Regarding rear shock absorbers

[RYO5566]

Hello!


I have a question about the rear shock absorber.


I bought the KYB KG5512 to replace the shock absorber, but the mounting holes don't fit.
Even when I remove the shock absorber and take the car off the lift and put it on the ground, the mounting holes don't reach the body.
I don't have a photo of the shock absorber removed, but the total length of the shock absorber is about 24.4 inches, and the mounting position on the body side is about 25 inches when the body is on the ground.
The rear height was raised about 1 to 2 inches by the previous owner changing the leaf spring, and the shock absorbers seem to be the ones for the original height.
So I'm looking for a shock absorber that fits this height.
There are Monroe Max Air Shocks, but I don't want to add extra parts like lung liver, so if possible, it would be helpful if they were adjustable.


I found a shock absorber like this at Summit, but it's not long enough.

 

[Ricks72Chlgr440]

Any time you raise the rear it is possible to have the shocks not fit, as you're finding out. Years ago we used shock extensions (like Mr Gasket 1288), but those are no longer available. You likely will need to order different rear shocks that are longer. Some folks have said that the old Imperial shocks were longer but you'll need to find out how long they are when fully retracted to ensure you have enough rebound travel when going over bumps.

 

[Xcudame]

Imperial shocks are 24.5" extended and have about 8.5" of travel. Might be too short for you! Maybe a 70's truck rear shock as they are 25.2" extended and have 10.4" travel?

 

[moparleo]

You are going to need to measure the compressed length and the extended length to calculate the correct shock for the new application.
So9 car suspension bottomed out and extended with shocks disconnected.

 

[RYO5566]

Any time you raise the rear it is possible to have the shocks not fit, as you're finding out. Years ago we used shock extensions (like Mr Gasket 1288), but those are no longer available. You likely will need to order different rear shocks that are longer. Some folks have said that the old Imperial shocks were longer but you'll need to find out how long they are when fully retracted to ensure you have enough rebound travel when going over bumps.

Hello!
Thank you for your kind information!
So there are such things as shock absorber extensions.
If they exist, my current brand new shock absorbers wouldn't go to waste, but after looking around, it seems there aren't any for Mopar.
If you have any other information, I'd appreciate it.

 

[RYO5566]

Imperial shocks are 24.5" extended and have about 8.5" of travel. Might be too short for you! Maybe a 70's truck rear shock as they are 25.2" extended and have 10.4" travel?

Hello!
Thank you for your kind information!
Even if I search for the 70 Challenger on Summit Racing, there aren't many types of rear shock absorbers.
Do you fit Challengers for trucks as well?

 

[RYO5566]

You are going to need to measure the compressed length and the extended length to calculate the correct shock for the new application.
So9 car suspension bottomed out and extended with shocks disconnected.

Hello!
Thank you for your kind information!
Currently, the shock absorber is not long enough, so it is attached to the vehicle in a stretched state, which puts strain on the leaf spring!

 

[Xcudame]

My Challenger is stock ride height so Blistiens and QA1s fit just fine! Since your 2 to 3 inches higher in the rear than stock, you're going to need a truck shock. Maybe something like a KYB 344070.

1974 DODGE D200 PICKUP 7.2L 440cid V8 Shock / Strut | RockAuto

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[moparleo]

Dimensions – KYB Americas

 

[6PKRTSE]

I needed the opposite. I needed shorter shocks because mine bottomed out because I have-1" split mono leafs and 1" lowering block welded in on my car to keep the ride height where I like it due to running 30" tall tires. I don't like the jacked up look.

 

[moparleo]

Correct option would be to put the car back to the correct height and not worry about having to make something fit that shouldn't be there.

 

[Challenger RTA]

Here is a set click here. MOPAR MR GASKET 1288 new REAR SHOCK EXTENSIONS some 60s 70s DODGE PLYMOUTH | eBay

 

[RYO5566]

Dimensions – KYB Americas

Hello!
Thanks for the information!
I couldn't find it on the KYB website in Japan, so this is very helpful!
There seem to be a few that might fit!

 

[RYO5566]

My Challenger is stock ride height so Blistiens and QA1s fit just fine! Since your 2 to 3 inches higher in the rear than stock, you're going to need a truck shock. Maybe something like a KYB 344070.

http://[URL]https://www.rockauto.co...0cid+v8,1085251,suspension,shock+/+strut,7556

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Hello!
Thank you for your advice!
It seems like this shock absorber is long enough!
After doing some research, I found that KG5413 also seems to be a suitable part number!

 

[RYO5566]

I needed the opposite. I needed shorter shocks because mine bottomed out because I have-1" split mono leafs and 1" lowering block welded in on my car to keep the ride height where I like it due to running 30" tall tires. I don't like the jacked up look.

I needed the opposite. I needed shorter shocks because mine bottomed out because I have-1" split mono leafs and 1" lowering block welded in on my car to keep the ride height where I like it due to running 30" tall tires. I don't like the jacked up look.

Hello!
Thank you for your comment.
My car has the rear raised, but I also like low-riding cars!
A Challenger I know had its ride height lowered with air suspension!

 

[RYO5566]

I needed the opposite. I needed shorter shocks because mine bottomed out because I have-1" split mono leafs and 1" lowering block welded in on my car to keep the ride height where I like it due to running 30" tall tires. I don't like the jacked up look.

I needed the opposite. I needed shorter shocks because mine bottomed out because I have-1" split mono leafs and 1" lowering block welded in on my car to keep the ride height where I like it due to running 30" tall tires. I don't like the jacked up look.

Correct option would be to put the car back to the correct height and not worry about having to make something fit that shouldn't be there.

Correct option would be to put the car back to the correct height and not worry about having to make something fit that shouldn't be there.

Hello!
Thank you for your comment.
I'll take a look at it!

 

[RYO5566]

I needed the opposite. I needed shorter shocks because mine bottomed out because I have-1" split mono leafs and 1" lowering block welded in on my car to keep the ride height where I like it due to running 30" tall tires. I don't like the jacked up look.

I needed the opposite. I needed shorter shocks because mine bottomed out because I have-1" split mono leafs and 1" lowering block welded in on my car to keep the ride height where I like it due to running 30" tall tires. I don't like the jacked up look.

Correct option would be to put the car back to the correct height and not worry about having to make something fit that shouldn't be there.

Here is a set click here. MOPAR MR GASKET 1288 new REAR SHOCK EXTENSIONS some 60s 70s DODGE PLYMOUTH | eBay
View attachment 128742View attachment 128743

Hello!
Thanks for the information!
I also looked at the Mr Gasket website, but it seems to be out of production.
Also, it seems to be produced by a different manufacturer, not just Mr Gasket.

MOPAR CHRYSLER DODGE SHOCK EXTENSIONS 1967 AND UP | eBay

 

[pschlosser]

In my experience, when jacking the car by the frame rails, and allowing the rear axle to drop fully while the tires are off the ground, in this condition, the axle has always, ALWAYS hung slightly from the shocks. In other words, the distance the rear axle drops when lifting by the frame rails is slightly longer than the correct shock absorber length. This is normal, or common, in my opinion.

 

[RYO5566]

In my experience, when jacking the car by the frame rails, and allowing the rear axle to drop fully while the tires are off the ground, in this condition, the axle has always, ALWAYS hung slightly from the shocks. In other words, the distance the rear axle drops when lifting by the frame rails is slightly longer than the correct shock absorber length. This is normal, or common, in my opinion.

Hello!
Thank you for your comment!
In my case, the rear was raised by the leaf spring, and even when it was on the ground, the length of the shock absorber was about 1/4 short.


So it feels like the rear is only supported by the force of the leaf spring!

 

[heminut]

So it feels like the rear is only supported by the force of the leaf spring!

Shock absorbers aren't meant to "support" anything, that's the spring's job. The shock absorber's job is to dampen spring oscillations and cushion the bumps in the road.