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Old 01-13-2018, 11:52 AM   #1 (permalink)
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SAS 2003 Duramax help

Right now after installing a leaf sprung 91 ford dana 60 the trucks front sits an inch higher in the front. The rear end has 4 inch blocks from previous lift kit.

The leafs are off an 87 or 88 k20 rear end. 56 inch springs with 4 leafs plus overload. They are flat or maybe worse after a month on the road. About 1200 miles on the swap.

What I want to end up with is at most a 3 inch block on the rear end and lower the front end 2 inches or more. Hopefully without re-working my shackles. If I remove the left over overload that will help but im worried about the spring bending back to far. Ive got pics let me know what you think I could do.

I still need to regear for the 4wd so no driveshaft yet. No track bar either, hasnt been offroad yet. Still have to finish grinding off the factory control arm mounts
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Old 01-13-2018, 11:55 AM   #2 (permalink)
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Few more.
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Old 01-13-2018, 12:00 PM   #3 (permalink)
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Take out the add an inch first off. Show us pics of the front mount points as well...
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Old 01-13-2018, 12:02 PM   #4 (permalink)
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Start by taking out the overload/zero rate. That’s an easy 3/8” - 1/2”. Then put a bumper on it. Measure again.
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Old 01-13-2018, 12:17 PM   #5 (permalink)
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Thanks, heres the front mount pics
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Old 01-13-2018, 12:41 PM   #6 (permalink)
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Redo the front mounts and cross member, and you can lose an 1 1/2 there too. Doing what has been mentioned could net you 2" lower ride height in the front.
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Old 01-13-2018, 12:47 PM   #7 (permalink)
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Thanks I'll update when I finish it
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Old 01-13-2018, 12:55 PM   #8 (permalink)
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Redo the front mounts and cross member, and you can lose an 1 1/2 there too. Doing what has been mentioned could net you 2" lower ride height in the front.
IFS frame just aren't forgiving when trying to stay low on leafs.

Ride quality was damned at the start of the swap. I would run the shackle in the front, and french the rear spring hanger into the frame under the body mount. That would drop it considerably.
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Old 01-13-2018, 12:56 PM   #9 (permalink)
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IFS frame just aren't forgiving when trying to stay low on leafs.

Ride quality was damned at the start of the swap. I would run the shackle in the front, and french the rear spring hanger into the frame under the body mount. That would drop it considerably.
Or go SUA
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Old 01-13-2018, 01:02 PM   #10 (permalink)
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Or go SUA
That would be easier.
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Old 01-13-2018, 01:06 PM   #11 (permalink)
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IFS frame just aren't forgiving when trying to stay low on leafs.

Ride quality was damned at the start of the swap. I would run the shackle in the front, and french the rear spring hanger into the frame under the body mount. That would drop it considerably.
I would take the tube cross member out, put a plate cross member in its place tight to the bottom of the front frame horns, gusset above that with the old tube between the frame rails for strength, and cut 1/2 or more out of the spring mount tabs. There's room to get some height out of it imo.
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Old 01-13-2018, 01:08 PM   #12 (permalink)
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Or go SUA
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That would be easier.
Not enough room for up travel unless he goes to lift springs.
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Old 01-13-2018, 01:22 PM   #13 (permalink)
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Quote:
Originally Posted by Black Sheep View Post
IFS frame just aren't forgiving when trying to stay low on leafs.

Ride quality was damned at the start of the swap. I would run the shackle in the front, and french the rear spring hanger into the frame under the body mount. That would drop it considerably.
Or go SUA
I thought about front shackles but I didnt want to worry about a track bar right now. I was told that a spring under wouldnt work with my axle.
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Old 01-13-2018, 01:28 PM   #14 (permalink)
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Quote:
Originally Posted by Black Sheep View Post
IFS frame just aren't forgiving when trying to stay low on leafs.

Ride quality was damned at the start of the swap. I would run the shackle in the front, and french the rear spring hanger into the frame under the body mount. That would drop it considerably.
I would take the tube cross member out, put a plate cross member in its place tight to the bottom of the front frame horns, gusset above that with the old tube between the frame rails for strength, and cut 1/2 or more out of the spring mount tabs. There's room to get some height out of it imo.
What size plate? 3/8ths? I think this will help with caster angle too but im wondering if I should make up 1 inch shorter shackles also
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Old 01-13-2018, 01:29 PM   #15 (permalink)
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What size plate? 3/8ths? I think this will help with caster angle too but im wondering if I should make up 1 inch shorter shackles also
1/4 is plenty if you do it right.
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Old 01-13-2018, 05:41 PM   #16 (permalink)
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Picking up steel on Tuesday for front mounts and new center pins because I'll have to cut these to remove the overload block. Is there a better shock option to help with ride quality. These are rough country shocks. 4 inches up travel. Hopefully without changing the factory mount
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Old 01-16-2018, 06:29 AM   #17 (permalink)
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Does anyone know if a ring and pinion from a 99-14 super duty axle will fit a 91 dana 60, king pin high pinion pulled from f350
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Old 01-16-2018, 07:18 AM   #18 (permalink)
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from what i understand, as long as you use the same series carrier, they are compatible. I.e. 4.10 down, 4.56 up.
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Old 01-16-2018, 09:28 AM   #19 (permalink)
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Ok, Im going to try it.
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Old 01-17-2018, 12:04 AM   #20 (permalink)
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Does anyone know if a ring and pinion from a 99-14 super duty axle will fit a 91 dana 60, king pin high pinion pulled from f350
If a 99-02 axle be sure it is a D60, and not a D50.
Pinion nut on a Dana 60 is 1 5/16" the d50 nut is smaller.
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Old 01-19-2018, 10:48 AM   #21 (permalink)
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Had to order a 1.5 inch drop pitman because my axle wont clear my 1104 pitman after I lower the truck. I talked to trevor this morning and he also helped me out with my turning radius. Now I dont have to think about moving my axle back. Finally got the steel I need to make a new front crossmember for the leaf springs. And ordered the gears I need for the front axle.
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Old Yesterday, 12:23 PM   #22 (permalink)
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Will adding a shim to adjust caster add to lift height? Im thinking it will only rotate the axle.
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Old Yesterday, 12:41 PM   #23 (permalink)
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Will adding a shim to adjust caster add to lift height? Im thinking it will only rotate the axle.
Not enough to matter.
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