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auto trans - Low speed driving in high gear #4483421
08/09/17 08:35 AM
08/09/17 08:35 AM
Joined: Jul 2017
Posts: 807
WA
OilUzer Online confused OP
OilUzer  Online Confused OP

Joined: Jul 2017
Posts: 807
WA
Hello everyone,

I am new here, this is a very informative site and a lot of knowledgeable people here. I found this site when I was researching 0W-20 Synthetic oil but I have another question. I am sure you all are tired of 0W-20 synthetic vs. dino questions! lol

I recently bought an auto 5.7L v8 after driving manual trans cars forever ... when I am going about 30 MPH and not accelerating for example in city driving, the car is in the 5TH gear and about 1000 RPM and then it shifts into 6th gear (highest) at about 40 mph. not sure if the torque converter is locked or not ... the rpm is so low that I can't tell!

I manually shift it back to 3rd gear when going 30 mph to get the rpm at least near or below 2000.
coming from manual trans background the 5th/30mph is kind of a foreign concept!

I am not concerned about fuel consumption otherwise I wouldn't have bought a v8! I wish the car had a 5 front gear manual trans!
not sure what is the best for the engine & transmission in a long run. let it do its thing or take over?

Thank you!

Re: auto trans - Low speed driving in high gear [Re: OilUzer] #4483425
08/09/17 08:38 AM
08/09/17 08:38 AM
Joined: May 2003
Posts: 7,466
Oklahoma
Schmoe Offline
Schmoe  Offline

Joined: May 2003
Posts: 7,466
Oklahoma
Seems to be the "in" thing now. Our new F150's here do that I've noticed. I wouldn't worry about it and let it do its thing.


01 Supercrew Lariat 4X4
06 Accord EX-L V6
14 CRV EX-L (RIP) 2018 CRV EX-L
Re: auto trans - Low speed driving in high gear [Re: OilUzer] #4483447
08/09/17 09:00 AM
08/09/17 09:00 AM
Joined: Feb 2007
Posts: 3,774
Southeast
meep Offline
meep  Offline

Joined: Feb 2007
Posts: 3,774
Southeast
Let it spin on down low. It'll rev and shift if you need it to. I personally enjoy having a large engine that just loafs along at low revs.


2018 F150
2015 crv (wifey!)
Re: auto trans - Low speed driving in high gear [Re: OilUzer] #4483450
08/09/17 09:01 AM
08/09/17 09:01 AM
Joined: May 2012
Posts: 2,585
Indiana
Phishin Offline
Phishin  Offline

Joined: May 2012
Posts: 2,585
Indiana
One of the worst vehicles I've ever driven that does this is my 1990 K1500 Chevy truck.

That truck shifts to OD at 35MPH!!!! So when I drive around town, I always keep the transmission out of OD. Otherwise, it wants to lug all the time.

I guess this is why installing a "shift kit" was so popular in the 80's and early 90's.


2018 Chevy Silverado 3500HD 6.0L Gas: RLI 10w30
2010 Accord-LX K24: MaxLife 5w30 + Torco MPZ
2014 CR-V LX K24: M1 0w30
Re: auto trans - Low speed driving in high gear [Re: Phishin] #4483459
08/09/17 09:08 AM
08/09/17 09:08 AM
Joined: Feb 2003
Posts: 3,762
Houston, Tex
TooManyWheels Offline
TooManyWheels  Offline

Joined: Feb 2003
Posts: 3,762
Houston, Tex
I'm on the forum for the new Colorado/Canyons and this drives many people crazy, to the point of buying aftermarket reprogramming (tunes).

Re: auto trans - Low speed driving in high gear [Re: OilUzer] #4483511
08/09/17 09:57 AM
08/09/17 09:57 AM
Joined: Dec 2011
Posts: 1,309
Ca
totegoat Offline
totegoat  Offline

Joined: Dec 2011
Posts: 1,309
Ca
I manually shift my autos all the time. Just adds to the fun of driving for me, plus around town, lower gears help my Cummins warm up and the exhaust brake is more effective.

Re: auto trans - Low speed driving in high gear [Re: OilUzer] #4483533
08/09/17 10:13 AM
08/09/17 10:13 AM
Joined: Dec 2006
Posts: 8,366
Canuck living in California
KrisZ Offline
KrisZ  Offline

Joined: Dec 2006
Posts: 8,366
Canuck living in California
I would let it do its thing on a daily basis, it will not hurt neither the engine nor transmission, despite what others might feel about it.
You have to remember that a fluid coupling allows slippage, unlike a friction type coupling, so you really cannot lug the engine.


2015 Grand Caravan 3.6L - 31k miles.
2006 Mazda 3 2.0L - 171k miles
Re: auto trans - Low speed driving in high gear [Re: OilUzer] #4483569
08/09/17 10:47 AM
08/09/17 10:47 AM
Joined: Jan 2011
Posts: 795
Anaheim, CA
zorobabel Offline
zorobabel  Offline

Joined: Jan 2011
Posts: 795
Anaheim, CA
My Maxima stays in OD with the TC locked a bit bellow 35 MPH at 1100 rpm, and even going uphill - up to a point. It obviously lugs the engine, and even thought I'm not sure how ping sounds like, it must be the noise and vibration this engine makes at 1100 rpm under load.


1997 Maxima 197k, Castrol GTX Synblend 5W-30, FL400S
2004 Corolla 197k, VWB + SSS + Rislone cocktail, MGL51516
Re: auto trans - Low speed driving in high gear [Re: OilUzer] #4483571
08/09/17 10:48 AM
08/09/17 10:48 AM
Joined: Feb 2014
Posts: 2,770
Canada
Lolvoguy Offline
Lolvoguy  Offline

Joined: Feb 2014
Posts: 2,770
Canada
On the Focus in my sig, I have started locking out the 4th gear around town.
From my understanding, lugging the engine and causing it to constantly shift b/t 3 and 4th gears causes harm to the engine and trans. Better to just lock it out until higher speeds are reached.


06 Lexus IS350- Wife
88 BMW 325is- Mistress
Say "no" to Turbo!
Re: auto trans - Low speed driving in high gear [Re: OilUzer] #4483626
08/09/17 11:50 AM
08/09/17 11:50 AM
Joined: Sep 2015
Posts: 4,111
Connecticut
69GTX Offline
69GTX  Offline

Joined: Sep 2015
Posts: 4,111
Connecticut
For 3-4 mile trips near home the car never sees over 40 mph and my shift point to OD is at 35-38 mph. These days I just leave it in 3rd for shorter distances. Once up to 45 mph OD is fine. Though to be honest, I have a tough time telling when the TC is locked or unlocked.

I can't see how a transmission hunting all the time from 3rd gear to OD and back (35-42 mph) can be anything but detrimental to it. And keeping it in 3rd for the first few miles (2000 rpm) will speed up the engine oil warmup to the desired 170-180 deg range.


----------------

2001 Lincoln Cont 4.6L DOHC/ 39K mi / QS HM 5w30 / FUG XG2
1999 Camaro SS M6 /19K /Mobil 1 0w40 /Fram UG /GM MTL-ATF
1969 Ply GTX/RRs
Re: auto trans - Low speed driving in high gear [Re: Phishin] #4483685
08/09/17 12:55 PM
08/09/17 12:55 PM
Joined: Jan 2016
Posts: 781
Nebraska
Duffyjr Offline
Duffyjr  Offline

Joined: Jan 2016
Posts: 781
Nebraska
Originally Posted By: Phishin
One of the worst vehicles I've ever driven that does this is my 1990 K1500 Chevy truck.

That truck shifts to OD at 35MPH!!!! So when I drive around town, I always keep the transmission out of OD. Otherwise, it wants to lug all the time.


My 89 GMC does the same thing, kind of glad to hear this since I had a rebuild put in 3k ago so I know it's normal.

Do you notice it shifts harder when in D vs OD?


89 GMC Sierra VWB 5w30/TG3980
08 Lucerne CX Magnatec 5w30/TG3387A
02 DeVille VWB 5w30/CQ Blue
18 Toro Super Recycler T5 10w30
Re: auto trans - Low speed driving in high gear [Re: OilUzer] #4483703
08/09/17 01:16 PM
08/09/17 01:16 PM
Joined: Sep 2002
Posts: 3,578
Arkansastan
Propflux01 Offline
Propflux01  Offline

Joined: Sep 2002
Posts: 3,578
Arkansastan
I actually like it on my Elantra. Less noise, and no reason to rev when just loafing along. What I dislike is the auto downshift when I let off the gas, especially down a grade. It drops to 5th automatically (hiway) whether it needs to or not. I know they do it for compression braking, but to me, harder on tranny, and brake pads are cheaper.


2014 Hyundai Elantra
2014 Hyundai Elantra GT

A 55 Gallon Drum And A Shovel Can Solve A lot of Life's Little "Problems"
Re: auto trans - Low speed driving in high gear [Re: OilUzer] #4483851
08/09/17 04:01 PM
08/09/17 04:01 PM
Joined: May 2013
Posts: 2,169
Saskatchewan, Canada
Johnny2Bad Offline
Johnny2Bad  Offline

Joined: May 2013
Posts: 2,169
Saskatchewan, Canada
With an auto transmission, put her in Drive and forget about it. If you tow or haul a heavy load, turn off the overdrive.

If the shifting bothers you, and it's available on your model (you don't say what year/make/model it is ... do so next time you ask for help here) try Sport mode.


'57 FL Straight 50 wt
'90 Miata 1.8L w/Rotrex Supercharger [Mobil1 0W-40]
'96 Ram 1500 [3.7L Mobil1 0W-20 / 1L 15W-50]
'01 PT Cruiser [Mobil1 0W-40]
Re: auto trans - Low speed driving in high gear [Re: Phishin] #4483860
08/09/17 04:09 PM
08/09/17 04:09 PM
Joined: Apr 2016
Posts: 814
Specific Ocean
Kibitoshin Offline
Kibitoshin  Offline

Joined: Apr 2016
Posts: 814
Specific Ocean
Originally Posted By: Phishin
One of the worst vehicles I've ever driven that does this is my 1990 K1500 Chevy truck.

That truck shifts to OD at 35MPH!!!! So when I drive around town, I always keep the transmission out of OD. Otherwise, it wants to lug all the time.

I guess this is why installing a "shift kit" was so popular in the 80's and early 90's.


I find my 02 Silverado to go into OD around 30mph then lock up at 35mph. If I keep on the gas while approaching a hill it won't unlock until it gets below 30mph. Lugging an automatic around 1,000RPM's is a sight to see.


Shin Gekiretsu Shin'ou'hou
01 Toyota Tundra 2WD V8 4.7L
02 Chevy Silverado C1500 V8 5.3L
Re: auto trans - Low speed driving in high gear [Re: OilUzer] #4483889
08/09/17 04:35 PM
08/09/17 04:35 PM
Joined: May 2006
Posts: 300
California
brave sir robin Offline
brave sir robin  Offline

Joined: May 2006
Posts: 300
California
This is from the owners manual of my old 6 spd 1997 SS Camaro.

bear in mind 6th gear on 4th gens was a .50 overdrive
70mph in 6th was around 1500rpm if memory serves and I think skip shift kept you around 1000-1100 rpm. That "feature" used to really let you know the transmission mounts were working thats for sure.



With dreams to be a king, first one should be a man
95 Nissan Pathfinder 5w-30 M1-HM
68 Buick Electra 10w-30 QS Defy
02 Aprilia Falco 15w-40 Rotella
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