D series ford

oldfulla,
Mate according to My D series workshop manual.
The 360 motor specs are;

113.5 BHP @2800rpm
262ft.lb torque @1400-1600 rpm

The turbo 360 is :
141.5 bhp @2400rpm
338ft/lb @1700rpm

It also lists all the two speed diff ratios.
The closest to Philips diff is 4.88/6.77:1
It also list a 6.14/8.54:1 (among others) now that would be SLOW :'(

But My book is printed in 1969,& only covers the 4&5 speed G/boxs.
So if philips "D" must be a later built one,& not covered by My book.


My gear chart says 76.2 kmh @ 2600 rpm,With 11R 22.5s. So 65kmh sounds about right.

hope this helps

i reckon you're on the money there oldfulla regarding the diff transplant (petrol)...but then again could it have had a deisel engine transplant into a petrol chassis?

cheers

I don't think there will be the need for too many more calculations ...
Its been road tested, calculated to the nearest few k's with the specs provided, backed up by the manual..

I think you were on the money in the first post Lawrie..
Its a slow truck at present, it requires a ratio change..
It looks like higher ratios were made, according to 'Seed's info..
Next stop will be the wreckers or similar...after a leisurely cruise past the bank..
Even if you were to fit some 10.00 tyres, the gain will be minimal.
Are they a 'standard' Eaton axle?
Would that broaden the hunt if the axles / crown wheel and pinion would interchange??
Are the cargo diffs the same??

Good luck with the hunt..
chocs

thanks for all the info fellas
I will look for another diff as I will have a 90klm drive to get to club events
Cheers Lawrie

Lawrie

What model D Series have you got - A D??

As always I prefex the following with: "I will stand correcting on anything I submitt:.

My memory (potentially faulty) is: the smaller D Series of the 1974 era had 4 speed gear boxes and single speed diffs.

The D700/750 had 5 speed transmissions and 2 speed diffs.

The D 850 had the 8 speed splitter box and single speed diffs.

Then - it changed to (along with the new model designations): the smaller range having the 6 speed sandwich box and single speed diff. And the bigger went to the 8 speed sandwich box and single speed diff.

So - for yours to have a 6 speed box and 2 speed diff seems unusual (I think).

So - Detective may be on the money - in suggesting - it has had an engine and transmission change (380 and 6 speed box from a later model) from a smaller truck - replacing the petrol with a 5 speed box and 2 speed diff combo.

Fit a 4.88/6.77 diff and you should get up around 90 kph I think.

Chocks - my reasioning for suggesting to re-do the cals using the correct tyre size was to obtain a more accurate base line - from which an alternative diff ratio could be applied to the equasion - again presenting a more accurate change/effect it would have. IE: your cal of 77kph vs the supposed actual of 65kph (a 12 kph variance) could become a missleading factor when trying to establish what the most suitable alternative ratio should be.

Oldfulla - over and out .

I think it would be reasonable to say that anything running 20" wheels at around 2500rpm, running a direct box with a 6.5:1 diff....would always be flat out making 80k...
You will need 5:1 or better to do it..
The 4.88 would be close to ideal....

I did an isuzu some time back from 6.6:1 to 5.29:1, made 85kph...
4.62:1 gave it almost 100kph
(in the original format, the isuzu had a huge overdrive and the ratios suited the speed / applications of the day..

these figures are approximates but will give you a fair idea..
theres another 2 shillings worth for what its worth..


PS: do some calcs of your own here...

www.roadranger.com/ecm/groups/public/@pu...ontent/ct_062746.swf

chocs

The compliance plate is missing but on the doors is 1211
I am looking for a taller diff
not many wreck around that I know of over here in the west
Cheers Lawrie

Gidday Andy
Everyone is fine over here . Great news about you and the missus . The 1951 Albion would beat the ford in a drag
Lawrie

hi mate
I have a 1979 d series ford,
it has a 360 turbo and the 6 speed box and a 2 speed eaton #4.
the diff ratio is 5.57/1 in the high range.
the donk is gutless and i don't reckon it would do much good to go any faster than a 5.57 cause it needs another 20 horsepower to be able to use the 5.57 as it is.
if you went to a faster diff,you would only be able to use it down hill,or on the flat if you put up a spinnacer and waited for a tailwind.
the purpose of a d series is to be repowered!

not sure what model D (dumb?) series but from memory there might even be a model where the splines on the axles are different ie if you do a diff centre changover make sure they have the same amount of splines