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spring perch question #224656 02/14/09 04:43 PM 02/14/09 04:43 PM
Joined: May 2004 Posts: 3,210 robin hood country deaks OP master
deaks OP master Joined: May 2004 Posts: 3,210 robin hood country	I am fitting a Dana into my Dart and making new front spring hangers with the holes a little higher and further back to lower the rear of the car. What angle should i weld the perches, bearing in mind, the axle is out of the car. My old axle the perches were 5 degrees down. Mike 69 Dart GTS 440 mopar .590 cam, Edelbrock heads, 3200# best et 6.45, 106.78, 10.14, 132.88 mph, 1.47 60ft best 60ft 1.36

Re: spring perch question [Re: deaks] #224657 02/14/09 09:39 PM 02/14/09 09:39 PM
Joined: Apr 2005 Posts: 12,271 Overpriced Housing Central RobX4406 I Live Here
RobX4406 I Live Here Joined: Apr 2005 Posts: 12,271 Overpriced Housing Central	I'd wait and get them set with proper pinion angle. No telling where it will end up. You could set it to a factory angle, but, that may totally wrong for the new set up.

Re: spring perch question [Re: RobX4406] #224658 02/15/09 10:36 AM 02/15/09 10:36 AM
Joined: May 2004 Posts: 3,210 robin hood country deaks OP master
deaks OP master Joined: May 2004 Posts: 3,210 robin hood country	I'm thinking off tack welding the perches on at 5 degrees nose down, then drop the axle in place to get the car on it's wheels and taking the measurement from there, whilst checking the trans at the same time. Mike 69 Dart GTS 440 mopar .590 cam, Edelbrock heads, 3200# best et 6.45, 106.78, 10.14, 132.88 mph, 1.47 60ft best 60ft 1.36

Re: spring perch question [Re: deaks] #224659 02/15/09 11:08 AM 02/15/09 11:08 AM
Joined: Jun 2003 Posts: 52,972 Romeo MI MR_P_BODY Master
MR_P_BODY Master Joined: Jun 2003 Posts: 52,972 Romeo MI	If you can set the rearend in the car like it would be(where you want it), use stands and wedges to get about 6* down from the tailshaft on the trans to the pinion. Put a couple of good tac welds on. Once you get the pinion angle you can hook up the springs. The front really wont change the height of the car, the rear of the spring does that

Re: spring perch question [Re: MR_P_BODY] #224660 02/15/09 11:17 AM 02/15/09 11:17 AM
Joined: Jul 2005 Posts: 8,647 ELYRIA,OH B blownzoom440
blownzoom440 B Joined: Jul 2005 Posts: 8,647 ELYRIA,OH	wouldnt the pinion* depend on the spring rate and TQ output of the engine at the pinion?i imagine it is complicated to figure mostly due to the front spring segment rate.i have never herd it mentioned. could you put a hyd jack with a psi gauge on the pinion and apply pressure to determine the angle #rate?

Re: spring perch question [Re: blownzoom440] #224661 02/15/09 11:23 AM 02/15/09 11:23 AM
Joined: Jun 2003 Posts: 52,972 Romeo MI MR_P_BODY Master
MR_P_BODY Master Joined: Jun 2003 Posts: 52,972 Romeo MI	Quote: wouldnt the pinion* depend on the spring rate and TQ output of the engine at the pinion?i imagine it is complicated to figure mostly due to the front spring segment rate.i have never herd it mentioned. could you put a hyd jack with a psi gauge on the pinion and apply pressure to determine the angle #rate? Sure torque plays into itbut you have to start somewhere and the way I use to check the pinion rap up was using clay on the floor pan

Re: spring perch question [Re: MR_P_BODY] #224662 02/15/09 11:32 AM 02/15/09 11:32 AM
Joined: Jul 2005 Posts: 8,647 ELYRIA,OH B blownzoom440
blownzoom440 B Joined: Jul 2005 Posts: 8,647 ELYRIA,OH	sorry if i over complecated an idea. how would you keep the clay on the floorpan?determine how much? Thanks for your input!

Re: spring perch question [Re: blownzoom440] #224663 02/15/09 11:43 AM 02/15/09 11:43 AM
Joined: Jun 2003 Posts: 52,972 Romeo MI MR_P_BODY Master
MR_P_BODY Master Joined: Jun 2003 Posts: 52,972 Romeo MI	Quote: sorry if i over complecated an idea. how would you keep the clay on the floorpan?determine how much? Thanks for your input! I used a clean floor pan and then smeared clay on it with my thumb to get a coated area (you can tell if it will hold) then stacked up the clay on that area. Also when doing this you need to take in to account the body drop so I used tie raps on the shock

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