Bigger Bumpstop ????? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

72BLAZERDUDE · 03-28-2015, 05:09 PM

Just did a prefit with the bags on the back of my 72 Blazer. C Notch installed and the bags (Firestone 2600) on top of the stock trailing arms. It has a 1 1/2 tall cup on top to clear the fitting. Current bumpstops are urethane about a 1/2 thick. I jacked up the rear end and the bags completely bottom out about 1 1/2 before hitting the bumpstop. Isn't it supposed to rest on the bumpstop when aired out. Cant be right as I would think that you dont want the full weight of the Blazer on the bags when they are aired out. Do I need a bigger bumpstop or maybe some 1 or 2 inch blocks. The blocks would also solve the issue of the panhard bar (Early Classics kit) hitting the bottom of the C-notch when aired out. Am I missing something in the picture ?.

72BLAZERDUDE · 03-28-2015, 05:26 PM

forgot to post pics

SCOTI · 03-29-2015, 09:27 AM

Blocks or bolting the bag directly to the frame (eliminate the 'hat') would as well.

**PGSigns** · 03-29-2015, 09:38 AM

When you start getting that low the porterbuilt panhard bar is a better choice. It will drop the bar on the drivers side and move the pass side to the side of the trailing arm. That will fix the issue in the pictures. I dont think a two inch block will make it. My bags are bolted directly to the frame on the 65 using just a bag plate to spread the load.
Jimmy

72BLAZERDUDE · 03-29-2015, 11:28 AM

If you bolt the bags directly to the frame, what do you do about the airfitting. The Firestone bags have two mounting studs at the top and the airfitting is offset. That means to mount the bag i need to drill holes lengthwise and that pushes the airfitting out just under the edge of the frame. Cant mount it the other way because the frame is not wide enough for the studs. My son thinks he has a few sets of blocks in different heights. That seems to be the easiest fix if it works.

**Hart_Rod** · 03-30-2015, 07:59 PM

I added a 2" block to my suburban and It worked fine.

**lolife99** · 03-30-2015, 08:16 PM

Use a 2" block.
(will help keep the ride height low with the correct air in the bag)

Bolt the bag directly to the frame with three holes.
(2 bag mounts, 1 air line fitting)

The center section of the rearend will hit the bed floor before the axle tube bottoms out in the bag.
(A bumpstop is required to prevent this)

**lolife99** · 03-30-2015, 08:18 PM

http://67-72chevytrucks.com/vboard/s...d.php?t=603492

03-28-2015, 05:09 PM	#1
72BLAZERDUDE Registered User Join Date: Jan 2002 Location: WATAUGA,TX Posts: 675	Bigger Bumpstop ????? Just did a prefit with the bags on the back of my 72 Blazer. C Notch installed and the bags (Firestone 2600) on top of the stock trailing arms. It has a 1 1/2 tall cup on top to clear the fitting. Current bumpstops are urethane about a 1/2 thick. I jacked up the rear end and the bags completely bottom out about 1 1/2 before hitting the bumpstop. Isn't it supposed to rest on the bumpstop when aired out. Cant be right as I would think that you dont want the full weight of the Blazer on the bags when they are aired out. Do I need a bigger bumpstop or maybe some 1 or 2 inch blocks. The blocks would also solve the issue of the panhard bar (Early Classics kit) hitting the bottom of the C-notch when aired out. Am I missing something in the picture ?. __________________ 72 2wd 307/AT/AC/TILT WHEEL 78 JIMMY HIGH SIERRA

03-28-2015, 05:26 PM	#2
72BLAZERDUDE Registered User Join Date: Jan 2002 Location: WATAUGA,TX Posts: 675	Re: Bigger Bumpstop ????? forgot to post pics Attached Images __________________ 72 2wd 307/AT/AC/TILT WHEEL 78 JIMMY HIGH SIERRA

03-29-2015, 09:27 AM	#3
SCOTI Registered User Join Date: Apr 2001 Location: DALLAS,TX Posts: 22,064	Re: Bigger Bumpstop ????? Blocks or bolting the bag directly to the frame (eliminate the 'hat') would as well. __________________ 67SWB-B.B.RetroRod 64SWB-Recycle 89CCDually-Driver/Tow Truck 99CCSWB Driver All Fleetsides @rattlecankustoms in IG Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive. It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar..... *Cubic inches is like Indiana Jones with a cheap pistol.*

03-29-2015, 09:38 AM	#4
PGSigns Senior Member Join Date: Jan 2011 Location: Hayes Va Posts: 4,569	Re: Bigger Bumpstop ????? When you start getting that low the porterbuilt panhard bar is a better choice. It will drop the bar on the drivers side and move the pass side to the side of the trailing arm. That will fix the issue in the pictures. I dont think a two inch block will make it. My bags are bolted directly to the frame on the 65 using just a bag plate to spread the load. Jimmy __________________ 60 to 66 Chevy and GMC window decals http://67-72chevytrucks.com/vboard/s...d.php?t=661131 Good friends, good food and a hotrod what else do you need? 1966 BBW long fleet Daily driver 1965 BBW short fleet Sold and going to a good home 1965 Suburban 2003 3500 Duramax 2005 Ultra Classic

03-29-2015, 11:28 AM	#5
72BLAZERDUDE Registered User Join Date: Jan 2002 Location: WATAUGA,TX Posts: 675	Re: Bigger Bumpstop ????? If you bolt the bags directly to the frame, what do you do about the airfitting. The Firestone bags have two mounting studs at the top and the airfitting is offset. That means to mount the bag i need to drill holes lengthwise and that pushes the airfitting out just under the edge of the frame. Cant mount it the other way because the frame is not wide enough for the studs. My son thinks he has a few sets of blocks in different heights. That seems to be the easiest fix if it works. __________________ 72 2wd 307/AT/AC/TILT WHEEL 78 JIMMY HIGH SIERRA

03-30-2015, 07:59 PM	#6
Hart_Rod ************* Join Date: Apr 2005 Location: Pensacola, FL Posts: 17,858	Re: Bigger Bumpstop ????? I added a 2" block to my suburban and It worked fine. __________________ Rob - https://www.instagram.com/hart_rod_c10 As Iron Sharpens Iron, So One Man Sharpens Another. Proverbs 27:17 FOR SALE: DBW pedal bracket - http://67-72chevytrucks.com/vboard/s...d.php?t=651123 FOR SALE: Hood Brackets http://67-72chevytrucks.com/vboard/s...d.php?t=679945 1987 Silverado SWB - 34.5K original miles http://67-72chevytrucks.com/vboard/s...d.php?t=801834 1969 SuperBurb - http://67-72chevytrucks.com/vboard/s...d.php?t=200387 1968 Farm truck - http://67-72chevytrucks.com/vboard/s...d.php?t=358692 1968 SWB - http://67-72chevytrucks.com/vboard/s...d.php?t=551258 1948 Chevy - http://67-72chevytrucks.com/vboard/s...=122164&page=3

03-30-2015, 08:16 PM	#7
lolife99 67-72 parts collector,… Join Date: Nov 2002 Location: Mid-MO Posts: 22,700	Re: Bigger Bumpstop ????? Use a 2" block. (will help keep the ride height low with the correct air in the bag) Bolt the bag directly to the frame with three holes. (2 bag mounts, 1 air line fitting) The center section of the rearend will hit the bed floor before the axle tube bottoms out in the bag. (A bumpstop is required to prevent this) Attached Images __________________ Keith Convert to disc brakes. http://67-72chevytrucks.com/vboard/s...d.php?t=444823

03-30-2015, 08:18 PM	#8
lolife99 67-72 parts collector,… Join Date: Nov 2002 Location: Mid-MO Posts: 22,700	Re: Bigger Bumpstop ????? http://67-72chevytrucks.com/vboard/s...d.php?t=603492 __________________ Keith Convert to disc brakes. http://67-72chevytrucks.com/vboard/s...d.php?t=444823

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