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Discussion Starter #1
Hey guys! just bought a 94 f-250 from the original owner..114,000 miles,was his 5-th wheel pulling baby. has the 7.3 5 spd with 4;10 rear. any tips for fuel milage.....is getting 17.2 now.{i'm not compaining}. have posted on the heavy duty side but thought i"d drop in here and see what you guys think. any/all tips appreciated! thanks & take care!
 

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645 Posts
I have a '94 F350 Crew cab, 5 speed with 3.55 If I run 65-70 with no trailer I can get 22, pulling 16' stock trailer it get like 16ish

I put a 6 speed In my dad's '94 F350 CC, DRW, 4.11 he went from 16mpg empty to 18 mpg, next thing for that truck is 3.55

I would recommend a power hungry performance 6 position chip, after market down pipe and exhaust, 6637 air filter mod, 17 degree HPOP or an adrenaline pump, a ZG 6 speed, and 3.55 rear, 235/85R16 tires.

you can run 3.55 with your 5 speed (I hauled hay with mine) but it with be tough on your clutch, the ZF5 diesel tranny's 1st gear ratio is 4.14:1 (OD 0.76:1) and the ZF6 1st gear 5.79:1 (OD 0.72:1)

If you have 4 wheel drive the 3.55 and five speed are O.K. just put in in 4 low when you need to jokey your trailer around.
 

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Discussion Starter #3
thanks for the relpy hayjay. do you think a k&n system {OR ALIKE}would make any difference?don't really want to change gears & trans...it is a 4x4 & was thinkin about a O/Underdrive box someday. geared as is the things a stump puller.17+ isn'nt bad but looking for the most bang-for the- buck! Thanks!
 

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I would stay away from K&N or other "high flow" after market air filters, If you do oil samples (I do) you would see if you put a K&N like filter on your silica (sand) with go way up, they don't filter well.

The 6637 DIY cold air intake mod is really good, it has more flow them the over priced CAI (cold air intake) kits and filter really well. 6637 is a WIX part #, it is a big paper truck filter with a 4" I.D. rubber end. All you need to do is get, a hose 4" clamp, about 5" of 4" exhaust pipe and use it as sleeve between the air filter and air intake hose, you may have too loosen the intake hose at the other end and turn it too make it fit right. Also you will want to drill a hole in the 4" pipe for the filter restriction gauge.

If you search "DIY 6637 mod 7.3" you find all kinds pics and info.
I pay $25 for mine, it's is a Donaldson, I can't remember the part #.

Do you have a stock flattened out down pipe? If so Replace it with a 3" down pipe. You will have to cut the old down pipe in half with a sawzall or pull the tranny cross member to get it out, also you will have too hammer the firewall to floor pinch point out of the way were the new down pipe will go. I like to make 2 cuts (4" apart) in the pinch with the sawzall and use a long pry bar to hammer it over.

while your at gut the cat (or delete it) and delete the muffler, you could go with an after market exhaust, but with stock injectors it won't make much of a difference.
 

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Another thing you can do is run 8R19.5 tires, they are like 35" (some I had were 33.5") and come in 12 and 14 ply. The rims you want to look for are the one off of old Fedex and UPS single wheel delivery trucks, If the rims are off a GM axle lust bring them to a machine shop and have the cut the center out to the same size as your Ford rim.

There is also Rickson.com, they make custom fit 19.5 rims put they are like $265 each for the cheap ones

I run 8R19.5 on my F550 because it has 4.88 gears.

another though: I have a 3 speed Spicer (Brown and Lipe Gear Boy)aux transmission out of a 70's 10 wheel dump. It's 1st gear is 2:1, 2nd 1:1, and 3rd 0.79:1. I rebuilt it (simple) and I am going to put it in a '97 F350.
 
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