DIY4X crossmember fitment - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Turnip Truck · 02-05-2018, 01:16 PM

Alright, here's my dilemma. I'm in the parts gathering phase of converting my 1970 C30 to a K. I have a 1988 V30 donor truck that I'm going to use the axles, trans and transfer case out of. Anyway my question is about the DIY4X first gen cross member.. its height in particular.

My x member 'C' pieces are too tall to fit inside the frame 'C'. Not much, but enough to matter. maybe .125". Has anyone encountered this issue? I put a caliper on Kerts 'C' part and came up with 5.25" tall. Can I persuade one of you gents with a k10/20 frame to measure inside the channel at the x member area? I assume (famous last words) that the frame would have the same height dimensions from the cab forward regardless of 10/20/30 series.

Now this issue may be because I have a 1ton frame?? but I find it odd that my frame would be SHORTER than a 1/2 or 3/4 ton. I called DIY4X this morning but Kert was out with the flu. Any help would be appreciated.

Thanks,

**Jcfcamaro** · 02-05-2018, 01:35 PM

Are you talking about the motor cross member or the trans/transfer case cross member?

Turnip Truck · 02-05-2018, 01:37 PM

Engine cross member. Should have been more specific.

**Jcfcamaro** · 02-05-2018, 01:44 PM

I have a 72 K10 in the shop. I'll go measure it.

**Jcfcamaro** · 02-05-2018, 01:59 PM

On the front side of the cross member this is what I got. Drivers side is right at 5 in. Passenger side is at 5 1/8. My cross member is at the v-8 location so the measurements were taken between the v8 location and the 6 cylinder location.

B. W. · 02-05-2018, 02:05 PM

I think the C30 frame height from top to bottom may be greater than the 20. Ignore this, just re-read what you posted. Based on JC's measurements your x member is too tall for his frame also?

b454rat · 02-06-2018, 07:29 AM

Answered already but I did the 4wd swap thing to an 89 crew cab. I had access to a junkyard with 1/2, 3/4, and 1 ton 4wd trucks. The engine crossmember is the same
Between them. Maybe by 1/4”....

Turnip Truck · 02-06-2018, 12:08 PM

I just spoke with Kert @ DIY4X and let him know my issue. He measured some of his in stock parts and he says they are correct. The height is supposed to be just shy of 5.25"..

**Jcfcamaro** · 02-06-2018, 01:00 PM

What are you going to do?

**71blksuper4x4** · 02-06-2018, 02:30 PM

I think what is throwing things off is the thickness of the frame rails themselves. A c30 frame had thicker material for rails than a 1/2 or 3/4 ton. I might be just enough to cause issues. Trevor

Turnip Truck · 02-06-2018, 03:03 PM

Quote:

Originally Posted by 71blksuper4x4

I think what is throwing things off is the thickness of the frame rails themselves. A c30 frame had thicker material for rails than a 1/2 or 3/4 ton. I might be just enough to cause issues. Trevor

Hmmm.. That's a good point. I will pull a thickness measurement on my frame rail ASAP. The only thing that has me confused is JFCs measurements on this K10 frame (which is what the cross member is designed for and advertised to fit). His measurements are the same as mine on the C30.

02-05-2018, 01:16 PM	#1
Turnip Truck Registered User Join Date: Jan 2018 Location: Decatur Alabama Posts: 66	DIY4X crossmember fitment Alright, here's my dilemma. I'm in the parts gathering phase of converting my 1970 C30 to a K. I have a 1988 V30 donor truck that I'm going to use the axles, trans and transfer case out of. Anyway my question is about the DIY4X first gen cross member.. its height in particular. My x member 'C' pieces are too tall to fit inside the frame 'C'. Not much, but enough to matter. maybe .125". Has anyone encountered this issue? I put a caliper on Kerts 'C' part and came up with 5.25" tall. Can I persuade one of you gents with a k10/20 frame to measure inside the channel at the x member area? I assume (famous last words) that the frame would have the same height dimensions from the cab forward regardless of 10/20/30 series. Now this issue may be because I have a 1ton frame?? but I find it odd that my frame would be SHORTER than a 1/2 or 3/4 ton. I called DIY4X this morning but Kert was out with the flu. Any help would be appreciated. Thanks, __________________ Dan 1970 C30- 350/SM465 133" WB, Soon to be a K series 1970 C10- LWB 250/3OTT, (sold) 1966 IH Scout 800- 152/T-90/Dana 20/ D27s

02-05-2018, 01:35 PM	#2
Jcfcamaro Registered User Join Date: Jul 2015 Location: Fairfax, Missouri Posts: 1,054	Re: DIY4X crossmember fitment Are you talking about the motor cross member or the trans/transfer case cross member?

02-05-2018, 01:37 PM	#3
Turnip Truck Registered User Join Date: Jan 2018 Location: Decatur Alabama Posts: 66	Re: DIY4X crossmember fitment Engine cross member. Should have been more specific. __________________ Dan 1970 C30- 350/SM465 133" WB, Soon to be a K series 1970 C10- LWB 250/3OTT, (sold) 1966 IH Scout 800- 152/T-90/Dana 20/ D27s

02-05-2018, 01:44 PM	#4
Jcfcamaro Registered User Join Date: Jul 2015 Location: Fairfax, Missouri Posts: 1,054	Re: DIY4X crossmember fitment I have a 72 K10 in the shop. I'll go measure it.

02-05-2018, 01:59 PM	#5
Jcfcamaro Registered User Join Date: Jul 2015 Location: Fairfax, Missouri Posts: 1,054	Re: DIY4X crossmember fitment On the front side of the cross member this is what I got. Drivers side is right at 5 in. Passenger side is at 5 1/8. My cross member is at the v-8 location so the measurements were taken between the v8 location and the 6 cylinder location.

02-05-2018, 02:05 PM	#6
B. W. Registered User Join Date: Nov 2014 Location: Bigfork, Montana Posts: 1,137	Re: DIY4X crossmember fitment I think the C30 frame height from top to bottom may be greater than the 20. Ignore this, just re-read what you posted. Based on JC's measurements your x member is too tall for his frame also? Last edited by B. W.; 02-05-2018 at 02:11 PM.

02-06-2018, 07:29 AM	#7
b454rat Senior Member Join Date: May 2004 Location: Binghamton, NY Posts: 3,453	Re: DIY4X crossmember fitment Answered already but I did the 4wd swap thing to an 89 crew cab. I had access to a junkyard with 1/2, 3/4, and 1 ton 4wd trucks. The engine crossmember is the same Between them. Maybe by 1/4”.... __________________ 2000 GMC CCSB 454/4L80 6” lift SAS 1999 Chevy CCSB 454/NV4500 6” lift 1999 GMC Yukon 350/4L60 4" SAS

02-06-2018, 12:08 PM	#8
Turnip Truck Registered User Join Date: Jan 2018 Location: Decatur Alabama Posts: 66	Re: DIY4X crossmember fitment I just spoke with Kert @ DIY4X and let him know my issue. He measured some of his in stock parts and he says they are correct. The height is supposed to be just shy of 5.25".. __________________ Dan 1970 C30- 350/SM465 133" WB, Soon to be a K series 1970 C10- LWB 250/3OTT, (sold) 1966 IH Scout 800- 152/T-90/Dana 20/ D27s

02-06-2018, 01:00 PM	#9
Jcfcamaro Registered User Join Date: Jul 2015 Location: Fairfax, Missouri Posts: 1,054	Re: DIY4X crossmember fitment What are you going to do?

02-06-2018, 02:30 PM	#10
71blksuper4x4 SWB 4x4 Collector Join Date: Jun 2001 Location: Osage City, KS Posts: 5,148	Re: DIY4X crossmember fitment I think what is throwing things off is the thickness of the frame rails themselves. A c30 frame had thicker material for rails than a 1/2 or 3/4 ton. I might be just enough to cause issues. Trevor __________________ TREVOR 1970 CST swb 4x4 (speedwarning,cruise,tilt,tach,8track, original red shoulder belts,tow hooks) 1972 Jimmy (soon to be Hickey cloned) 1971 Cheyenne Super 4x4 swb (tilt,tach,buckets, original blue shoulder belts,am/fm,cruise,tow hooks, dealer 8 track) 1972 Cheyenne Super K20 4x4 Custom Camper (tilt, tach, am/fm, tow hooks, bed toolbox, aux gas tank 1972 Cheyenne Super Crew Cab K30 4x4 Duramax, Allison, np205, buckets, tow hooks (CURRENT PROJECT) http://67-72chevytrucks.com/vboard/s...d.php?t=624819 1989 V3500 Crew Cab (454tbi, NV4500, np205) 1970 Chevelle SS (LS5 454,th400,8track,buckets,tach) :2004 Jeep Wrangler Rubicon (daily driver) WTB: 1968-70 Cruise Control Lever



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