Trim rear bump stops? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Frkypunk70 · 06-10-2011, 02:24 PM

Hey, I have a 70 cst with a 4.5/6 drop. There is no c-notch but I did put shock relocaters and GR-2's on. I notice it does not have alot of travel till it hits the bumpstops on the rear. Should I cut an inch off them? Just wondering what you guys did. Thanks Tim

Frkypunk70 · 06-10-2011, 02:37 PM

Sorry I should probably clarify I have about an inch before they hit now so what would be the ideal amount? Thank You

doosekoop · 06-10-2011, 07:19 PM

Quote:

Originally Posted by Frkypunk70

Sorry I should probably clarify I have about an inch before they hit now so what would be the ideal amount? Thank You

Thats a good question , how much travel should one expect from a decent suspension and how much bump stop is enough to prevent metal on metal contact. since we dont really haul a bunch what is ideal??

TubbedII: i would recomend at least some bump stops just to prevent metal contact which could result in cracks eventually resulting in catastrophic failure ( and we dont want that)!

Frkypunk70 · 06-10-2011, 09:14 PM

I'm really suprised no one has come to clarify this. Considering I did a search on it and the was'nt any info on what to do with rear bump stops. I think this would be good info for those of us without c-notches.

ItsRandy · 06-11-2011, 01:10 AM

Quote:

Originally Posted by Frkypunk70

I'm really suprised no one has come to clarify this. Considering I did a search on it and the was'nt any info on what to do with rear bump stops. I think this would be good info for those of us without c-notches.

I trimmed mine. I now have about 1/2" pads. Didn't net much more travel but when it did bottom out it didn't sound like I was breaking parts.

tubbedII · 06-10-2011, 02:52 PM

I didn't have any bump stops in at all with my 4/6. I bottomed out on the frame twice on big bumps though...

**lolife99** · 06-11-2011, 10:23 AM

I usually just remove them totally.
You could start by trimming 1" off and seeing how you like it.

**N2TRUX** · 06-11-2011, 11:12 AM

Quote:

Originally Posted by lolife99

I usually just remove them totally.
You could start by trimming 1" off and seeing how you like it.

I agree. The factory stop is too tall. Remove it and mount a small button style stop above the axle.

iceship · 07-02-2011, 08:30 PM

I just did my flip a few days ago....... it is about 6 or 7in...... I did the 2in drop shakle first but after the drop the shakles don't lean back like it did...... so I'm guessing I have a 6... rear end is setting right on the bump stop, have not bought any drop shocks yet...... on 2.5 spindles in front.... don't look to bad

Just alittle low in the back

iceship · 07-02-2011, 08:31 PM

O, by the way no c-notch

LONGHAIR · 07-03-2011, 08:04 AM

There probably haven't been to many answers because it's rather subjective.
"It depends" upon what you feel is acceptable...
What are the roads like in your area?
LWB or short?
Ever carry anything?
How hard are you willing to let it "feel"?
Etc....

I wouldn't remove them totally though. Maybe cut them in half and test it?
Add a small notch?... it's not that hard to do.

iceship · 07-03-2011, 01:05 PM

Roads are not that bad in some areas
Long wheel base
I load it once every blue moon
Id like it all to be gone but I know that is not going to happen, thinking of going with air shocks..

19seventeeCustom · 07-03-2011, 01:34 PM

I removed mine completely, and I have hit the bed rails on the axle tube on a large dip/bump in the road.

I'm still debating a notch, just don't know if I wanna cut into the truck.....

iceship · 07-03-2011, 01:45 PM

I had to do some cutting if I removed it completly.... that part right there has to be trimmed

LONGHAIR · 07-03-2011, 02:44 PM

That will definitely ride bad. The only "suspension" you would have there is the sidewall of the tires themselves.......not much.

You really should do something about cutting that stop and probably notching the frame too. It's not just sitting on the stop, it's smashing into it.

iceship · 07-05-2011, 01:02 PM

I trimed bump stop and put old shackles on....... rides better , going to get shocks some time another...

6772owner · 07-05-2011, 02:16 PM

I have bags, no notch and I trimmed my bumpstops to about a 1/4" below the frame rail. I have never had any issues hitting the stops/frame yet, but it could be because I run the bags at 25-28 psi for my ride height. Id have to measure the clearence to my axle but I would guess its about 2" +/- at ride height.

thefalconer_88 · 03-02-2016, 12:59 AM

I'm having a similar issue with my 63 lwb c20 with unkown drop springs, and 2 inch blocks. I have 1" of clearance before the stop hits the axle... I guess I'll just cut them down for now. What's the best way to cut thick rubber?

6772owner · 03-02-2016, 11:17 AM

I honestly cant remember how I cut mine, probably a sawzall or cut off wheel(?)

**VictoriaHardware** · 03-02-2016, 09:30 PM

A band saw works perfect. Then finish with a belt sander.

Andy4639 · 03-03-2016, 03:06 AM

I cut mine just so they would hit the stop before the metal to metal hit. That in my mind is where you want it. You want as much travel out of it as possible without hitting under normal driving.
Take your wheels off and look into the wheel well at the bump stops and mark then just 1/8" lower than the frame. This want keep it from hitting metal to metal but it will soften the impact when it does.

06-10-2011, 02:24 PM	#1
Frkypunk70 Registered User Join Date: Mar 2010 Location: Scranton,Pa Posts: 423	Trim rear bump stops? Hey, I have a 70 cst with a 4.5/6 drop. There is no c-notch but I did put shock relocaters and GR-2's on. I notice it does not have alot of travel till it hits the bumpstops on the rear. Should I cut an inch off them? Just wondering what you guys did. Thanks Tim __________________ "When I die, I want to go peacefully like my Grandfather did, in his sleep -- not screaming, like the passengers in his car. "

06-10-2011, 02:37 PM	#2
Frkypunk70 Registered User Join Date: Mar 2010 Location: Scranton,Pa Posts: 423	Re: Trim rear bump stops? Sorry I should probably clarify I have about an inch before they hit now so what would be the ideal amount? Thank You __________________ "When I die, I want to go peacefully like my Grandfather did, in his sleep -- not screaming, like the passengers in his car. "

06-10-2011, 09:14 PM	#4
Frkypunk70 Registered User Join Date: Mar 2010 Location: Scranton,Pa Posts: 423	Re: Trim rear bump stops? I'm really suprised no one has come to clarify this. Considering I did a search on it and the was'nt any info on what to do with rear bump stops. I think this would be good info for those of us without c-notches. __________________ "When I die, I want to go peacefully like my Grandfather did, in his sleep -- not screaming, like the passengers in his car. "

06-10-2011, 02:52 PM	#6
tubbedII needs more $$$ Join Date: Mar 2004 Location: Sacramento Posts: 1,936	Re: Trim rear bump stops? I didn't have any bump stops in at all with my 4/6. I bottomed out on the frame twice on big bumps though... __________________ 1970 2wd Blazer

06-11-2011, 10:23 AM	#7
lolife99 67-72 parts collector,… Join Date: Nov 2002 Location: Mid-MO Posts: 22,700	Re: Trim rear bump stops? I usually just remove them totally. You could start by trimming 1" off and seeing how you like it. __________________ Keith Convert to disc brakes. http://67-72chevytrucks.com/vboard/s...d.php?t=444823

07-02-2011, 08:30 PM	#9
iceship Registered User Join Date: Apr 2011 Location: bowling green, ky Posts: 439	Re: Trim rear bump stops? I just did my flip a few days ago....... it is about 6 or 7in...... I did the 2in drop shakle first but after the drop the shakles don't lean back like it did...... so I'm guessing I have a 6... rear end is setting right on the bump stop, have not bought any drop shocks yet...... on 2.5 spindles in front.... don't look to bad Just alittle low in the back

07-02-2011, 08:31 PM	#10
iceship Registered User Join Date: Apr 2011 Location: bowling green, ky Posts: 439	Re: Trim rear bump stops? O, by the way no c-notch

07-03-2011, 01:05 PM	#12
iceship Registered User Join Date: Apr 2011 Location: bowling green, ky Posts: 439	Re: Trim rear bump stops? Roads are not that bad in some areas Long wheel base I load it once every blue moon Id like it all to be gone but I know that is not going to happen, thinking of going with air shocks..

07-03-2011, 01:34 PM	#13
19seventeeCustom Registered User Join Date: Mar 2010 Location: Downtown Posts: 573	Re: Trim rear bump stops? I removed mine completely, and I have hit the bed rails on the axle tube on a large dip/bump in the road. I'm still debating a notch, just don't know if I wanna cut into the truck.....

07-03-2011, 01:45 PM	#14
iceship Registered User Join Date: Apr 2011 Location: bowling green, ky Posts: 439	Re: Trim rear bump stops? I had to do some cutting if I removed it completly.... that part right there has to be trimmed

07-05-2011, 01:02 PM	#16
iceship Registered User Join Date: Apr 2011 Location: bowling green, ky Posts: 439	Re: Trim rear bump stops? I trimed bump stop and put old shackles on....... rides better , going to get shocks some time another...

07-05-2011, 02:16 PM	#17
6772owner Gearhead Join Date: Jan 2008 Location: Colorado Posts: 1,193	Re: Trim rear bump stops? I have bags, no notch and I trimmed my bumpstops to about a 1/4" below the frame rail. I have never had any issues hitting the stops/frame yet, but it could be because I run the bags at 25-28 psi for my ride height. Id have to measure the clearence to my axle but I would guess its about 2" +/- at ride height. __________________ 2002 Saturn SL2, My D/D 2019 Ford Fusion SE, Ecoboost - Wife's D/D 1993 Camaro Z28, A4, CAI, Cat-Back Exhaust Project C10 (my 72' C10 w/96' LT1, 700R4, bagged F&R, 18's (for now), Short/Fleet) -- SOLD! Build Thread: http://67-72chevytrucks.com/vboard/s...d.php?t=313644

03-02-2016, 12:59 AM	#18
thefalconer_88 Registered User Join Date: May 2015 Location: United States Posts: 81	Re: Trim rear bump stops? I'm having a similar issue with my 63 lwb c20 with unkown drop springs, and 2 inch blocks. I have 1" of clearance before the stop hits the axle... I guess I'll just cut them down for now. What's the best way to cut thick rubber?

03-02-2016, 11:17 AM	#19
6772owner Gearhead Join Date: Jan 2008 Location: Colorado Posts: 1,193	Re: Trim rear bump stops? I honestly cant remember how I cut mine, probably a sawzall or cut off wheel(?) __________________ 2002 Saturn SL2, My D/D 2019 Ford Fusion SE, Ecoboost - Wife's D/D 1993 Camaro Z28, A4, CAI, Cat-Back Exhaust Project C10 (my 72' C10 w/96' LT1, 700R4, bagged F&R, 18's (for now), Short/Fleet) -- SOLD! Build Thread: http://67-72chevytrucks.com/vboard/s...d.php?t=313644

03-02-2016, 09:30 PM	#20
VictoriaHardware Senior Member Join Date: Nov 2012 Location: Southeast Michigan Posts: 792	Re: Trim rear bump stops? A band saw works perfect. Then finish with a belt sander. Attached Images



Register or Log In To remove these advertisements.

03-03-2016, 03:06 AM	#21
Andy4639 Old member Join Date: Jan 2002 Location: Liberty, & Garden City S.C. , U.S. Posts: 19,945	Re: Trim rear bump stops? I cut mine just so they would hit the stop before the metal to metal hit. That in my mind is where you want it. You want as much travel out of it as possible without hitting under normal driving. Take your wheels off and look into the wheel well at the bump stops and mark then just 1/8" lower than the frame. This want keep it from hitting metal to metal but it will soften the impact when it does. __________________ 1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs.

Register or Log In To remove these advertisements.