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 > 2018 Expedition - Rear spring upgrade

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Sponsored By:
BenK

SF BayArea

Senior Member

Joined: 04/18/2002

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Posted: 07/13/21 11:36am Link  |  Quote  |  Print  |  Notify Moderator

Independent rear suspension (IRS) and adding helper springs introduces different moments & loading vs a live axle.

Also, the lower link is at an angle. As would be the pivot point at the pumpkin attachment area to handle the cantilever moment, the tire/pavement has both forward and reverse.

The stoutness between a live axle and IRS has the Live axle's ability higher.

With that, adding a higher rate coil spring, a better approach vs any of the aux springs that place their contact point on that lower link.

Suggest looking into the highest WD Bars to get more weight off of the TV's rear and WD'd to the TV's front...of course within the TT's tongue 'actual' weight.


-Ben Picture of my rig
1996 GMC SLT Suburban 3/4 ton K3500/7.4L/4:1/+150Kmiles orig owner...
1980 Chevy Silverado C10/long bed/"BUILT" 5.7L/3:73/1 ton helper springs/+329Kmiles, bought it from dad...
1998 Mazda B2500 (1/2 ton) pickup, 2nd owner...
Praise Dyno Brake equiped and all have "nose bleed" braking!
Previous trucks/offroaders: 40's Jeep restored in mid 60's / 69 DuneBuggy (approx +1K lb: VW pan/200hpCorvair: eng, cam, dual carb'w velocity stacks'n 18" runners, 4spd transaxle) made myself from ground up / 1970 Toyota FJ40 / 1973 K5 Blazer (2dr Tahoe, 1 ton axles front/rear, +255K miles when sold it)...
Sold the boat (looking for another): Trophy with twin 150's...
51 cylinders in household, what's yours?...

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