10 replies to this topic

[mudunit77f250]

im interested in doing a shackle flip in the rear on both my 77 and 79 to gain some lift.... how much lift will i gain my doing this flip?? 1"? im already tucking 35s and 36s, i just want to go with more height. i plan on just zipping off the factory rivets and just flipping the bracket and shackles.... as far as re attaching them to the frame, im planning on just using grade 8 bolts of the same size as the rivets, please inform me if this is the proper way of doing this. also i am wondering if there are any big downfalls to doing this bracket flip??? i cant think of any unless i was looking at steep driveline angles, which i dont believe i am..... thanks alot

[highboy73]

i think around 5 inches.i'd guess maybe driveline angles too.alot of folks have done it and i was just reading about it at http://www.73-79ford...om/Techtalk.htm

[STLKIKN]

Highboy is correct... with stock springs in good shape, you should get around 5" of lift. Believe it or not, the driveline angle will actually be pretty good, you may need to correct slightly with shims, I have seen all three possibilities with shims (none, wedge to the back, and wedge to the front) it will be a matter of install and measure.

[Broncoholics]

Better get yourself a D60 up front for those 39's. I run 38.5" SX's and snap Spicer 5-760X u-joints like twigs on a F250 D44. The shafts are weak too.

[mudunit77f250]

i understand that the 44 and 9" cant take the tire size.... i would run the 35s i have now on that set up and do the flip then get the 60/70 setup installed then get big ol tires.....

[highboy73]

how you lifting the front?

[Broncoholics]

Actually the 9" is pretty strong and will hold up to large tires. The D44 is weak due to the u-joints. Your D60/70 idea is the way to go just a spendy conversion in just wheels, tires, gears, lockers and 4 link suspension.

Lifting the front 5" might require a special driveline from http://highangledriveline.com/ due to the angle when the suspension drops. Its usually not a problem unless you jump your rig. Jack up the front bumper until the tires come off the ground and see if the driveline still turns when you're finished.

[Seabronc]

That is a great link you put on there Highboy. I don't have a 73-79, but my son-in-law does.

[highboy73]

lot of useful info,wish i could find more for the trucks
thanks

[Billz4x4z]

Thought i make this easier than reading all the other stuff which is good info also
FACT !
YOU CAN DO AN EASY LIFT ON THE REAR OF YOUR TRUCK WITHOUT SPENDING A LOT OF MONEY FOR NEW SPRINGS AND BLOCKS. HOW YOU DO IT FIRST OFF YOU MUST GO THROUGH ALL JACKING UP THE TRUCK AND THE SAFETY STUFF TOO. DON'T WANT THE TRUCK FALLING DOWN ON TOP OF YOU "NOT GOOD"! THAT AND I DON'T WANT YOUR WIFE OR GIRLFRIEND COMING AFTER ME. JUST KIDDING, ANY WAYS BACK TO THE BUSINESS AT HAND FIRST OF ALL YOU MUST REMOVE THE REAR PART OF THE SPRING FROM THE SHACKLE AND THEN AFTER YOU DO THAT, YOU NEED TO TAKE A TORCH AND CAREFULLY CUT THE HEADS OFF THE RIVETS. THEN YOU WILL NEED A LONG PUNCH TO DRIVE OUT THE RIVETS.
ONCE YOU HAVE DONE THIS YOU WILL NEED TO DRILL OUT THE RIVET HOLES WHICH ARE 7/16" HOLES TO 1/2" HOLES. ONCE YOU HAVE DONE THIS THEN YOU CAN GET READY TO REMOUNT YOUR SHACKLE MOUNT BRACKET, BUT NOW BEFORE YOU REINSTALL THE BRACKET TURN IT UP SIDE DOWN AND MOUNT IT TO THE FRAME RAIL. THIS WILL GIVE YOU BETWEEN 4 1/2" TO 5" OF LIFT TO THE REAR SUSPENSION. IF YOU HAD STOCK BLOCKS IN THERE REINSTALL THEM. ONCE YOU HAVE HOOKED UP YOUR SPRING TO THE SHACKLE YOU WILL NOTICE THAT THE PINION WILL BE POINTED UP TOWARDS THE TRANSFER CASE MORE. THIS WILL NOT HURT THE U-JOINTS. I HAVE READ IN ANOTHER FORD TRUCK SITE ( I WON'T MENTION ANY NAMES ) THE IT WILL TEAR UP THE U-JOINTS WELL I AM HERE TO SAY, THAT'S B-S SOMEONE IS TALKING OUT THEIR TAIL SECTION. MYTH NUMBER TWO IS THAT THE AXLE IS MOVED CLOSER TO THE FRONT. NOT TRUE!!!! IN ORDER TO DO THAT YOU WOULD HAVE TO RELOCATE THE FRONT HANGER MOUNTS FORWARD. ANY TIME YOU DO A LIFT ON THE FRONT OR REAR AXLE YOU WILL MOST LIKELY NEED TO POSSIBLY LENGTHEN THE DRIVE SHAFTS IT WILL DEPEND ON THE AMOUNT OF LIFT YOU DECIDE TO GO WITH.
" SPECIAL NOTE"
ON THE 78-79 BRONCO'S THERE IS A WEDGE BETWEEN THE SPRING AND AXLE SPRING PERCH THIS MUST BE REINSTALLED OR YOU WILL HAVE TO MUCH ANGLE ON THE REAR DRIVE SHAFT AND YOU WILL END UP BREAKING THE U-JOINT AND POSSIBLY THE YOKE TOO.
ALSO ON THE BRONCO THE REAR SHACKLE MOUNT BRACKET MUST BE MOVED FORWARD 1 1/2" INCHES OR YOU WILL NOT GET THE RIGHT SPRING SHACKLE TRAVEL.
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