#41  
Old 03-01-2021, 07:49 PM
grivera's Avatar
grivera grivera is online now
Ultimate Warrior
 
Join Date: Feb 2005
Location: Just south of Baltimore
Posts: 3,513
Default

Gotcha- is it tubbed?

I bought the Hotchkis 1.5” leafs and 2” coils. I removed one of the old 5 leaf-springs (d-side) and the arc is noticeably more pronounced than the Hotchkis spring. I hope the stiffness of the new springs are enough to make it sit a little higher.

In related news I have to sand the holes in the frame to accept the poly bushings- can’t get past go.

__________________
Will Rivera

'69 Bird 400/461: Eagle forged assembly; Ross Pistons w/8cc reliefs; JBP 290+ E D-Ports @ 81cc; SD Stump Puller (230/236@50 .565/.570 lift 112 LSA) 857-16 Lifters; Sniper EFI with Hyperspark Dizzy, CD Box and Coil, RPM Intake, RARE LB Manifolds, 2.5 exhaust, x-pipe and Dynomax ST's; TH400, 13" Continental Converter; 3.08 8.5" 10-bolt
  #42  
Old 03-01-2021, 09:15 PM
JLMounce JLMounce is offline
Ultimate Warrior
 
Join Date: Sep 2005
Location: Greeley, Colorado
Posts: 2,593
Send a message via AIM to JLMounce
Default

Stock tubs, slight trimming on 1/4 panel lip

I did a video on this subject that discusses the why and how of getting bigger rubber in these cars.

https://youtu.be/ebtYfydBU60

__________________
-Jason
1969 Pontiac Firebird
  #43  
Old 03-01-2021, 11:45 PM
grivera's Avatar
grivera grivera is online now
Ultimate Warrior
 
Join Date: Feb 2005
Location: Just south of Baltimore
Posts: 3,513
Default

Great video with very helpful information

__________________
Will Rivera

'69 Bird 400/461: Eagle forged assembly; Ross Pistons w/8cc reliefs; JBP 290+ E D-Ports @ 81cc; SD Stump Puller (230/236@50 .565/.570 lift 112 LSA) 857-16 Lifters; Sniper EFI with Hyperspark Dizzy, CD Box and Coil, RPM Intake, RARE LB Manifolds, 2.5 exhaust, x-pipe and Dynomax ST's; TH400, 13" Continental Converter; 3.08 8.5" 10-bolt
  #44  
Old 03-09-2021, 09:16 AM
grivera's Avatar
grivera grivera is online now
Ultimate Warrior
 
Join Date: Feb 2005
Location: Just south of Baltimore
Posts: 3,513
Default

Update -

I ended up ordering and installing the Hotchkis 1.5 drop leafs kit which come with 1/2" u-bolts and new shackles - the poly bushings were a bear to install in the upper frame-rail holes!! Also installed the new Detroit Speed shock plates and Bilstein HD shocks in rear - it's firm!! https://www.jegs.com/i/Hotchkis/515/2407C/10002/-1

For the front I ordered the BMR upper and lower A-arms - caught a scratch and dent set for $698! Also ordered the Hotchkis 2" drop coil springs. The install will include all new linkage, Addco Industries 1" sway bar with poly bushings, Borgeson steering gear and Bilstein HD front shocks. https://bmrsuspension.com/index.cfm?...601&superpro=0

My front suspension is in terrible shape so I expect a dramatic difference - maybe a little firm?

I realize my tires and wheels are a bit dated being 15x7" wheels, 245 60 15 in rear (26.5 diameter) and 235 60 15 in front.

__________________
Will Rivera

'69 Bird 400/461: Eagle forged assembly; Ross Pistons w/8cc reliefs; JBP 290+ E D-Ports @ 81cc; SD Stump Puller (230/236@50 .565/.570 lift 112 LSA) 857-16 Lifters; Sniper EFI with Hyperspark Dizzy, CD Box and Coil, RPM Intake, RARE LB Manifolds, 2.5 exhaust, x-pipe and Dynomax ST's; TH400, 13" Continental Converter; 3.08 8.5" 10-bolt

Last edited by grivera; 03-09-2021 at 09:39 AM.
  #45  
Old 03-09-2021, 11:11 AM
JLMounce JLMounce is offline
Ultimate Warrior
 
Join Date: Sep 2005
Location: Greeley, Colorado
Posts: 2,593
Send a message via AIM to JLMounce
Default

did the ride height change at all in the rear with the new leafs?

__________________
-Jason
1969 Pontiac Firebird
  #46  
Old 03-09-2021, 12:14 PM
grivera's Avatar
grivera grivera is online now
Ultimate Warrior
 
Join Date: Feb 2005
Location: Just south of Baltimore
Posts: 3,513
Default

If I'm measuring correctly, I picked up an inch at the rocker panel. From ground to the lip at center of wheel opening I have just over 25". Measurement taken with an empty fuel tank though as I had to remove tank to get the bushings in. That being said it seems it will take lots of weight to get that back end to budge.

__________________
Will Rivera

'69 Bird 400/461: Eagle forged assembly; Ross Pistons w/8cc reliefs; JBP 290+ E D-Ports @ 81cc; SD Stump Puller (230/236@50 .565/.570 lift 112 LSA) 857-16 Lifters; Sniper EFI with Hyperspark Dizzy, CD Box and Coil, RPM Intake, RARE LB Manifolds, 2.5 exhaust, x-pipe and Dynomax ST's; TH400, 13" Continental Converter; 3.08 8.5" 10-bolt
  #47  
Old 03-13-2021, 05:23 PM
grivera's Avatar
grivera grivera is online now
Ultimate Warrior
 
Join Date: Feb 2005
Location: Just south of Baltimore
Posts: 3,513
Default

So comparing the new Hotchkis front springs 2” drop to the ones I removed there is a about a 5” difference. The old ones free length is about 17.25” and new ones about 12.25” which seems really short. Does this make sense? I won’t have them in the car for another week due to work and wagon the a-arms to arrive.
Attached Thumbnails
Click image for larger version

Name:	AB1D52BE-9256-482B-A4F5-7B19927DC3FB.jpg
Views:	15
Size:	102.9 KB
ID:	562597  

__________________
Will Rivera

'69 Bird 400/461: Eagle forged assembly; Ross Pistons w/8cc reliefs; JBP 290+ E D-Ports @ 81cc; SD Stump Puller (230/236@50 .565/.570 lift 112 LSA) 857-16 Lifters; Sniper EFI with Hyperspark Dizzy, CD Box and Coil, RPM Intake, RARE LB Manifolds, 2.5 exhaust, x-pipe and Dynomax ST's; TH400, 13" Continental Converter; 3.08 8.5" 10-bolt
  #48  
Old 04-07-2021, 07:03 PM
grivera's Avatar
grivera grivera is online now
Ultimate Warrior
 
Join Date: Feb 2005
Location: Just south of Baltimore
Posts: 3,513
Default

Here is the new stance - no drive time to settle suspension yet. Also, front shocks not bolted into bottom of control arms yet. I have the steering column out to paint it so won’t get to drive it for a bit. I like the stance and at top of wheel well I get 25” front, 25.5” in back. Not sure if front tires will run yet - I should be good though as they are only 235/60/15

For some reason the right coil spring has a clunk to it when bringing it down from lift. The BMR lower a-arms have a locator for spring which is what I used as opposed to the one in upper spring pocket or otherwise the spring would have been on top of the locating tag. Not sure if that’s why it clunks as it’s seated well inside the pocket - both sides look good in there.
Attached Thumbnails
Click image for larger version

Name:	19EFD422-6369-4B35-A91A-ACF03E1E3EC3.jpg
Views:	41
Size:	76.4 KB
ID:	564263  

__________________
Will Rivera

'69 Bird 400/461: Eagle forged assembly; Ross Pistons w/8cc reliefs; JBP 290+ E D-Ports @ 81cc; SD Stump Puller (230/236@50 .565/.570 lift 112 LSA) 857-16 Lifters; Sniper EFI with Hyperspark Dizzy, CD Box and Coil, RPM Intake, RARE LB Manifolds, 2.5 exhaust, x-pipe and Dynomax ST's; TH400, 13" Continental Converter; 3.08 8.5" 10-bolt
  #49  
Old 04-07-2021, 08:04 PM
vertigto's Avatar
vertigto vertigto is offline
Senior Chief
 
Join Date: Dec 2005
Posts: 376
Default

Stance looks great. Envious of the garage/lift...

__________________

Pontiac Power!
  #50  
Old 04-07-2021, 08:08 PM
grivera's Avatar
grivera grivera is online now
Ultimate Warrior
 
Join Date: Feb 2005
Location: Just south of Baltimore
Posts: 3,513
Default

Thanks! Long time dream! And a work in progress like the bird...

__________________
Will Rivera

'69 Bird 400/461: Eagle forged assembly; Ross Pistons w/8cc reliefs; JBP 290+ E D-Ports @ 81cc; SD Stump Puller (230/236@50 .565/.570 lift 112 LSA) 857-16 Lifters; Sniper EFI with Hyperspark Dizzy, CD Box and Coil, RPM Intake, RARE LB Manifolds, 2.5 exhaust, x-pipe and Dynomax ST's; TH400, 13" Continental Converter; 3.08 8.5" 10-bolt
  #51  
Old 04-07-2021, 09:59 PM
JLMounce JLMounce is offline
Ultimate Warrior
 
Join Date: Sep 2005
Location: Greeley, Colorado
Posts: 2,593
Send a message via AIM to JLMounce
Default

Looks good!

__________________
-Jason
1969 Pontiac Firebird
  #52  
Old 04-07-2021, 10:06 PM
grivera's Avatar
grivera grivera is online now
Ultimate Warrior
 
Join Date: Feb 2005
Location: Just south of Baltimore
Posts: 3,513
Default

Thanks Jason. Is clunking coil spring common when newly installed?

__________________
Will Rivera

'69 Bird 400/461: Eagle forged assembly; Ross Pistons w/8cc reliefs; JBP 290+ E D-Ports @ 81cc; SD Stump Puller (230/236@50 .565/.570 lift 112 LSA) 857-16 Lifters; Sniper EFI with Hyperspark Dizzy, CD Box and Coil, RPM Intake, RARE LB Manifolds, 2.5 exhaust, x-pipe and Dynomax ST's; TH400, 13" Continental Converter; 3.08 8.5" 10-bolt
  #53  
Old 04-08-2021, 01:52 PM
JLMounce JLMounce is offline
Ultimate Warrior
 
Join Date: Sep 2005
Location: Greeley, Colorado
Posts: 2,593
Send a message via AIM to JLMounce
Default

First time down on the tires, or is it happening continuously?

It's not uncommon to get a clunk or two as the suspension takes a set with the weight of the car on it. It's typically ball joints, springs and shocks settling into their position where they want to be.

To an extent, this can happen every time you get the car in the air as the suspension droops past what it typically sees in driving use.

If it's clunking while you're moving or continues to do so more than just a first couple times after the swap, I'd have it back up in the air and make sure everything is seated properly.

__________________
-Jason
1969 Pontiac Firebird
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 07:37 AM.

 

About Us

The PY Online Forums is the largest online gathering of Pontiac enthusiasts anywhere in the world. Founded in 1991, it was also the first online forum for people to gather and talk about their Pontiacs. Since then, it has become the mecca of Pontiac technical data and knowledge that no other place can surpass.

 

Cold Case Radiators

Cold Case Radiators is a Max Performance company that produces high end aluminum performance radiators at a price point that won't break the bank. Polished and stamped tanks. 2 rows of 1" tubes. Lifetime Warranty.

GTOG8TA.com

GTOG8TA.com is a Max Performance company that manufacturers parts for the 04-06 GTO, 08-09 G8, and 93-02 Firebird/Trans Am platforms.

Copyright © 2017