Leaf Springs

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Leaf Springs

Postby mixman98 » Sun Dec 03, 2017 10:18 am

I've read countless posts on which leaf spring is the best on to remove and am more confused than before I started reading them. The truck is an '89 with the stock springs that is going to be used mostly for the street with an occasional pass down the track. I plan on making a set of slapper bars as soon as I can get some plans on how to make them (rickracer is working on this for me). It seems like a lot of people are removing the second spring from the top of the pack. While at the same time, there are countless post where people say no, that's not the right spring to remove. I'm just trying to get some good info on which spring to remove that has good results on getting some power to the ground without the tires spinning easily and without wheel hop.
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Re: Leaf Springs

Postby lowblazin94 » Sun Dec 03, 2017 10:27 am

You will for sure remove the over load spring. Post a picture of your springs and we will FOR SURE tell you which one to remove
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Re: Leaf Springs

Postby mixman98 » Sun Dec 03, 2017 12:01 pm

I'll do that as soon as I get home from work tonight at 8. Thanks
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Re: Leaf Springs

Postby mixman98 » Mon Dec 04, 2017 7:49 am

Ok guys, here are a couple of pics of the stock rear springs of the '89 P/U. Which one (s) should be removed to help with better traction when using slapper bars?
Image
Image
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Re: Leaf Springs

Postby XXXXXXXX » Mon Dec 04, 2017 2:17 pm

I did a lot of reading on this subject here... this is what I recall.
1) Most pull the 2nd leaf and the 4th leaf.
2) Some pull the 3rd leaf and 4th leaf.

I did it both ways listed above.. To be honest I just don't remember exactly what the results were other than.. I don't think it changed the ride height on in the rear either way. I ended up leaving the 1st and 2nd leaf in. I did this mainly after a conversation with a member here who had used the 1st and 2nd leaf and either caltracs or home made caltracs and 1.4 60' footed with his truck. I can tell you with the 1st and 2nd leaf I hooked like glue with the tbars.. haven't had the same experience since I put the caltracs on.

Also most will say that pulling the leafs will lower the trucks by 2-3 inches.. mine didn't change much.. maybe 1/2 or 1 inch either way after I pulled both ways listed above.

X
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Re: Leaf Springs

Postby mixman98 » Mon Dec 04, 2017 3:28 pm

Ok thanks X. So with keeping only the 1st and 2nd springs and using traction bars, you had better launching results than with the Caltracs. I'll be honest, I've never fooled with rear leafs before. Do I need to buy any type of shim or do something to keep the two remaining springs in place after I remove the 3rd and 4th springs?
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Re: Leaf Springs

Postby Rickracer » Mon Dec 04, 2017 5:38 pm

On my black truck, with a spring pack just like yours, I removed the 3rd leaf, left the overload, and it dropped about 3". That's a P295/50-15 tucked under there.... 8)

Image

Image
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ASE Certified Master Automotive Technician (well over 3 decades of experience, :thumbup: )
'93 S10 SB,RC, Comp XR276 Hydraulic Roller, Vortec head 363, 400 + hp, built 700R4, JW 2800 stall lockup converter, 3.73 posi, disc brake, narrowed 8.8 Exploder rear, LS Camaro front discs, Cal-Trac clone traction bars, Best N/A passes to date: 7.76 in the 1/8th, 12.24@109.27 mph in the 1/4, gonna spray it one of these days... :mrgreen:
76 Chevy Vega Drag Car, TWIN TURBO 355, P/G trans w/ brake and JW 4000 stall vert, 4 link back half, narrowed 9", 3.50 gears, 29.5x10.5W ET Drags. Best time9.669 @ 139.79, Latest video: https://www.youtube.com/watch?v=S59riYn ... ata_player
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Re: Leaf Springs

Postby lowblazin94 » Mon Dec 04, 2017 7:23 pm

As long as you have good shocks and the bars set right you will be ok. Wont be hauling any loads and some bars interfere with overload spring
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Re: Leaf Springs

Postby mixman98 » Tue Dec 05, 2017 4:27 am

Guys, when I remove a spring, do I need to get a shim of some sort to make up for the space of the removed spring? How does your truck ride with that 3rd spring removed Rick? My truck will be driven on the street most of the time.
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Re: Leaf Springs

Postby lowblazin94 » Tue Dec 05, 2017 5:53 am

No just remove the leafs then put them back together. I removed the overload and bottom one from mine before I got it back together. The shocks and traction bars will make up for the spring rate
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Re: Leaf Springs

Postby Rickracer » Tue Dec 05, 2017 8:08 am

My black truck rode much better (smoother) than my current truck, but did not handle as well. It carried weight OK because I put some big cushy bump stops in there to keep the fenders off the tires when towing or carrying a lot of weight (like a dozen or so kids, LOL). :lol:
Current truck has Belltech 3" drops in it, it's pretty stiff, but carries weight very well, and handles better than most ponycars, even new ones. :thumbup:
Rickracer
ASE Certified Master Automotive Technician (well over 3 decades of experience, :thumbup: )
'93 S10 SB,RC, Comp XR276 Hydraulic Roller, Vortec head 363, 400 + hp, built 700R4, JW 2800 stall lockup converter, 3.73 posi, disc brake, narrowed 8.8 Exploder rear, LS Camaro front discs, Cal-Trac clone traction bars, Best N/A passes to date: 7.76 in the 1/8th, 12.24@109.27 mph in the 1/4, gonna spray it one of these days... :mrgreen:
76 Chevy Vega Drag Car, TWIN TURBO 355, P/G trans w/ brake and JW 4000 stall vert, 4 link back half, narrowed 9", 3.50 gears, 29.5x10.5W ET Drags. Best time9.669 @ 139.79, Latest video: https://www.youtube.com/watch?v=S59riYn ... ata_player
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Re: Leaf Springs

Postby mixman98 » Tue Dec 05, 2017 10:14 am

Thanks so much guys. I'd sure as hell be lost without all of your help. One more question then I should be ok for a bit. What is the proper way to set the pinion angle? I've read that I'm looking for a 4 degree pitch from the driveshaft flange on the rear pointing upward towards the trans. Do I set this with the springs decompressed with no load or do I need to get down to the ride height? I currently do not have tires for the rims I have, so if I need to set it at the ride height, what's the best way to do that? crap, I guess I had three more questions...
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Re: Leaf Springs

Postby lowblazin94 » Tue Dec 05, 2017 11:47 am

Remove leafs. Put truck on ground, which tires/wheels does not matter. Jump on bed of truck to make sure it is settled.

Then measure tailshaft angle and then measure rear angle. You want them to match but the rear will slightly move up which is why most people do a 2 or 3 degree difference
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Re: Leaf Springs

Postby lowblazin94 » Tue Dec 05, 2017 11:50 am

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Re: Leaf Springs

Postby mixman98 » Tue Dec 05, 2017 1:15 pm

I should've been more clear. I have new wheels that DO NOT have tires mounted on them. Is there a way to set the pinion angle without wheels and tires mounted on the rear diff?
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Re: Leaf Springs

Postby lowblazin94 » Tue Dec 05, 2017 1:29 pm

Just put jackstands on the axle and let the weight settle
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