Hellpp! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

drag_72 · 02-24-2010, 10:13 PM

i got a 72 chevy shortbed pro street truck... ladder bars, coil overs, narrowed 9 inch... the whole nine. for some damn reason when i get on it the ass end shimmys back and forth?? i really need some help on this. the truck didnt do it until the guy before me changed the tires?? but he said he messed with the pinion angle and it got better? but its still really bad. i wanna get it lined out before i take it to the track

SCOTI · 02-25-2010, 12:43 AM

Start w/the basics.... Make sure everything is properly fastened in place. Measure to ensure it's square. If both of those items are good, verify the current pinion angle to see where you're at (& if it needs adjusting).

chopped68 · 02-25-2010, 02:13 AM

what tires were on it before and what are on it now?do the ladder bars have an adjustment on the bottom tube near the axle.if so,make sure they are adjusted equally to start with.is there multiple mounting holes for the ladder bars on the frame(normally there are 3).check to make sure the are mounted correctly.this might be a shot in the dark but as far as the tires,sidewall thickness between the 2 different tires could be a possibilty.hope this helps.

ken

drag_72 · 02-25-2010, 03:22 PM

it had sportsman pro's but now it has sportsman S/R radials the tire size is 31x18 thanks i will check it out

basemodel67 · 02-25-2010, 04:48 PM

Does it still have a panhard bar on it? I think that's what keeps the rear from having side to side movement, but I'm also not very smart...

drag_72 · 02-25-2010, 09:05 PM

yeah its gotta aftermarket one but its a lil loose?? im gonna tighten it and see what that does

72 SUPER10 · 02-26-2010, 01:05 AM

check your center to center of front spindle to rear center axle, also check the roll out of your tires using a seamstress tape . another thing could be the shock bottoming out or shock adjustment,or weak spring,good luck,vince.

02-24-2010, 10:13 PM	#1
drag_72 Ready to go fast!! Join Date: Aug 2008 Location: Carthage,Mo Posts: 219	Hellpp! i got a 72 chevy shortbed pro street truck... ladder bars, coil overs, narrowed 9 inch... the whole nine. for some damn reason when i get on it the ass end shimmys back and forth?? i really need some help on this. the truck didnt do it until the guy before me changed the tires?? but he said he messed with the pinion angle and it got better? but its still really bad. i wanna get it lined out before i take it to the track __________________ 454 block .30 forged aluminum pistons steel crank valve job Holley Strip Dominator intake 1030cfm holley carb, 250 plate shot roller rockers Erson Solid cam split duration 307/310. .575/.595 lift milodon oil pan fab. aluminum valve covers 4 bolt main splayed anodized caps all studded

02-25-2010, 12:43 AM	#2
SCOTI Registered User Join Date: Apr 2001 Location: DALLAS,TX Posts: 22,064	Re: Hellpp! Start w/the basics.... Make sure everything is properly fastened in place. Measure to ensure it's square. If both of those items are good, verify the current pinion angle to see where you're at (& if it needs adjusting). __________________ 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.*

02-25-2010, 02:13 AM	#3
chopped68 Registered User Join Date: Dec 2009 Location: stanton, california Posts: 74	Re: Hellpp! what tires were on it before and what are on it now?do the ladder bars have an adjustment on the bottom tube near the axle.if so,make sure they are adjusted equally to start with.is there multiple mounting holes for the ladder bars on the frame(normally there are 3).check to make sure the are mounted correctly.this might be a shot in the dark but as far as the tires,sidewall thickness between the 2 different tires could be a possibilty.hope this helps. ken

02-25-2010, 03:22 PM	#4
drag_72 Ready to go fast!! Join Date: Aug 2008 Location: Carthage,Mo Posts: 219	Re: Hellpp! it had sportsman pro's but now it has sportsman S/R radials the tire size is 31x18 thanks i will check it out __________________ 454 block .30 forged aluminum pistons steel crank valve job Holley Strip Dominator intake 1030cfm holley carb, 250 plate shot roller rockers Erson Solid cam split duration 307/310. .575/.595 lift milodon oil pan fab. aluminum valve covers 4 bolt main splayed anodized caps all studded

02-25-2010, 04:48 PM	#5
basemodel67 Factory Strippers Rule! Join Date: Mar 2009 Location: Shingle Springs, CA Posts: 707	Re: Hellpp! Does it still have a panhard bar on it? I think that's what keeps the rear from having side to side movement, but I'm also not very smart... __________________ "Feast your eyes on a feast of smoke." 67 Chevy Short Fleet PLAN: LQ9, 4L60, D60 Looking for School Bus Gauges - Help me out!

02-25-2010, 09:05 PM	#6
drag_72 Ready to go fast!! Join Date: Aug 2008 Location: Carthage,Mo Posts: 219	Re: Hellpp! yeah its gotta aftermarket one but its a lil loose?? im gonna tighten it and see what that does __________________ 454 block .30 forged aluminum pistons steel crank valve job Holley Strip Dominator intake 1030cfm holley carb, 250 plate shot roller rockers Erson Solid cam split duration 307/310. .575/.595 lift milodon oil pan fab. aluminum valve covers 4 bolt main splayed anodized caps all studded

02-26-2010, 01:05 AM	#7
72 SUPER10 Registered User Join Date: Nov 2008 Location: LUCEDALE MS. Posts: 157	Re: Hellpp! check your center to center of front spindle to rear center axle, also check the roll out of your tires using a seamstress tape . another thing could be the shock bottoming out or shock adjustment,or weak spring,good luck,vince. __________________ http://i648.photobucket.com/albums/u...Picture008.jpg



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