I have a 2000 Excursion v 10 Gas, Automatic with 25 k miles, (yes only 25k) its kept garaged and stored in the winter, its used in the summer for towing my 31' trailer. 16,500 to 17,000 total.
Cold air intake, exhaust, hyper tech programmer, premium fuel, sometimes with octane boost. 4" lift with air bags in back.
It has 4.30 gears and 35" tires. I lost the Transmission at 22,00 miles, reverse went out.
I had the transmission seriously built. One of the many transmission up grades is a triple disc, billet aluminum torque converter. It now locks up in second, third and forth gears.
While that is good, it locks up in second where the stock never did and this lowers my towing RPM enough to drop me under my peak torque curve. I live in Oregon and go over MT Hood and it is steep, as well as a lot of other towing climbs.
While it still does very well, I lost a little with the converter lock up. I want more RPM for the climbs. It now has 4.30 gears with 35" tires. I am going to put 488 or 513 gears in it. Lets not talk mileage because their isn't any with these truck no matter the gear. I am just talking maximum towing power.
Both would work well, the 513 would be the best for help in 3rd and fourth gear. I am not worried about highway RPM because of overdrive in forth and I dont usually go over 70 towing.
My question has anyone done 513 with 35's here??
My concern is whether or not second gear will be to low, I need to be in second gear revving on the steep climbs. I used to be able to run it up to 4,400 RPM in second, now only 4,000 with the converter locked up. 4,400 was about 63 MPH, now at 4,000 only about 55 0r 56 MPH.
So I want it to be lower, but not to low in second, however third gear in the smaller hills could definitely use the 513 gears. I need all the RPM in 3rd I can get, without making second to low for the steep climbs. If I get second to low, I will have plenty of power, but run out of RPM.
Thanks for any relevant experience guys.

 

long story short: to get from 4000 to 4400 you would only need to drop to a 4:40 ratio of which there isnt one available. I wouldnt go below a 4:88

Peak HP is @4250rpms so shoot for that! also keep in mind peak trq is only @2650rpms.

 

If I remember right the sweet spot in gearing for the V10 is the 4:30's.

 

4.56
or
4.88

I wouldn't go with any deeper gears. Those 2 will put you back at nearly the same factory drivetrain ratio your X had before you put the 35" tires on her. Coupled with your built tranny, should be a good combo

4.88 would probably be best though

 

Hi and thanks for the input, I pulled up a gear chart yesterday, as my big concern was second gear at 55 to 60 mph.
Actually the V-10 max torque is at 3,250 RPM, I looked that up yesterday too.
First gear is 2.71 second is 1.54 third 1.1 and 4th .71 overdrive.

With the 4.30 I have now and 35's which are actually 34.60 OD
5000 RPM for example would be at 67 MPH
488's at 59 MPH and 513's would be at 56 mph. those are the numbers I was looking for.
3rd gear at 3,000 RPM is 56 MPH for the 430
50 MPH for the 488
and 47MPH for the 513's, 3,000 is 250 RPM below the max torque.
Always looking for more performance. lol

 

Thats what I have now, and they are good with 31" tires but with 35" tires I could use more RPM.
Check out my RPM info at speeds on the above post

 

Thanks, yes that might be about right, check out the gear chart info I replied on another post here ,Thurman I think it was.
I found all the speeds at RPM for the different ratios in all gears with my focus on 2nd and 3rd.

The built tranny is great but that extra lock up in second gear lowered my RPMs. So picking that up would help, but I dont want to run out of RPM by going to low either.
I found the tranny gear ratios and found a chart I could plug it all into and it gave me all the RPM at speed data I needed.

Thanks

 

I made up a chart for ya to help with the dilemma.

I had originally made a excell worksheet for this when I was figuring out the gearing on mine. This is a PDF of the info for 35 inch tires:

RPM and gear chart excursion 35 inch tires.pdf - PDF Archive

Click on the red "DOWNLOAD FILE" button on the middle of the page.

 

Thanks for the chart, I appreciate it, but it differs significantly from the chart I found yesterday and plugged all the data into.
See the chart here, it is for the 4.30 gears with 35' which are actually 34.60. OD. that could be part of the discrepancy.
My speedometer is calibrated for the tire size, and my RPM is higher than your chart shows. For example your chart shows 4,134 RPM in second at 65 mph, I am actually turning 4400 at 63 MPH. This chart shows 5,000 RPM at 67 MPH in second, Your chart shows 4,452 RPM at 70 MPH in second. I have come out of warm springs hill at 4,400 RPM before in second with my trailer on, and I know I was not going 70MPH, Oh how I wish I could. lol

Sorry, for some reason the chart below would not go through, with the calculated numbers.




Step 1: Select transmission from the drop down list or, if it's not in the list and you know the gear ratios of your transmission, enter them below.



Number of forward gears
1st Gear
2nd Gear
3rd Gear
4th Gear
5th Gear
6th Gear
Reverse
Manual or Auto with lockup torque converter
Automatic without lockup toque converter

Step 2: Select transfer case from the drop down list or, if it's not in the list and you know the gear ratios of your transfer case, enter them below.



High Range
Low Range
STaK 3rd Range

Step 3: Select underdrive.



High Range
Low Range

Step 4: Select axle gear ratio.

Ratio

Step 5: Select tire size.

Inch
Metric /R



The following chart lists the final drive ratio of all combined gears (transmission, transfer case, underdrive, axle) in all possible combinations

Final Drive Ratio
Gear Underdrive High Range Underdrive Low Range
Transfer Case High Range Transfer Case Low Range Transfer Case STaK Range Transfer Case High Range Transfer Case Low Range Transfer Case STaK Range
1
2
3
4
5
6
R
The following chart lists the crawl speed you will be going while the engine is at a given RPM. Crawl speed is calculated based on the lowest low range (transfer case and underdrive in low range) available in your rig.

Crawl Speed at Given RPM in Feet Per Minute
Gear RPM RPM RPM
1
2
3
4
5
6
R


The following chart lists the road speed you will be going while the engine is at a given RPM. Road speed is calculated based on the transfer case and underdrive being in high range.

Road Speed at Given RPM in Miles Per Hour
Gear RPM RPM RPM
1
2
3
4
5
6
R

 

The 2000 model V10 is: Power: SAE and 231 kW , 310 HP @ 4,250 rpm; 425 ft lb , 576 Nm @ 2,650 rpm

2001 and up are 3,250

 

I plugged in the 34.6 tire size with 4.30 gears and got 4182 RPM.

At 63 mph, my chart shows a RPM of 4053.

One thing to realize, is that there can and usually is quite a bit of torque converter slip, getting worse as the load gets heavier and heavier. The slip in some conditions may be as much as 30% (extreme). The only place it would be near the correct RPM in the real world is when the converter is locked up in overdrive. That would be why you see higher RPM's than my charts will show. The amount of slip is somewhat dynamic depending on load and temperature.

The chart I made are based strictly on gear ratios and not on torque converter efficiencies.

 

I am not sure where your coming up with the 2,650 RPM but that is not correct, see below. Beside the spec. facts, I can tell my V-10 from 11 years of towing a 31' trailer house is not making much torque until 3,250 and up.

Ford Excursion V10 4X4 Limited (2000)

SEE ALSO: Ford Buyer's Guide

By Tom Hagin

SPECIFICATIONS

Manufacturer's Suggested Retail Price $ 40,205
Price As Tested $ 41,245
Engine Type SOHC 20-valve 6.8 Liter V10 w/SMFI*
Engine Size 412 cid/6761 cc
Horsepower 300 @ 4250 RPM
Torque (lb-ft) 430 @ 3250 RPM
Wheelbase/Width/Length 137.1"/80.0"/226.7"
Transmission Four-speed automatic
Curb Weight 7,232 pounds
Fuel Capacity 44.0 gallons
Tires (F/R) LT265/75R16D all-season
Brakes (F/R) Disc (ABS)/disc (ABS)
Drive Train Front-engine/four-wheel-drive
Vehicle Type Eight-passenger/five-door
Domestic Content N/A

 

Thanks I appreciate your time and help, I understand what you mean about the converter RPM difference as well. I wish the all the figures would have come through on the other chart, just for comparison.
It showed higher RPM.

Take care

 

Now with the built tranny. and the triple disc billet converter it locks up in second gear, no slip, so I dont have enough torque to pull 4,400 RPM anymore.
Hence the gear change.
If I can keep it above 4,000 it wont lose any speed on the steep hills, below 4,000 it will lose speed on the steepest parts..
It would take 488 gear over the 430 gear to get the 400 RPM back.
The 513 would do a little better ,but then I am afraid I might run out of RPM, I dont want to run it up hills at 5,000 RPM.

 

[QUOTE=ImaThorp;11226005]The 2000 model V10 is: Power: SAE and 231 kW , 310 HP @ 4,250 rpm; 425 ft lb , 576 Nm @ 2,650 rpm


Below is stated for 2000 specs. The 2000 and 2001 are the same engine with the same HP and TQ. There is obviously NO way the same engine making the same HP and TQ could even remotely make the TQ at 600 RPM difference.


im
6,751 cc 6.8 liters 10 V engine with 90.2 mm bore, 105.7 mm stroke, 9 compression ratio, overhead cam and two valves per cylinder
Unleaded fuel
Multi-point injection fuel system
Main 167 liter unleaded fuel tank
Power: SAE and 231 kW , 310 HP @ 4,250 rpm; 425 ft lb , 576 Nm @ 3,250 rpm
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