First diesel, normal operation? - PowerStrokeNation : Ford Powerstroke Diesel Forum
 
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post #1 of 7 (permalink) Old 11-03-2009, 02:26 AM Thread Starter
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First diesel, normal operation?

Just got my first diesel today, a 2000 F350 with the 7.3.

Anyway, it's quite different from automatic cars as far as shifting and running. Let me know if this is normal.

1. When doing heavy acceleration the tranny will shift into the next gear very smoothly and with little to no jerking. Very similiar to riding a clutch under heavy acceleration as you go into the next gear I'm assuming this is normal "slushiness" that everyone describes and why most install the BTS valve bodies and what not? I don't drive this truck like it's stolen, just got on it that one time to make sure all was well. I've got the Mustang to drag race :)

2. While driving through the mountains on the way home with O/D off at about 50-55 MPH whenever I let off the gas the RPM's would drop to idle. Then I would pick up the gas and it would start engaging the tranny at about 1200-1500 RPM. When I turned O/D back on it would hold the RPM at about 2,000. I thought at first maybe it was wired in reverse but when I got out on the interstate and hit it to turn it off there was a definite downshift out of O/D.


Tranny fluid is not burnt, in fact it's so clear I can't see it on the dipstick without holding it about an inch from my eye.

'00 F350
Mods: Autometer gauges, Tru-Cool #4739 trans cooler, BFxenon HID lights, and backup fog lights
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post #2 of 7 (permalink) Old 11-04-2009, 12:03 AM
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Re: First diesel, normal operation?

1. The shifts in a 4R100 are too smooth for some people. They tend to get smoother as the fluid ages. New trans fluid can help, so can aftermarket valve bodies.

2. Your coast clutch is not applying when it should. What happens at 40 MPH if you move the shifter to 2? Does it have engine braking, or does it drop to idle speed?
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post #3 of 7 (permalink) Old 11-05-2009, 02:17 AM Thread Starter
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Re: First diesel, normal operation?

1. Does it hurt the tranny any? I'm assuming it'll wear out faster.

2. I was playing around today. Whenever I have O/D on it'll hold the RPM until I hit the brakes then it'll drop to idle. When I take my foot off the brakes I feel it kick almost like a downshift and the RPM's come back up. It didn't appear to do that with O/D off, it just went to idle.

I'll have to check for the 40 MPH and drop to 2nd. So what's it mean about the coast clutch, do I need to do the torque converter lockup switch I keep seeing?

Now I just have to figure out why my hubs don't autolock, have to manually lock them in. Thanks.

'00 F350
Mods: Autometer gauges, Tru-Cool #4739 trans cooler, BFxenon HID lights, and backup fog lights
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post #4 of 7 (permalink) Old 11-05-2009, 02:46 AM
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Re: First diesel, normal operation?

Quote:
Originally Posted by merc123 View Post
1. Does it hurt the tranny any? I'm assuming it'll wear out faster.

2. I was playing around today. Whenever I have O/D on it'll hold the RPM until I hit the brakes then it'll drop to idle. When I take my foot off the brakes I feel it kick almost like a downshift and the RPM's come back up. It didn't appear to do that with O/D off, it just went to idle.

I'll have to check for the 40 MPH and drop to 2nd. So what's it mean about the coast clutch, do I need to do the torque converter lockup switch I keep seeing?

Now I just have to figure out why my hubs don't autolock, have to manually lock them in. Thanks.
I can answer #2 for you...

That's normal operation. When you apply the brakes, the TC unlocks. When you touch the gas, the TC will lock back. That's the "downshift" you're feeling.

And the hubs operate off of the vacuum system. Check your lines from the knuckle to the vacuum actuator.
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post #5 of 7 (permalink) Old 11-06-2009, 07:52 PM Thread Starter
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Re: First diesel, normal operation?

I figured out the 4WD. I wasn't driving it to lock the hubs. I did it from a stop like back in the day.

It engine brakes with the manual downshift to 2. Thanks guys.

'00 F350
Mods: Autometer gauges, Tru-Cool #4739 trans cooler, BFxenon HID lights, and backup fog lights
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post #6 of 7 (permalink) Old 11-07-2009, 04:40 AM
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Re: First diesel, normal operation?

Put a John Wood valve body in it, you'll love it. While in a tow tune the conv stays locked with brakes on until about 25 mph and downshifts along the way down. It also locks in 3rd.

Glen
early99 f350 cc, lb, 2wd, drw, A pillar autometer guages, CTS monitor, AIS intake, 4" turbo back cat delete diamondeye exhaust, dptuner, pmt1, jw vb, Swamps ab inj, Adrenaline oil, Coolingmist, 180*T, Trucool cooler, spin on trans filter, Firestone air bags, 2" frt leveling kit, now chased by a 34' toyhauler
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post #7 of 7 (permalink) Old 11-07-2009, 01:12 PM Thread Starter
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Re: First diesel, normal operation?

No tuner here :)

'00 F350
Mods: Autometer gauges, Tru-Cool #4739 trans cooler, BFxenon HID lights, and backup fog lights
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