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Discussion Starter #1
Finally got around to putting in the rear Eibach sport shocks I had as well as lift blocks for the rear. Killed two birds and figured I would write it up for anyone who is interested.

It's a fairly easy job. Took me an hour total for both sides, you could certainly do it in less.

What you'll need:
23mm socket for lug nuts
21mm socket for all the bolts
Wrench to fit said sockets
21mm wrench or another socket
Jack
Jack stands or lift or something
Gloves, or not, your choice
Saftey glasses
Parts

So I had ordered the Eibach shocks all together in Dec on sale and rebate. The front have been excellent so was looking forward to the rear matching. So far they ride very nice, better than stock imo.
For the blocks and u-bolts, I took advice from @ssgjurista and ordered GM parts that are commonly sold as take-offs from FS. Part numbers: 15885530 and 11569811
Which I have an extra set of the blocks if anyone wants to buy (pm me)


*note* This only the way I did everything. I am by no means a certified mechanic or authority. Wrench at your own risk and what you're comfortable with. I take no responsibility in your actions.







Step 1: Chock the front wheels and jack up the rear, rest the frame high enough on some jack stands or if you have a lift, even better.



Step 2: Use a jack under the diff to position axle as needed. To start, raise the jack so it's just barely carrying load. (should use a piece of wood or something instead of jacking directly on the diff)



Step 3: Remove the lower bolt on the shock. 21mm nut and bolt.



Step 4: Repeat on other side

Step 5: Remove u-bolt nuts on one side and loosen on other. 21mm nuts




Step 6: Take off axle seat (not sure what you call it) and lower jack slowly to lower the axle enough to slip the block under the springs. May need to jostle a little to free things up



Step 7: Replace u-bolts with longer set and put axle seat back on and tighten nuts, not fully yet

Step 8: Repeat for other side

Step 9: Remove top bolt for shocks. 21mm bolt



Step 10: Swap shocks and tighten the top bolts

Step 11: Use the jack to move the axle as needed to align the bottom bolts and tighten back up



Step 12: Torque everything back up!



Step 13: Put the wheels back on, lower the truck slowly and torque the lugs

Step 14: Clean up and enjoy your new ride!


Here are some extra pics. Definitely nice to have a nice warm garage with a lift and air tools...





 

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Nice write up. Truck looks good, as well as the garage.
What you use on them thar splatter targets?
 

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Always helps to have a warm dry garage and air tools.

Did you do the final torque with the impact or a torque wrench and torque angle gauge?

BTW: those lift blocks look familiar. LOL
 

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Good writeup!

This might be answered already, but since they are GM OEM parts, are the blocks you used for your extra lift intended for a Z71?
 

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Discussion Starter #5
Nice write up. Truck looks good, as well as the garage.
What you use on them thar splatter targets?
Thank you.
Got them to help sight scopes on a break barrel air rifle and an old .22
Shot a .45 the other day at one, didn't last very long haha

Always helps to have a warm dry garage and air tools.

Did you do the final torque with the impact or a torque wrench and torque angle gauge?

BTW: those lift blocks look familiar. LOL
Oh definitely, specially in New England. It's my parents house, they down sized a couple years back and my dad wanted a dream garage. I'm very appreciative to use it, only live about an hour away. Help him whenever he needs to do any work on our family's cars.

I torqued with a torque wrench. 120ft-lbs on the u-bolts was a pain in the butt


Good writeup!

This might be answered already, but since they are GM OEM parts, are the blocks you used for your extra lift intended for a Z71?
You should be able to use them on any of the twins I would assume.
I couldn't tell you exactly which model FS the come off but they fit very nice on the Colorado. I have to give credit to @ssgjurista for giving the part numbers.
 

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Thank you.

Got them to help sight scopes on a break barrel air rifle and an old .22

Shot a .45 the other day at one, didn't last very long haha







Oh definitely, specially in New England. It's my parents house, they down sized a couple years back and my dad wanted a dream garage. I'm very appreciative to use it, only live about an hour away. Help him whenever he needs to do any work on our family's cars.



I torqued with a torque wrench. 120ft-lbs on the u-bolts was a pain in the butt









You should be able to use them on any of the twins I would assume.

I couldn't tell you exactly which model FS the come off but they fit very nice on the Colorado. I have to give credit to @ssgjurista for giving the part numbers.


When I looked up the part at the dealer there were a few vehicles and one of them was a Tahoe.

Another thank you to @ssgjurista


-mac
 

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Thanks for the kind words! The lift blocks are used on the 1500 Silverado/Sierra. Based on measurements (and being the guinea pig), I correctly guessed they would work on the Twins.
 

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What is the main reason / benefit for switching to the Eibach shocks? I can't imagine your OE shocks already wore out.

Nice write up!


Sent from my iPhone using Tapatalk
 

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Discussion Starter #10
What is the main reason / benefit for switching to the Eibach shocks? I can't imagine your OE shocks already wore out.

Nice write up!


Sent from my iPhone using Tapatalk
I got them together with the front on sale and with a rebate. Wanted a little nicer ride which they seem to offer.
 

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What is the main reason / benefit for switching to the Eibach shocks? I can't imagine your OE shocks already wore out.

Nice write up!


Sent from my iPhone using Tapatalk
Better ride and handling.
 

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Stupid question-- is there 1 or 2 spacers included in part #15885530? I know you have to order 2 sets of the u bolts, and I assumed you also have to order 2x the spacers, but several sites are showing "Qty needed per vehicle- 1" for the spacers. Thanks
 

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Stupid question-- is there 1 or 2 spacers included in part #15885530? I know you have to order 2 sets of the u bolts, and I assumed you also have to order 2x the spacers, but several sites are showing "Qty needed per vehicle- 1" for the spacers. Thanks
Bumping this up because I too have this stupid question (which makes it NOT stupid if two of us have it:))...I just ordered my Eibach's and want these in route as well but don't want to end up with 4 blocks. Thanks!
 

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Bumping this up because I too have this stupid question (which makes it NOT stupid if two of us have it:))...I just ordered my Eibach's and want these in route as well but don't want to end up with 4 blocks. Thanks!
@AtomicTree, HA, i just got my parts in the mail so I can confirm. You have to order 2 of each part number. The spacers are individual (even though everything seems to say 1 required per vehicle). The u-bolts are 2 packs, and 2 required for each side.

Ebay had the best prices as of last week.
 

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@AtomicTree, HA, i just got my parts in the mail so I can confirm. You have to order 2 of each part number. The spacers are individual (even though everything seems to say 1 required per vehicle). The u-bolts are 2 packs, and 2 required for each side.

Ebay had the best prices as of last week.
Thanks for the quick reply! Now I can get these and my longer swaybar endlinks ordered and have them here at the same time. Good luck with your install!
 

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Thanks for the quick reply! Now I can get these and my longer swaybar endlinks ordered and have them here at the same time. Good luck with your install!
You bet. What endlinks are you ordering? You plan to set the eibachs at roughly 2" lift?

I have a 2" RC on the front and didn't change the endlinks. I've got a popping coming from the front suspension on some turns/accel/decel. I'm thinking it's the sway bar but haven't been able to mess with it yet... likely going to grease the bar in the bushing and potentially look at longer end links because the angle is a bit steep.
 

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You bet. What endlinks are you ordering? You plan to set the eibachs at roughly 2" lift?

I have a 2" RC on the front and didn't change the end links. I've got a popping coming from the front suspension on some turns/accel/decel. I'm thinking it's the sway bar but haven't been able to mess with it yet... likely going to grease the bar in the bushing and potentially look at longer end links because the angle is a bit steep.
I bought the full Eibach Pro-Truck kit with springs and plan on leaving the shock on the lowest setting to get the 2"-ish lift.

I'm buying these end links only because another member said that's what he used lol: Front Sway Bar Endlinks. Prothane 19419 I can't find anyone else on here saying exactly what end links they bought and those aren't pricey at all. I'm not doing a sway bar relocation kit or a spacer though since I'm going to be putting on taller, not wider tires (255/70/17 Wildpeaks). But I guess if it looks tight, spacers are cheap and easy to swap in down the road.

I also will be building my own differential drop kit too using McMaster hardware BOLTS WASHERS
 

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By looking at the pictures of your rear leaf springs, I have come to the conclusion that they have put awful weak leaf springs on these trucks. The springs have no arch, maybe a negative arch when the truck Weight is on them. That is poor design by GM. They should be ashamed of themselves. If they would have put a decent set of springs on, you would not need the lift blocks. Have you been carrying a lot of weight or towing?
 

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I bought the full Eibach Pro-Truck kit with springs and plan on leaving the shock on the lowest setting to get the 2"-ish lift.

I'm buying these end links only because another member said that's what he used lol: Front Sway Bar Endlinks. Prothane 19419 I can't find anyone else on here saying exactly what end links they bought and those aren't pricey at all. I'm not doing a sway bar relocation kit or a spacer though since I'm going to be putting on taller, not wider tires (255/70/17 Wildpeaks). But I guess if it looks tight, spacers are cheap and easy to swap in down the road.

I also will be building my own differential drop kit too using McMaster hardware BOLTS WASHERS
Might have to look into those bolts and washers. Please report back when you do yours how it works out! I'm still atleast a month out before I can order my Eibach kit but was planning on getting the auto springs $40 kit but might take this route now.
 

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By looking at the pictures of your rear leaf springs, I have come to the conclusion that they have put awful weak leaf springs on these trucks. The springs have no arch, maybe a negative arch when the truck Weight is on them. That is poor design by GM. They should be ashamed of themselves. If they would have put a decent set of springs on, you would not need the lift blocks. Have you been carrying a lot of weight or towing?
Or is it a good design because it provides decent payload (1,560lbs) and a decent ride? Personally I don't like the way 3/4 ton trucks or add-a-leaf trucks ride.
 
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