Hello all. I have learned a LOT from just reading all the posts on here! You folks are amazing! Please forgive me as I am new to posting in any format.

OK here is what I have:
Ford F600 Box Truck

My question is this:

With the 330 HD engine, 4 speed transmission and the 6.20 rear end is there any easy way to get this truck to go over 45 mph LOL? What recommendations would anyone have on this?

Changing out the rear differential? Changing out the ring and pinions? Different tranny?

I am using this for garage saling and auctions and moving various family m,embers households. There is still a lot to be done to this truck but it runs great, box needs only a little repair and the fold under liftgate still needs to be un-rust welded. I do not believe the box is original but serves my needs.

Yes it still has the Holley carb and will be replaced as soon as I can find an edelbrock.

Any help would be greatly appreciated.

I really am happy with the truck and just want to do over 45 LOL.

ok hope this works LOL

 

Welcome to FTE

All 500 and larger series trucks were only sold new as Cab & Chassis. Whatever "back of cab" equipment they have, were installed by aftermarket body makers.

These trucks were available with optional Eaton two speed rear axles. Find one a these and install it, you'll be able to do 55+

 

Are you sure it is a Holley carb and not a Motorcraft 2100?

 

As OEM it should be a governed Holley. I think.

 

Yes its the Holley. And I will start looking for that two speed rear ASAP.
Thanks one and all.

 

Check the ratios before you buy. Some are taller in high range, some are not vs. what you have already.

 

Looking to see whats compatible first then the ratio. I know it has to be electric.

Brooks

 

While I am looking for a two speed can anyone tell me what other gear ratios are available for that rear end? What do you recommend for ratio and what (roughly should it cost for parts? (Son in law is a mechanic LOL) Lastly who might have them actually in stock?

 

Hi Anvil629,

In my '73 Ford Truck manual, there are at least 5 different 2-speed rear axle capacities listed, with 3, 4, or 5 different 2-speed ratio combinations for each one. Looking at just the high side of the high/low ratios, some are higher than your 6.20 ratio, and some are lower. Get the wrong 2-speed rear end, and you'll be doing less than 45 mph, not more!

Can you post your VIN# and the rest of the information on the vehicle rating plate, especially the axle code? These number/letter combinations can be decoded and give a better idea of what you have, thereby allowing a better recommendation of what you need to look for in a rear axle. This plate should be riveted to the rear face of the driver's door.

The 330 V8 probably red lines at about 3800~4000 rpm's. My F600 can run fairly comfortable down the road at about 60 mph while turning about 3000 rpm. If your governed carburetor is restricting you to 45 mph by restricting your rpm's, it may be a lot cheaper, faster, and easier to do something with the carburetor as opposed to swapping out for a 2-speed rear end. Either adjust or disable the speed governor on your carburetor if possible, or find a Motocraft 2100 carburetor for your truck. A lot of Ford cars and trucks from the mid/late 50's through the early/mid 70's used a 2100 carb, so they shouldn't be too hard to come by.

Good luck on going faster, 45 mph is a drag when trying to get to the next garage sale, auction, or swapmeet!

 

http://i725.photobucket.com/albums/w...psrvzey5uz.jpg

 

Hi Anvil629,

Thanks for the link to your rating plate, now we can figure some stuff out.
VIN# F60DVT62453
F60 = F600
D = 330-2V H.D. V8.
V = assembled at Kentucky Truck Plant.
T62453 = Best I can interpolate, produced in February? 1974? (For some strange reason my 1973 Ford Truck Shop Manual doesn't seem to include 1974 production dates ).

Also..........
W.B. = 182 (wheelbase, in inches).
Color = ? (no code indicates the truck was delivered in gray prime).
Type/G.V.W. = F602 (F600, but my manual isn't clear on the 2).
Body = 4B8 (4B indicates black vinyl trim, 8 indicates cab/chassis only). Trans = A (New Process 435 4-speed).
Axle = 622 (Rear and front axle, see next paragraph).
Max. G.V.W. Lbs. = 19,200 (gross vehicle weight).
D.S.O. = 534307 (1st two digits, 53, is Kansas City District Sales Office).

Axle Code 622: The first 2 digits (62) are for the rear axle on your truck. Your rear axle is a Rockwell Model F-106, 15,000 Lb. capacity, 6.20 ratio.
The remaining third digit (2) is for your front axle, and indicates a 5,500 Lb. capacity front axle.

If you want to go faster for a given engine rpm, then you need a higher ratio (numerically lower) rear axle. The Rockwell Model F-106 rear axle was offered in 3 different ratios, and the main problem for you is that your axle is already the highest ratio. The other two ratios being 6.80 and 7.20.

There are some axles with higher ratios (lower numerically) that might be good candidates to look for. You'll probably have to find a donor truck somewhere. Also, you will want to stay close to the 15,000 Lb. axle capacity rating.

Here's a few other Rockwell single-speed axles that might work.........
Axle code 41 = Rockwell model D-100, 13,000 Lb. capacity, 5.83 ratio.
Axle code 52 = Rockwell model H-170, 17,500 Lb. capacity, 5.86 ratio.

Here's some Eaton 2-speed rear axles that also may work for you..........
Axle code E1 = Eaton model 16244, 17,500 Lb. cap., 5.57/7.75 hi/lo ratios.
Axle code F1 = Eaton model 15201, 15,000 Lb. cap., 5.14/7.17 hi/lo ratios.
Axle code F2 = Eaton model 15201, 15,000 Lb. cap., 5.83/8.12 hi/lo ratios.
Axle code EH = Eaton model 17221, 18,500 Lb. cap., 5.57/7.60 hi/lo ratios.

I have no idea what any of this might cost you. And something tells me you won't be able to waltz into just any old truck dealer and order the parts you need (but never say never, stranger things have happened). You might be better off looking for a parts truck. As far as the rear axle goes, you won't have to confine your search to just the medium duty F-series of that era. The Ford C-series, B-series, and N-/LN-series medium duty trucks also used these axles. Don't forget, you will need a different speedometer drive gear if you change ratios.

Disclaimer: No guarantees the above information is 100% correct. I have only been in the medium-duty truck hobby for a few days now , and some errors are bound to happen on occasion. The alternate rear axle selections are based solely on the ratios only, and there are no guarantees that any of them would be a cheap, quick, easy, affordable, pain-free, bolt-in replacement for your current axle. Hope this is helpful. Then again, I always try to offer helpful advice. I will now sit here and patiently wait for Mr. Know-It-All to give me my usual reward anytime I try to be helpful.

 

F60 = F600 2WD

D = 330 2V Heavy Duty FT Engine.

V = Kentucky Truck Assembly Plant.

T62453 = 1974.

182" Wheelbase.

COLOR: Blank*

F602 = F600 2WD .. 19,200 lbs. GVWR

4B8: 4B = Black Heavy Duty Vinyl / 8 = 81A Conventional Standard Cab.*

A = New Process 435 4 Speed Manual Transmission.

622:

62 = Rockwell(Timken) model F-106 Single Speed Rear Axle / 6.20-1 / 15,000 lbs. Rear Axle Capacity.

2 = Ford 5,500 lbs. Capacity Front Axle without P/S.

19,200 lbs. Gross Vehicle Weight Rating.

534307:

53 = Kansas City MO Ford District Sales Office, where the original selling dealer ordered the truck from.

4307 = Domestic Special Order number. Truck ordered special by the original purchaser, not "bought off the lot."

*When there is no COLOR code stamped on the Warranty Plate, the truck was painted a non standard color per the original purchasers order. This makes it a Domestic Special Order.
Incorrect! See * above.

*If the BODY code was BA8: BA = Heavy Duty Black Vinyl / 8 = 81B Conventional Custom Cab. All 500 and larger series trucks were sold new as a Cab & Chassis (no "back of cab equipment").

 

Fired up my 74 F600 dumptruuck earlier this week.

I confirmed that it does indeed have a Motorcraft/Autolite 2100 2 barrel carb. The governor assembly appears to be incomplete and disconnected, so I assume this carb is a field retrofit by an enterprising mechanic.