4x4 4spd to th350 crossmember help - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Jesse72 · 08-15-2005, 08:24 AM

I have a question some of you guys probially have an answer to. I had a 4spd and 205. I just bought a 350 and 203 set up when i bolt them in the holes dont line up for the adaptor or the transfer case do i have to get a new crossmember or can i drill mine for the new holes and mover the transfercase mount back? Are the cross memebers from 4spd to auto differend if so does anyone have one?
Thanks any info will help

**JIMs70GMC** · 08-15-2005, 08:38 AM

I think your going to have to wing it since the 350/203 combo was not offered in pre-73 vehicles. Do you have access to the cross member that was used with the 350/203 combo? Also, if memory serves me correct the 465/205 and 350/205 crossmembers available in pre-73 trucks are differnet also.

Jesse72 · 08-15-2005, 10:56 AM

Thanks, no i dont have access to the old crossmember. But the adaptor lines up to my cross memeber i will just have to drill it, and the transfer case mount looks like it can be moved and it will work fine and then i have to get the drive shafts modded.

gator2511 · 08-17-2005, 07:08 AM

Thats what I had to do when I went from a TH350 to a TH400.

08-15-2005, 08:24 AM	#1
Jesse72 Registered User Join Date: Jan 2005 Location: Ohio Posts: 171	4x4 4spd to th350 crossmember help I have a question some of you guys probially have an answer to. I had a 4spd and 205. I just bought a 350 and 203 set up when i bolt them in the holes dont line up for the adaptor or the transfer case do i have to get a new crossmember or can i drill mine for the new holes and mover the transfercase mount back? Are the cross memebers from 4spd to auto differend if so does anyone have one? Thanks any info will help __________________ Jesse 72 4x4 Sold 59 GMC air ride ls swap Last edited by Jesse72; 08-15-2005 at 08:24 AM.

08-15-2005, 08:38 AM	#2
JIMs70GMC user # 2756 Join Date: Jun 2001 Location: Chesapeake, Virginia Posts: 4,612	I think your going to have to wing it since the 350/203 combo was not offered in pre-73 vehicles. Do you have access to the cross member that was used with the 350/203 combo? Also, if memory serves me correct the 465/205 and 350/205 crossmembers available in pre-73 trucks are differnet also. __________________ 1970 K25, 8' stepside bed 350/465/205 44 up front, 60 in the rear 4.10s rolling on 33" Dunlop MTs 1986 K5, 350/465/208 Dana 60/14 bolt from a cucv 36" Super Swampers TSL/SX 1983 K20 w/ CUCV axles, 350/700R4/208 sitting on 37" Goodyears 1986 M1031 6.2 diesel, TH400/NP205 locker in the rear and a LS in the front, all stock for now..... 1986 K30, 350/400/205 dana 60 and 14 bolt. I kept the drivetrain. Body/bad and chassis are gone. 1981 K30, 350/465/205 dana 60 and dually 14 bolt. Has a G80, and a flat bed. Going to replace the flat bed. 1985 K20, 350/400/208 10 bolt and SF 14 bolt. I wonder where I can find some 1 tons. Hmmmmm

08-15-2005, 10:56 AM	#3
Jesse72 Registered User Join Date: Jan 2005 Location: Ohio Posts: 171	Thanks, no i dont have access to the old crossmember. But the adaptor lines up to my cross memeber i will just have to drill it, and the transfer case mount looks like it can be moved and it will work fine and then i have to get the drive shafts modded. __________________ Jesse 72 4x4 Sold 59 GMC air ride ls swap

08-17-2005, 07:08 AM	#4
gator2511 Registered User Join Date: Mar 2005 Location: tampa florida Posts: 776	Thats what I had to do when I went from a TH350 to a TH400.



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