Pro Comp Spring Specifications

Below are the lift spring specifications from the 2000 Pro Comp catalog. Interesting enough, they do not include the center pin location for their springs - so you are on your own there.

All measurements are in Inches and the "Rate" of the spring is measured in pounds per square inch.

Below this chart I plan to (soon!) included a few vehicles and what part # spring they call for. You may be able to compare this to the Rancho spring application and get a general idea where the center pin location is.

I do know that YJ lift springs (51313, 51323) have a center pin located exact center of the pack.

Part #	Flat Length	Free Length	Camber Free	Front Eyelett i.d.	Rear Eyelett i.d.	Leaf Width	# of Leaves	Spring Rate
11211	47.00	45.75	3.93	1.50	1.12	2.50	5	526
11411	47.00	45.62	4.52	1.50	1.12	2.50	5	550
11511	47.62	45.62	6.69	1.50	1.12	2.50	6	589
31211L	45.88	42.50	7.08	1.17	1.17	2.36	3	340
31212R	45.88	42.75	6.57	1.17	1.17	2.36	3	340
31221L	45.50	43.25	5.62	1.17	1.17	2.36	3	301
31222R	45.50	43.50	5.00	1.17	1.17	2.36	3	301
31252	44.30	41.62	6.40	1.37	1.37	2.75	6	385
31253	44.87	41.25	7.91	1.38	1.38	2.75	5	360
51212	45.00	42.50	6.37	1.50	1.00	2.00	5	274
51213	40.62	38.12	6.06	0.87	0.87	1.77	6	304
51222	45.62	43.00	6.50	1.50	1.00	2.50	5	293
51223	46.75	43.25	6.92	0.87	0.87	1.77	6	290
51313	46.00	41.37	8.56	1.50	1.50	2.50	4	195
51323	45.87	42.37	7.40	1.50	1.50	2.50	4	188
51412	45.12	41.00	8.60	1.00	1.50	2.00	5	245
51413	46.00	42.10	7.97	1.50	1.50	2.50	5	287
51422	46.19	42.25	8.47	1.50	1.00	2.50	5	330
51423	45.87	42.12	7.90	1.50	1.50	2.50	4	228