Any help/ideas of bouncing puller?? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

mudmizer · 02-18-2011, 01:06 AM

I have been trying to get the bounce out of my puller and have had a some success, but anyone have any help/ideas.
Rear is locked solid for the pulls. Rear axle has ladder bars. Hitch runs solid to the frame just under cab rear. Front springs are clamped to reduce spring wrap with torqe arms to the center of the frame. Running 35 inch BFSs with 60 psi. Truck runs in 4500-5500lb class and I weigh 5480lbs. I am not allowed to hang any weight on the front even if I droped weight somewhere. I have gotten a few 1st, but more broken parts than places. The biggest problem is it's short wheelbase. Due to the hop I have to get on and off the gas and I loose momentum. I'm thinking of a shorter tire for less side wall. 33s?? have 4:56 gears.

YouTube - Chevy

rayfinseats · 02-18-2011, 02:10 AM

How about limiting straps on the front end? I'd play with raising or lowering the hitch. Get a slow motion side video? I'm an old drag racer.

royo · 02-18-2011, 07:14 AM

Have you put any heavy weights on the front yet

propanemudtruck · 02-18-2011, 07:50 AM

I've never done any pulling to say so (do stuck trucks and tractors count?) But relating to test hill at the dunes, most people get bouncing like that because of tire pressure. Why 60 psi? COuld you try 30 or so and see if you get better results? With less pressure you'll increase your traction too...
Good luck and that's a nice truck you've got!

mudmizer · 02-19-2011, 12:53 AM

I'm not allowed to add weight in my class, so I can't hang any. My hitch is ajustable and I have wanted to try that, I'm running it at 26" now thats the max allowed. If I drop the height then I will drag more of the sled than carry it. I run 60 lbs on the tires because I have tried various pressures and the lower the pressure, the more sidewall flex and bounce thats why I'm thinking a shorter tire = less side wall flex/spongyness and less hop. I should then be able to run less pressure. I have tried limiting straps on the front, actually chaining it down by pulling the axle to the frame about three inches of compression. With only about 5 pulls a year around here it is hard getting it dialed in.

Here are a couple from the side, if they will help diagnose.

http://www.youtube.com/watch?v=3NgkO...embedded#at=42

chas350 · 02-19-2011, 12:27 PM

Frame flex/twist?

tomtuna1978 · 02-19-2011, 02:17 PM

looks like most of the hop is comming from the front susp. .... do u have the stock leif springs up there ? if so do the rules say tht you can 4 link it ? id try that and/or some 56 in springs or diff shock valving. also i ws thinking with all that bouncing the floats in the carb must be bouncing also ... and maybe swpping to fuel injection would help with the (if thats cusing sputter and or fuel slosh) bouncing. thats just my 2cents

02-18-2011, 02:10 AM	#2
rayfinseats Registered User Join Date: Dec 2010 Location: sioux city, iowa Posts: 619	Re: Any help/ideas of bouncing puller?? How about limiting straps on the front end? I'd play with raising or lowering the hitch. Get a slow motion side video? I'm an old drag racer. Last edited by rayfinseats; 02-18-2011 at 02:13 AM.

02-18-2011, 07:14 AM	#3
royo Registered User Join Date: Feb 2007 Location: knoxville tn Posts: 1,013	Re: Any help/ideas of bouncing puller?? Have you put any heavy weights on the front yet __________________ nickle and dime

02-18-2011, 07:50 AM	#4
propanemudtruck Local Redneck Authority Join Date: Mar 2009 Location: Grand Rapids, MI Posts: 584	Re: Any help/ideas of bouncing puller?? I've never done any pulling to say so (do stuck trucks and tractors count?) But relating to test hill at the dunes, most people get bouncing like that because of tire pressure. Why 60 psi? COuld you try 30 or so and see if you get better results? With less pressure you'll increase your traction too... Good luck and that's a nice truck you've got! __________________ -Kevin four on the floor feel the beat in your soul movin to the rhythym pumpin til ya cant take no more dance if you want to do what you came to you cant ignore the feeling of that four on the floor

02-19-2011, 12:53 AM	#5
mudmizer Registered User Join Date: Jan 2007 Location: Bellingham, washington Posts: 260	Re: Any help/ideas of bouncing puller?? I'm not allowed to add weight in my class, so I can't hang any. My hitch is ajustable and I have wanted to try that, I'm running it at 26" now thats the max allowed. If I drop the height then I will drag more of the sled than carry it. I run 60 lbs on the tires because I have tried various pressures and the lower the pressure, the more sidewall flex and bounce thats why I'm thinking a shorter tire = less side wall flex/spongyness and less hop. I should then be able to run less pressure. I have tried limiting straps on the front, actually chaining it down by pulling the axle to the frame about three inches of compression. With only about 5 pulls a year around here it is hard getting it dialed in. Here are a couple from the side, if they will help diagnose. http://www.youtube.com/watch?v=3NgkO...embedded#at=42 __________________ 68 4x4, 454, 4 speed, disk brakes both ends, Sold my 69 SS396 Elcamino when young & stupid

02-19-2011, 12:27 PM	#6
chas350 Registered User Join Date: Mar 2007 Location: Connecticut Posts: 581	Re: Any help/ideas of bouncing puller?? Frame flex/twist? __________________ "I'll Procrastinate Tomorrow" quote by LEEVON 71 K10 long fleet (sons truck) new 370hp 355, sm465 np205, 3.73's 33's 70 K20 long fleet 98 G3500 work van

02-19-2011, 02:17 PM	#7
tomtuna1978 Registered User Join Date: Apr 2009 Location: Bend,Oregon Posts: 225	Re: Any help/ideas of bouncing puller?? looks like most of the hop is comming from the front susp. .... do u have the stock leif springs up there ? if so do the rules say tht you can 4 link it ? id try that and/or some 56 in springs or diff shock valving. also i ws thinking with all that bouncing the floats in the carb must be bouncing also ... and maybe swpping to fuel injection would help with the (if thats cusing sputter and or fuel slosh) bouncing. thats just my 2cents



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