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Rear Subframe and Differential Bushing Question

Hello, Going through a nightmare solid diff bushing install. I got the bushing (one on the subframe) in about 80% and couldn't get it in anymore. Fed up, I removed

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Old 09-05-2020, 09:54 PM   #1 (permalink)
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Default Rear Subframe and Differential Bushing Question

Hello,

Going through a nightmare solid diff bushing install. I got the bushing (one on the subframe) in about 80% and couldn't get it in anymore. Fed up, I removed the entire rear subframe and took it to a place with a 20 ton press and we were able to get it in about 95% of the way? At which point their press wasn't strong enough anymore. They recommended to go somewhere with a stronger press and everything is closed until the weekday.

Attached pics.

I guess my question is.. is the bushing, as it sits now, good enough for use? I was going to take it to one last shop when they're opened and if they can't do it I was going to have to remove it and I'll just go poly.

Also, is the rear subframe on the nismos the same as the non-nismos? When I was removing the subframe, asides from the damper (which came off separately), I didn't see anything special about it. Can anyone confirm?

EDIT: Did a parts search and it shows the same part # for the subframe on both the nismo and nonnismos .
Thanks all
Attached Images
File Type: jpg bushing1.JPG (21.4 KB, 34 views)
File Type: jpg bushing2.JPG (39.6 KB, 27 views)

Last edited by ihaveashihtzu; 09-05-2020 at 10:03 PM. Reason: more info
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Old 09-06-2020, 12:58 AM   #2 (permalink)
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Sub frames are the same.

Is that a SPL solid bushing?

From which direction did you install the bushing from? From the front, or from the rear?

Before installing the bushing. Did you make sure that there is NO burrs inside the hole. Use a flapper wheel inside the hole to smooth it out and remove the paint. Coat the inside of the hole with anti-seize. Have the bushing sit in the freezer for 24 hrs before install?

The hole is NOT perfectly round. When welding the sub-frame together. The welding distorted the hole.

You're almost there in the 2nd picture. A BF hammer might get you there. I've installed a couple of these. What you could do. Since you have the sub-frame out. Install the diff. What will be the telling point. Is how easy it is to thread the 2 front bolts into the sub-frame. If one of the bolts won't thread easy. Then you know that the bushing has to be moved. The first one I installed. I had to tap the bushing deeper into the hole to get both front bolts to thread. I had the front of the bushing flush with the hole.
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Old 09-06-2020, 05:04 AM   #3 (permalink)
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Quote:
Originally Posted by Rusty View Post
Sub frames are the same.

Is that a SPL solid bushing?

From which direction did you install the bushing from? From the front, or from the rear?

Before installing the bushing. Did you make sure that there is NO burrs inside the hole. Use a flapper wheel inside the hole to smooth it out and remove the paint. Coat the inside of the hole with anti-seize. Have the bushing sit in the freezer for 24 hrs before install?

The hole is NOT perfectly round. When welding the sub-frame together. The welding distorted the hole.

You're almost there in the 2nd picture. A BF hammer might get you there. I've installed a couple of these. What you could do. Since you have the sub-frame out. Install the diff. What will be the telling point. Is how easy it is to thread the 2 front bolts into the sub-frame. If one of the bolts won't thread easy. Then you know that the bushing has to be moved. The first one I installed. I had to tap the bushing deeper into the hole to get both front bolts to thread. I had the front of the bushing flush with the hole.
Thanks Rusty,

Yes it is a SPL bushing. I installed the bushing on the side closest to the rear bumper. I soaked the bushing in a dry-ice alcohol slushie for a couple hours prior to install, along with some silicone paste inside the bushing hole. The one thing I did not do was smooth out the inside which is most likely the reason for it being so difficult (sigh).

I was debating on if i should even try lining up the diff, but I will give it a shot tomorrow.
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Old 09-11-2020, 08:05 PM   #4 (permalink)
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Update?
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Old 09-15-2020, 01:47 PM   #5 (permalink)
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you need to push that in more if not you are going to have issues bolting up the diff to the sub frame and you will end up stripping the differential bolts...
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Old 09-15-2020, 04:11 PM   #6 (permalink)
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Quote:
Originally Posted by MrJdmNismo View Post
you need to push that in more if not you are going to have issues bolting up the diff to the sub frame and you will end up stripping the differential bolts...
Sounds like you have done this. I came close.
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Old 10-28-2020, 11:26 PM   #7 (permalink)
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[/QUOTE]
I guess my question is.. is the bushing, as it sits now, good enough for use? I was going to take it to one last shop when they're opened and if they can't do it I was going to have to remove it and I'll just go poly.


EDIT: Did a parts search and it shows the same part # for the subframe on both the nismo and nonnismos .
Thanks all[/QUOTE]

I installed the NISMO solid differential bushings and I got it about the same as you (maybe an 1/8th inch away from the front being flush with the subframe)!? I bolted the differential up and torqued it down. Went back after about a week and rechecked the torque, it hadnít budged!! Itís been 6 months now and itís been fine!
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