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Rear Differential mount bushings

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Old Dec 21, 2008 | 05:54 PM
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Default Rear Differential mount bushings

So, I'm in the middle of a COMPLETE rebuild and modification of my 75's suspension, and noticed that the bushings that hold the differential mount (the ~3inch rubber bushings on the outer end of the differential mount crossmember) looked a little cracked and broken. looking through ecklers and VB+P websites, i cannot seem to find the bushings. is there a special name for them?

also, is there a poly replacement for them?


in addition, where can i get replacement bumpstops for the lower front control arms?
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Old Dec 21, 2008 | 05:54 PM
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and while we're at it, any of the NHRA guys know if half-shaft loops are required for sportsman competition?
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Old Dec 21, 2008 | 07:10 PM
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VB&P has them for sure- I got a pair last winter. Differential Crossmember Mount bushings.
No idea on the NHRA rules, but it seems like a pretty good idea. I've seen the damage of a halfshaft failure- it ain't pretty.
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Old Dec 21, 2008 | 07:27 PM
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I just ordered a set from Mid America. Showed up in maybe 3-4 days.

Also I believe I saw the control arm bumpstops from them as well. Their catalog is fantastic for its pictures. If you get on the list, youll have a catalog for every season.

Brent.

Last edited by MN-Brent; Dec 21, 2008 at 07:29 PM.
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Old Dec 22, 2008 | 05:49 AM
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Originally Posted by Nemesis_152
also, is there a poly replacement for them?
I've never seen any poly bushings available. If you want some to help locate the rear suspension better you'll have to fabricate some; that's what I did.
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Old Dec 22, 2008 | 07:12 AM
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Originally Posted by Jason Staley
I've never seen any poly bushings available. If you want some to help locate the rear suspension better you'll have to fabricate some; that's what I did.
could you give me more information about your fabrication? i'd prefer to avoid reinventing the wheel if i could.


also, i see that VB+P sells some sort of reinforcement (looks like a billet insert) and the description simply says "you need these." anyone know what they are or even used them?
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Old Dec 22, 2008 | 01:36 PM
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We have poly differential mount bushings for $32 free shipping.

http://www.duntovmotors.com/Differentials_63-79.htm
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Old Dec 22, 2008 | 02:57 PM
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Originally Posted by Lightweight 001
We have poly differential mount bushings for $32 free shipping.

http://www.duntovmotors.com/Differentials_63-79.htm
that link doesnt work, and i need the differential crossmember mount bushings, not the forward diff mount bushing
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Old Dec 23, 2008 | 06:06 AM
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Nemesis_152,

Here's how I made mine. I started off using a polyurethane caster from a farm store of all places, and cut the wheel out of it. I left the ID a little small and forced it onto the frame using a 1/4" steel plate you can see in my diagram.



Since I didn't have a means of making a custom bushing, I had to take this multi-piece aproach to make it work. The rubber pads keeps the gear noise to a minimum.

Oh yeah, one thing to note about my setup. It raises the rear differential about 5/8" so you can lower the rear of the car without upsetting the half shaft angles.

Last edited by Jason Staley; Dec 23, 2008 at 06:08 AM.
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Old Dec 23, 2008 | 07:11 AM
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The billet plate pretty much locks the mount together, usually you see them on high horsepower drag cars. Pretty cheap insurance for 90$ mounts.
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Old Dec 23, 2008 | 02:21 PM
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Originally Posted by dmaaero
The billet plate pretty much locks the mount together, usually you see them on high horsepower drag cars. Pretty cheap insurance for 90$ mounts.
well, the car will have around 585 crank hp and will make many passes at the drag strip, so i guess i'll either do a custom setup like jason's or buy the billet plates.


thanks a bunch, guys.


-jeff
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Old Dec 23, 2008 | 02:50 PM
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Originally Posted by Jason Staley
Nemesis_152,

Here's how I made mine. I started off using a polyurethane caster from a farm store of all places, and cut the wheel out of it. I left the ID a little small and forced it onto the frame using a 1/4" steel plate you can see in my diagram.



Since I didn't have a means of making a custom bushing, I had to take this multi-piece aproach to make it work. The rubber pads keeps the gear noise to a minimum.

Oh yeah, one thing to note about my setup. It raises the rear differential about 5/8" so you can lower the rear of the car without upsetting the half shaft angles.
That's how I did mine, only minus the poly bushings and rubber pads and I welded the plates to the cross member. The bolt alone keeps things centered. Yes there is some gear noise....
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Old Dec 23, 2008 | 05:29 PM
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Originally Posted by Nemesis_152
well, the car will have around 585 crank hp and will make many passes at the drag strip, so i guess i'll either do a custom setup like jason's or buy the billet plates.


thanks a bunch, guys.


-jeff
Consider the halfshaft loops...and a driveshaft loop.
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Old Dec 23, 2008 | 05:47 PM
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Originally Posted by SmokinBBC
Consider the halfshaft loops...and a driveshaft loop.
driveshaft loop is already in the plan, halfshaft loops are likely. i dont have an NHRA rulebook here with me, but i will check when i get back near it if the halfshaft loops are required. i'm sure they can't be too tough to fabricate.
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Old Dec 23, 2008 | 06:16 PM
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Originally Posted by Nemesis_152
driveshaft loop is already in the plan, halfshaft loops are likely. i dont have an NHRA rulebook here with me, but i will check when i get back near it if the halfshaft loops are required. i'm sure they can't be too tough to fabricate.
Check out he ones at Dragvette.

http://www.dragvette.com/index.html
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Old Dec 23, 2008 | 06:31 PM
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Originally Posted by SmokinBBC
Check out he ones at Dragvette.

http://www.dragvette.com/index.html
yeah, i've seen them over there, but i think i'd enjoy spending a day or two making them myself.
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