Identifying the final drive ration of a 4L80E tranny

2 messages, Last post on Jul 26, 2009 at 6:47 PM

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#1 of 2 Identifying the final drive ratio of a 4L80E tranny by fjb442 Jul 26, 2009 (5:54 pm)
I just purchased an 02 Deville that had been sabotaged with sugar. There is sugar in the gas tank, the engine oil, and the transmission oil. It has a "Y" engine and I want to replace it with a "Y" engine. I understand the transmission behind a "Y" engine has a different final drive ratio than one behind a "9" engine. My question is how to identify which transmission is the correct on to match up to the "Y". I will be going to my salvage yard to buy both the engine and transmission. The engines are on one shelf and the transmissions on another. I want to be sure I'm getting one that properly matches up. Thanks for any help on this question! Replies to this message: bolivar (Jul 26, 2009 6:47 pm)
#2 of 2 Re: Identifying the final drive ratio of a 4L80E tranny [fjb442] by bolivar Jul 26, 2009 (6:47 pm)
Replying to: fjb442 (Jul 26, 2009 5:54 pm) I would hope a good salvage would have books with this info. Otherwise, I'm no help.