Rear 4" drop, did you c-notch? pics please - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Sid138 · 04-22-2013, 01:16 AM

I measured the top of my rear axle to the bottom of my frame. Travel is 7". Dropping 4" would leave me 3" of travel (not including existing bump stops). Is this enough? With 4" drop, did you notch?

Cris.sanchez3 · 04-22-2013, 01:41 AM

Well I haven't done it yet but I have ordered my springs and its gonna be next weekends project I asked other members and checked other posts and they have done 6" with out notching and say its ok if your not towing or putting weight on the rear. You shouldn't have a problem with 4"
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**lolife99** · 04-22-2013, 06:42 AM

No notch needed.
Don't be surprised if your 4" drop spring result in about 3" lower than you are now.
Your original springs should have at least 1" of sag in them.
Take some before and after measurement to confirm your actual drop.
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PanelDeland · 04-22-2013, 07:00 AM

I didn't notch.I do need to do the shock relo I think.It seems like a speed bump occassionally bumps th bumpstops.I think shock relo will stop that but I may need to trim the BS a bit.It's not bad,just enough to tell.

Sorry I don't have a pic on this puter.

**special-K** · 04-22-2013, 07:33 AM

You can go as much as 6" w/o a notch. At 6" you are close and have to be careful not to hit bump[ stops. I know of a truck with 7" drop/no notch and that is leaf sprung.

James the III · 03-12-2017, 08:35 AM

Quote:

Originally Posted by special-K

You can go as much as 6" w/o a notch. At 6" you are close and have to be careful not to hit bump[ stops. I know of a truck with 7" drop/no notch and that is leaf sprung.

Is that 6" all spring or
4" spring and 2" blocks??
or
5" spring and 1" block?

not that it matter much, just wondering

**GR8-68** · 03-12-2017, 09:08 AM

I have a 2" block and a 4" spring and no c-notch, although I haven't drove mine yet I do not forsee any issues with it. I do plan to go to a 5" spring to get my wheel tucked a little more though and think I will still be fine

Mickm69 · 04-22-2013, 09:32 AM

I just installed ECE 4-in. dropped springs in the rear of my '69 and have no need to notch.
I did need to reposition the shocks though.
Cheers!
Mickm

big_al_71 · 04-22-2013, 11:56 AM

No notch required for 4 inches, not even for a six inch.. Here is a pict from when my truck had a 4/6 drop kit from Early classics and it may have bottomed out once in three years. If you are going to carry substantial weight then maybe if not you will be fine.

Sid138 · 04-24-2013, 09:44 AM

Ok, thanks. I called a few places including Classic Parts last week just to find the best deal on spindles for the front and coils for the rear. I was asking about drop kits and pricing everything I would need, and a sales rep said that a c-notch was "required" to drop 4" or more. I'm not sure that I've ever heard of anyone c notching unless they're really slamming their truck, so this sort of caught me off guard.

And then I received a Brother's catalog the next day and they also recommend notching for 4" or more for their kits. I already have a 1" block kit in the rear, so I'm thinking about just adding 3" coils out back, along with shock relocating brackets and adjustable track bar, of course and 2.5" spindles in front.

Just wanted to double check with you guys first to be sure.
The fact is, I refuse to cut open the stereo area in my dash for a CD unit, so I'm going with the "factory" looking stereo with a USB port to operate my MP3 player, so I'm dang sure not gonna cut up my freakin' frame, ya know?

But anyway, Thanks again,
Sid

original-71 · 04-24-2013, 11:15 AM

they say that cause they want to sell you the c-notch kit. you dont need to c-notch i have 6 inch coils and a 1/2 inch block in the rear NO c-notch and NO problems. id rather take the advise from the board members than the advise of a sales person

original-71 · 04-24-2013, 11:19 AM

unless you plan to put some serious weight i wouldnt worry about it or plan to go lower in the future then i would c-notch.

CC69Rat · 04-24-2013, 03:31 PM

^^ Sweet stepper !

One Big Rush · 04-26-2013, 08:37 AM

For those of you who have 4" coils and wanted more drop, how did you go about it? I have a 4" coil in the rear, but the truck needs another 1.5" or so to really make me happy. Are you just using lowering blocks, or did you also add the modified trac bar, shocks, and shock relocating kit?

Thanks

CC69Rat · 04-26-2013, 09:56 AM

Yes, at 5.5" rear you'd need to think about shock relocation and an adjustable track bar. Pinion angle becomes an issue if you're particular about it but some people are fine without adjusting it.

westbrookw · 04-27-2013, 01:59 PM

^^he is absolutely right about pinion angle. I relocated the shocks, put on an adjustable traction bar, and had to shorten the drive shaft.

And thanks sid138. This thing is about 12 years of changing my mind.
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Sid138 · 04-27-2013, 10:05 PM

Quote:

Originally Posted by westbrookw

^^he is absolutely right about pinion angle. I relocated the shocks, put on an adjustable traction bar, and had to shorten the drive shaft.

And thanks sid138. This thing is about 12 years of changing my mind.
Posted via Mobile Device

west, it seems to me your truck is a 12 year result in ultimately making the right decisions.

Ok, I haven't thought about pinion angle or driveshaft length when lowering. Makes sense though, but at what point (inches of drop) do you need to shorten?

westbrookw · 04-28-2013, 07:32 AM

Quote:

Originally Posted by Sid138

west, it seems to me your truck is a 12 year result in ultimately making the right decisions.

Ok, I haven't thought about pinion angle or driveshaft length when lowering. Makes sense though, but at what point (inches of drop) do you need to shorten?

I put the LMC slam kit on that was supposed to be a 4/5 drop. But it only ended up being a 3/4. Pinion angle is not as big a deal lowering it that much, but the drive shaft would not clear the pinion yoke. I believe I had my drive shaft shortened 3/4". As I said earlier, the kit wasn't low enough. I put a 1.5" block in the rear. No adjustments for that. Basically, I lowered the truck with the drivetrain out. So, when I started installing everything, that's where I found the length problem. Like I said, 12 years of changing my mind.
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BugzC10 · 04-28-2013, 09:33 AM

Quote:

Originally Posted by westbrookw

I put the LMC slam kit on that was supposed to be a 4/5 drop. But it only ended up being a 3/4. Pinion angle is not as big a deal lowering it that much, but the drive shaft would not clear the pinion yoke. I believe I had my drive shaft shortened 3/4". As I said earlier, the kit wasn't low enough. I put a 1.5" block in the rear. No adjustments for that. Basically, I lowered the truck with the drivetrain out. So, when I started installing everything, that's where I found the length problem. Like I said, 12 years of changing my mind.
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Is your drive shaft one or two piece?
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bugmasta · 04-28-2013, 12:15 AM

Here is mine with a 4/6 ECE drop kit. No notch needed

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skorpioskorpio · 04-28-2013, 04:25 AM

I always hate these numerical drop threads, it all really depends what you start out as. My Jimmy is getting a mild 12" drop and won't be even close to laying frame... but then again you can practically sit under it now

.

Sid138 · 04-28-2013, 05:11 PM

Quote:

Originally Posted by skorpioskorpio

I always hate these numerical drop threads, it all really depends what you start out as. My Jimmy is getting a mild 12" drop and won't be even close to laying frame... but then again you can practically sit under it now

.

lol,...with 12" of drop in your future, I totally understand now why you hate drop threads..lol. Good luck, brother, and don't forget before and after pics or it never happened!

Can't wait to see it

BigDaddyV · 04-28-2013, 09:41 AM

4/6 drop here also no notch. But it will be diggin pavement soon enough, so I'm adding a deep notch

fastnotch89 · 04-28-2013, 03:46 PM

Do anyone have pictures of the 4/6 drop with a 1.5 lowering blocks?

BugzC10 · 04-28-2013, 04:04 PM

Quote:

Originally Posted by fastnotch89

Do anyone have pictures of the 4/6 drop with a 1.5 lowering blocks?

4" CPP lowering springs, plus 1.5" blocks plus .25" plate for The Gearbox Garage extended panbar.

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04-22-2013, 01:16 AM	#1
Sid138 Registered User Join Date: Mar 2012 Location: Valdese, NC Posts: 90	Rear 4" drop, did you c-notch? pics please I measured the top of my rear axle to the bottom of my frame. Travel is 7". Dropping 4" would leave me 3" of travel (not including existing bump stops). Is this enough? With 4" drop, did you notch? __________________ 1972 C/10 short step, 327/TH350, Blue Print H8002k Aluminum heads, 268 Lunati Voodoo cam, Lunati lifters, valve springs, roller rockers and Summit Racing dbl roller timing chain, Holley 670 Street Avenger dual line carb, Edelbrock RPM Air Gap intake, Summit ceramic coated long tube headers, Flowmasters, 3:73 gear, 15x10 Wheel Vintique Rallys w/ 295/50 front and rear, 2/4 drop, Custom Sound Head unit, Alpine amp, Fosgate Punch P3, Kenwood 6x9 in the doors, Grant GT w/tilt, B&M MegaShifter...etc

04-22-2013, 01:41 AM	#2
Cris.sanchez3 Registered User Join Date: Feb 2011 Location: Burleson, TX Posts: 64	Re: Rear 4" drop, did you c-notch? pics please Well I haven't done it yet but I have ordered my springs and its gonna be next weekends project I asked other members and checked other posts and they have done 6" with out notching and say its ok if your not towing or putting weight on the rear. You shouldn't have a problem with 4" Posted via Mobile Device

04-22-2013, 06:42 AM	#3
lolife99 67-72 parts collector,… Join Date: Nov 2002 Location: Mid-MO Posts: 22,691	Re: Rear 4" drop, did you c-notch? pics please No notch needed. Don't be surprised if your 4" drop spring result in about 3" lower than you are now. Your original springs should have at least 1" of sag in them. Take some before and after measurement to confirm your actual drop. Posted via Mobile Device __________________ Keith Convert to disc brakes. http://67-72chevytrucks.com/vboard/s...d.php?t=444823

04-22-2013, 07:00 AM	#4
PanelDeland I am a Referee of life. Join Date: Jun 2000 Location: Greensboro N.C. Posts: 13,993	Re: Rear 4" drop, did you c-notch? pics please I didn't notch.I do need to do the shock relo I think.It seems like a speed bump occassionally bumps th bumpstops.I think shock relo will stop that but I may need to trim the BS a bit.It's not bad,just enough to tell. Sorry I don't have a pic on this puter. __________________ The 47-present Chevrolet and GMC Truck Message Board Network,it's owners,moderators,members,and associates of any type should not be held responsible for my opinion. You can't fix stupid,not even with duct tape. "My appearance is due to the fact that "GOD" does punish you for having too much fun!" Barrett-Jackson has perfected alchemy,they make rust into gold! "You can lead a horse to water but you can't saddle a duck" "Cleverly disguised as a 'Responsible Adult' "Sometimes your Knight in shining armor is just a retard in tinfoil"

04-22-2013, 07:33 AM	#5
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,862	Re: Rear 4" drop, did you c-notch? pics please You can go as much as 6" w/o a notch. At 6" you are close and have to be careful not to hit bump[ stops. I know of a truck with 7" drop/no notch and that is leaf sprung. __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~

03-12-2017, 09:08 AM	#7
GR8-68 Senior Member Join Date: Jun 2009 Location: Belews Creek , NC Posts: 4,220	Re: Rear 4" drop, did you c-notch? pics please I have a 2" block and a 4" spring and no c-notch, although I haven't drove mine yet I do not forsee any issues with it. I do plan to go to a 5" spring to get my wheel tucked a little more though and think I will still be fine __________________ Larry It is easily overlooked that what is now called vintage was once brand new. "Project 68" paypal.me/ldgrant

04-22-2013, 09:32 AM	#8
Mickm69 Registered User Join Date: Apr 2012 Location: Calhoun, La. Posts: 21	Re: Rear 4" drop, did you c-notch? pics please I just installed ECE 4-in. dropped springs in the rear of my '69 and have no need to notch. I did need to reposition the shocks though. Cheers! Mickm

04-22-2013, 11:56 AM	#9
big_al_71 Registered User Join Date: Jun 2008 Location: South Florida Posts: 11,375	Re: Rear 4" drop, did you c-notch? pics please No notch required for 4 inches, not even for a six inch.. Here is a pict from when my truck had a 4/6 drop kit from Early classics and it may have bottomed out once in three years. If you are going to carry substantial weight then maybe if not you will be fine. Attached Images __________________ Get your facts first, and then you can distort them as much as you please!!!!!. Sylvester's build thread >>>http://67-72chevytrucks.com/vboard/s...ht=big+rebuild

04-24-2013, 09:44 AM	#10
Sid138 Registered User Join Date: Mar 2012 Location: Valdese, NC Posts: 90	Re: Rear 4" drop, did you c-notch? pics please Ok, thanks. I called a few places including Classic Parts last week just to find the best deal on spindles for the front and coils for the rear. I was asking about drop kits and pricing everything I would need, and a sales rep said that a c-notch was "required" to drop 4" or more. I'm not sure that I've ever heard of anyone c notching unless they're really slamming their truck, so this sort of caught me off guard. And then I received a Brother's catalog the next day and they also recommend notching for 4" or more for their kits. I already have a 1" block kit in the rear, so I'm thinking about just adding 3" coils out back, along with shock relocating brackets and adjustable track bar, of course and 2.5" spindles in front. Just wanted to double check with you guys first to be sure. The fact is, I refuse to cut open the stereo area in my dash for a CD unit, so I'm going with the "factory" looking stereo with a USB port to operate my MP3 player, so I'm dang sure not gonna cut up my freakin' frame, ya know? But anyway, Thanks again, Sid __________________ 1972 C/10 short step, 327/TH350, Blue Print H8002k Aluminum heads, 268 Lunati Voodoo cam, Lunati lifters, valve springs, roller rockers and Summit Racing dbl roller timing chain, Holley 670 Street Avenger dual line carb, Edelbrock RPM Air Gap intake, Summit ceramic coated long tube headers, Flowmasters, 3:73 gear, 15x10 Wheel Vintique Rallys w/ 295/50 front and rear, 2/4 drop, Custom Sound Head unit, Alpine amp, Fosgate Punch P3, Kenwood 6x9 in the doors, Grant GT w/tilt, B&M MegaShifter...etc

04-24-2013, 11:15 AM	#11
original-71 ///Relaxed Atmosphere Join Date: May 2010 Location: Houston,Tx Posts: 1,266	Re: Rear 4" drop, did you c-notch? pics please they say that cause they want to sell you the c-notch kit. you dont need to c-notch i have 6 inch coils and a 1/2 inch block in the rear NO c-notch and NO problems. id rather take the advise from the board members than the advise of a sales person Attached Images __________________ 71-Cheyenne Super (E.C.E Static Drop 4.5/7". Intro Rally's 20X8.5 5" B.S 255/35/20 (F) 20X10 5.25 B.S 275/35/20 (R) 87-Silverado Static Drop 5/7" Raceline Explosion 5 22X8.5 (F) 22X10 (R) hector _________________________________ 1971 Chevrolet Cheyenne Super 1987 Chevrolet Silverado 2006 Ford Mustang GT 2012 Toyota 4-Runner 2014 Dodge Ram 1500 Sport Crew Cab

04-24-2013, 11:19 AM	#12
original-71 ///Relaxed Atmosphere Join Date: May 2010 Location: Houston,Tx Posts: 1,266	Re: Rear 4" drop, did you c-notch? pics please unless you plan to put some serious weight i wouldnt worry about it or plan to go lower in the future then i would c-notch. __________________ 71-Cheyenne Super (E.C.E Static Drop 4.5/7". Intro Rally's 20X8.5 5" B.S 255/35/20 (F) 20X10 5.25 B.S 275/35/20 (R) 87-Silverado Static Drop 5/7" Raceline Explosion 5 22X8.5 (F) 22X10 (R) hector _________________________________ 1971 Chevrolet Cheyenne Super 1987 Chevrolet Silverado 2006 Ford Mustang GT 2012 Toyota 4-Runner 2014 Dodge Ram 1500 Sport Crew Cab

04-24-2013, 03:31 PM	#13
CC69Rat Registered User Join Date: Jan 2011 Location: Chattanooga TN Posts: 6,208	Re: Rear 4" drop, did you c-notch? pics please ^^ Sweet stepper ! __________________ Chad 1967 C10 SWB - Project Savannah - 6.0/4L80 Currently underway 1968 C10 SWB - TOTY 2018, 50th Anniversary Tribute Project * Sold * Pride and Joy 1986 Silverado Short Fleet - Scarlet Sold 1985 Silverado Short Fleet Sold 2022 Jeep Gladiator Mojave 2001 Jeep Cherokee XJ 4x4 - Lifted, Built 1992 Jeep Cherokee XJ 4x4 - Lifted 2013 Honda Accord EX-L v6 Coupe 6spd (wife's ride)

04-26-2013, 08:37 AM	#14
One Big Rush Registered User Join Date: Apr 2013 Location: Fredericktown, OH Posts: 24	Re: Rear 4" drop, did you c-notch? pics please For those of you who have 4" coils and wanted more drop, how did you go about it? I have a 4" coil in the rear, but the truck needs another 1.5" or so to really make me happy. Are you just using lowering blocks, or did you also add the modified trac bar, shocks, and shock relocating kit? Thanks

04-26-2013, 09:56 AM	#15
CC69Rat Registered User Join Date: Jan 2011 Location: Chattanooga TN Posts: 6,208	Re: Rear 4" drop, did you c-notch? pics please Yes, at 5.5" rear you'd need to think about shock relocation and an adjustable track bar. Pinion angle becomes an issue if you're particular about it but some people are fine without adjusting it. __________________ Chad 1967 C10 SWB - Project Savannah - 6.0/4L80 Currently underway 1968 C10 SWB - TOTY 2018, 50th Anniversary Tribute Project * Sold * Pride and Joy 1986 Silverado Short Fleet - Scarlet Sold 1985 Silverado Short Fleet Sold 2022 Jeep Gladiator Mojave 2001 Jeep Cherokee XJ 4x4 - Lifted, Built 1992 Jeep Cherokee XJ 4x4 - Lifted 2013 Honda Accord EX-L v6 Coupe 6spd (wife's ride)

04-27-2013, 01:59 PM	#16
westbrookw LET'S GO...MOUNTAINEERS Join Date: Oct 2007 Location: Williamstown, WV Posts: 339	Re: Rear 4" drop, did you c-notch? pics please ^^he is absolutely right about pinion angle. I relocated the shocks, put on an adjustable traction bar, and had to shorten the drive shaft. And thanks sid138. This thing is about 12 years of changing my mind. Posted via Mobile Device __________________ 72 SWB/Step



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04-28-2013, 12:15 AM	#20
bugmasta Registered User Join Date: Aug 2009 Location: North Bend, WA Posts: 272	Re: Rear 4" drop, did you c-notch? pics please Here is mine with a 4/6 ECE drop kit. No notch needed Posted via Mobile Device __________________ 68 c20 build: http://67-72chevytrucks.com/vboard/s...d.php?t=358130 Club longbed ...cause girls like'em long!!!!!

04-28-2013, 04:25 AM	#21
skorpioskorpio Registered User Join Date: Nov 2010 Location: Los Angeles, CA Posts: 1,018	Re: Rear 4" drop, did you c-notch? pics please I always hate these numerical drop threads, it all really depends what you start out as. My Jimmy is getting a mild 12" drop and won't be even close to laying frame... but then again you can practically sit under it now .

04-28-2013, 09:41 AM	#23
BigDaddyV Registered User Join Date: Mar 2013 Location: Grand Island, Ne. Posts: 1,110	Re: Rear 4" drop, did you c-notch? pics please 4/6 drop here also no notch. But it will be diggin pavement soon enough, so I'm adding a deep notch __________________ *J. Vess, 6'6", Gearhead, Welder, Fabricator, Nutcase* 1955 Chevy Stepside "Dudley" My daily http://www.67-72chevytrucks.com/vboa...d.php?t=760288 1972 Chevy C10, Project "Chevro~Layed out" Nether Storm Build Thread http://67-72chevytrucks.com/vboard/s...23#post6007523 Last edited by BigDaddyV; 04-28-2013 at 09:48 AM. Reason: added a pic

04-28-2013, 03:46 PM	#24
fastnotch89 Registered User Join Date: Apr 2013 Location: Clover,SC Posts: 142	Re: Rear 4" drop, did you c-notch? pics please Do anyone have pictures of the 4/6 drop with a 1.5 lowering blocks?

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