On Tue, 27 May 2014 15:44:45 -0400, H*a*r*r*o*l*d wrote:

On 5/27/2014 3:08 PM, Mr. Luddite wrote:
On 5/27/2014 2:56 PM, Poquito Loco wrote:
On Tue, 27 May 2014 14:45:09 -0400, "Mr. Luddite"
wrote:

On 5/27/2014 2:19 PM, wrote:
On Sunday, May 25, 2014 3:04:31 PM UTC-4, Mr. Luddite wrote:
On 5/25/2014 8:25 AM, Poquito Loco wrote:

On Sat, 24 May 2014 18:13:59 -0400, "Mr. Luddite"
wrote:



On 5/24/2014 4:03 PM, Poquito Loco wrote:

I'm thinking of putting one of these on the Silverado. Anyone
had any experience with the concept of

increasing the oil supply to keep it cooler?



http://www.ebay.com/itm/PPE-Allison-Deep-Tranmission-Pan-Duramax-Allison-1000-2000-2400-Series-128051000/121345886743?_trksid=p2047675.c100011.m1850&_trkpa rms=aid%3D222008%26algo%3DSIC.MOTORS%26ao%3D1%26as c%3D22855%26meid%3D7132067336503725629%26pid%3D100 011%26prg%3D9833%26rk%3D1%26rkt%3D10%26sd%3D121335 643997








Followup to my last ...



I assume your Silverado has a transmission fluid temp gauge as
well as

an engine temp gauge. My Ford F-250 Super Duty does, I know. If
I were

noticing higher than normal transmission temps while towing I'd
be more

inclined to add an axillary transmission fluid cooler rather than
just

increase the capacity of the transmission pan.



If I am not mistaken your truck has the Allison transmission.
From what

I've heard, it is a superb transmission for towing ... probably
the best

thing GM has going for it in their trucks. Unless it's getting
hotter

than normal, I'd leave it alone. Just my humble opinion.





Here's an interesting and informative piece about Allison
transmissions. I'll probably just leave

mine alone for a while. I've never seen the temp get much over 200.



http://dmaxstore.com/index.php?main_page=product_info&cPath=16_363&prod ucts_id=668&zenid=2euu9fpbqf4tmumt6ecj7kbu74








The Pace Arrow Class A motorhome we had for a while had an Allison

transmission. It was the only thing I liked about the whole rig.



Ford sorta copied some of the operating characteristics of the Allison

in the "TorqueShift" transmission used in the Super Duty Series. It

operates similarly to the Allison, including different gear ratios on

the downshifts than the upshifts.



One thing common to both that I assume you do ... always use the

"Tow/Haul" mode when towing. Otherwise, it *may* get hotter than
normal.

I'm having a little trouble with "different gear ratios" going down
verses going up. There's only one collection of planetary gear sets
in an automatic. The ratios don't change.



I think I screwed that up. It's not different gear ratios, but rather
different shift pressures (when using the tow/haul mode). For example,
like the Allison, the Ford Torqshift will sense when going downhill and
automatically downshift to apply engine braking on gas engines, saving
wear on the brakes. Doesn't apply to diesels, since a diesel has no
engine braking.


If I set the cruise control to 45 mph (for example) and am in tow/haul
mode, the transmission will
downshift using the engine to keep the speed there. If the cruise
control is not set, but I'm in
tow/haul mode, the transmission will sense my slowing down, with or
without the brake, and downshift
- if, for example, I'm approaching a red light.



The Ford Torqshift does the same in Tow/Haul. Only difference is that
with your rig being a diesel you don't get any engine braking when
going down hills like you will with a gas engine.

Modern diesel engines do have engine brakes.

http://www.ehow.com/about_6303585_di...ake-work_.html

It sure feels like I'm getting engine braking when approaching a stop sign in tow/haul mode. If the
T/H button is not pressed, there is no braking - just like a regular automatic transmission.