TGC 3/4" Spacer ?

I just want to make sure I have this correct....I have a 3/4 poly TGC spacer that I am looking to install today. This is placed on top of the factory and isolator....correct?? I haven't actually taken this trucks rear apart before so I don't know for certain. The spacer almost looks like it fits directly over the "hump" the bottom of the spring rests on but I was under the impression it went on top.

TGC 3/4" Spacer ?

It goes above the spring and isolator. Correct


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I thought the poly’s go below the spring and sit on the axle. The steel ones go above the spring.

Huh didn't know some went on top and some bottom. My Maxx Suspensions spacer went on the bottom, with that one you also drill a hole and tap it so that you can bolt it down so that it doesn't move or make noise.

Ravjay12 said:

I thought the poly’s go below the spring and sit on the axle. The steel ones go above the spring.

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Thats what I was starting to question..... It looks like its meant to go on the bottom the more that I look at it. But I was pretty sure it was suppose to go up top at first. Does it hold the spring in place well enough though?? I feel like the spring could slide off the poly

Top Gun has nothing on their site for these either so I am really starting to wonder. Maybe I should give them a call

My 1” metal went on top. I’d say call them to be safe.


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Called TGC. They said that poly go on bottom and steel go on top. Glad I asked. I was gonna do top.

Frosty415 said:

Thats what I was starting to question..... It looks like its meant to go on the bottom the more that I look at it. But I was pretty sure it was suppose to go up top at first. Does it hold the spring in place well enough though?? I feel like the spring could slide off the poly

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The poly shouldn’t slip at all. The weight of the truck should keep it in place.

I'm curious as to how far the poly spacer sits inside the rear coil spring.

Funny, I took the poly one off installed by the previous owner and it was on the top. It was a TGC one also..

WiSH2oo0 said:

I'm curious as to how far the poly spacer sits inside the rear coil spring.

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It doesn't seem very far. I managed to force the spring to slide over the top of the spacer because I was having a hard time getting the driver side back on. But once i got everything put back together and on the ground I crawled under and tried pushing/pulling the springs and they weren't moving.

RandyGallup said:

Funny, I took the poly one off installed by the previous owner and it was on the top. It was a TGC one also..

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Why take it off though??? Haha. Honestly it probably could go on top without issue after looking it over.

Frosty - how was the install?

adboyd06 said:

Frosty - how was the install?

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Install went pretty smooth overall. Took about 1 hr. My lower shock bolt and sway bar link bolt took some muscle to get the nuts off. I opted to use my impact but could've done it without. Made sure to remove the brake line hangers on both sides just to make sure I had enough slack to lower the differential. The only "issue" I ran into was that I put the passenger side coil and spacer in first and once I went to do the driver side, I couldn't get the coil back in place. I had my jack stands maxed out and the jack holding the differential up was all the way down and it was still too tight. So I tried pulling the passenger side coil back out and that gave me just enough room to push down on the driver side hub and get it in place. Then I went back over to the passenger side and put that one back in. It was tougher once the other side was in but It was doable unlike trying it with the passenger side in first. I have read somewhere that the driver side coils are a little bigger to compensate for gas tank and driver weight. Once they were back in place I jacked the rear back up and reconnected everything. Done deal. I guess if I had any tips it would be get the driver side in first and if you have the option, maybe put blocks under your jack stands to get the body up higher so you have more space between the axle and body.

Being I had aftermarket shocks that are slightly longer than stock I took nothing apart. I just zipped a couple coils spring compressers on one spring . Jacked up the frame ahead of the lower control arm mounts on the frame . Picked up the spring by hand and dropped the TGC 3/4" poly spacer in . Did both sides in less than a half hour

Gary2 said:

Being I had aftermarket shocks that are slightly longer than stock I took nothing apart. I just zipped a couple coils spring compressers on one spring . Jacked up the frame ahead of the lower control arm mounts on the frame . Picked up the spring by hand and dropped the TGC 3/4" poly spacer in . Did both sides in less than a half hour

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If I had spring compressors this is what I woyodce done. Should've just rented some. Either way, it's all done.

they are cheap and very handy to have

did you buy the spacer from TGC?....they want $25 to ship them to Houston

Frosty415 said:

Why take it off though??? Haha. Honestly it probably could go on top without issue after looking it over.

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Truck sat to high in the rear. Previous owner did a leveling kit then the rear spacers. So it looked like factory rake, just taller lol!