Correct way to raise the back end?
#2153975
09/13/16 09:05 PM
09/13/16 09:05 PM
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Joined: Jun 2013
Posts: 1,521 Tacoma, Washington USA
Adam71Charger
OP
pro stock
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OP
pro stock
Joined: Jun 2013
Posts: 1,521
Tacoma, Washington USA
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I admit I like the 70's raised back end look, but I don't want to achieve it at a large sacrifice to handling. Usually I see this accomplished through really tall spring hangars and air shocks. I just did a spring relocation and a mini tub, and put in the MP XHD springs. Unfortunately, the springs sit way lower than I had hoped. With a 15x10 wheels, and a mild 500ish hp 440, I don't want to much tire for the engine, so I think I should stick with 28's for now. What I'm getting at is the back end doesn't sit as high as I like. Is there any way to get it higher without changing the springs? I'd like to stay away from pump up air shocks
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Re: Correct way to raise the back end?
[Re: Adam71Charger]
#2153992
09/13/16 09:28 PM
09/13/16 09:28 PM
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Joined: Apr 2010
Posts: 4,154 bethlehem pa
mikemee1331
master
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master
Joined: Apr 2010
Posts: 4,154
bethlehem pa
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I admit I like the 70's raised back end look, but I don't want to achieve it at a large sacrifice to handling. Usually I see this accomplished through really tall spring hangars and air shocks. I just did a spring relocation and a mini tub, and put in the mp Che springs. Unfortunately, the springs sit way lower than I had hoped. With a 15x10 wheels, and a mild 500ish hp 440, I don't want to much tire for the engine, so I think I should stick with 28's for now. What I'm getting at is the back end doesn't sit as high as I like. Is there any way to get it higher without changing the springs? I'd like to stay away from pump up air shocks i don't think there is any other way except to re-arch your springs. longer shackles maybe but they look goofy
Last edited by mikemee1331; 09/13/16 09:31 PM.
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Re: Correct way to raise the back end?
[Re: ahy]
#2154108
09/13/16 11:54 PM
09/13/16 11:54 PM
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Joined: Nov 2003
Posts: 36,040 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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this might be a stretch but would it be feasable to lower the front 4 hole and the rear 2 hole rear mounting points with some welded stock? I think that would at least keep the rate the same. However which way you achieve your goal I would check the ujoint angles when done. for sure no air shocks
live every 24 hour block of time like it's your last day on earth
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Re: Correct way to raise the back end?
[Re: Adam71Charger]
#2154136
09/14/16 12:35 AM
09/14/16 12:35 AM
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Joined: Apr 2003
Posts: 348 Texas Hill Country
Centerline
enthusiast
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enthusiast
Joined: Apr 2003
Posts: 348
Texas Hill Country
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Air shocks get a bad rap... and probably for good reason in Mopar circles. They work just fine in most cases but Mopars just don't have upper shock mounts strong enough to handle the extra stress. Especially when the metal is 50+ years old. I'm building a 426 Street Wedge recreation and back in the day the owner would have used air shocks or shocks with helper springs to get the stance he wanted. To solve this weakness problem, I added a piece of 2"x 2"x .120 wall square tubing as an integrated crossmember to supplement the stock shock mounts. Admittedly it would have been a difficult job if the car hadn't been on a rotisserie. Bottom line: this will add enough strength to the mounts that I won't have to worry about ripping them out with air shocks.
Centerline 64 Dodge Polara 426 Street Wedge - For when I want to go fast 99 Corvette Z-06 - For when I want to turn corners
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Re: Correct way to raise the back end?
[Re: Adam71Charger]
#2154302
09/14/16 12:05 PM
09/14/16 12:05 PM
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Joined: Apr 2003
Posts: 348 Texas Hill Country
Centerline
enthusiast
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enthusiast
Joined: Apr 2003
Posts: 348
Texas Hill Country
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Nice mod centerline. Now that you guys mention it, I remember being bewildered when we had the rear out to do the mini tub. I couldn't believe how flimsy the shock mounts were, it was like floor pan thickness at most. I did weld on some thick washers to the mount holes which had become elongated Yea, the mounts themselves are made of pretty thick material but they're spot welded to maybe 18 ga. sheet metal. When I did my mod I perimeter welded each mount to the square stock just to make sure they wouldn't pull away.
Centerline 64 Dodge Polara 426 Street Wedge - For when I want to go fast 99 Corvette Z-06 - For when I want to turn corners
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Re: Correct way to raise the back end?
[Re: Adam71Charger]
#2154392
09/14/16 02:38 PM
09/14/16 02:38 PM
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Joined: Jan 2003
Posts: 75,005 U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,005
U.S.S.A.
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I admit I like the 70's raised back end look, but I don't want to achieve it at a large sacrifice to handling. Usually I see this accomplished through really tall spring hangars and air shocks. I just did a spring relocation and a mini tub, and put in the mp Che springs. Unfortunately, the springs sit way lower than I had hoped. With a 15x10 wheels, and a mild 500ish hp 440, I don't want to much tire for the engine, so I think I should stick with 28's for now. What I'm getting at is the back end doesn't sit as high as I like. Is there any way to get it higher without changing the springs? I'd like to stay away from pump up air shocks You've already compromised the handling by moving the springs inboard, raising like we did back then is only going to make the handling worse ... Good luck in your quest.
running up my post count some more .
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Re: Correct way to raise the back end?
[Re: dogdays]
#2154935
09/15/16 06:38 AM
09/15/16 06:38 AM
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Joined: Jun 2013
Posts: 1,521 Tacoma, Washington USA
Adam71Charger
OP
pro stock
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OP
pro stock
Joined: Jun 2013
Posts: 1,521
Tacoma, Washington USA
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Whatever you end up doing, try to keep the front and rear pivot points at the same relative height from the ground. Change the relationship too much and you get into self-steering effects. For example, my '64Dog rear was set up, stock, so that when the vehicle tilts one way, the rear end steers in the same direction. It isn't much when unloaded, but I do a lot of mountain driving and having the rear start steering itself towards the outside of a curve is kind of spooky.
R.
Dogdays, can you elaborate for me, I'm not fully understanding the pivot points. Do you mean the the height off the ground the front and rear of the springs attaches to the frame?
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Re: Correct way to raise the back end?
[Re: Adam71Charger]
#2155122
09/15/16 02:55 PM
09/15/16 02:55 PM
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Joined: Aug 2003
Posts: 43,163 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,163
Bend,OR USA
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Redrill the front mount to lower the bolt hole, that will raise the the rear of the car up. The lower the hole to the bottom of the mount the higher the rear of the car will be raised You can test that by using a block of wood as a spacer between the top of spring eye and the inside of the mount with the bolt removed
Last edited by Cab_Burge; 09/15/16 02:57 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Correct way to raise the back end?
[Re: Cab_Burge]
#2155193
09/15/16 05:00 PM
09/15/16 05:00 PM
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Joined: May 2003
Posts: 1,751 Graham, WA
Polarapete
top fuel
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top fuel
Joined: May 2003
Posts: 1,751
Graham, WA
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Redrill the front mount to lower the bolt hole, that will raise the the rear of the car up. The lower the hole to the bottom of the mount the higher the rear of the car will be raised You can test that by using a block of wood as a spacer between the top of spring eye and the inside of the mount with the bolt removed I built my own front spring mounts when I narrowed the rear on my '68 Coronet bracket car. They were boxes that I welded into the subframe with four sets of holes for the front spring mount. I had planned to use the SuperStock springs so the front sets were for the stock length springs and the rear sets were for the shorter SS springs. I drilled each pair with a lower and an upper mount. Actually the car hooked so well that I stuck with the stock springs. The Ramcharger is going to get rollers in the back to keep it low. On the subject of ride height, I went for a ride yesterday with a friend in his '36 Plymouth street rod that is low and far from slow. It handled like a go-kart on steroids, that was fun!!
1986 Dodge Ramcharger 440 2wd, Bracket Racer Under Construction 1998 Ram 2500 QuadCab, new daily driver. 2008 Honda Element 2014 Carry-On 7x14 Cargo Trailer
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Re: Correct way to raise the back end?
[Re: Adam71Charger]
#2156195
09/17/16 12:40 PM
09/17/16 12:40 PM
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Joined: Sep 2007
Posts: 14,889 up yours
Supercuda
About to go away
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About to go away
Joined: Sep 2007
Posts: 14,889
up yours
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There is no "correct way" to raise your back end.
Because raising the back end is never optimal in a car.
It shifts the weight forward, lessening traction and braking.
It raises the CG, making handling worse.
When I see a car with it's rear jacked up it tells me musclecar equivalent of a ricer.
They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.
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