I've redone this to make it easier to find a spring for the desire lift height. There's now a Trooper and Rodeo section. Each has 2 categories for zero load and 1000bs. I looked through the BDS catalogue to get some better springs and keep the rates within reason. Sorry there's not more for the Rodeo guys. I'm going to search around in some other catalogues for more springs. Also the BDS catalogue didn't list end type so look them up before blindly ordering.
There's seems to be some confusion about Progressive vrs Straight rate springs. In a nut shell straight rate springs only have one rate over the length of the spring. That makes them ideally suited for constant loads like say 1000lbs all the time. Progressive springs will have at least 2 rates but some aftermarket springs will have 3-5 rates. Progressive springs are best suited vehicles that see multiple load conditions. Like daily commuter without a load during the week and 1000lbs of gear on the weekend for adventures. Regardless of which spring you pick there will be a difference in height from unloaded to loaded. The real benefit of progressive springs is the softer ride when unloaded.
**According to the OME catalogue the OE Trooper spring rate is 160 lbs/in. Free length is 16".
TyCobb2001 provided the weight numbers for his Trooper:
92-02 Trooper curb weight 4460 lbs
Front axle(FA) 2150 lbs
Rear axle(RA) 2310 lbs
Neutron provided weight numbers for his 2000 Rodeo LSE
98+ Rodeo curb weight 4280
Front axle(FA) 2200 lbs
Rear axle((RA) 2080 lbs
Jerry(jlemond) provided axle and brake assembly weights:
12b axle weights (AW)
87-91 -- 160 lbs
92-94 -- 170 lbs
95-97 -- 180 lbs
98-02 -- 190 lbs
Brakes -- 20 lbs/side or 40 lbs total
D44 axle weight (AW)
Coil sprung -- 175 lbs (remember this is a rough number)
Brakes -- 20 lbs/side or 40 lbs total
Basic Load Equation
RA weight - (AW + Brakes) + Cargo + People = Load on RA
So using the numbers for my Trooper
- [ ] 2310 - (180 + 40) + 64 + 500 = 2654 lbs
The equation for this part is:
Load / (Spring Rate x 2) = Inches of sag
or
2654 / (158 x 2) = 8.398"
With a 2654 lbs load on the rear axle using the CC784 springs I would get 8.4" of sag. Now everyone every one wants to know how this number gives you the amount of lift. That's a little tougher since you need to subtract the Sag number from the free length of the coil to get the load height. Then figure everything out for stock. Once that's done you need to subtract your Lift Spring load height from your Stock load height. If the number comes out negative then the spring will LOWER your truck.
Stock would be:
2654 / (160 x 2) = 8.293" sag
Free length - Sag = Load Height
16" - 8.293" = 7.707"
CC784
2654 / 158 x 2 = 8.398"
18.6 - 8.398 = 10.202 Load Height
Overall lift is:
CC784 - Stock = Amount of Lift
10.202" - 7.707" = 2.495"
So with the same load a Moog CC784 will lift a Trooper 2.5" over a stock coil. Now I need everyone to remember that these numbers are estimates and will give you a good idea how much lift a given spring will provide. Unless you take the time to weigh everything yourself your REAL WORLD numbers will vary from the number you get here.
I've already done the math for each spring to determine the lift height. These are ESTIMATES and your real world numbers will be different. BE REALISTIC WITH THE LOAD YOU PLAN TO CARRY. Anything with a spring rate OVER 250lbs is going to ride like crap without a load. The chart reads as follows:
Brand--Part #--free length--spring rate--lift
Stock Trooper 92 thru 97--16"--160lbs/in
Stock Trooper 98 thru 04--180lbs/in
Stock Rodeo--14"--160lbs/in
Stock Trooper replacement
92-97 Trooper
Moog Cc217--16.15"--155lbs/in--variable rate***requires pig tail cut off
98-04 Trooper
BDS 034209--16"--180 lbs/in
Trooper Lift Springs with ZERO load
2-3" lift
Moog Cc812--16.3"--245lbs/in--variable rate--2.2"***requires pig tail cut off
Moog cc784--18.6"--158 lbs/in--lift 2.5"
BDS 034409--17.625"--200 lbs/in--lift 2.9"
3-4"
BDS 034211--17.25"--240 lbs/in--lift 3.5"
Moog 6187--17.5"--243lbs/in--lift 3.7"
BDS 034411--19.75"--175 lbs/in--lift 4.3"
4-5"
Moog cc814--17.5"--271 lbs/in--lift 4.2"
BDS 034301--18.5"--240 lbs/in--lift 4.7"
Moog cc816--18.25--271 lbs/in--lift 5"
BDS 034451--20.5"--175 lbs/in--lift 5"
BDS 034619--20.375"--180 lbs/in--lift 5"
5-6"
BDS 034658--19.625"--200 lbs/in--lift 5"
BDS 034452--20.13"--240 lbs/in--lift 6.3"
6-8"
BDS 034353--20.875"--240 lbs/in--lift 7"
BDS 034611--21.75"--175 lbs/in--lift 7"
BDS 034651--21.875"--225 lbs/in--lift 7.75"
8-10"
BDS 034652--21.75"--240 lbs/in--lift 8""
BDS 034653--22.875"--240 lbs/in--lift 9"
BDS 034852--23.75"--240 lbs/in--lift 10"
Trooper Lift Springs with 1000lbs load
0-2" lift
BDS 034409--17.625"--200 lbs/in--lift .5"
Moog Cc812--16.3"--245lbs/in--variable rate--.7"***requires pig tail cut off
BDS 034211--17.25"--240 lbs/in--lift 1.3"
BDS 034411--19.75"--175 lbs/in--lift 1.5"
2-3" lift
BDS 034451--20.5"--175 lbs/in--lift 2.2"
Moog cc814--17.5"--271 lbs/in--lift 2.3"
BDS 034619--20.375"--180 lbs/in--lift 2.3"
BDS 034301--18.5"--240 lbs/in--lift 2.5"
Moog 6187--17.5"--243lbs/in--lift 2.9"
Moog cc816--18.25--271 lbs/in--lift 3"
3-4"
BDS 034611--21.75"--175 lbs/in--lift 3.5"
4-5"
BDS 034452--20.13"--240 lbs/in--lift 4.25"
BDS 034658--19.625"--200 lbs/in--lift 5"
BDS 034353--20.875"--240 lbs/in--lift 5"
5-7"
BDS 034651--21.875"--225 lbs/in--lift 5.575"
BDS 034652--21.75"--240 lbs/in--lift 5.8"
BDS 034653--22.875"--240 lbs/in--lift 7"
BDS 034852--23.75"--240 lbs/in--lift 7.85"
Rodeo Lift Springs with ZERO load
0-2"
Moog Cc721-- 14.16--182 lbs/in--lift .85**requires pigtail cut off
Moog Cc217--16.15"--155lbs/in--variable rate--lift 2"--***requires pig tail cut off
BDS 034209--16"--180 lbs/in--lift 2.65"
2-4"
Moog Cc247--16.5"--161lbs/in--variable rate--lift 2.6"
BDS 034319--17"--180 lbs/in--lift 3.65"
4-5"
Moog Cc812--16.3"--245lbs/in--variable rate--lift 4.3"***requires pig tail cut off
Moog Cc784--18.6"--158lbs/in--variable rate--lift 4.5"***requires pig tail cut off
BDS 034419--18"--180 lbs/in--lift 4.65"
BDS 034208--15.63"--200 lbs/in--lift 4.75"
BDS 034311--18.875"--160 lbs/in--lift 4.875"
BDS 034202--18.375--180 lbs/in--lift 5"
5-6"
BDS 034211--17.25"--240 lbs/in--lift 5.2"
BDS 34302--19.5"--158 lbs/in--lift 5.4"
BDS 034411--19.75"--175 lbs/in--lift 6.25"
Rodeo Lift Springs with 1000lbs load
0-3"
BDS 034208--15.63"--200 lbs/in--lift .5"
BDS 034319--17"--180 lbs/in--lift 1"
BDS 034419--18"--180 lbs/in--lift 2"
Moog Cc812--16.3"--245lbs/in--variable rate--lift 2.3"***requires pig tail cut off
BDS 034202--18.375--180 lbs/in--lift 2.375"
3-4"
BDS 034211--17.25"--240 lbs/in--lift 3"
BDS 034411--19.75"--175 lbs/in--lift 3.5"
There's seems to be some confusion about Progressive vrs Straight rate springs. In a nut shell straight rate springs only have one rate over the length of the spring. That makes them ideally suited for constant loads like say 1000lbs all the time. Progressive springs will have at least 2 rates but some aftermarket springs will have 3-5 rates. Progressive springs are best suited vehicles that see multiple load conditions. Like daily commuter without a load during the week and 1000lbs of gear on the weekend for adventures. Regardless of which spring you pick there will be a difference in height from unloaded to loaded. The real benefit of progressive springs is the softer ride when unloaded.
**According to the OME catalogue the OE Trooper spring rate is 160 lbs/in. Free length is 16".
TyCobb2001 provided the weight numbers for his Trooper:
92-02 Trooper curb weight 4460 lbs
Front axle(FA) 2150 lbs
Rear axle(RA) 2310 lbs
Neutron provided weight numbers for his 2000 Rodeo LSE
98+ Rodeo curb weight 4280
Front axle(FA) 2200 lbs
Rear axle((RA) 2080 lbs
Jerry(jlemond) provided axle and brake assembly weights:
12b axle weights (AW)
87-91 -- 160 lbs
92-94 -- 170 lbs
95-97 -- 180 lbs
98-02 -- 190 lbs
Brakes -- 20 lbs/side or 40 lbs total
D44 axle weight (AW)
Coil sprung -- 175 lbs (remember this is a rough number)
Brakes -- 20 lbs/side or 40 lbs total
Basic Load Equation
RA weight - (AW + Brakes) + Cargo + People = Load on RA
So using the numbers for my Trooper
- [ ] 2310 - (180 + 40) + 64 + 500 = 2654 lbs
The equation for this part is:
Load / (Spring Rate x 2) = Inches of sag
or
2654 / (158 x 2) = 8.398"
With a 2654 lbs load on the rear axle using the CC784 springs I would get 8.4" of sag. Now everyone every one wants to know how this number gives you the amount of lift. That's a little tougher since you need to subtract the Sag number from the free length of the coil to get the load height. Then figure everything out for stock. Once that's done you need to subtract your Lift Spring load height from your Stock load height. If the number comes out negative then the spring will LOWER your truck.
Stock would be:
2654 / (160 x 2) = 8.293" sag
Free length - Sag = Load Height
16" - 8.293" = 7.707"
CC784
2654 / 158 x 2 = 8.398"
18.6 - 8.398 = 10.202 Load Height
Overall lift is:
CC784 - Stock = Amount of Lift
10.202" - 7.707" = 2.495"
So with the same load a Moog CC784 will lift a Trooper 2.5" over a stock coil. Now I need everyone to remember that these numbers are estimates and will give you a good idea how much lift a given spring will provide. Unless you take the time to weigh everything yourself your REAL WORLD numbers will vary from the number you get here.
I've already done the math for each spring to determine the lift height. These are ESTIMATES and your real world numbers will be different. BE REALISTIC WITH THE LOAD YOU PLAN TO CARRY. Anything with a spring rate OVER 250lbs is going to ride like crap without a load. The chart reads as follows:
Brand--Part #--free length--spring rate--lift
Stock Trooper 92 thru 97--16"--160lbs/in
Stock Trooper 98 thru 04--180lbs/in
Stock Rodeo--14"--160lbs/in
Stock Trooper replacement
92-97 Trooper
Moog Cc217--16.15"--155lbs/in--variable rate***requires pig tail cut off
98-04 Trooper
BDS 034209--16"--180 lbs/in
Trooper Lift Springs with ZERO load
2-3" lift
Moog Cc812--16.3"--245lbs/in--variable rate--2.2"***requires pig tail cut off
Moog cc784--18.6"--158 lbs/in--lift 2.5"
BDS 034409--17.625"--200 lbs/in--lift 2.9"
3-4"
BDS 034211--17.25"--240 lbs/in--lift 3.5"
Moog 6187--17.5"--243lbs/in--lift 3.7"
BDS 034411--19.75"--175 lbs/in--lift 4.3"
4-5"
Moog cc814--17.5"--271 lbs/in--lift 4.2"
BDS 034301--18.5"--240 lbs/in--lift 4.7"
Moog cc816--18.25--271 lbs/in--lift 5"
BDS 034451--20.5"--175 lbs/in--lift 5"
BDS 034619--20.375"--180 lbs/in--lift 5"
5-6"
BDS 034658--19.625"--200 lbs/in--lift 5"
BDS 034452--20.13"--240 lbs/in--lift 6.3"
6-8"
BDS 034353--20.875"--240 lbs/in--lift 7"
BDS 034611--21.75"--175 lbs/in--lift 7"
BDS 034651--21.875"--225 lbs/in--lift 7.75"
8-10"
BDS 034652--21.75"--240 lbs/in--lift 8""
BDS 034653--22.875"--240 lbs/in--lift 9"
BDS 034852--23.75"--240 lbs/in--lift 10"
Trooper Lift Springs with 1000lbs load
0-2" lift
BDS 034409--17.625"--200 lbs/in--lift .5"
Moog Cc812--16.3"--245lbs/in--variable rate--.7"***requires pig tail cut off
BDS 034211--17.25"--240 lbs/in--lift 1.3"
BDS 034411--19.75"--175 lbs/in--lift 1.5"
2-3" lift
BDS 034451--20.5"--175 lbs/in--lift 2.2"
Moog cc814--17.5"--271 lbs/in--lift 2.3"
BDS 034619--20.375"--180 lbs/in--lift 2.3"
BDS 034301--18.5"--240 lbs/in--lift 2.5"
Moog 6187--17.5"--243lbs/in--lift 2.9"
Moog cc816--18.25--271 lbs/in--lift 3"
3-4"
BDS 034611--21.75"--175 lbs/in--lift 3.5"
4-5"
BDS 034452--20.13"--240 lbs/in--lift 4.25"
BDS 034658--19.625"--200 lbs/in--lift 5"
BDS 034353--20.875"--240 lbs/in--lift 5"
5-7"
BDS 034651--21.875"--225 lbs/in--lift 5.575"
BDS 034652--21.75"--240 lbs/in--lift 5.8"
BDS 034653--22.875"--240 lbs/in--lift 7"
BDS 034852--23.75"--240 lbs/in--lift 7.85"
Rodeo Lift Springs with ZERO load
0-2"
Moog Cc721-- 14.16--182 lbs/in--lift .85**requires pigtail cut off
Moog Cc217--16.15"--155lbs/in--variable rate--lift 2"--***requires pig tail cut off
BDS 034209--16"--180 lbs/in--lift 2.65"
2-4"
Moog Cc247--16.5"--161lbs/in--variable rate--lift 2.6"
BDS 034319--17"--180 lbs/in--lift 3.65"
4-5"
Moog Cc812--16.3"--245lbs/in--variable rate--lift 4.3"***requires pig tail cut off
Moog Cc784--18.6"--158lbs/in--variable rate--lift 4.5"***requires pig tail cut off
BDS 034419--18"--180 lbs/in--lift 4.65"
BDS 034208--15.63"--200 lbs/in--lift 4.75"
BDS 034311--18.875"--160 lbs/in--lift 4.875"
BDS 034202--18.375--180 lbs/in--lift 5"
5-6"
BDS 034211--17.25"--240 lbs/in--lift 5.2"
BDS 34302--19.5"--158 lbs/in--lift 5.4"
BDS 034411--19.75"--175 lbs/in--lift 6.25"
Rodeo Lift Springs with 1000lbs load
0-3"
BDS 034208--15.63"--200 lbs/in--lift .5"
BDS 034319--17"--180 lbs/in--lift 1"
BDS 034419--18"--180 lbs/in--lift 2"
Moog Cc812--16.3"--245lbs/in--variable rate--lift 2.3"***requires pig tail cut off
BDS 034202--18.375--180 lbs/in--lift 2.375"
3-4"
BDS 034211--17.25"--240 lbs/in--lift 3"
BDS 034411--19.75"--175 lbs/in--lift 3.5"