Downshifting

bastenblood

Original poster
Member
Dec 22, 2011
23
Very often , I pass from D , to 3rd gear , to 2nd just to slow down without using the brakes , and then return
to D . Is this a bad habit to have ?
 

McGMT

Member
Jun 17, 2012
621
bastenblood said:
Very often , I pass from D , to 3rd gear , to 2nd just to slow down without using the brakes , and then return
to D . Is this a bad habit to have ?

eh, not so much as long as your not revving the nuts off it. I use 3rd all the time to hold back on hills (I live in the mountains). I don't go down to 2nd at stops or nething just if I am going slower than 3rd will engage.

Incidently when you are going down hill and select a downshift after a few seconds if the engine is above around 1200 or 1300 RPM the PCM will cut out the fuel injectors giving you more holdback and infinite gas mileage (wooo) ...
 

BO TIE SS

Member
Nov 18, 2011
1,497
I go D, 3, 2 every once in a while because I like the sound of my engine winding down without the resonator. :yes:
 

RayVoy

Member
Nov 20, 2011
939
I have heard, AND I HAVE NOT VERIFIED, that using the trans in that manner can damage the sun gear.

I don't do it, so I never bothered to verify; but, if your concerned there should be info on the net.
 

McGMT

Member
Jun 17, 2012
621
RayVoy said:
I have heard, AND I HAVE NOT VERIFIED, that using the trans in that manner can damage the sun gear.

I don't do it, so I never bothered to verify; but, if your concerned there should be info on the net.

Most of the damage to a sun gear can be attributed to incorrect shimming... Or excessive shim wear... Or... abuse and old age. :thumbsup:

If rumors were yadda yadda, you know the rest.

Good you said that though so it can be discussed... :wootwoot:
 

AtlWrk

Member
Dec 6, 2011
674
bastenblood said:
Very often , I pass from D , to 3rd gear , to 2nd just to slow down without using the brakes , and then return
to D . Is this a bad habit to have ?

Cautionary tale: I've done the D-3rd downshift for as long as I've owned my TB (4+ yrs). In the last 6 months or so I added the D-3rd-2nd habit as well.

Long story short: A few weeks ago I had all three torque converter-to-driveplate bolts loosen and back out. Fortunatelyish one of the bolts backed out far enough to start striking the back of the engine casting (making a god awful racket) to alert me before it let go completely.

Turns out that the clunking noise that developed at startup and the harder-than-normal shifts were the loose TC bolts slamming back and forth against flywheel holes. I can't definitively prove that the downshifting was the root cause but I do know I'm looking at replacing a flywheel in the near future.

Moral: If you're going to do it, do so carefully and you should be fine. In particular, avoid aggressive torque reversals...if it feels abusive, it probably is.
 

Forum Statistics

Threads
23,392
Posts
638,779
Members
18,601
Latest member
Chris Moore

Members Online