flint54 Posted August 7, 2011 Share Posted August 7, 2011 My build sheet says the following for the front coils: FRT/SPG RT: "111" LT: "787" FRT SPRG WT RT "0710" LT "0854" From this info I figure that the design weights are different, with the port side being higher than starboard, given the driver and fuel tank, although the difference being only 144lbs doesn't make sense. The info also suggests that the two coils are different, either for height or for rate or possibly both. Anyone able to decipher this info? Thanks! Link to comment Share on other sites More sharing options...
flint54 Posted August 16, 2011 Author Share Posted August 16, 2011 Sooo, no takers on this topic I guess. My front springs are original, so I figured I would grab another pair from the JY. Pulled the pair from the 2001 XJ that I got the D30 3.54 from, hoping they would act a bit younger. Laid them side by side with my original MJ springs and they're nearly 2 inches shorter. WTH?? Same wire diameter, same coil diameter, but totally different height. I don't get it. Truck sags on the drivers side, and rear springs are new. I don't really want to change the front height (it's right where I want it), and I don't really want stiffer springs than original. Any opinions on who's springs I should get? Link to comment Share on other sites More sharing options...
Limeyjeeper Posted August 17, 2011 Share Posted August 17, 2011 I just installed the Moog CC782 Variable Rate Coil Spring. Same length as stock spring. Ride height identical, ride is good. Around $70 a pair. Link to comment Share on other sites More sharing options...
mkbruin Posted August 17, 2011 Share Posted August 17, 2011 My build sheet says the following for the front coils: FRT/SPG RT: "111" LT: "787" FRT SPRG WT RT "0710" LT "0854" From this info I figure that the design weights are different, with the port side being higher than starboard, given the driver and fuel tank, although the difference being only 144lbs doesn't make sense. The info also suggests that the two coils are different, either for height or for rate or possibly both. Anyone able to decipher this info? Thanks! Search my old posts. I threw up a chart with OEM coil springs and their rates, by coil code. It will have all the info you need. Link to comment Share on other sites More sharing options...
flint54 Posted August 17, 2011 Author Share Posted August 17, 2011 Mkbruin, Thanks for providing this lead. However, it still leaves me puzzled. The numbers on my OEM build sheet do not align with anything on your spreadsheet. Also, I'm confused by your "spring rate" column. I've never seen spring rate expressed as anything other than a deflection (lbs per inch of metric equivalent). Link to comment Share on other sites More sharing options...
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