[twilightTA]

Originally Posted by gtospieg

The car will definitely handle better with the Del A Lum bushings because there is Zero deflection in that type of bushing, unlike the rubber bushings that allow quite a bit of deflection. I put the Global West control arms front and rear on my 67 GTO. Another added benefit is zero wheel hop.

Interesting, I was debating going with the del a lums in the rear springs especially since they can be greased a lot easier than my OEM style. I had heard some mentions in the past the the delrin could cause the leafs to bind, but not sure if that was accurate.

Have any of you bought the full shackle/bushing setup for the rear from Global West?

https://www.summitracing.com/parts/gls-108sh/reviews

[Formulabruce]

Originally Posted by twilightTA

Interesting, I was debating going with the del a lums in the rear springs especially since they can be greased a lot easier than my OEM style. I had heard some mentions in the past the the delrin could cause the leafs to bind, but not sure if that was accurate.

Have any of you bought the full shackle/bushing setup

Yes, I have a couple sets here ( F body )
On this 6 sided design, the blue Aluminum piece is Pressed into the spring, and another into the rear frame rail. GW sells a tool for the frame rail thats well worth it. Note in pics the amount of slots and groves for the grease to go.

[twilightTA]

Thanks JL. That’s what I had assumed from the spring rate reduction and increased articulation. I may need to leave things be after all. The PTFB springs do handle pretty great now - just a bit noisy and difficult to keep lubricated.

[HWYSTR455]

If you have a value of what the compressed length of the shock is, you can calculate max upward travel.


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[78w72]

Originally Posted by twilightTA

Thanks JL. That’s what I had assumed from the spring rate reduction and increased articulation. I may need to leave things be after all. The PTFB springs do handle pretty great now - just a bit noisy and difficult to keep lubricated.

Can you describe more what you mean by the PTFB springs being "noisy"? I have their full GT kit with the rear leafs & shackles and there is zero noise or squeaking from them.

I recall Dave telling me to use a mix of rubber & poly bushings at the rear shackle, will have to check to be sure which is where but he said use the rubber at the top position or maybe it was the bottom for the springs & definitely to use rubber at the front eyelet location... he explained this was because the springs need to articulate and that poly prevented or limited that. So I have rubber at one position for the shackles & front eyelet.

On another car I used all poly up front & for all positions in the rear, after talking with Dave he suggested I switch the front eyelet to rubber & sent me a pair of rubber bushings to swap out there, I will get some moog rubber for the shackles eventually. But even with full poly on the rear leafs of that car they are silent after 15+ years... but the fronts do squeak a little but cant hear it when driving, just a slight squeak when bouncing the front by hand, a little silicone spray stops that for the most part each season, but eventually for that car thats 99% street driven I will just go back to rubber. The dela lum or delrin bushings look interesting for the car with PTFB suspension though.

[twilightTA]

Originally Posted by 78w72

Can you describe more what you mean by the PTFB springs being "noisy"? I have their full GT kit with the rear leafs & shackles and there is zero noise or squeaking from them.

I recall Dave telling me to use a mix of rubber & poly bushings at the rear shackle, will have to check to be sure which is where but he said use the rubber at the top position or maybe it was the bottom for the springs & definitely to use rubber at the front eyelet location... he explained this was because the springs need to articulate and that poly prevented or limited that. So I have rubber at one position for the shackles & front eyelet.

On another car I used all poly up front & for all positions in the rear, after talking with Dave he suggested I switch the front eyelet to rubber & sent me a pair of rubber bushings to swap out there, I will get some moog rubber for the shackles eventually. But even with full poly on the rear leafs of that car they are silent after 15+ years... but the fronts do squeak a little but cant hear it when driving, just a slight squeak when bouncing the front by hand, a little silicone spray stops that for the most part each season, but eventually for that car thats 99% street driven I will just go back to rubber. The dela lum or delrin bushings look interesting for the car with PTFB suspension though.

It was making some creaking noises. I lubed up the leaf spring shackle and rear sway bar bushings a couple months back, and sprayed between the leafs as best I could. Getting the shackle out to lube the bushings was quite an effort next to the gas tank so it would be nice to not have to go thru that process again.

It was a bit impossible to get into the front leaf bushing so just sprayed that as well. It hadn’t really been gone thru like this since I installed the full GT kit back in 2015, and it’s possible it was installed poorly by the shop that put it in at the time.

I decided to do some focused testing on it this morning - pushing it up and down and going in and out of my driveway and it is pretty quiet front and rear right now.

You’re right that Dave at PTFB was super adamant to go with rubber or a spherical bushing in the front leaf spring eye. I forgot to check what material the bushings in the rear of the GT springs were when I lubed them.