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Unread 07-29-2012, 06:00 AM   #1
RobyD
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08 CRD driving habits

I love to downshift when going downhill or approaching the deceleration ramp off I 95. Not many hills here in South Florida. This is first model I've driven that has manual shift on automatic tranny.

My theory is to use engine braking in lieu of wearing down brakes. Anyone know if this driving style is good or bad for the motor?

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Unread 07-29-2012, 06:58 AM   #2
scootr29
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Quote:
Originally Posted by RobyD
I love to downshift when going downhill or approaching the deceleration ramp off I 95. Not many hills here in South Florida. This is first model I've driven that has manual shift on automatic tranny.

My theory is to use engine braking in lieu of wearing down brakes. Anyone know if this driving style is good or bad for the motor?
Manual shift is a joke....not worth the effort.

Also brake pads/rotors are a lot cheaper than a new engine/tranny.....
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Unread 07-29-2012, 07:12 AM   #3
suzieque
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Quote:
Originally Posted by RobyD View Post
I love to downshift when going downhill or approaching the deceleration ramp off I 95. Not many hills here in South Florida. This is first model I've driven that has manual shift on automatic tranny
I also downshift more lately, especially when towing. I also find that it helps cool the exhaust which in turn cools the turbo. When taking off I leave it in drive. I've read posts that manually shifting is better for the transmission then letting the transmission doing it for you. I will dig around and try to find those posts.
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2008 WK "S" Limited bright metallic silver exterior, light graystone interior, 5 speed W5J400 transmission, June 18/2008 build, C213RE rear differential with 3.73 axle ratio, C200FE front differential with 3.73 axle ratio, 245/60R18 Goodyear Fortera tires (stock summer tires), NV245 transfer case, GT2056V turbo, 3.0L CRD (OM642.980)
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Unread 07-29-2012, 07:25 AM   #4
RobyD
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Thanks SuzieQue

So Scooter, you think downshifting is bad for wear on the tranny? How about on the motor?
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Unread 07-29-2012, 07:52 AM   #5
jaje
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I do like the engine braking in my CRD due to it being a high compression motor (but with the hills where I live don't need to do any manual downshift). From experience with friends and family who have owned JGCs of various vintages the brakes on them were never great so you can overheat them quickly and warp rotors if you are not careful when towing (of course this is not counting the SRT8).
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Unread 07-29-2012, 09:05 AM   #6
scootr29
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Quote:
Originally Posted by RobyD View Post
Thanks SuzieQue

So Scooter, you think downshifting is bad for wear on the tranny? How about on the motor?
Yes I do...manual shift on automatics transmissions are a marketing gimmick. Your service brakes are capable of slowing down this vehicle without the assistance of the engine or tranny. Many of us are getting 60,000 miles plus on the OEM brakes/rotors.

Now if you are hauling 80,000lbs and the engine has a dedicated engine brake with a low, med and high setting than yes use the engine brake. Rotors/drums/pads on a Freightliner are pricey. You can do a brake job on the Grand for $350, maybe less if you turn the rotors.



Hopefully that makes sense.
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Unread 07-29-2012, 09:06 AM   #7
scootr29
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Quote:
Originally Posted by jaje View Post
I do like the engine braking in my CRD due to it being a high compression motor (but with the hills where I live don't need to do any manual downshift). From experience with friends and family who have owned JGCs of various vintages the brakes on them were never great so you can overheat them quickly and warp rotors if you are not careful when towing (of course this is not counting the SRT8).
The warping rotors is a WJ early WK issue...the brakes especially on the 2007+ WKs are bigger and better...lots of us getting 60,000 miles + out of the brakes and rotors.
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