RAT SUN Posted May 20, 2016 Report Share Posted May 20, 2016 What's the best to lower my rear in my 521 I already have 3 inch blocks but I want to lower more since I still have a big gap like 3 inches more. I want the back to look like to gap 1 Quote Link to comment
datzenmike Posted May 20, 2016 Report Share Posted May 20, 2016 Replace the springs with 720 4x4 springs. 3 Quote Link to comment
banzai510(hainz) Posted May 20, 2016 Report Share Posted May 20, 2016 Put taller tires on there to fill in the gap. Example stock rims with stock tire. 2 Quote Link to comment
flatcat19 Posted May 20, 2016 Report Share Posted May 20, 2016 My 521 has 3" blocks and decently tall tires. Let me tell ya-not very comfortable. It looks good though. What wheel/tire sizes do you have currently? Post pics. 1 Quote Link to comment
kelowg Posted May 21, 2016 Report Share Posted May 21, 2016 Remove couple leafs 1 Quote Link to comment
datzenmike Posted May 21, 2016 Report Share Posted May 21, 2016 No. This reduces the spring rate and allows the suspension to travel even farther on a bump. Let's see, truck has 4" of ground clearance and travels 3" closer on a pot hole at 20 MPH. Remove leaf and now truck has 2" of ground clearance and can travel 6" downward on same pot hole at 20 MPH. I suppose the truck might be bottomed out on the rubber bump stops and can't get any lower than 2" above the ground. In this case there is no suspension except the air in the tires. Rubber ball anyone? No suspension movement means the shocks can't absorb the energy and mute it and the beach ball tires rebound uncontrolled 1 Quote Link to comment
mrbigtanker Posted May 21, 2016 Report Share Posted May 21, 2016 What's the best to lower my rear in my 521 I already have 3 inch blocks but I want to lower more since I still have a big gap like 3 inches more. I want the back to look like to gap 4" is about you can go really, after that you need to c notch the rear frame. I am 4" in back and that's about it. And if you are going to c-notch the back you should just 4 link it on coil overs or bags. 1 Quote Link to comment
RAT SUN Posted May 21, 2016 Author Report Share Posted May 21, 2016 I'm trying to upload a picture from my phone but I guess I can't 1 Quote Link to comment
flatcat19 Posted May 21, 2016 Report Share Posted May 21, 2016 Photobucket app. Click picture. Click share icon. Click "Copy to Clipboard." Click the IMG code. Paste that link here. 1 Quote Link to comment
RAT SUN Posted May 21, 2016 Author Report Share Posted May 21, 2016 Here it is 2 Quote Link to comment
RAT SUN Posted May 21, 2016 Author Report Share Posted May 21, 2016 And this is how low I want the back to look like without doing a c notch 2 Quote Link to comment
flatcat19 Posted May 22, 2016 Report Share Posted May 22, 2016 What size of tires? 1 Quote Link to comment
flatcat19 Posted May 22, 2016 Report Share Posted May 22, 2016 This is mine... 3 inch blocks. 2 leafs removed. 195/65R15 tires. Same wheels as yours. 1 Quote Link to comment
RAT SUN Posted May 22, 2016 Author Report Share Posted May 22, 2016 Tires are 195/50R15 1 Quote Link to comment
banzai510(hainz) Posted May 22, 2016 Report Share Posted May 22, 2016 go back to my post #3 I would not do the removed leaf springs as you get axle wrap under hard accell. Just my opinion. go to tirerack or others and get the overall wheel dimension with tire sizes. stock will fell it in best . Im sure you get tallers in 15 but might not look right with 15s 2 Quote Link to comment
flatcat19 Posted May 22, 2016 Report Share Posted May 22, 2016 Total outer diameter of stock wheels/tires is 24.2 inches. I used that number to come up with my set-up. 1 Quote Link to comment
datzenmike Posted May 23, 2016 Report Share Posted May 23, 2016 Replace the springs with 720 4x4 springs. These are very stiff. You might get away with removing a leaf on these. 1 Quote Link to comment
mrbigtanker Posted May 23, 2016 Report Share Posted May 23, 2016 What size wheel, of course 15' but is it 8" wide?, if so that is a good tire choice. Not many offset's work well on these trucks. That tire will be stretched on but will work out well for you. 1 Quote Link to comment
Phixius Posted May 23, 2016 Report Share Posted May 23, 2016 These are very stiff. You might get away with removing a leaf on these. 720 4x4 leafs are SOFTER than 521 leafs. they are stiffer than 620 tho. this is an observation with (3) 521 trucks with the swap. and if you remove one leaf from 720 4x4 pack, it leaves you with ONE leaf. dont run mono... they drop it about 1.5" here is 3" blocks and stock leafs and 3" blocks and 720 leafs 2 Quote Link to comment
datzenmike Posted May 23, 2016 Report Share Posted May 23, 2016 The early 520/l521 were rated at one ton!!! So yes. Later PL521s were rated at 500kg or 1,100 pounds but kept the original springs. Only the figures on the paperwork changed. Forgot about this. I had a '71 and loaded way over a ton on it once. I was more worried about the tires. 1 Quote Link to comment
konig209 Posted May 24, 2016 Report Share Posted May 24, 2016 This is how you do it. 1 Quote Link to comment
mrbigtanker Posted May 25, 2016 Report Share Posted May 25, 2016 This is how you do it. Wow first time I seen your truck with wheels that actually fit right. 4 Quote Link to comment
RAT SUN Posted June 8, 2016 Author Report Share Posted June 8, 2016 Lower on 4 inch blocks and the results were not what I expected 1 Quote Link to comment
wayno Posted June 8, 2016 Report Share Posted June 8, 2016 Did you remove the rubber bump stops in the rear? Use Datsun/Nissan 720 4X4 leafs or 620 mobile home leafs if you can find them. 1 Quote Link to comment
RAT SUN Posted June 9, 2016 Author Report Share Posted June 9, 2016 Yes, i removed the bump stops I have some 4x4 720 springs but haven't install them yet. Btw has any one tried this method yet? 1 Quote Link to comment
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