Is a C-Notch necessary? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

OldSkool71 · 07-07-2003, 03:53 AM

Im think of doing a 4/6 drop on my 71 C10 Fleetside SWB. Is a C-notch necessary or recommended? I don't want to have any problems just have a nice ride. Also need suggestions on rim/tire sizes 15-16-17? Probably 15's TT2's my wife will kill me if I try to go any bigger than that.

Joe67 · 07-07-2003, 08:35 AM

With a 6" rear drop your axle will hit without a c-notch

454ss_2 · 07-07-2003, 09:01 AM

Yes you need one, or you will have a bent frame and broken back...from the axle hitting the frame on every bump.

OldSkool71 · 07-07-2003, 01:13 PM

thanks maybe I don't have to go that low. Im looking at this as an example..?

454ss_2 · 07-07-2003, 05:51 PM

Quote:

Originally posted by OldSkool71
thanks maybe I don't have to go that low. Im looking at this as an example..?

That truck and drop looks real sweet

OldSkool71 · 07-07-2003, 05:54 PM

that's a 4.5 front and 6.5 rear without a notch? I was told from high authority that a c-notch is not necessary? What do you think?

*RandysGal* · 07-08-2003, 01:19 PM

I wouldn't be woried about tire size tickin off the wife. I would however be worried about explaining how you bent the frame without a "C" notch with that much of a drop. And I would imagine the ride would be everything but nice

Dandeluxe · 07-08-2003, 03:52 PM

Does anybody have a pic. of a c- notch i need to see how this is done and is it really necessary?

OldSkool71 · 07-08-2003, 04:12 PM

Here is a link to a pic. Im still having trouble trying to get some pics to uplaod because of size. Still working on it.

http://www.classicperform.com/6372CNK.html

Slammed '87 · 07-08-2003, 08:39 PM

This is my old c-notch on my '87. I dunno how different the frame's are between the year's but you get the idea. I also don't know for sure the clearance on your ride, but i know on '73 to '87's you don't have to have a c-notch with 6" drop. As long as you remove the oem bumpstop, and add a new shorter bumpstop, you will not have any problem's. Mind you on huge bump's you may bottom out, but for city/hiway use you shouldn't have a problem. BUT, seeing that c-notch's are really cheap and easy to install, i would go for it. Then at least it's done right!

**1971Stepside** · 07-10-2003, 04:06 PM

I have the Early Classic Enterprise 4/6 drop on mine and I spoke with them on two different occasions about needing a c-notch. Both times they told me no way do you need a c-notch with the 4/6 drop. I didn't put one in and I think I will have to hit a very big bump or hole to get the axle to hit the rubbers.

OldSkool71 · 07-10-2003, 04:50 PM

1971Stepside, that is what I was told as well. Did you remove the bump stops or trim them? How does it ride? Now that im looking at my truck a little closer im wondering if im gonna have problems with my headers? Damn!

old gearhead · 07-19-2003, 03:22 AM

I have run a 4/6" drop for a lot of years with no problems and no c-notch. I also run really stiff shocks and drive cautiously.(not because of the drop, but because its my baby. LOL) I was concerned with frame strength, and I try never to do anything I can't undo later. Good luck, J

Hotrod70C10 · 07-21-2003, 10:16 AM

Nice thread guys, I'll keep this in mind if I decide to go with a 5 or 6 drop instead of the 4 i have now.

Coursey · 09-16-2014, 01:41 PM

Quote:

Originally Posted by OldSkool71

1971Stepside, that is what I was told as well. Did you remove the bump stops or trim them? How does it ride? Now that im looking at my truck a little closer im wondering if im gonna have problems with my headers? Damn!

Which route did you decide to go and how does it ride?

07-07-2003, 03:53 AM	#1
OldSkool71 C/10 CLUB MEMBER Join Date: Jul 2003 Location: Lakewood, CA Posts: 993	Is a C-Notch necessary? Im think of doing a 4/6 drop on my 71 C10 Fleetside SWB. Is a C-notch necessary or recommended? I don't want to have any problems just have a nice ride. Also need suggestions on rim/tire sizes 15-16-17? Probably 15's TT2's my wife will kill me if I try to go any bigger than that.

07-07-2003, 08:35 AM	#2
Joe67 67 is sold Join Date: Apr 2001 Location: Troy, Michigan Posts: 6,733	With a 6" rear drop your axle will hit without a c-notch __________________ Joe - Formerly 67c10step ------------------------------- 1967 Chevy Stepside - ECE 4/6, fuelcell, 5lug - SOLD gr8lakes - My ebay auctions Click here to order forum apparel :: Click here to become a subscribing member

07-07-2003, 09:01 AM	#3
454ss_2 Registered User Join Date: Oct 2002 Location: Staten Island, NY Posts: 389	Yes you need one, or you will have a bent frame and broken back...from the axle hitting the frame on every bump. __________________ 90 454ss 92 454ss 00 Silverado 08 Avalanche LTZ

07-07-2003, 01:13 PM	#4
OldSkool71 C/10 CLUB MEMBER Join Date: Jul 2003 Location: Lakewood, CA Posts: 993	thanks maybe I don't have to go that low. Im looking at this as an example..? Attached Images

07-07-2003, 05:54 PM	#6
OldSkool71 C/10 CLUB MEMBER Join Date: Jul 2003 Location: Lakewood, CA Posts: 993	that's a 4.5 front and 6.5 rear without a notch? I was told from high authority that a c-notch is not necessary? What do you think? __________________ -Ron- Last edited by OldSkool71; 07-08-2003 at 04:28 AM.

07-08-2003, 01:19 PM	#7
RandysGal Account Suspended Join Date: Jan 2003 Location: Virginia Beach, Va Posts: 531	I wouldn't be woried about tire size tickin off the wife. I would however be worried about explaining how you bent the frame without a "C" notch with that much of a drop. And I would imagine the ride would be everything but nice

07-08-2003, 03:52 PM	#8
Dandeluxe Senior Member Join Date: Nov 2001 Location: st.louis mo. Posts: 717	c- notch ???? Does anybody have a pic. of a c- notch i need to see how this is done and is it really necessary? __________________ 1969 cst swb 350/400 th . DANNY C . ["]FRIENDS DONT LET FRIENDS DRIVE F@RD$!! 1969 cst swb corvette hugger orange with 400 hp sbc I started out with nothing and i held on to it

07-08-2003, 04:12 PM	#9
OldSkool71 C/10 CLUB MEMBER Join Date: Jul 2003 Location: Lakewood, CA Posts: 993	Here is a link to a pic. Im still having trouble trying to get some pics to uplaod because of size. Still working on it. http://www.classicperform.com/6372CNK.html

07-08-2003, 08:39 PM	#10
Slammed '87 Registered User Join Date: Feb 2003 Location: Calgary Canada Posts: 556	here's my old c-notch This is my old c-notch on my '87. I dunno how different the frame's are between the year's but you get the idea. I also don't know for sure the clearance on your ride, but i know on '73 to '87's you don't have to have a c-notch with 6" drop. As long as you remove the oem bumpstop, and add a new shorter bumpstop, you will not have any problem's. Mind you on huge bump's you may bottom out, but for city/hiway use you shouldn't have a problem. BUT, seeing that c-notch's are really cheap and easy to install, i would go for it. Then at least it's done right! Attached Images

07-10-2003, 04:06 PM	#11
1971Stepside Almost Satisfied Join Date: Mar 2002 Location: Springfield, MO Posts: 2,932	I have the Early Classic Enterprise 4/6 drop on mine and I spoke with them on two different occasions about needing a c-notch. Both times they told me no way do you need a c-notch with the 4/6 drop. I didn't put one in and I think I will have to hit a very big bump or hole to get the axle to hit the rubbers. __________________ 1971 C10 Stepside. LSx 6.0 with BTR Stage IV, Speed Engineering Headers, 4L80e transmission w/3200 Circle-D Stall. 3.73. Posi. Purchased this truck when I was 17. I started the rebuild (or take apart) in 1993. I have drug it around all over the country in pieces. Finally back on the road in 2021. "I can't complain, but sometimes I still do. Life's been good to me so far."

07-10-2003, 04:50 PM	#12
OldSkool71 C/10 CLUB MEMBER Join Date: Jul 2003 Location: Lakewood, CA Posts: 993	1971Stepside, that is what I was told as well. Did you remove the bump stops or trim them? How does it ride? Now that im looking at my truck a little closer im wondering if im gonna have problems with my headers? Damn! __________________ -Ron-

07-19-2003, 03:22 AM	#13
old gearhead Registered User Join Date: Sep 2002 Location: Guthrie, OK Posts: 21	I have run a 4/6" drop for a lot of years with no problems and no c-notch. I also run really stiff shocks and drive cautiously.(not because of the drop, but because its my baby. LOL) I was concerned with frame strength, and I try never to do anything I can't undo later. Good luck, J

07-21-2003, 10:16 AM	#14
Hotrod70C10 Low & Slow Join Date: Dec 2002 Location: Oklahoma Posts: 1,047	Nice thread guys, I'll keep this in mind if I decide to go with a 5 or 6 drop instead of the 4 i have now. __________________ 70' C-10 LWB Fleetside 4.5/6 drop

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