6-speed manual vs. auto transmission - Diesel Forum - TheDieselStop.com
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99 & up 7.3L Power Stroke Engine and Drivetrain Discussion of the 99 & up 7.3L Power Stroke diesel engine and drivetrain in the 1999-Up Super Duty trucks and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.

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Old 09-27-2006, 11:40 AM   #1 (permalink)
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6-speed manual vs. auto transmission

Hello Board:

I just purchased a 2000 F250 PSD with the 6-speed manual transmission. I've done some snooping around but couldn't find any direct comparisons between the two. Seems like most trucks around here are automatics.

I've found that they 6-speeds have ~25 more horsepower/torque but that's about it. With my experience from previous manual vehicles I was just assuming it's slightly more reliable (less parts), lighter weight (less parts again), and gets slightly better fuel mileage.

Am I correct in my assumptions?

Thanks!
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Old 09-27-2006, 11:47 AM   #2 (permalink)
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Re: 6-speed manual vs. auto transmission

As far as more durable, no doubt. Fuel mileage depends on how you drive it.
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Old 09-27-2006, 11:51 AM   #3 (permalink)
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Re: 6-speed manual vs. auto transmission

[ QUOTE ]
With my experience from previous manual vehicles I was just assuming it's

slightly more reliable (less parts) <font color="red"> Possibly, but they do fail. Pilot bearing has reportedly taken out the input shaft gears, and mine died when the OTW cooler failed an mixed coolant with the ATF. But I've heard of a lot more stock auto tranny's failing. </font>

lighter weight (less parts again) <font color="red"> Not necessarily. The ZF-6 is a BEAST, you sure won't be able to bench press it. </font>

and gets slightly better fuel mileage. <font color="red"> Maybe. I think that depends more on your driving style. It would be interesting to see a side-by-side comparison of otherwise identical trucks. </font>

[/ QUOTE ]

I just like to DIY when it comes to shifting. You are right that there are LOTS more auto than "standard" trannys. More people either don't want to drive a stick, (or can't [img]/ubbthreads/images/graemlins/shrug.gif[/img]), and so auto's are what the manufacturer's build. I had to look pretty hard to find mine.

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Old 09-27-2006, 04:49 PM   #4 (permalink)
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Re: 6-speed manual vs. auto transmission

yup.
4 main complaints with 6 speeds.
the clutch puck will randomly toss its springs, meaning you can't get cltuch to disengage. When it goes, switch to southbend or Luk.
pilot bearings get chowed. when you replace the clutch, put a plastic pilot bushing in.

clutch pedal is hard to hold in. luk and southbend fix this.

clutch is a PITA in traffic. Nice on the road, great towing, but suck around town.
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Old 09-28-2006, 10:43 AM   #5 (permalink)
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Re: 6-speed manual vs. auto transmission

I thought about getting a hand shaker when shopping for a PSD.

I wound up with an auto. The only auto I own.

I love having just 2 pedals! [img]/ubbthreads/images/graemlins/biggrin.gif[/img]
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Old 09-28-2006, 06:49 PM   #6 (permalink)
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Re: 6-speed manual vs. auto transmission

If MPG is important, the 6 speed rules. All else being equal, the 6 speed will get an additional 2 MPG over the automatic.
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