Lowering a C20?? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

squeekyM · 11-25-2005, 05:41 PM

Hi Everyone,

Hope we all had a great thanksgiving. I was reading through a post and 71dragtruck and ratrod67 (spl?) both had posted pics of their long bed trucks. Needless to say, they both are solid looking trucks.

I have a 72 C20, and would like to achive this look, but am concerned with what it would take to drop a truck with 8 lug hubs and 3/4ton suspension. Anyone have any methods on how I could achive a 4/6 drop on a rear leaf 3/4ton setup? Thanks for all the info, take care.

- Jerry

DTerry · 11-25-2005, 08:00 PM

Welcome to the board. I too have a C-20 but mine is a 1970.
As lowering goes I lowered my c-20, I used 3in drop Spindels from GMC Pauls, Item number 1181582. They are for a 73-87 truck but they will fit if you change upper ball joints (maybe lowers) and outer tie rod ends. I replaced all ball joints and tie rods while I was at it. You also might have to do something with the steering stop because the spindels have a longer stop then the 67-72s have. I also plan on cutting one coil out for a 5in drop in the front.
For the back I used a flip kit. I bought perches from a local speed shop. I also c-notched it and boxed in the frame around the area.
I dont have any good pictures yet but Ill post some tomarrow.

chevy_fatman · 11-25-2005, 08:53 PM

I take it you haven't seen this baby yet...........

before pics....

And some after.....

I have followed the progress on this truck over the time and is a ver nice truck!!

squeekyM · 11-26-2005, 12:46 AM

Hi,

Thanks for the replies. The GMC looks sweet. So it sounds like spindles and a flip kit for the rear is the way to go. Any ideas on what would need to be done to switch to a 5 or 6 lug pattern. Thanks again for the help, looks good.

- Jerry

**special-K** · 11-26-2005, 09:17 AM

So you have leaf rear,right?Cuz coils are the same to drop as 1/2t in rear.You need to decide if you want it to be a half or three quarter ton,first.If you don`t want the better brakes and wheel bearings of a 3/4t,then go out and buy a dropped spindle/disc brake conversion kit for pre-71s and change to a 12-bolt rear.There are lots of custom 8-lug wheels.So,I`d suggest staying with what you`ve got and just do a low 3/4t.More trick,IMHO.

crazy longhorn · 11-26-2005, 03:47 PM

IMO, its cheaper to swap 1/2 ton pcs under,especially on the wheel selection, & the front suspension. here is the route I went.... http://community.webshots.com/user/hotrodhorn

L

jostrans68 · 11-26-2005, 04:17 PM

look up member name cobalt he has been doing this also

WB72 · 11-28-2005, 03:48 PM

I converted my C-20 to a half ton front and rear, then used lowering parts for a C-10 and 73 and newer front end parts. It was pretty cheap actually.

11-25-2005, 05:41 PM	#1
squeekyM Registered User Join Date: Jun 2005 Location: California Posts: 51	Lowering a C20?? Hi Everyone, Hope we all had a great thanksgiving. I was reading through a post and 71dragtruck and ratrod67 (spl?) both had posted pics of their long bed trucks. Needless to say, they both are solid looking trucks. I have a 72 C20, and would like to achive this look, but am concerned with what it would take to drop a truck with 8 lug hubs and 3/4ton suspension. Anyone have any methods on how I could achive a 4/6 drop on a rear leaf 3/4ton setup? Thanks for all the info, take care. - Jerry

11-25-2005, 08:00 PM	#2
DTerry '70 GMC C-25 LWB Join Date: Oct 2004 Location: Binghamton, N.Y. Posts: 273	Re: Lowering a C20?? Welcome to the board. I too have a C-20 but mine is a 1970. As lowering goes I lowered my c-20, I used 3in drop Spindels from GMC Pauls, Item number 1181582. They are for a 73-87 truck but they will fit if you change upper ball joints (maybe lowers) and outer tie rod ends. I replaced all ball joints and tie rods while I was at it. You also might have to do something with the steering stop because the spindels have a longer stop then the 67-72s have. I also plan on cutting one coil out for a 5in drop in the front. For the back I used a flip kit. I bought perches from a local speed shop. I also c-notched it and boxed in the frame around the area. I dont have any good pictures yet but Ill post some tomarrow. __________________ 1970 GMC C-25 LWB (middle of frame up) 5-7 drop with 3in drop spindles, flip kit with blocks and still keeping the 3/4 ton. Shaved drip rails and marker lights, rear roll pan, cowl induction hood. 1987 Camaro z28 350, vortec 305 heads. 10:1 comp, t5 trans. Street terrrorizer. 1988 Monte Carlo (Super Stock ashpalt race car) My Truck

11-25-2005, 08:53 PM	#3
chevy_fatman Where's my beer? Join Date: Aug 2002 Location: I live in the state of denial.... Posts: 5,621	Re: Lowering a C20?? I take it you haven't seen this baby yet........... before pics.... And some after..... I have followed the progress on this truck over the time and is a ver nice truck!! __________________ Paul How do you make the invisible, visible?.........You take it away.

11-26-2005, 12:46 AM	#4
squeekyM Registered User Join Date: Jun 2005 Location: California Posts: 51	Re: Lowering a C20?? Hi, Thanks for the replies. The GMC looks sweet. So it sounds like spindles and a flip kit for the rear is the way to go. Any ideas on what would need to be done to switch to a 5 or 6 lug pattern. Thanks again for the help, looks good. - Jerry

11-26-2005, 09:17 AM	#5
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,852	Re: Lowering a C20?? So you have leaf rear,right?Cuz coils are the same to drop as 1/2t in rear.You need to decide if you want it to be a half or three quarter ton,first.If you don`t want the better brakes and wheel bearings of a 3/4t,then go out and buy a dropped spindle/disc brake conversion kit for pre-71s and change to a 12-bolt rear.There are lots of custom 8-lug wheels.So,I`d suggest staying with what you`ve got and just do a low 3/4t.More trick,IMHO. __________________ "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 ~

11-26-2005, 03:47 PM	#6
crazy longhorn Fabricate till you "puke" Join Date: Jun 2002 Location: Ill Posts: 9,402	Re: Lowering a C20?? IMO, its cheaper to swap 1/2 ton pcs under,especially on the wheel selection, & the front suspension. here is the route I went.... http://community.webshots.com/user/hotrodhorn L __________________ 69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears....

11-26-2005, 04:17 PM	#7
jostrans68 Jostrans68 Join Date: Mar 2001 Location: Bloomington indiana Posts: 1,182	Re: Lowering a C20?? look up member name cobalt he has been doing this also __________________ [CGTW Member former 67-72 now with a 96 silverado

11-28-2005, 03:48 PM	#8
WB72 Before and After Join Date: Feb 2000 Location: Leduc, Alberta CANADA Posts: 632	Re: Lowering a C20?? I converted my C-20 to a half ton front and rear, then used lowering parts for a C-10 and 73 and newer front end parts. It was pretty cheap actually. __________________ Not Grandpa's C-20 anymore... 383 Stroker 425HP, 485Ft/Lbs Lowered 3.5" Front / 5" Rear 66,000 miles. Alberta, CANADA



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