I-6 vs. v-8 trans crossmember - The 1947 - Present Chevrolet & GMC Truck Message Board Network

lilred67 · 08-22-2007, 02:30 PM

for those of you who have changed over your 6 cly. trucks to v-8 and move the manual tranny crossmember foward for the v-8 to sit in the correct position.the question is did you reuse your crossmember or us a v-8 cross member from a donor truck. i moved mine last night and it was not as straight foward as i thought it would be(thought i was working on a ferd)

. the bolt holes wouldn't all line up and the corners of the crossmembers where hanging up on the inside on the frame. i had to completely remove the crossmember and do some engineering to make it all fit.i air chiseled the rivets out and bolted it back in with grade 8 hardware. what kind of problems did any of you have??

OlChev67 · 08-22-2007, 02:42 PM

I didnt do anything with my crossmember when I switched to v8. I just have the bellhousing crossmember. This is the only pic I found of it.

Oh you said the correct position. I am not sure about mine being in the correct position, but it works.

glock35ipsc · 08-22-2007, 03:46 PM

If you are reusing the I-6 engine stands, then it shouldn't have to be moved. If you switched to the V-8 stands, I would guess some people would just use an automatic crossmember, or an aftermarket crossmember since most all 3 and 4 speeds I've seen has the ability to be mounted from the rear, as is the trans in the pic above.

My truck was already swapped over to a V-8 when I bought it, using the original 3-speed manual trans in the original location, with the I-6 towers.

lilred67 · 08-22-2007, 10:28 PM

i wanted to move mine when i did the v-8 swap just to make it look factory.
yes glock35ipsc, i'm using v-8 stands and anything else i needed from a donor truck except crossmember and tranny.
the original x-member seemed to work fine after some adjustments,i thought it would slide foward and bolt in with no problems.

shifty · 08-23-2007, 04:32 PM

the L6 and V8 trucks had totally diff't tranny crossmembers. V8 is flat and wide, L6 is half-round and skinny. the V8 xmember sits back about a foot from where the L6 does.

2bits · 08-23-2007, 06:30 PM

I was wondering about that issue with manual crossmembers because it didn't look like it could move anywhere. Mine was riveted in too, the PO just cut out the crossmember with a torch when he put in an automatic.

That sounds like a real headache, but might be easier now that you know the V-8 member is a different part. Good luck!

shifty · 08-23-2007, 10:41 PM

you can also grind out the old crossmember. that's what i did.

08-22-2007, 02:30 PM	#1
lilred67 Senior Member Join Date: Mar 2005 Location: weatherford,texas Posts: 1,003	I-6 vs. v-8 trans crossmember for those of you who have changed over your 6 cly. trucks to v-8 and move the manual tranny crossmember foward for the v-8 to sit in the correct position.the question is did you reuse your crossmember or us a v-8 cross member from a donor truck. i moved mine last night and it was not as straight foward as i thought it would be(thought i was working on a ferd) . the bolt holes wouldn't all line up and the corners of the crossmembers where hanging up on the inside on the frame. i had to completely remove the crossmember and do some engineering to make it all fit.i air chiseled the rivets out and bolted it back in with grade 8 hardware. what kind of problems did any of you have??

08-22-2007, 02:42 PM	#2
OlChev67 Ever heard of Beech Island?? Join Date: Apr 2007 Location: Clemson, SC Posts: 327	Re: I-6 vs. v-8 trans crossmember I didnt do anything with my crossmember when I switched to v8. I just have the bellhousing crossmember. This is the only pic I found of it. Oh you said the correct position. I am not sure about mine being in the correct position, but it works. Attached Images Last edited by OlChev67; 08-22-2007 at 02:44 PM. Reason: forgot something

08-22-2007, 03:46 PM	#3
glock35ipsc Next project: 1970 K10 Join Date: Feb 2004 Location: Fort Collins, Colo 80524 Posts: 6,685	Re: I-6 vs. v-8 trans crossmember If you are reusing the I-6 engine stands, then it shouldn't have to be moved. If you switched to the V-8 stands, I would guess some people would just use an automatic crossmember, or an aftermarket crossmember since most all 3 and 4 speeds I've seen has the ability to be mounted from the rear, as is the trans in the pic above. My truck was already swapped over to a V-8 when I bought it, using the original 3-speed manual trans in the original location, with the I-6 towers. __________________ *Bob* 1970 Chevy K10 LWB "Goldie" 350/TH350 *next project!!* 1981 Chevy C10 LWB 355/TH350 - My son's truck LS SWAP FORUM! Tons of LS swap info here! PLEASE CLICK HERE TO SUPPORT THE GREATEST BOARD ON THE NET! CLICK HERE FOR THE FAQ INDEX by KRUE

08-22-2007, 10:28 PM	#4
lilred67 Senior Member Join Date: Mar 2005 Location: weatherford,texas Posts: 1,003	Re: I-6 vs. v-8 trans crossmember i wanted to move mine when i did the v-8 swap just to make it look factory. yes glock35ipsc, i'm using v-8 stands and anything else i needed from a donor truck except crossmember and tranny. the original x-member seemed to work fine after some adjustments,i thought it would slide foward and bolt in with no problems.

08-23-2007, 04:32 PM	#5
shifty Questionable Join Date: Mar 2005 Location: Atlanta Posts: 13,376	Re: I-6 vs. v-8 trans crossmember the L6 and V8 trucks had totally diff't tranny crossmembers. V8 is flat and wide, L6 is half-round and skinny. the V8 xmember sits back about a foot from where the L6 does. __________________ If I've got anything up for grabs, it'll be here: 7-hole gauge cluster for a 67-72 p/u FREE (link) I can't check the forum daily. If I don't reply to you within 24 hours, drop me a PM! I'm (hopefully) still alive and will reply faster to a PM. Last edited by shifty; 08-23-2007 at 04:32 PM.

08-23-2007, 06:30 PM	#6
2bits Registered User Join Date: Jan 2006 Location: Dallas Posts: 504	Re: I-6 vs. v-8 trans crossmember I was wondering about that issue with manual crossmembers because it didn't look like it could move anywhere. Mine was riveted in too, the PO just cut out the crossmember with a torch when he put in an automatic. That sounds like a real headache, but might be easier now that you know the V-8 member is a different part. Good luck! __________________ _______________ Thomas '78 Silverado '74 Monte Carlo '47 Teardrop Trailer East Texas Classics Local Club

08-23-2007, 10:41 PM	#7
shifty Questionable Join Date: Mar 2005 Location: Atlanta Posts: 13,376	Re: I-6 vs. v-8 trans crossmember you can also grind out the old crossmember. that's what i did. __________________ If I've got anything up for grabs, it'll be here: 7-hole gauge cluster for a 67-72 p/u FREE (link) I can't check the forum daily. If I don't reply to you within 24 hours, drop me a PM! I'm (hopefully) still alive and will reply faster to a PM.



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