Spring rate vs Load rating?

[BrownRangers]

Does anyone know the spring rate of the 1050lb(load rating) rear leaf springs and/or the 1350lb.

Spring rate would be more in the 200-300 lbs I would assume.

I was going to try to fit some fiberglass leaf springs from a different application into my truck. Thinking I might want to get some air bags to assist if I end up still using it as a truck.

Thanks for any input.

 

[55trucker]

Removed from the vehicle spring rate is the mount of downward pressure applied to the centre of the leaf spring assembly to compress it 1 inch.

To find out what yours are you would have to find a spring shop that actually has a leaf spring spring rate tester, not many do.

 

[pjtoledo]

"hold my beer" method of determining spring rate.

place jackstands under rear axle, you want to measure springs not tires.
accurately measure fender to ground on both sides.
have a 200 lb buddy stand directly over rear axle, bounce & settle then measure
remember that's only 100 lbs per spring
2 buddys, 3 buddys , or anything you can weight accurately.


it's a slow night

 

[don4331]

Where did we find this crew?!

'86 - '03 Ranger 1,100 lb spring 2 leaves + overload, 323lb/inch
'86 - '03 Ranger 1,250 lb spring 3 leaves + overload, 417lb/inch
'03 - '11 Ranger 1,110 lb spring 2 leaves + overload, 370lb/inch
'03 - '11 Ranger 1,250 lb spring 3 leaves + overload, 408lb/inch
'03 - '11 Ranger 1,350 lb spring 3 leaves + overload, 617lb/inch
Aftermarket 1,750 lb spring 4 leaves + overload, 636lb/inch

'91 - '01 Explorer 1,110 lb spring 3 leaves + overload, 338lb/inch
'91 - '01 Explorer 1,250 lb spring 3 leaves + overload, 519lb/inch

 

[superj]

i guess you have to look at the door sticker to see which 3 leaf pack you have to know if you are the 408 or the 617 numbers, on the 03-11 range

 

[Eddo Rogue]

I was shopping for leaf springs, and rock auto and one other site (I think james duff) actually provided specs like load rate, spring rate, #of leafs, and even free arch as well. I noticed some of the same load rate springs came in different size free archs. Hope his helps.

 

[BrownRangers]

Stock my truck is a 1984 Ranger S trim. What I am finding is 1050lb load rating. I have drop -1.5” shackles with 1250lb springs from a ranger edge which are +1”. I am going to be trying some Hyperco Composite 225lb spring rate 4.5” arch(-2” compared to ranger) springs @875lb load rating for road racing style track days. Won’t be putting anything in the truck bed for hauling except for what tools/wheels/spares/jacks are need for the track days and bikes.

Link:

Hyperco Coils 11344 Hyperco Composite Leaf Springs | Summit Racing

Free Shipping - Hyperco Composite Leaf Springs with qualifying orders of $109. Shop Racing Springs at Summit Racing.

www.summitracing.com

 

[Eddo Rogue]

I have 1050 lb springs. Hauling a dirt bike and its gear is no problem. It rides nice empty too. I once drove a drunk friend home back there, cab was full. He said it was the smoothest laying in the bed of a truck ride home he's ever had. I am happy with them.

 

[racsan]

I have the single-leaf fiberglass rear springs, which is odd since its a reg cab longbed. 320# of softner salt really squats it good. I have axle mounted coil helpers but took them off recently so my backroad morning commute wouldn’t be such a rough ride.

 

[Eddo Rogue]

I have the single-leaf fiberglass rear springs, which is odd since its a reg cab longbed. 320# of softner salt really squats it good. I have axle mounted coil helpers but took them off recently so my backroad morning commute wouldn’t be such a rough ride.
View attachment 80568

Nice, ever haul a drunk buddy home on those? looks smooth....

 

[superj]

until this thread, i didn't even know single leaf springs existed

 

[Ranger850]

until this thread, i didn't even know single leaf springs existed

I think they were available on the 2 door Explorer Sport models