mantas Posted November 28, 2012 Report Share Posted November 28, 2012 Installed my rear kyb shocks last night and since im missing some springs it hasn't improved the bouncy bounce. If anyone has some 720 4x4 please let me know. I'm in SoC[ommunist]al. Thanks. Link to comment
Zeusimo Posted November 28, 2012 Report Share Posted November 28, 2012 Just Letting You Know 720 Springs Will Bounce More Than Stock Springs (They Are Softer) Link to comment
izzo Posted November 28, 2012 Report Share Posted November 28, 2012 Just Letting You Know 720 Springs Will Bounce More Than Stock Springs (They Are Softer) Even the 4x4 ones? You know 510freak has 3 more stereos now since you keep using caps :D Link to comment
Zeusimo Posted November 28, 2012 Report Share Posted November 28, 2012 Thats What I Meant Haha 720 4X4 Springs Are Softer Than 620 Springs So The Truck Will Be Lower But You Will Bounce More And That Makes Your Situation Worse Link to comment
chester Posted November 28, 2012 Report Share Posted November 28, 2012 I never noticed it to be more. Bouncey it made the ride a lot better in my opinion, I am also running 3 inch blocks. I wouldn't advise running the 4x4 leafs and 3 inch blocks because it puts the rear end about an inch from the frame. If you do decide to run it you will have to c-notch or full notch it Link to comment
datzenmike Posted November 28, 2012 Report Share Posted November 28, 2012 Thats What I Meant Haha 720 4X4 Springs Are Softer Than 620 Springs So The Truck Will Be Lower But You Will Bounce More And That Makes Your Situation Worse The hell they are!!! :o :lol: The '84 4x4 spring constant in pounds per inch is 442. The 2wd 720 is 310. The spring constant for the 620 (2wd) is 308. (pretty much the same as the 2wd 720) You will bounce more???? A softer spring will travel up and down further than a stiffer one through the same pot hole or speed bump. The energy is absorbed and released over a longer distance and feels 'softer'. A stiffer spring will flex less and transmit more movement to the chassis. The ride is firmer and more exactly follows the contour of the road. The problem with a lower ride height is you are closer to the pavement. If you keep the same spring rate you will still have the same suspension travel and could bottom out. A higher spring rate will limit the travel so that even though you are closer to the bumps there is less chance of bottoming out. It's the price you must pay for a lower ride.... or rip your muffler off. You pick. It should be noted that the tire is part of the equation. With really stiff or high spring rates the tire flexes and acts like an air bag. Link to comment
mantas Posted November 28, 2012 Author Report Share Posted November 28, 2012 The hell they are!!! :o :lol: The '84 4x4 spring constant in pounds per inch is 442. The 2wd 720 is 310. The spring constant for the 620 (2wd) is 308. (pretty much the same as the 2wd 720) You will bounce more???? A softer spring will travel up and down further than a stiffer one through the same pot hole or speed bump. The energy is absorbed and released over a longer distance and feels 'softer'. A stiffer spring will flex less and transmit more movement to the chassis. The ride is firmer and more exactly follows the contour of the road. The problem with a lower ride height is you are closer to the pavement. If you keep the same spring rate you will still have the same suspension travel and could bottom out. A higher spring rate will limit the travel so that even though you are closer to the bumps there is less chance of bottoming out. It's the price you must pay for a lower ride.... or rip your muffler off. You pick. It should be noted that the tire is part of the equation. With really stiff or high spring rates the tire flexes and acts like an air bag. Well that was exactly my thought - stiffer spring less travel because it has higher resistence to flexing. Does not help that i'm missing leafs. I think i only have 2 or 3 on each side. The KYB shocks helped a bit but not to the extent i expected. And im absolutely fine with a stiff ride, matter of fact i would love to put in some coilovers but i don't have the fabrication skills required. The other thing is, my exhaust will be the first to go if i bottom out, i realized last night the shop welded it too damn low. Link to comment
oldskoolvws Posted November 28, 2012 Report Share Posted November 28, 2012 I'm going this route: http://thesuspensionsource.mybigcommerce.com/belltech-86-97-nissan-truck-leaf-springs-pair/ Link to comment
datzenmike Posted November 28, 2012 Report Share Posted November 28, 2012 "About This Part: Belltechs leaf springs are designed to lower the rear of your truck and retain your smooth factory ride. All Belltech leaf springs come complete with OEM quality rubber bushings." To retain the 'smooth factory ride', the spring rate has to remain the same. As I said, a lowered ride height on the same spring rate is a disaster waiting to happen. Link to comment
Zeusimo Posted November 28, 2012 Report Share Posted November 28, 2012 So If You're Missing Springs And Swap In 720 4X4 Springs I Would Think Your Ride Will Be ABIT Stiffer If Not The Same BUT The Truck Will Be Lower Link to comment
mantas Posted November 28, 2012 Author Report Share Posted November 28, 2012 So If You're Missing Springs And Swap In 720 4X4 Springs I Would Think Your Ride Will Be ABIT Stiffer If Not The Same BUT The Truck Will Be Lower Yeah lower is not really a big deal. My rear is about 1.5" higher than the front. Worst case scenario i could go with smaller blocks in the back or lower the front a bit. Link to comment
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