Ford Highboy Custom lift kit
Moderator & parts slinger
Joined: Feb 2007
Posts: 50,186
Likes: 5,792
From: S/W Missouri, Polk county
Check out Atlas Suspension they have up to a 6" or even 8" for up front. 6" only for the rear of a HB with 2 1/4 wide leaf springs. 8" is available for the front, just NOT the rear with the 2 1/4 wide HB leafs.
https://www.mcssl.com/store/atlassus...and-rear-combo
https://www.mcssl.com/store/atlassus...and-rear-combo
Moderator & parts slinger
Joined: Feb 2007
Posts: 50,186
Likes: 5,792
From: S/W Missouri, Polk county
I'd call and ask them on the axle push. Maybe to decrease the d/s pinion angle.
Think of the rear block as a leverage or fulcrum point. The one OEM block is not bad, I mean the factory designed it, so 1 is ok. The bigger the block or the space (like normal lift kits just have you stack blocks) from the leaf spring and the axle the more or easier you can get axle twist.
Moving the axle further from the spring (in a geometry sort of way) multiplies the power/torque from the motor thru the drive line to the axle. Under acceleration the torque on the axle is feed back into the leaf springs. AKA spring wrap or axle wrap. Great way to wreck some drive line u joints. Leaf spring S twist ='s axle rotated ='s pinion angle changes='s easy way to exceed a u joints work radius.
Deleting the block and having a true all springs lift takes out a large percentage 98.237% chance of the axle wrap. lol Mostly applies in high horsepower rigs. Axle shims will probable still be needed.
With this new lift do not forget to $ factor in new shocks, and longer brake lines X3. Drop pitman arm and an adjustable steering drag link. A lot of this is being discussed right here.
https://www.ford-trucks.com/forums/1...ing-block.html
Think of the rear block as a leverage or fulcrum point. The one OEM block is not bad, I mean the factory designed it, so 1 is ok. The bigger the block or the space (like normal lift kits just have you stack blocks) from the leaf spring and the axle the more or easier you can get axle twist.
Moving the axle further from the spring (in a geometry sort of way) multiplies the power/torque from the motor thru the drive line to the axle. Under acceleration the torque on the axle is feed back into the leaf springs. AKA spring wrap or axle wrap. Great way to wreck some drive line u joints. Leaf spring S twist ='s axle rotated ='s pinion angle changes='s easy way to exceed a u joints work radius.
Deleting the block and having a true all springs lift takes out a large percentage 98.237% chance of the axle wrap. lol Mostly applies in high horsepower rigs. Axle shims will probable still be needed.
With this new lift do not forget to $ factor in new shocks, and longer brake lines X3. Drop pitman arm and an adjustable steering drag link. A lot of this is being discussed right here.
https://www.ford-trucks.com/forums/1...ing-block.html
Fleet Mechanic
Joined: Jul 2009
Posts: 1,303
Likes: 46
From: KCMO
How sharp are your fabrication skills ?
Lead Driver
Joined: Mar 2004
Posts: 8,922
Likes: 153
Now would be the time to get rid of the rear 2 1/2" springs, spring hangers and shackles and get all 3" parts. Then you could buy 3" rear lift springs and have a better ride too.
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SwampBilly
1973 - 1979 F-100 & Larger F-Series Trucks
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Jun 13, 2006 12:23 PM
