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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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#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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