by Old Skool Wed Sep 17, 2014 9:43 pm
The 9" first came in ours in 63 and ONLY as a H/D version. ANY H/D from the factory had a 9" in it regardless of the engine size. There being two reasons for the 9". Firstly of course if you had any engine larger than the reported rare 200 it needed a stronger rear axle. I was the person speaking about the 240 and it always having a 9" in it as Ford would not stand behind the smaller rear axle in a larger motor. Pretty basic there. Stronger motor needing a stronger rear axle. In addition to that, the other reason for the Econoline 9" rear axle for a larger motor was that it had larger brake pads. Again,, why put a big motor in it and not be able to stop the truck????
Over the years, doors and badges get changed and so if the doors say H/D on them but you have the smaller rear axle chances are they didn't come from the factory that way.
Because 65 was the 1st year that a 240 was available Ford had to also make the doghouse TALLER for the larger motor option and instead of making two different doghouses they simply used the same for either engine option, of course also adding the hump in the rear for added bellhousing clearance. First realizing there was an issue there with the one year only 64 donout mount C4 and having to lower the engine height because of no bellhousing clearance for it.
From 65 to 67,,, EVERYTHING is a bolt on or in. You can simply take any part on the lates and bolt it into another late. In order to make things easier, they simply made the cross member towers different for a small six versus the large six (240). The frame mounts and the cross member itself are identical for all the lates,, the only difference being in the towers that the motor mounts bolt onto.
The radiator support is the same, so on, so on.
The key in having a 67 is that it was the ONLY year Econoline to have the highly sought after DUAL master cylinder, which makes putting in disc brakes easier. Some of the Federal laws requiring padded dashes, dual master cylinders and back up lights. If you look at a lot of cars and trucks the back up lights are a dead give away if its a 67 or later...
In regards to the gearing. Gearing and engine size are directly related and work together, with gearing ALWAYS a compromise of something?? A smaller motor needing help with gearing and so the reason for high gearing with a small motor. The motor just doesn't have the oomph to pull the load and needs the gearing. The COMPRIMISE being the truck does NOT LIKE THE FREEWAY speeds because of the gearing. With a larger motor it has more pulling power and so you can run a stiffer gear and a higher top end speed without revving the motor like a sewing machine... gearing always a compromise of something....
The Dag box pretty well known for a low 1st and a high rear end gearing in order to make up for no power,,, It being intended to pull the weight, with a smaller motor and not to cruise at 70... Never designed for it. 3rd gear is always 1/1,,, the differences being in the gearing pattern to get there. The Dag even being 1to1 in 4th gear. The idea in it being an extra low 1st the same as a GRANNY box in order to get the truck moving and usually in the 4:00 gearing regardless of a 9" or a 7:25. Actually having three of the small rear ends here with the high gearing for that reason.
With 63 being the 1st year for the H/D version and the 9" axle the drive shaft used the smaller front u joint of the smaller 170 transmission (the larger input shaft and differently geared 240 transmission not available until 65) and the larger 9" u-joint. So, the 63 and the 64 H/D versions using a special drive shaft with two different sized u-joints in it. Like mentioned there being a lot of drive shaft lengths,, hearing from 9 to now 13,, ?? Drive shaft lengths the least issue of anything...
The 240 three speed manual with a larger input shaft, larger clutch AND different gearing than the 170 three speed manual because of the larger motor.
I have worked on a LOT of 200's in our trucks, and they are a GREAT little motor. VERY SNAPPY and will easily spin the rear tire if you want to, very economical and a very good choice. It wont have the grunt that a 240 or a 300 has but it will certainly get it on.... Personally I think its a very good choice for ours with the 3:50 gearing seeming to be the best COMPRIMISE as I see it.
You cannot go wrong with the 9" rear axle, it may weigh a little bit more but IMO in the big picture the ease of changing gear ratios and having the larger 2 1/2" brakes is well worth it.
Vic