Coast Resorts Open Roads Forum: Towing: automatic transmission shifting procedure
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PUCampin

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Posted: 04/16/14 10:08pm Link  |  Quote  |  Print  |  Notify Moderator

Bryan, I am curious, do you know what gears the 6R75 locks up in? I know when I am going slow like through a parking lot, it FEELS like it is locked. It will "chuck" some with throttle tip in and out like when driving around my car in 1st. Same if I am driving in 1st or 2nd going up a hill and feather the throttle, tip in and out is not as smooth as I would think if the converter was unlocked. If in 2nd or 1st and I let off the throttle, the tach drops in a linear manner with the speedometer until I am almost stopped where it will pop up a little like the converter is unlocking.

Whatever it does, I really like how they drive. I just wish I had the full manual control like the later ones, I would love to lock out 6th but NOT 5th for towing on the flat.


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Mike LeClair

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Posted: 04/17/14 12:21am Link  |  Quote  |  Print  |  Notify Moderator

I am kinda curious about your 3,500RPM ceiling as well. I tow with a diesel now and will take my 5.9 right up to 3,400 RPM red line when it is necessary to do so. When I ran gas units for towing I had no qualms about running the gas pots right up to 4,200 to 4,500 RPM depending on the motor being worked. My square bore 400CID Ford wasn't even sweating until 4,000RPM and she still had much more pedal to the floor if I needed it.

I think you should try "being one with your machine" and let the transmission make the decisions for you. If you are going up a mountain just keep the gas pedal down, to the floor if necessary, let the engine work and let the tranny logistics do what they do best. I agree that your 5.3 should NOT be struggling with a paltry 5,000lb trailer unless your are seriously way over weight with cargo, kids, dogs and an SO.

Service your tranny regularly, clean fluids and filters, adjust the bands and so on as required by your service manual and you should be good to go. If you are working the motor hard at, say, 4,200 RPM for an extended period of time, keep an eye on your gauges and react to any over temp situations. If you don't have a tranny temp gauge then get one installed and keep an eye on it.

Cheers!

Mike


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carringb

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Posted: 04/17/14 07:58am Link  |  Quote  |  Print  |  Notify Moderator

PUCampin wrote:

Bryan, I am curious, do you know what gears the 6R75 locks up in? I know when I am going slow like through a parking lot, it FEELS like it is locked. It will "chuck" some with throttle tip in and out like when driving around my car in 1st. Same if I am driving in 1st or 2nd going up a hill and feather the throttle, tip in and out is not as smooth as I would think if the converter was unlocked. If in 2nd or 1st and I let off the throttle, the tach drops in a linear manner with the speedometer until I am almost stopped where it will pop up a little like the converter is unlocking.

Whatever it does, I really like how they drive. I just wish I had the full manual control like the later ones, I would love to lock out 6th but NOT 5th for towing on the flat.


I believe it does. I think all of the Ford with drive-by-wire lockup in all gears. The "pop" you notice during deceleration is probably the fuel injectors firing again. Normally during coasting your T/C is locked and the engine is completely de-fueled until it drops below a certain RPM.

If you get a 5-star Tuner, you can have a 6th-gear lockout enabled for towing. I know some guys like this feature for the 5R110 behind the V10, because it also does not have an overdrive lockout.


Bryan

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Tystevens

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Posted: 04/17/14 10:06am Link  |  Quote  |  Print  |  Notify Moderator

At 3500 rpm, you're just getting into the power band for that engine. If you look at a power output curve, you have to get to 4000-5000 rpm for max torque and hp numbers. We have put a lot of miles on our Chevy 5.3s above 4k rpms; you have to when towing with pretty much any small block V8. So I'd say let 'er rev -- you're not enjoying the full potential of that engine!

Re: downshifting, the transmission is programmed not to hurt anything when it downshifts. I would not worry about it.


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Tystevens

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Posted: 04/17/14 10:10am Link  |  Quote  |  Print  |  Notify Moderator

Teamfour wrote:

The way to fix that is to get a tow vehicle suitable for your towing needs. If the tranny is having to shift to first to get up a hill you are severely under powered.


Well, it depends on the hill, the road, etc. There are lots of routes here in Utah that put us in 1st gear, especially in our '05 w/ the 4 spd transmission, and I don't think we were severely underpowered. A 10% grade and 25 mph curves has low gears written all over it.

Timeking

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Posted: 06/25/14 12:00pm Link  |  Quote  |  Print  |  Notify Moderator

As far as my transmission needing checking, I've towed this TT for over 40,000 miles now, so I'd think if it was going to die, it would have long ago given up the ghost.

I am glad I posted because PUCampin seems to know his stuff and I think the "drop into 2nd when I hit 3200" seems logical. I'll have to see what 3200 in 3rd equates to MPH. As far as folks thinking you never need to go to 1st, I suggest you pull the grades from Hot Springs NC over to Walnut NC, and see if you can do that without overriding the computer and manually downshifting. That is 9% on both sides of those two hills. With the new info (3200 rpm) maybe I can make it over while still in 2nd. Will test that idea in the coming week.

I am over 8000 miles on this trip out west through TX, NM, CO, UT, WY and then driving like hell to dodge the NE and SD and MN hail and tornadoes. Hail busted out all my vents in Colorado Springs. Yay. Currently in Indiana, trying to get back home to Fort Pierce, FL.

Timeking

fort pierce

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Posted: 06/25/14 12:01pm Link  |  Quote  |  Print  |  Notify Moderator

PS: I drop the pan and change the tranny filter every 30K.

mbopp

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Posted: 06/25/14 03:27pm Link  |  Quote  |  Print  |  Notify Moderator

I would lock my Envoy in 2nd gear and let it wind to 4000RPM going up a hill. I'd lock it in 1st for steeper hills.
With the F150 I hit the Tow-Haul button and let the computer decide.


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Bipeflier

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Posted: 06/25/14 05:21pm Link  |  Quote  |  Print  |  Notify Moderator

Expect the tranny to go "byebye" at about 140-160k miles in these. Our family has had 3 of the 03's and serviced by the book. Almost like the old alternators of the late '80's, like clock work.


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Hybridhunter

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Posted: 06/26/14 05:36pm Link  |  Quote  |  Print  |  Notify Moderator

I suspect that the OP needs to push the accelerator to the floor, and just let it do it's think.
OP - You are likely better off in 2nd, revving higher, and maintaining some speed, than getting bogged down by trying to baby it. My dad used to do this when he was new to towing. It seemed like brutal abuse to the truck, now he just pushes the pedal to the floor, and the engine rev's like it was designed, and goes.

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