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Cadillac STS/STS-V: Transmission

19 messages,  Last post on Mar 14, 2007 at 2:35 PM

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What is this discussion about? Cadillac STS, Cadillac STS-V, Transmission, Sedan

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#13 of 19 magazine tests Re: 2007 ratios [sls002] by rayainsw May 22, 2006 (6:45 am)
Replying to: sls002 (May 22, 2006 6:29 am) “I am sure that the magazines will test the six speed automatic at some point.”   That’s actually something I was thinking about this weekend:   Will the magazines see enough different \ improved for 2007 to warrant publishing a(nother) test of the STS?   With the availability of a six speed (in place of the really old four speed) automatic on the 2006 Corvette being the only significant mechanical \ performance change compared to the 2005, it took over 6 months for any magazine to publish acceleration numbers. And (as far as I know) still no one has published a full test.   Unless there is a $60K – $65K Luxury Sedan Comparison test in the works, I doubt we’ll se a test of the 2007. The six speed and Brembo availability are just not enough different to justify re-test.   But I could be wrong.   - Ray Likely depending on my finely calibrated ‘butt dyno’ during test drives to evaluate the 2007’s acceleration. Replies to this message: sls002 (May 22, 2006 6:52 am)
#14 of 19 Re: magazine tests Re: 2007 ratios [rayainsw] by sls002 May 22, 2006 (6:52 am)
Replying to: rayainsw (May 22, 2006 6:45 am) With respect to the Corvette, the 6 speed manual transmission is the first choice of serious sports car drivers. What I would expect is a comparision test sometime or perhaps a short take on the six speed. My guess is that there might be a comparison test, but a lot depends on how the STS's competition changes too. If the only change for 2007 in the STS class, is the STS's six speed transmission, then probably no test will be in the works.
#15 of 19 Re: Gearing [sls002] by lakerunner4h Dec 27, 2006 (6:52 am)
Replying to: sls002 (May 23, 2006 7:12 am) I've measured fuel economy against final drive gearing (i.e. engine rpm in highest gear) in my last 8 cars and consistently found that, surprise surprise, the lower the engine rpm at any given speed -- the higher the fuel economy. I've have 3 GM vehicles with the 3.8L OHV V6, two with a 3.05 final drive ratio, and one with 2.86. The car with the 2.86 ('03 LeSabre) consistently deliver 10% or so better economy than did the two with the 3.05 ratio ('96 Riveria and '98 Intrigue). Had an '01 Aurora with the 3.5L OHC V6 in between -- with a 3.29 final gear, and it consistently delivered 10 - 15% poorer mileage than the cars with the 3.8L and numberically taller gearing. Interestingly, the seat-of-the-pants performance among these 4 cars differed little -- the Intrigue was actually the "sportiest" one of the bunch. So much for lower gearing translating to better apparent performance. Replies to this message: dmathews3 (Mar 06, 2007 2:02 pm) lakerunner4h (Mar 14, 2007 2:35 pm)
#16 of 19 '05 STS Cadillac Tranny Harsh Shifting by jsc7 Mar 06, 2007 (12:19 pm)
Have '05 STS with 25K mi - with harsh shifting - 5L40-E tranny smooth as silk until 21K mi shifting is now harsh in all shifts except 1-2   Any ideas ?
#17 of 19 Re: Gearing [lakerunner4h] by dmathews3 Mar 06, 2007 (2:02 pm)
Replying to: lakerunner4h (Dec 27, 2006 6:52 am) Unless all the cars weigh the same it is still hard to figure difference in mileage. The Intrigue I bet was a whole lot lighter than the Aurora. You are comparing apples to oranges. Replies to this message: lakerunner4h (Mar 14, 2007 2:35 pm)
#18 of 19 FIVE OR SIX SPEED SWAP INTO '95 STS by cabocurt Mar 14, 2007 (2:06 pm)
DOES ANYONE KNOW IF I CAN PUT A LATE MODEL 5 SPEED AUTO OR POSSIBLY THE NEW 6 SPEED AUTO IN PLACE OF MY CURRENT 4T80E IN MY 95 SEVILLE STS??. THE FINAL DRIVE IS CURRENTLY 3:73. I KNOW I CAN CHANGE TO THE SLS'S 3:11 AND WOULD LIKE TO KEEP THE SAME INITIAL OFF LINE PERFORMANCE WHILE GETTING THE EASIER RPM AT CRUISE.
#19 of 19 Re: Gearing [dmathews3] by lakerunner4h Mar 14, 2007 (2:35 pm)
Replying to: dmathews3 (Mar 06, 2007 2:02 pm) My '96 Riveria weighed about 700 lbs. more than my '98 Intrigue. Fuel mileage is virtually equal. The Aurora did weigh about 400 lbs. more than the Intrigue, and the LeSabre weighed virtually the same as the Aurora - and delivered 10 - 15% better fuel mileage.

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