# Rear end bounces when tires spin? **URL:** \ **Category:** SON240sx Automotive\ **Created:** [June 1, 2004, 3:17pm UTC](https://forums.speedlife.net/t/rear-end-bounces-when-tires-spin/81080 "2004-06-01T15:17:16Z")\ **Posts on this page:** 20\ **Page:** 1
**Author:** ![Calvin](https://avatars.discourse-cdn.com/v4/letter/c/f475e1/32.png) [@Calvin](https://forums.speedlife.net/u/Calvin)\ **Post date:** [June 1, 2004, 3:17pm UTC](https://forums.speedlife.net/t/rear-end-bounces-when-tires-spin/81080/1 "2004-06-01T15:17:16Z")
Hey, I was at the track with drag radials on my car, and when I went up to warm up the tires and the rear end bounced around like crazy… is there some kind of stablizer kit I can get? 1992 240sx…hoping to hear from someone who has had this problem!?! Thanks Guys! Calvin ---
**Author:** ![Black240Matt](https://avatars.discourse-cdn.com/v4/letter/b/4bbf92/32.png) [@Black240Matt](https://forums.speedlife.net/u/Black240Matt)\ **Post date:** [June 1, 2004, 3:20pm UTC](https://forums.speedlife.net/t/rear-end-bounces-when-tires-spin/81080/2 "2004-06-01T15:20:35Z")
what kinda suspension u got? ---
**Author:** ![AnDrEw](https://avatars.discourse-cdn.com/v4/letter/a/f19dbf/32.png) [@AnDrEw](https://forums.speedlife.net/u/AnDrEw)\ **Post date:** [June 1, 2004, 3:21pm UTC](https://forums.speedlife.net/t/rear-end-bounces-when-tires-spin/81080/3 "2004-06-01T15:21:47Z")
could be shocks are blown. Was it just weel hop? If so, there are subframe collers you guy buy that help get rid of wheel hop. Talk to “Shift\_sr20det (Adam).” He knows of good ones. Andrew. ---
**Author:** ![Calvin](https://avatars.discourse-cdn.com/v4/letter/c/f475e1/32.png) [@Calvin](https://forums.speedlife.net/u/Calvin)\ **Post date:** [June 2, 2004, 3:22am UTC](https://forums.speedlife.net/t/rear-end-bounces-when-tires-spin/81080/4 "2004-06-02T03:22:50Z")
I have stock suspension in the rear ---
**Author:** ![system](https://canada1.discourse-cdn.com/flex034/uploads/speedlife/original/2X/b/b7170c8eddc0b95ece6b88172b2f416a08489a45.png) [@system](https://forums.speedlife.net/u/system)\ **Post date:** [June 2, 2004, 5:58am UTC](https://forums.speedlife.net/t/rear-end-bounces-when-tires-spin/81080/5 "2004-06-02T05:58:14Z")
well that is your problem, I can almost positively tell you that you struts are shot or on there way. ---
**Author:** ![Axlerod](https://avatars.discourse-cdn.com/v4/letter/a/8edcca/32.png) [@Axlerod](https://forums.speedlife.net/u/Axlerod)\ **Post date:** [June 2, 2004, 7:56am UTC](https://forums.speedlife.net/t/rear-end-bounces-when-tires-spin/81080/6 "2004-06-02T07:56:59Z")
Lots of cars wheel hop when you have sticky tires. Doesn’t mean your suspension is gone. The RX-8 does it, even a new Mazda3 will do it. Just means the tires haven’t quite broken loose, and they’re not quite sticking. What do these collars do anyways? ---
**Author:** ![Gonad](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/gonad/32/5481_2.png) [@Gonad](https://forums.speedlife.net/u/Gonad)\ **Post date:** [June 2, 2004, 8:14am UTC](https://forums.speedlife.net/t/rear-end-bounces-when-tires-spin/81080/7 "2004-06-02T08:14:42Z")
The collars (or subframe spacers) preload your rear subframe. If you look at your rear subframe, the 4 crucial points where the subframe hooksup to your main frame there is a gap. Normally there is a rubber bushing there but overtime it wears out and doesn’t do much. The collars just close the gap to prevent the subframe from moving up and down (which is wheelhop). ---
**Author:** ![iQuAGoD](https://avatars.discourse-cdn.com/v4/letter/i/f05b48/32.png) [@iQuAGoD](https://forums.speedlife.net/u/iQuAGoD)\ **Post date:** [June 2, 2004, 8:18am UTC](https://forums.speedlife.net/t/rear-end-bounces-when-tires-spin/81080/8 "2004-06-02T08:18:15Z")
The collars stiffen up the worn subframe bushings by squishing them down This usually helps eliminate wheel hop ---
**Author:** ![Gonad](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/gonad/32/5481_2.png) [@Gonad](https://forums.speedlife.net/u/Gonad)\ **Post date:** [June 2, 2004, 8:33am UTC](https://forums.speedlife.net/t/rear-end-bounces-when-tires-spin/81080/9 "2004-06-02T08:33:28Z")
> [@iQuABoB](#): > > The collars stiffen up the worn subframe bushings by squishing them down > > This usually helps eliminate wheel hop Thank you Captain Echo. But anywho, if you are cheap, what you can do is go to a hardware store and buy a bunch of washers (I figure what diameter/size you need). Stack the washers together and put them where you normally put the collars/spacers. Should make for a cheap mod. ---
**Author:** ![Calvin](https://avatars.discourse-cdn.com/v4/letter/c/f475e1/32.png) [@Calvin](https://forums.speedlife.net/u/Calvin)\ **Post date:** [June 2, 2004, 3:10pm UTC](https://forums.speedlife.net/t/rear-end-bounces-when-tires-spin/81080/10 "2004-06-02T15:10:35Z")
I want to try out these subframe collars where can I pick them up…do I have to go to a preformance shop or can I just go to like part source or ct??? and do they have them for specific vehicals or do I have to take the measurments? Thanks for everybodys help?? ---
**Author:** ![iQuAGoD](https://avatars.discourse-cdn.com/v4/letter/i/f05b48/32.png) [@iQuAGoD](https://forums.speedlife.net/u/iQuAGoD)\ **Post date:** [June 2, 2004, 3:27pm UTC](https://forums.speedlife.net/t/rear-end-bounces-when-tires-spin/81080/11 "2004-06-02T15:27:31Z")
Shops like [www.splparts.com](http://www.splparts.com) or [www.phase2motortrend.com](http://www.phase2motortrend.com) carry them Gonad, you posted while I was typing, eat me. ---
**Author:** ![Calvin](https://avatars.discourse-cdn.com/v4/letter/c/f475e1/32.png) [@Calvin](https://forums.speedlife.net/u/Calvin)\ **Post date:** [June 2, 2004, 7:54pm UTC](https://forums.speedlife.net/t/rear-end-bounces-when-tires-spin/81080/12 "2004-06-02T19:54:13Z")
Thanks guys, hey by chance does anybody have just one top and bottom subframe bushing?? just curious be cause if I could get my hands on just one or get dimensions I could make my own. ---
**Author:** ![Gonad](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/gonad/32/5481_2.png) [@Gonad](https://forums.speedlife.net/u/Gonad)\ **Post date:** [June 2, 2004, 8:10pm UTC](https://forums.speedlife.net/t/rear-end-bounces-when-tires-spin/81080/13 "2004-06-02T20:10:29Z")
I have the PDM subframe spacers. I have it only on the bottom for both front and back of the subframe. Seems to be effective and working good. ---
**Author:** ![Calvin](https://avatars.discourse-cdn.com/v4/letter/c/f475e1/32.png) [@Calvin](https://forums.speedlife.net/u/Calvin)\ **Post date:** [June 3, 2004, 10:08am UTC](https://forums.speedlife.net/t/rear-end-bounces-when-tires-spin/81080/14 "2004-06-03T10:08:39Z")
any chance someone has a set of subframe spacers that are accesable for measuring??? ---
**Author:** ![Gonad](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/gonad/32/5481_2.png) [@Gonad](https://forums.speedlife.net/u/Gonad)\ **Post date:** [June 3, 2004, 3:07pm UTC](https://forums.speedlife.net/t/rear-end-bounces-when-tires-spin/81080/15 "2004-06-03T15:07:20Z")
The smaller one can have a slit so it can slide in easily on the upper parts of the subframe. I did these a while back but forgot to post the pic somewhere. ![http://240sx.cubicdesign.com/images/misc/whitelinespacersspecs.jpg](http://240sx.cubicdesign.com/images/misc/whitelinespacersspecs.jpg) ---
**Author:** ![Calvin](https://avatars.discourse-cdn.com/v4/letter/c/f475e1/32.png) [@Calvin](https://forums.speedlife.net/u/Calvin)\ **Post date:** [June 3, 2004, 4:18pm UTC](https://forums.speedlife.net/t/rear-end-bounces-when-tires-spin/81080/16 "2004-06-03T16:18:43Z")
Thanks alot I’m gonna try those out! ---
**Author:** ![Gonad](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/gonad/32/5481_2.png) [@Gonad](https://forums.speedlife.net/u/Gonad)\ **Post date:** [June 3, 2004, 5:18pm UTC](https://forums.speedlife.net/t/rear-end-bounces-when-tires-spin/81080/17 "2004-06-03T17:18:54Z")
The diagram I posted is for the PDM subframe spacers. They are not the collars. The collars are pretty much half those (in a way) and you put two on either end of the subframe bolt. ---
**Author:** ![Gonad](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/gonad/32/5481_2.png) [@Gonad](https://forums.speedlife.net/u/Gonad)\ **Post date:** [June 3, 2004, 5:43pm UTC](https://forums.speedlife.net/t/rear-end-bounces-when-tires-spin/81080/18 "2004-06-03T17:43:04Z")
The PDM ones are polyurethane. They are only meant to be used on either the top or bottom. Depending on how you use them, you can do it for more traction, performance or drifting. I’ve had it on all around performance setting and it’s fine. ---
**Author:** ![Calvin](https://avatars.discourse-cdn.com/v4/letter/c/f475e1/32.png) [@Calvin](https://forums.speedlife.net/u/Calvin)\ **Post date:** [June 8, 2004, 12:03pm UTC](https://forums.speedlife.net/t/rear-end-bounces-when-tires-spin/81080/19 "2004-06-08T12:03:00Z")
but they will fix the wheel hop?? ---
**Author:** ![Gonad](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/gonad/32/5481_2.png) [@Gonad](https://forums.speedlife.net/u/Gonad)\ **Post date:** [June 8, 2004, 3:52pm UTC](https://forums.speedlife.net/t/rear-end-bounces-when-tires-spin/81080/20 "2004-06-08T15:52:08Z")
> [@Calvin](#): > > but they will fix the wheel hop?? Yes. [Next page](https://forums.speedlife.net/t/rear-end-bounces-when-tires-spin/81080.md?page=2)