmission is a handful. Not only is it big, but it needs to be rebuilt with the precision of a brain surgeon. Ideally the transmission should have been diagnosed before removal. This is a benefit to the rebuilder. It is not imperative though, the rebuilders who take pride in their work take the time to do everything right, including all updates.
Without even discussing the matter, every electrical component inside the transmission should be changed with factory original components, right off the dealers shelf. Using a rebuild kit with factory original or better components and an honest, knowledgeable and well trained transmission mechanic is the recipe for success.
In reality, the removal and installation is just as important as the rebuild itself. The R&R (removal and replacement) person is removing and disconnecting wire harnesses and some expensive components which can be damaged if the R&R person is not just careful, but knowledgeable about the subject, and does not mind reading the directions if needed.
This makes flushing out the gunk in the radiator more important. In fact a good examination of the radiator and it’s supporting cast is a great idea at this point. Even superman had his weakness, and this transmission does not have many weaknesses other than performing regular maintenance using synthetic transmission fluid.
My best advise if you need to replace your Caddy Tranny is to call the transmission replacement company that outperforms all of their competition by making sure the value is literally built into your replacement transmission. By making sure we cover all of the bases for you, you can take care of buying the correct transmission fast and at an affordable price. Call GotTransmissions.com @ 866-320-1182.