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#2459345 - 03/01/18 09:29 AM Pinion snubber instead of HD leaf springs?
74RALLYE Offline
pro stock

Registered: 01/20/03
Posts: 1593
Loc: A certified culture free zone.
Before I buy my 3rd drive shaft, I want to address the real problem. My 74 B body 440/4sp seems to have a lot of axel wrap during launches and hard shifts. Would an adjustable pinion snubber be a good option instead of stiffer leaf springs? Otherwise the factory springs ride well.

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#2459351 - 03/01/18 09:41 AM Re: Pinion snubber instead of HD leaf springs? [Re: 74RALLYE]
moparx Online   content
Dreaming of implants

Registered: 09/03/03
Posts: 8738
Loc: north of coder
i would try a cheap set of slapper bars before i would monkey around with a pinion snubber.
beer

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#2459358 - 03/01/18 09:57 AM Re: Pinion snubber instead of HD leaf springs? [Re: moparx]
wingman Offline
Uncreative Title

Registered: 06/23/04
Posts: 2250
Loc: St. Charles, MO
This has been discussed a lot over the years. IMO a pinion snubber or traction bars are a band-aid fix. The real issue is the springs.

Do you have the front of the spring pack clamped?

http://board.moparts.org/ubbthreads/ubbt...on-snubber.html

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#2459394 - 03/01/18 11:16 AM Re: Pinion snubber instead of HD leaf springs? [Re: 74RALLYE]
cruzin Offline
super stock

Registered: 02/06/03
Posts: 1102
Loc: Tucson, AZ
Have you checked your setup for the correct pinion angle at any time?

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#2459398 - 03/01/18 11:27 AM Re: Pinion snubber instead of HD leaf springs? [Re: 74RALLYE]
topside Online   content
I Live Here

Registered: 01/19/03
Posts: 12199
Loc: So Near, Yet So Far
The front section of the spring controls wrap, the rear is more of the rate & ride quality. A 440/4speed should at least have the "XHD" (aka "Hemi") rear springs. Clamping the front segment in a couple places works even with slicks. If you don't get separation (springs driving tires down during launch), then the taller snubber will limit rotation of the axle, but it's the springs' ft section that should be addressed. On my drag car that does get a lot of separation the snubber did nothing and I don't run one on that car. It uses modified SS springs & clamped ft sections.

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#2459414 - 03/01/18 11:48 AM Re: Pinion snubber instead of HD leaf springs? [Re: 74RALLYE]
Cab_Burge Offline
I Win

Registered: 08/23/03
Posts: 30818
Loc: Bend,OR USA
Don't the 1973 or 1974 and later B body use different length and different mounting on the leaf springs than the pre 1973? If so as you have already discovered the leaf springs, non HD, don't work for what you want them to do shruggy The snubber can't fix the springs work
Buy the best springs you can get for what you want them to do up scope twocents


Edited by Cab_Burge (03/01/18 11:49 AM)
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#2459453 - 03/01/18 01:18 PM Re: Pinion snubber instead of HD leaf springs? [Re: 74RALLYE]
PurpleBeeper Offline
super stock

Registered: 07/05/11
Posts: 728
Loc: Chicago
Topside's info is interesting. I don't run at the track (no roll bar), but I have SS springs, clamped in the front (3 clamps each side) and my pinion snubber hits the floorboard hard....hard enough that I bought one of those hemi pinion snubber reinforcement plates since I was ripping my floorboard.

In my limited experience, both pinion snubbers and slapper bars worked effectively, but I was mainly trying to prevent wheel hop.
_________________________
70 Roadrunner convt. street car 440+6, NOS, 4-spd, SS springs '96 Mustang GT convt. street car '04 4.6 SOHC, NOS, auto, lowered "Officer, that button is for short on-ramps"

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#2459597 - 03/01/18 06:32 PM Re: Pinion snubber instead of HD leaf springs? [Re: 74RALLYE]
DaveRS23 Offline
master

Registered: 01/20/03
Posts: 4617
Loc: Benton, IL.
You didn't say if this was a street or track car. But, back in the 70s when we didn't have many choices and less information, we always used snubbers. Mostly to save the rear U-joints.

They did that job, but you had to have the snubber fairly close to the body in order for it to do it's job. And man, did the car ride rough like that.

And yes, the floor needed re-enforced at the point of contact.
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KOS

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#2459619 - 03/01/18 07:19 PM Re: Pinion snubber instead of HD leaf springs? [Re: 74RALLYE]
forphorty Offline
pro stock

Registered: 11/26/06
Posts: 1288
Loc: oklahoma

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#2459671 - 03/01/18 08:45 PM Re: Pinion snubber instead of HD leaf springs? [Re: 74RALLYE]
screamindriver Offline


Registered: 02/14/04
Posts: 7088
Loc: Harrisburg, Pa.
Yes, if the stock isolators are tired they'd contribute to the axle wind up.. As already stated if the pinion angle at rest is off it too could leave the axle wrap up too far under load...I ended up cutting the iso axle perches off,welding the earlier style on the housing and adding super stock springs on the 73 RR...Problem solved,no adjustable snubber..

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#2459674 - 03/01/18 08:50 PM Re: Pinion snubber instead of HD leaf springs? [Re: topside]
Magnum Offline
master

Registered: 01/24/03
Posts: 5621
Loc: Hamilton, Ontario Canada
Originally Posted By topside
The front section of the spring controls wrap, .


This is the answer to your problem. You need a stronger front segment.

Here are a few reasons to avoid the other solutions:

Clamping springs takes away their ability to slide against each other. Without the slide, there will be a bind. If by chance there is enough action to force them to slide, they will not slide back. So the spring will have a memory, compress and the will not fully decompress. The car will not return to the original ride height.

Pinion snubbers. While they will stop the nose of the differential from rising. They will also stop any suspension travel. This was probably designed by the same engineer that gave us negative caster and ammeters in the dashboard.
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69 Super Bee, 93 Mustang LX, 04 Allure Super

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#2459700 - 03/01/18 09:39 PM Re: Pinion snubber instead of HD leaf springs? [Re: 74RALLYE]
hemi-itis Offline
I Live Here

Registered: 12/29/07
Posts: 10528
Loc: Great Neck,LI,new york
Been there,,,done that.Went with Cal traks and adjustable shocks with great results!
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HEMI-ITIS has no cure. My condition is fully BLOWN!!!

New best 60ft,, 1.42,1/8, 6.0 @117,, 9.38 @146.75 with 6 lbs boost @3700 lbs

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#2459729 - 03/01/18 10:11 PM Re: Pinion snubber instead of HD leaf springs? [Re: 74RALLYE]
74RALLYE Offline
pro stock

Registered: 01/20/03
Posts: 1593
Loc: A certified culture free zone.
My pinion angle is ok and I'm not on the track or running sticky tires. I do have the iso-rubber rear leaf springs. From everyone's advice, it looks like my best option is to switch over to the '71 style springs and learn about spring clamping,
Insted of changing the spring perches, can't I just fab up Ann adaptor for the centering pin on the spring perch?

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#2459833 - 03/02/18 08:02 AM Re: Pinion snubber instead of HD leaf springs? [Re: 74RALLYE]
NachoRT74 Offline
master

Registered: 08/14/07
Posts: 5004
Loc: Caracas, Venezuela, SouthAmeri...
there is Poly spring isolator option... the best of both worlds

https://www.ebay.com/itm/Energy-Suspensi...yMAAOSwuHdaZfy7

if you are not to race... why sacrifice that and make all those changes. Just replace rubbers for poly, and done.

then, I'm agreed, extra leaf on the stock ones, and one more half leaf to the front

I'll be working on that. Although won't change to poly. I like the comfort features. My car got performance upgrades but still a street car.

Yes, The pinnion snubber is kinda harsh on a street car ( I have it )

I think its time to focus on the car useage. Why remove all the comfort features when is not really needed ? just because ppl keeps saying is a [censored] ? enjoy the car on the way it is, just upgrading some stuff for "better" handling doesn't require change all its parts and advantages. The parts for upgrades are available on the stock setups


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#2460189 - 03/02/18 07:09 PM Re: Pinion snubber instead of HD leaf springs? [Re: NachoRT74]
B5 Bee Offline
master

Registered: 02/28/03
Posts: 8020
Loc: Pangaea
Springs should be designed to launch the car.

The snubber is a safety device in case the front spring segment allows too much wrap up, breaking the U-joint. It should not be set to hit, if possible.

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