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Old 06-19-2013, 06:24 PM   #1
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New Front Coils for V8 swap

Hey guys looking for recommendations on new front coils now that I have a SBC in my old SE. I currently run a 2.5" front coil spacer on 31's and with the extra weight of the V8 (about 150 pounds I think from the inline 4) I am definitely sagging and having pretty good dip on braking. My question is are my original springs wore out or is the weight difference that dramatic? I am not the original owner so I do not know the history of the Jeep. Did the 2.5L engines have lighter springs than the 4.0L because the weight diff between stock 4.0L engine and the 99 sbc is minimal. I was looking at Rusty's 3" TJ coils but unsure if I should go standard coil or their HD coil. I can find no documentation on what stock Jeep spring rates are.
Any insight will be appreciated!
Terry

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Old 06-19-2013, 06:29 PM   #2
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ZJ V8 coils would probably help and put you close to stock height, or slightly taller.

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Old 06-19-2013, 06:34 PM   #3
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My 5.3 fit fine and level with stock 2.5 springs. I swapped to rustys 2" springs to add additional clearance for the power steering pump.

What v8 did you get? I know the 5.3 isn't that much heavier that the 2.5 and is lighter than the 4.0.
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Old 06-19-2013, 10:28 PM   #4
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If its the Iron block 99+ 5.3L Vortec engine it it 30lbs or 40lbs lighter then the 4.0L. The aluminum version is 90lbs lighter!
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Old 06-19-2013, 10:39 PM   #5
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You could always swap in 79 bronco coils the stock ford coils give a TJ with 4.0 and winch+bumper about 3" of lift
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Old 06-19-2013, 10:57 PM   #6
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XDR and Green, I put a L31 '99 5.7L Vortec out of a Suburban, cammed it and bored .030 over. I know the weight difference between the 4.0 and the vortec is minimal but since this went into a wrangler roller that had a 2.5 I just don't know if the springs are shot or there are different springs put in the 4.0. that are stiffer than the 2.5 L. The build code for the SE says SDAP Normal Duty Suspension, but I have no info on what that is in terms of roll rate or compression rate to shop new ones. I have heard good things about Rustys but not sold on them if there are better alternatives. For $100 I am happy to fork that out. Just want to do it right the first time.
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Old 06-21-2013, 10:12 AM   #7
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ZJ V8 coils would allow me my 2" lift without my coil spacers? That would be worth doing if I can scrounge them. I assume both 5.2L V8 and 5.9L V8 in the ZJ were the same coil?
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Old 06-21-2013, 10:33 AM   #8
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Quote:
Originally Posted by Carlos98TJ View Post
ZJ V8 coils would allow me my 2" lift without my coil spacers? That would be worth doing if I can scrounge them. I assume both 5.2L V8 and 5.9L V8 in the ZJ were the same coil?
maybe...depends how much your front end weighs.

look for the "up-country" V8 version.

junkyard springs are cheap, so if they don't do exactly what you want, you're not out much. alternatively, OME 934's (V8 ZJ lift springs) would certainly provide more than 2" of lift with your setup

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coil springs , lift advice , v8 conversion

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