Gas vs PSD
Fleet Mechanic
Joined: Feb 2007
Posts: 1,852
Likes: 39
Yes, if you did that all the time, an auto would suffer. But the post was clearly about using the auto transmission's ability to spool up the RPM into the powerband without burning up clutch material to do it.
Posting Guru
Joined: Apr 2008
Posts: 2,424
Likes: 2
From: Albemarle, NC
What I said. When a clutch slips it wears the friction materials within the clutch. Like rubbing two sticks together, there is wear there.
There is no friction clutch in a torque converter. It's a fluid coupling. Also, the TorqShift transmission is used in everything up to the F-550, and is used in combined weights up to 33,000 lbs. WITH the automatic transmission.
With the manual, the max capacity of a Super Duty is "only" 28,000 lbs.
There is no friction clutch in a torque converter. It's a fluid coupling. Also, the TorqShift transmission is used in everything up to the F-550, and is used in combined weights up to 33,000 lbs. WITH the automatic transmission.
With the manual, the max capacity of a Super Duty is "only" 28,000 lbs.
Sure there are friction clutches in a tq convertor, the viscous clutches. They can and will wear just like a clutch disk will.
"Mifflin Clay"
Joined: Jul 2005
Posts: 3,177
Likes: 4
From: Mifflin, PA
Actually the automatic transmission does suffer just as much as the manual. Loading the torque converter with that kind of load really generates the heat, and other internal parts generate more heat also. All this excess heat causes premature failure of the transmission. You can get away with it for a while, but it will eventually catch up with you, and bang,,,there goes a tranny. 
Super Moderator
Joined: Aug 2003
Posts: 25,479
Likes: 742
From: Isanti, MN
So, automatics don't have internal clutch packs, eh?
That difference is probably because in order to boost the towing capacity up on the manual any further means a much higher friction compound. Meaning that you won't be able to ride out the clutch as easy without it grabbing harshly. Probably too much driveablity will be sacrificied. It's not that it can't be done.
I think.
Senior User
Joined: May 2004
Posts: 407
Likes: 0
From: Humble, Texas
Sigh... Here we go again. Torque AT THE REAR WHEELS is what pulls objects up hills. Assuming you have the right gearing (most trucks do), higher-horsepower motors will be able to produce higher rear-wheel torque, and do it at a higher rate of speed. Engine torque comparisons are just about meaningless at this point. Engine torque is literally only half of the equation.
In only a few more pages, a Ranger will be out pulling a F450 with a 6.4.
Posting Guru
Joined: Dec 2006
Posts: 2,498
Likes: 3
From: Windsor, Colorado
They will unless you modify the clutch and pressure plate on the 6spd. The 6spds get really hot pulling heavy loads. If I had a 6spd and was using it to pull heavy I would have a trans temp gauge. When I had my hot shot setup I had a lot of pressure plate issues. They were all due to too much tranny heat.
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Laughing Gas
Joined: Mar 2009
Posts: 843
Likes: 6
From: Jessup, PA
I think it also has to do with transmission durability. Most medium duty manual transmissions are non synchronized. I believe this is because a transmission that can withstand that kind of load is going to have a very heavy rotating mass, which would be very hard on synchros. Going to a heavier, more durable, non-synchronized transmission would mean that almost nobody except a professional truck driver would know how to drive it
I think.
I think.
100% correct.
Super Moderator
Joined: Aug 2003
Posts: 25,479
Likes: 742
From: Isanti, MN
Thread Starter
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Modular motor junkie
Joined: May 2009
Posts: 6,190
Likes: 8
From: Texas
Thanks! Comes with lots of practice!
It's not that they don't have clutch packs. It's that you don't slip them to get the load moving
I think it also has to do with transmission durability. Most medium duty manual transmissions are non synchronized. I believe this is because a transmission that can withstand that kind of load is going to have a very heavy rotating mass, which would be very hard on synchros. Going to a heavier, more durable, non-synchronized transmission would mean that almost nobody except a professional truck driver would know how to drive it
I think.
It's not that they don't have clutch packs. It's that you don't slip them to get the load moving
I think it also has to do with transmission durability. Most medium duty manual transmissions are non synchronized. I believe this is because a transmission that can withstand that kind of load is going to have a very heavy rotating mass, which would be very hard on synchros. Going to a heavier, more durable, non-synchronized transmission would mean that almost nobody except a professional truck driver would know how to drive it
I think.
A clutch is easy to change and will last 100k with abusive driving.
Thread Starter
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Modular motor junkie
Joined: May 2009
Posts: 6,190
Likes: 8
From: Texas
btw, I do not have a 6 speed, I just wish I did.
Posting Guru
Joined: Dec 2006
Posts: 2,498
Likes: 3
From: Windsor, Colorado
It would be great if they would offer a heavy duty manual tranny as an option. The auto is what, 1k dollar option. I would rather pay 1k extra for a manual tranny that was pretty much bullet proof.
Senior User
Joined: Dec 2007
Posts: 287
Likes: 0
From: Calgary Alberta Canada
Thanks! Comes with lots of practice!
It's not that they don't have clutch packs. It's that you don't slip them to get the load moving
I think it also has to do with transmission durability. Most medium duty manual transmissions are non synchronized. I believe this is because a transmission that can withstand that kind of load is going to have a very heavy rotating mass, which would be very hard on synchros. Going to a heavier, more durable, non-synchronized transmission would mean that almost nobody except a professional truck driver would know how to drive it
I think.
It's not that they don't have clutch packs. It's that you don't slip them to get the load moving
I think it also has to do with transmission durability. Most medium duty manual transmissions are non synchronized. I believe this is because a transmission that can withstand that kind of load is going to have a very heavy rotating mass, which would be very hard on synchros. Going to a heavier, more durable, non-synchronized transmission would mean that almost nobody except a professional truck driver would know how to drive it
I think.
I'd be fine with that.
Thread Starter
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Modular motor junkie
Joined: May 2009
Posts: 6,190
Likes: 8
From: Texas
It will last 100k miles as long as you arent pulling 20-30k down the interstate regularly. Then you get to change it every 15-20k miles. BTW, when the clutch goes out in the 6spd it is a crap shoot, sometimes it takes the intake shaft out and becomes a $2500 fix.
It would be great if they would offer a heavy duty manual tranny as an option. The auto is what, 1k dollar option. I would rather pay 1k extra for a manual tranny that was pretty much bullet proof.
It would be great if they would offer a heavy duty manual tranny as an option. The auto is what, 1k dollar option. I would rather pay 1k extra for a manual tranny that was pretty much bullet proof.