Please help,

Can I fit and E4OD on 89 F 350 with C6 Trans.
it need another gera I am not sure that they would put in such a transmission on a diesel engine. The RPM is 2400 when goping 55 MPH that is too much for the Diesel and slow

 

The E4OD was an option in 89, and if you get one that was behind a diesel, it will bolt in. But, these trannies have problems that Ford never did get worked out until after 1995, so get a later tranny, or get an older one rebuilt with the later upgrade parts. Also, the big turn off to this tranny is the computer and sensors required to run it. You will have to get the whole wiring harness and computer off a diesel pickup, or possibly buy a aftermarket computer to run it.

 

Hey Franklin,

Thank you for the help

I dont mind getting a later model tranny
In fact I may have an opportunity to get one off a truck that a 95 or 96 with a 5.8 l that has been junked by the local city garage.
should be able to get the whole harness with it

If I may ask to provide me with spec or parts that I may need for this transformation.

I am taking on the rear suspension , just a got aset from a yard they look good they are 5 springs I will be adding 3 to make them 8 leaf on each side

Look forward to your input on the tranny

Thank you
asleiman

 

Tranny off a 5.8l wont work. The bellhousing is different. It has to be off a Diesel.
E4OD and 4R100E Performance Products Check this site out for a controller and harness

 

Here is the question about the C6 Trany in diesel set up

Why would FORD put a 3 speed Trans in Diesel operation with the engine running at 2400 RPM to reach a speed of 55 MPH? it does not make any sense?

Unless I am missing something on my gearing , by the way my rear end was changed to 3.55 it a 4.10 . someone wanted to be this low.

 

The diesels in the 80s were designed for a national speed limit of 55 MPH. 2400 RPM is not a bad speed for towing, so as long as you are going the speed limit (for that era) it was an acceptable combo.

First question is how much do you want to spend on this?

I have the build up E4OD tranny like what franklin suggests, but you are looking at around $3000 for everything. At least that was about my cost.

My 86 actually came with a C6 and 4.10 gears so I know what its like. It sucks. Depending on what you want to do with the truck and if its 2wd, you might consider swapping to 3.08 gears instead.

 

GOOD ADVICE!!!!!!!!!

Another possible reason for your truck having a C-6 is there are a lot of people like me who value low maintenence costs and durability over almost everything else.
Heck, I don't even like 3-speed autos, I'd rather have a manual.

 

I've got a C6 4.10 combo like you, and she'll scream 3K to run 70, but so she really doesn't mind being wrapped up that tight.

 

My E4OD will do seventy at 2500 with 4:10's.

 

That seems a little low. Just did some rough calculation and 2500 RPM should have you at about 78 MPH assuming stock 235/85/16 tires.

I'm at 1650 at 70 MPH.

 

Guys thank you for alkl your great responses

David 85 You said:
That seems a little low. Just did some rough calculation and 2500 RPM should have you at about 78 MPH assuming stock 235/85/16 tires.

I'm at 1650 at 70 MPH.

I checked to confirm my tire size , rear tires are Dually LT 215/ 85R /16
so it seems that my tires size are little under sized , The front ones are 235. that is odd. Can you please check and shre the speed calculation with this tire size

But Iam guessing that the reason the previous owner put smaller tires:
1- he used 8 plies tires for heavy load on goose neck trialer with a 4.10
2- The spring sure are weak which caused the bed to drop low
Today I started to beef up the spring . I just copied my late F 350 it has 12 leaf. So I bought 2 set of complet spring form a bone yard and be parting to add to my spring.
We added today on one side the bottom 4 springs. it should give me a 4 in of lift plus the added load capacity

I will try to post some pictures.

 

OK, but you asked for it, LOL.

To figure speed based on max engine RPM, you need the tire size, engine RPM and gearing.

Calculating axle RPM at engine redline:

3300 / 4.10 = 804.8780488 RPM

Calculating tire size in inches for 215/85/16 tires:

215 MM x 0.85 = 182.75 MM (this is the cross section height of the tire in millimeters)

182.75 / 25.4 = 7.19488189 (corrected to inches)

(7.19488189 x 2) + 16 = 30.38976378 (this is the tire height in inches, now we need circumference to know how much distance it covers per revolution)

30.38976378 x 3.14(pie) = 95.47225864 (now we need to convert inches to miles)

95.47225864 / 63360 = 0.0015068223 (this is the distance in miles that the tire covers every full turn)

Only now can we calculate the vehicle speed:

804.8780488 RPM x 0.0015068223 x 60 = 72.76848982 MPH at 3300 RPM

(60 is needed to convert the RPM- or revolutions per MINUTE - to RPH - revolutions per HOUR -, so you can get miles per hour)

OK, now for 2500 RPM. Much easier now that we know the tire info for the 215/85/16 tires.

(2500 / 4.10) x 60 x 0.0015068223 = 55.85935244MPH

My calculations do not account for slippage of the torque converter or the tires. Actual tire sizes do vary a lot based on the brand and tread type/condition even if they may have the same size on paper.

 

bad12jr, do you get many speeding tickets?

35" tires, E4OD, 4.10 gears at 2500 RPM.......89.4 MPH

Stock 235 tires and it should be running 79 MPH at 2500 RPM.


You better get your speedo calibrated.

 

So just did the math and i have 3.55 gears. My math was wrong then.
My fuel mileage does suck then. Nevermind. lol

 

Just put on 33's yesterday. I did the math wrong the first time i figured i had 4.10s