• Welcome Visitor! Please take a few seconds and Register for our forum. Even if you don't want to post, you can still 'Like' and react to posts.

Spring rate vs Load rating?

BrownRangers

Member
Joined
Aug 20, 2019
Messages
60
Reaction score
41
Points
18
Location
Burbank, CA
Vehicle Year
1984
Make / Model
Ford Ranger
Engine Type
2.8 V6
Engine Size
171cui
Transmission
Manual
2WD / 4WD
2WD
Total Drop
3"
Tire Size
245/40/15
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

Active Member
Joined
Aug 1, 2016
Messages
572
Reaction score
166
Points
43
Location
Oshawa, Ontario
Vehicle Year
1998
Make / Model
Ford
Engine Type
3.0 V6
Engine Size
3.0L
Transmission
Automatic
2WD / 4WD
2WD
Total Lift
-
Total Drop
mild
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

Well-Known Member
Supporting Member
U.S. Military - Veteran
Joined
Oct 5, 2007
Messages
3,970
Reaction score
1,442
Points
113
Location
Toledo Ohio
Vehicle Year
20002005199
Make / Model
Fords
Engine Size
3.0 2.3
My credo
get outta my way, I'm falling!
"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 :icon_thumby:
 

don4331

Well-Known Member
V8 Engine Swap
Joined
Sep 6, 2013
Messages
1,535
Reaction score
686
Points
113
Location
Calgary, AB
Vehicle Year
1999
Make / Model
Ford
Engine Type
V8
Engine Size
5.3
Transmission
Automatic
Where did we find this crew?! :LOL:

'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

Well-Known Member
U.S. Military - Veteran
Joined
Oct 1, 2021
Messages
1,256
Reaction score
860
Points
113
Location
corpus christi, texas
Vehicle Year
2004
Make / Model
ranger edge
Engine Type
3.0 V6
Engine Size
V6 of power
Transmission
Manual
2WD / 4WD
2WD
Total Lift
none
Total Drop
none
Tire Size
235s
My credo
Grew up in the 70s, 80s, and 90s
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
 
Last edited:

Eddo Rogue

Well-Known Member
Joined
May 18, 2020
Messages
2,869
Reaction score
1,367
Points
113
Location
Burbank,CA
Vehicle Year
1993
Make / Model
Ranger 4x4
Engine Type
4.0 V6
Engine Size
OHV
Transmission
Manual
2WD / 4WD
4WD
Total Lift
skyjacker front leveling kit
Tire Size
31-10.50R15
My credo
Crossed threads are tight threads.
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

Member
Joined
Aug 20, 2019
Messages
60
Reaction score
41
Points
18
Location
Burbank, CA
Vehicle Year
1984
Make / Model
Ford Ranger
Engine Type
2.8 V6
Engine Size
171cui
Transmission
Manual
2WD / 4WD
2WD
Total Drop
3"
Tire Size
245/40/15
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:
 
Last edited:

Eddo Rogue

Well-Known Member
Joined
May 18, 2020
Messages
2,869
Reaction score
1,367
Points
113
Location
Burbank,CA
Vehicle Year
1993
Make / Model
Ranger 4x4
Engine Type
4.0 V6
Engine Size
OHV
Transmission
Manual
2WD / 4WD
4WD
Total Lift
skyjacker front leveling kit
Tire Size
31-10.50R15
My credo
Crossed threads are tight threads.
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

Well-Known Member
Supporting Member
TRS 20th Anniversary
TRS Event Participant
Joined
Aug 17, 2007
Messages
4,148
Reaction score
2,886
Points
113
Location
central ohio
Vehicle Year
1994
Make / Model
ford
Engine Type
2.3 (4 Cylinder)
Engine Size
2.3/140-4
Transmission
Manual
2WD / 4WD
2WD
Tire Size
225/70/15-winter. 235/75/15-summer
My credo
built, not bought
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.
8636EFA5-7362-4E70-B77D-F60A59CAF8BD.jpeg
 

Eddo Rogue

Well-Known Member
Joined
May 18, 2020
Messages
2,869
Reaction score
1,367
Points
113
Location
Burbank,CA
Vehicle Year
1993
Make / Model
Ranger 4x4
Engine Type
4.0 V6
Engine Size
OHV
Transmission
Manual
2WD / 4WD
4WD
Total Lift
skyjacker front leveling kit
Tire Size
31-10.50R15
My credo
Crossed threads are tight threads.
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

Well-Known Member
U.S. Military - Veteran
Joined
Oct 1, 2021
Messages
1,256
Reaction score
860
Points
113
Location
corpus christi, texas
Vehicle Year
2004
Make / Model
ranger edge
Engine Type
3.0 V6
Engine Size
V6 of power
Transmission
Manual
2WD / 4WD
2WD
Total Lift
none
Total Drop
none
Tire Size
235s
My credo
Grew up in the 70s, 80s, and 90s
until this thread, i didn't even know single leaf springs existed
 

Ranger850

Banned... except Florida... and here soon
Supporting Member
TRS 20th Anniversary
Joined
Jan 24, 2018
Messages
7,360
Reaction score
3,675
Points
113
Location
Tallahassee Florida
Vehicle Year
2001
Make / Model
Ford
Engine Size
Born with a 3.0, looking for a donor V8
Transmission
Manual
2WD / 4WD
2WD
Total Lift
Stock 2"
Tire Size
Stock
My credo
Doing things wrong, until I get it right.
until this thread, i didn't even know single leaf springs existed
I think they were available on the 2 door Explorer Sport models
 

Sponsored Ad


Sponsored Ad

Top