Will a 2.5" rear block/ubolt app for 73-91 work for a 71? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

redz 1970 K5 · 01-07-2005, 07:54 PM

So I have had rear Rough Country 2" blocks on order through Jc Whitney for over a month, and now they are telling me it will take 60+ days to deliver.

I called Rough Country, and they have plenty in inventory! They are not allocating any to JC Whitney for whatever reason, and the rep was being a d$ck.

So, strike 1 and 2 against JCW and RC.

I called Explorer Pro Comp, and they have a 2.5" block/ubolt kit for 73-91 Blazers, but neither one of us could figure out why it wouldn't work on a 71... Maybe leaf spring thickness?

Any ideas?

bouncytruck · 01-08-2005, 01:19 PM

As far as I know, the only difference between the springs in the later years is the length. Also, the perches are in a different location on the axel, but other than that, I thought they were basically the same. Ya might post this question in the garage on CK5.com or on Pirate4x4.com. Also try calling a 4x4 shop. The manufacture probably can't recommend putting it on a vehicle that it isn't spec'd for, but the shops would probably know if it will work and would be more willing to tell you (especially if you make it sound like you might have them install it.)

muddbugg72 · 01-09-2005, 08:35 PM

i had a 4" lift on my 90 blazer and took it off and put it on my 72. it is an all spring kit from rough country. the U bolts worked fine. yeah i did have to relocate my front spring hangers.

01-07-2005, 07:54 PM	#1
redz 1970 K5 OBS guy Join Date: Jun 2004 Location: SoCal Posts: 1,060	Will a 2.5" rear block/ubolt app for 73-91 work for a 71? So I have had rear Rough Country 2" blocks on order through Jc Whitney for over a month, and now they are telling me it will take 60+ days to deliver. I called Rough Country, and they have plenty in inventory! They are not allocating any to JC Whitney for whatever reason, and the rep was being a d$ck. So, strike 1 and 2 against JCW and RC. I called Explorer Pro Comp, and they have a 2.5" block/ubolt kit for 73-91 Blazers, but neither one of us could figure out why it wouldn't work on a 71... Maybe leaf spring thickness? Any ideas? __________________ 88 Suburban Goodies- Alpine, Auto Meter, BDS, Bilstein, B&M, BFG, Borgeson, Bushwhacker, Cowl hood, Flowmaster, Genuine Gear, Holley, Infinity, JVC, K&N, MB Wheels, MSD, Pioneer, Skyjacker, Sony, Thorley, Walker + more

01-08-2005, 01:19 PM	#2
bouncytruck SKINNY TIRES RULE! Join Date: Sep 2001 Location: Bothell, WA Posts: 11,038	As far as I know, the only difference between the springs in the later years is the length. Also, the perches are in a different location on the axel, but other than that, I thought they were basically the same. Ya might post this question in the garage on CK5.com or on Pirate4x4.com. Also try calling a 4x4 shop. The manufacture probably can't recommend putting it on a vehicle that it isn't spec'd for, but the shops would probably know if it will work and would be more willing to tell you (especially if you make it sound like you might have them install it.) __________________ bouncytruck 1972 K5 The Hauler 1994 K1500 Suburban The Daily2010 Kia Soul Wife's Ride2014 Fiat 500L

01-09-2005, 08:35 PM	#3
muddbugg72 Registered User Join Date: Sep 2003 Location: port allen louisiana Posts: 207	i had a 4" lift on my 90 blazer and took it off and put it on my 72. it is an all spring kit from rough country. the U bolts worked fine. yeah i did have to relocate my front spring hangers.



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