Increasing the Road Speed of a WD45

Other than using larger rear tyres, has anybody got any ideas on how to increase the road speed of a WD45 ? Could the gears in the final drives be changed or reversed ? Tractor caravans or tractor treks in our langauage are run at about 18 mph and I'm looking for an Allis that would keep up, with good economy.

isn't the diesel rear geared lower because of the higher RPMs? I had the same idea but I don't think that's right

14.9 x 38" tires and a 175 govenor spring should get the job done. The diesel rear end will make it slower.

I do several caravans and think that is tough for a 45, 38 inch tires and different governer spring is best option but may still be hard to get 18mph. just my thoughts.

In New Zealand I'm pretty limited as to what axles I can exchange as no D series and only 2 WD45 Diesels came here. I like Charlie's idea of the extra WC gearbox and they're plentiful here. I'll investigate this option further.

As for being an International club trek, they are there but the opposition comes from other British makes, David Brown, Fordson, Nuffield, Massey Ferguson etc. Only good for speeding to the local garage to be repaired, not like AC which were geared for work in the field.

I can't see the point in racing between stops on a trek. I thought the whole point was enjoying yourselves and seeing the countryside? I can't seem to convince the other participants that this should be the case.

Edited by OrangeKiwi(NZ) - 10 Jan 2012 at 1:12pm

The IHC M was faster on the road than the WD, WD-45. But those Allices would haul a load better, the M's had to shift down on a hill long before the AC's did. 

you guys are great with ideas - I like the car rear end - what about a "C" Allis (not the ED pills)  any way to speed this little unit up for tractor rides - 8 mph is tuff my customer found out.

My notes say a WD45 with 14.9 x 38's at 1400 rpm goes 13.8 mph.....at 2000 rpm (D17 governor spring) it would be 19.7 mph. A 14.9 x 38 (63 inch diameter) is just a bit larger in diameter than a 15.5 x 38 (61 inches)....this info is for Firestone rear tires.

How about a 4x4 front axle under the front powered by the pto?

Dr im very impressed 

Ryan he wants to keep up with the tractor drives that run 18+ MPH. 

Edited by CTuckerNWIL - 09 Jan 2012 at 8:11pm

For the mathematicians out there; how fast would the tractor go if you cut the bull gear out and ran the back wheels off the output shaft at the final pinion? I'm guessin a little too fast for 4th gear.

Orange Blood wrote: Well if we are going to all this modification, why not put a blown 454 in the darn thing!!!  :-)

....at 4000 rpm problem is solved!

They say the little fords with the sherman overdrive is good for road trips. they don't make an overdrive like that for the wd/45?

Wouldn't take a 4545, just a little inline Ford I block 6 from the late 50s would have enough power and hide under an extended hood better. Maybe even a 2 L overhead cam engine.

Gerald J.