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I put my Ford 9" under, with my lift. Seems that the drive line only has about 1/2" play in it and is almost fully extended. Do I need to take it to a driveline shop and have it lengthened 2"?
thank you
The short answer is, yes, that needs to be lengthened.
Now, if that pic is with the suspension fully extended you may be able to get by, but it's far from ideal.
If you have it lengthened, don't forget it needs plenty of room to collapse as the suspension compresses (especially on a lifted truck) so measure carefully. A 'Too long' driveshaft can cause some real damage if the slip yoke bottoms out prematurely.
Look at your Driveshaft angle and your Axle Pinion angle, they should be very close. If you have to degree you axle, that may actually help with your driveshaft travel.
First might want to figure out what has changed to cause that.
It's possible someone just grabbed one off a different truck that fit the splines but was too short or maybe someone swapped trannies and didn't get a correct length shaft.
You're saying you just installed a suspension lift? If so, how much did you lift it?
Otherwise, what they all said. Your pinion angles need to match with single-cardan joints (or be within a certain range with double-cardan joints), and you should be on the ground at full weight when measuring anything.
But the bottom line is that over a certain amount of lift, you probably just need to buy longer shafts or have yours lengthened.
The truck was "upgraded" to a Dana 60 in the back. It's a 1972 4x4 f100. One thing I am wondering is if the rear springs have been altered as well over stock. The lift came with lift blocks that are angled. I guess I'll do more digging.
Is that an 8 lug D60? If so, change your front D44 knuckles/outers to 76-79 D44 8 lug knuckles/outers to match and have disc brakes. As I remember it from the 80's, it was a popular conversion for 78-79 Big Broncos.
I can't remember if stock Ford springs are stamped with a part number.
Don’t assume that blocks are “lift” blocks.
These trucks came stock with anywhere from 1 1/2 to 4 1/2 inch tall spacer blocks between the leaf springs and the axles to give the truck a proper level when coupled with the taller front suspension of a four-wheel-drive.
many factory blocks had an extension at one side to contact the bump stop on the frame. Some even had loops cast into them to retain the U-boats.
Are yours matching either of those descriptions?
And they look kind of like stock springs from here, but may be a better picture of them from the side would tell the tail. As well as some shots of the blocks.
Never mind. I see that they are factory blocks with the extensions.
Now that I’ve been able to expand the picture it also looks like original springs to me. Or a very old springs, and back in the day very few people made lift springs for the rear of our trucks.
Chances are very good that they are stock.
What is the exact model and the GVWR rating of your truck?
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