99 lesabre tranny in a 99 SLE - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 01-20-2008, 04:21 PM   #1
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Default 99 lesabre tranny in a 99 SLE

About six months ago i got a salvaged transmission from a 99 lesabre, i had to have the buicks VIN programed in in order for it to work.It only have 30,000 miles on it and it works perfectly, but i noticed that while im in overdrive and going at highway speeds my car only runs and 1,500 RPM.Now my dad has a 98 SSE and his runs at 2000 at highway speeds and climbs hills better. Does anybody know what the difference in gear ratios between the buick and the bonny are?
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Old 01-20-2008, 05:28 PM   #2
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I bet you have the 3.05 gear but the LeSabre transmission has the 2.84 (or 2.86)

That'* my thought, at least.
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Old 01-20-2008, 06:00 PM   #3
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Default trans Codes !!

You will need the code off the original trans, and find out the code for the final drive for the trans in the car now. Newer cars can be checked at the Dealer. Buy i am sure the ones you have wont have it online. I would look into it for you send me the vins from the two cars in a email.Or i know the trans has a code on the metal plate on its back. Let me know, J
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