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#1
08-12-2002, 11:33 AM
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Just bought a 65 Cat I drove it on the highway a few times and noticed on certain areas of the highway the rearend of my cat bounces and hops like crazy, almost like having someone jump on a water bed while your laying on it, its real bad. what would cause it to do this and is it repairable? any help or ideas is appreciated.
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#2
08-12-2002, 11:33 AM
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Just bought a 65 Cat I drove it on the highway a few times and noticed on certain areas of the highway the rearend of my cat bounces and hops like crazy, almost like having someone jump on a water bed while your laying on it, its real bad. what would cause it to do this and is it repairable? any help or ideas is appreciated.
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#3
08-12-2002, 11:52 AM
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what you're describing sounds like worn out rear shocks. bounce the rear of the car a few times and then step back and watch the car's reaction. if it bounces more than once the shocks are getting weak.
mike [ August 12, 2002, 11:53 AM: Message edited by: mike nixon ]
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so many pontiacs, so little time.................. moderator is a glorified word for an unappreciated prick.................. "Only two things are infinite, the universe and human stupidity, and I'm not sure about the former." --Albert Einstein "There is no such thing as a good tax." "We contend that for a nation to tax itself into prosperity is like a man standing in a bucket and trying to lift himself up by the handle." - Winston Churchill |
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#4
08-13-2002, 01:49 AM
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If the shocks arent it try to see if theres a bulge in one of the tires, my cousin has a 69 Catalina and had the same thing happening, one of his rear tires had a big bulge in it from hitting a pothole we figured. Hope you figure it out!
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 1970 GTO 458 CID .040 over 4 Bolt 428 Block, Forged Eagle 455 Crank, 295 CFM SD KRE D-Ports, SD Old Faithful HR Cam + Comp HR Lifters, PPR Maxx-lite rods, Racetec pistons, PRW 1.65 SS Rockers, 900CFM Holley HP TBI, Performer RPM, Hooker Super Comps, 3" X-Pipe into 2.5" mufflers/tailpipes, 2.75 1st TH400, Continental 13" Converter, 8.5" 3.08 Posi. Everything installed, fired up and tuning has begun! |
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#5
08-13-2002, 01:38 PM
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Its weird because it only seems to hop on certain spans of the highway, the rearend will start to bounce and then it gets real bad and seems to bounce hard for days and then when i get off the section of span it will settle down to normal. so it only lasts for a min or so just long enough to get of the section of road. i have air shocks in the back and did try to put air in them to see if this helped but the air leaked out. could not having any air in the shocks cause this too? or does it matter?
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#6
08-13-2002, 01:39 PM
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i'll look for bulges in the tires also.
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#7
08-13-2002, 05:06 PM
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Air shocks are dead shocks with out air.
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#8
08-13-2002, 10:15 PM
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that could be my problem i'll look into it
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#9
08-14-2002, 03:59 AM
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i bounced the rearend as mike nixon stated and it bounced like 4-5 times so i take it there bad but does it matter if there is air in the shocks or not when i do this?
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#10
08-14-2002, 05:44 AM
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"i have air shocks in the back and did try to put air in them to see if this helped but the air leaked out. could not having any air in the shocks cause this too?"
Like I said air shocks with no air act like dead shocks.If it's the lines that are leaking, that can be fixed,if the shocks themselves are leaking replace them with a set of 50/50 gas shocks and I think you will be very happy.( especialy with the latter). |
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#11
08-14-2002, 10:02 AM
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I have had this happen when a wheel/tire was badly out of balance. You hit a bump or something in the road and it feels like a basketball dribbling on the highway.
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A bad day fishing beats any day working! 
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#12
08-14-2002, 02:25 PM
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i'll put air in the shocks again and spray some GP to see if i can see where the leaks are coming from if its the shocks i'll get a pair of 50/50 gas shocks as stated. thanks for the help!
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#13
08-14-2002, 02:26 PM
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definitely have the highway basketball dribble down. lol
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#14
09-01-2002, 03:46 AM
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I had a problem with vibration at certain speeds and after balancing or replacing most everything in the drivetrain, it boiled down to getting my driveshaft rebalanced. I ruled it out, since it had never been damaged, but for whatever reason, it was out. The car is now smooth as silk at any speed.
-Mike
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I'm trying to figure out why dumping money in to this car and burning ungodly amounts of time and energy on it is fun...but it is! |
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