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#958189 - 04/02/11 08:37 PM Re: How to Lower Your 1972-1993 Dodge Pickup [Re: 76dodgeboy]
superbyrd Offline
enthusiast

Registered: 03/19/08
Posts: 388
Loc: kentucky
ummm, pinion angle should be adjusted before the new perches are welded on.......

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#958190 - 04/03/11 01:53 AM Re: How to Lower Your 1972-1993 Dodge Pickup [Re: superbyrd]
76dodgeboy Offline
master

Registered: 08/19/06
Posts: 8063
Loc: Iowa
I know but others might not. Thats why it would be a good how to write up.
Also how to find the correct angle when doing it
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#958191 - 04/03/11 07:36 AM Re: How to Lower Your 1972-1993 Dodge Pickup [Re: 76dodgeboy]
scratchnfotraction Offline
I Live Here

Registered: 05/29/03
Posts: 15010
Loc: Florida
pinion angle

yea,now thats a write up I need

with mine sitting on the ground with the mono leafs with the ssm bars pre-loaded it looks like my pinion is pointing up to much IMO

but I guess it will need to be sorted out then adjusted

it sure lifts the back up when you launch it though

where do you get the shims for pinion adjustments?

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#958192 - 04/03/11 07:56 AM Re: How to Lower Your 1972-1993 Dodge Pickup [Re: scratchnfotraction]
Kevin I Offline
super stock

Registered: 09/13/10
Posts: 718
Loc: Nunnelly, TN
What is the best way to set pinion angle?

I only started taking things apart yesterday. They didn't have my U-bolts in stock at NAPA, so I had to order some.
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#958193 - 04/03/11 11:24 AM Re: How to Lower Your 1972-1993 Dodge Pickup [Re: Kevin I]
BulletBob Offline
master

Registered: 10/20/05
Posts: 5995
Loc: Back home in PA
I level the truck with stands using shims to get it perfect & measure pinion angle with an angle finder before I flip or move spring hangers. I use the same measurement when I reset my angle. On drag vehicles I set the pinion 2-3 degrees lower to deter spring wrap up. Shims can be bought from various places who sell custom suspension parts Comp Engineering etc

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#958194 - 04/07/11 12:02 AM Re: How to Lower Your 1972-1993 Dodge Pickup [Re: BulletBob]
3XCHARM Offline
super stock

Registered: 01/08/05
Posts: 1011
Loc: Sunnyvale, CA.
Quote:

I level the truck with stands using shims to get it perfect & measure pinion angle with an angle finder before I flip or move spring hangers. I use the same measurement when I reset my angle. On drag vehicles I set the pinion 2-3 degrees lower to deter spring wrap up. Shims can be bought from various places who sell custom suspension parts Comp Engineering etc






And make sure the shims actually bolt to the spring pack instead of the "slip in" kind that are crap.
Also from someone who has van lca's and has had the "custom" lca's, THEY ARE THE SAME, meaning the aftermarket custom lca's are designed after the van lac's with the exception that the custom lca's use the standard pickup pivot bushings.

By the way, nice write up by the original poster!




Also, if the "search" function is used the write up and picture progress of the Dakota spindle swap shows that it is not that difficult but you do need to change more parts. IIRC he also used the van lca's along with the dakota spindles, but i might be wrong, the memory aint what it used to be.


Edited by 3XCHARM (04/07/11 12:18 AM)
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1975 Ramcharger 6" lift 35" Mud Terrains 8 lug 44 front, 60 rear. (R.I.P.)
1976 D100 lowered 3" & 5" Now with a 440!!! (sold)
On the hunt for another beauty to build.

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#958195 - 04/07/11 05:38 AM Re: How to Lower Your 1972-1993 Dodge Pickup [Re: 3XCHARM]
superbyrd Offline
enthusiast

Registered: 03/19/08
Posts: 388
Loc: kentucky
the way i do the rear is, with the trucks frame (about 2-3 inches in front of front spring hanger) sitting on jack stands, i put the axle on the new spring perches,mount the new u-bolts,measure everything,2-3-4 times, place a floor jack under the center of the axle,lightly tighten the nuts on the u-bolts, and jack up the rear of the truck to place the weight of the truck on the axle/springs. now i place a magnetic angle finder on the yolk. set my pinion angle (tapping the nose of the diff with a hammer-up or down as needed). when i have it where i want it,i tighten down the u-bolt nuts, then reach in with mig gun and weld the new spring perches on each side. take her off the stands and shes done.

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#958196 - 04/08/11 01:04 AM Re: How to Lower Your 1972-1993 Dodge Pickup [Re: superbyrd]
BulletBob Offline
master

Registered: 10/20/05
Posts: 5995
Loc: Back home in PA
I have also used a flip bracket for a chebbie & got a good angle that way.

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#958197 - 04/08/11 08:35 AM Re: How to Lower Your 1972-1993 Dodge Pickup [Re: BulletBob]
Eck Offline
member

Registered: 11/03/10
Posts: 83
Loc: Ontario Canada
Quote:

I have also used a flip bracket for a chebbie & got a good angle that way.



This may sound like a stupid question....... where do you use a flip bracket and where do you get them

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#958198 - 04/11/11 12:06 AM Re: How to Lower Your 1972-1993 Dodge Pickup [Re: Eck]
BulletBob Offline
master

Registered: 10/20/05
Posts: 5995
Loc: Back home in PA
What I call a flip bracket is the U-shaped bracket that comes in a flip kit for a Chebbie. It goes under the perches & locates the rearend to the springs by fitting up inside the recess on the bottom of the original perch. It takes a little grinding here & there but will work if you don't have a welder. On all my flips I use a lower shock bracket from either a C or B body, whichever I can find

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#958199 - 04/11/11 07:25 AM Re: How to Lower Your 1972-1993 Dodge Pickup [Re: BulletBob]
Eck Offline
member

Registered: 11/03/10
Posts: 83
Loc: Ontario Canada
Got a pic of one?

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#958200 - 04/11/11 10:50 AM Re: How to Lower Your 1972-1993 Dodge Pickup [Re: Eck]
76dodgeboy Offline
master

Registered: 08/19/06
Posts: 8063
Loc: Iowa
I think he is talking about the spring hanger for the front/rear(where ever it goes)
http://www.lmctruck.com/icatalog/cd/full.aspx?Page=121

Way cheaper to get stock front spring hangers and use them in the rear and just flip the ones in the front
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#958201 - 04/12/11 10:28 PM Re: How to Lower Your 1972-1993 Dodge Pickup [Re: 76dodgeboy]
'84 D150 Shorty Offline
Pickup Man

Registered: 09/02/07
Posts: 738
Loc: TN
Just did the van LCA swap today. This thread was spot on for me! Helped me git it done!

BEFORE:

AFTER:
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#958202 - 04/12/11 10:38 PM Re: How to Lower Your 1972-1993 Dodge Pickup [Re: '84 D150 Shorty]
Kevin I Offline
super stock

Registered: 09/13/10
Posts: 718
Loc: Nunnelly, TN
Quote:

Just did the van LCA swap today. This thread was spot on for me! Helped me git it done!




Nicely done. I am happy it helped someone.
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Kevin I

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#958203 - 04/12/11 11:46 PM Re: How to Lower Your 1972-1993 Dodge Pickup [Re: Eck]
BulletBob Offline
master

Registered: 10/20/05
Posts: 5995
Loc: Back home in PA
Quote:

Got a pic of one?


I sure don't but the chebbie flip kit Ive used fit a 73-87 1/2 ton. It's a U-shape that fits under the axle & sits on top of the spring like the perch does. It fits into the stock perch from the bottom side.

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#958204 - 04/13/11 07:04 AM Re: How to Lower Your 1972-1993 Dodge Pickup [Re: BulletBob]
Eck Offline
member

Registered: 11/03/10
Posts: 83
Loc: Ontario Canada
Quote:

I sure don't but the chebbie flip kit Ive used fit a 73-87 1/2 ton. It's a U-shape that fits under the axle & sits on top of the spring like the perch does. It fits into the stock perch from the bottom side.



Oh I see......wont need that I have a disc rear end from a 74 imperial...perch is all ready under the axle as oppose to the top like the truck.
Thanks

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#958205 - 04/13/11 07:25 AM Re: How to Lower Your 1972-1993 Dodge Pickup [Re: Eck]
scratchnfotraction Offline
I Live Here

Registered: 05/29/03
Posts: 15010
Loc: Florida
Quote:

Quote:

I sure don't but the chebbie flip kit Ive used fit a 73-87 1/2 ton. It's a U-shape that fits under the axle & sits on top of the spring like the perch does. It fits into the stock perch from the bottom side.



Oh I see......wont need that I have a disc rear end from a 74 imperial...perch is all ready under the axle as oppose to the top like the truck.
Thanks




your gonna put the Imperial rear axle in a truck?

thats 1 way to get disc brakes

IIRC the c-body axles are same width as a stock truck axle

the perches have to be moved so a new set is needed

the A-body and truck share the same 43" spring centers for a narrowed axle,my 68 A-body 8 3/4 bolted right in for 12s and fattys


.... a narrowed to A-body specs disc brake imperieal 8 3/4,i could gain disc brakes and keep the fattys...very interesting


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#958206 - 04/16/11 11:37 AM Re: How to Lower Your 1972-1993 Dodge Pickup [Re: Kevin I]
Kevin I Offline
super stock

Registered: 09/13/10
Posts: 718
Loc: Nunnelly, TN
Here is what I did on the rear:

I found a pair of leaf spring perches on an old rearend I had. I unbolted the axle and dropped it to the floor. I removed the shocks and dropped the driveshaft to make it easier to move the axle around. You may not have to do either. Then, I clamped the leaf springs together with a C-clamp before I removed the leaf centering pin to flip it over. You will have to remove each leaf spring from their hangers and put them under the axle. Sit the spring perches on top of each leaf spring and sit the axle on top of the spring perches. The new spring perches should be on the exact opposite side of the axle from the original spring perches to keep pinion angle. Clamp everything down using your original lower shock mount plates. Weld the rear axle to the spring perches.



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#958207 - 04/16/11 11:44 AM Re: How to Lower Your 1972-1993 Dodge Pickup [Re: Kevin I]
'84 D150 Shorty Offline
Pickup Man

Registered: 09/02/07
Posts: 738
Loc: TN
Awesome job! Questions: how many inches drop to the axle flip yield? Are those shock mount plates the original ones from the truck or did you have to use different ones? Are using drop shackels in addition to this or doing just the axle flop?
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#958208 - 04/16/11 12:57 PM Re: How to Lower Your 1972-1993 Dodge Pickup [Re: '84 D150 Shorty]
76dodgeboy Offline
master

Registered: 08/19/06
Posts: 8063
Loc: Iowa
Flipping the axle gives about 5-6"(the thickness of the springs, the axle tube and the perch
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