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Old 04-08-2021, 03:08 PM   #1
mrhurt73
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is this crossmember 6 cyl manual only?

I am in need of finding a transmission crossmember, but i see conflicting info on which ones i could replace it with.
the truck is a 1971 C-10 with straight 6 and 3 speed manual transmission

found a truck with V8 manual transmission and crossmember is in different holes

see the attached pictures i took for reference, any help will greatly be appreciated

and yes it broke the bellhousing, i think its only a 6 cyl bellhousing part also because of starter mounting in bellhousing
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Old 04-08-2021, 03:20 PM   #2
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Re: is this crossmember 6 cyl manual only?

Can't help with the crossmember but the starter was mounted to the bellhousing for manual transmission trucks regardless of engine up to 1973. So that bellhousing mounted starter is not just a six cylinder part.
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Old 04-08-2021, 03:22 PM   #3
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Re: is this crossmember 6 cyl manual only?

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Originally Posted by MJN View Post
Can't help with the crossmember but the starter was mounted to the bellhousing for manual transmission trucks regardless of engine up to 1973. So that bellhousing mounted starter is not just a six cylinder part.
well thats a start, thanks for the info.
hopefully someone knows about crossmember
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Old 04-08-2021, 05:01 PM   #4
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Re: is this crossmember 6 cyl manual only?

That bellhousing also has two different hole sizes one for sm420 sm465 has a larger hole

I can not say if crossmember differs
In c10 trucks they moved the v8 further ahead inches frame to a 6 cyl which was in in back set of engine mount holes
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Old 04-08-2021, 05:24 PM   #5
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Re: is this crossmember 6 cyl manual only?

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Originally Posted by gmc684x4 View Post
That bellhousing also has two different hole sizes one for sm420 sm465 has a larger hole

I can not say if crossmember differs
In c10 trucks they moved the v8 further ahead inches frame to a 6 cyl which was in in back set of engine mount holes
Left SM420 Right SM465

That crossmember looks like a 6cyl. I could be wrong. GrumpyOldMan would know
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Old 04-08-2021, 05:38 PM   #6
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Re: is this crossmember 6 cyl manual only?

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Originally Posted by Furno68C20 View Post
Left SM420 Right SM465

That crossmember looks like a 6cyl. I could be wrong. GrumpyOldMan would know
the one on the right looks like the one i got. this one is a 3 speed transmission i wonder if i found a SM465 bellhousing would it still work? the bolts should line it up as far a centerline. don't know, just thinking out loud
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Old 04-08-2021, 06:17 PM   #7
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Re: is this crossmember 6 cyl manual only?

Quote:
Originally Posted by mrhurt73 View Post
I am in need of finding a transmission crossmember, but i see conflicting info on which ones i could replace it with.
the truck is a 1971 C-10 with straight 6 and 3 speed manual transmission

found a truck with V8 manual transmission and crossmember is in different holes

see the attached pictures i took for reference, any help will greatly be appreciated

and yes it broke the bellhousing, i think its only a 6 cyl bellhousing part also because of starter mounting in bellhousing


Read through this thread.

http://www.67-72chevytrucks.com/vboa....php?p=8633251

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Old 04-08-2021, 07:50 PM   #8
'68OrangeSunshine
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Re: is this crossmember 6 cyl manual only?

Quote:
Originally Posted by mrhurt73 View Post
I am in need of finding a transmission
L6 -only diagonal crossmembercrossmember, but i see conflicting info on which ones i could replace it with.
the truck is a 1971 C-10 with straight 6 and 3 speed manual transmission

found a truck with V8 manual transmission and crossmember is in different holes

see the attached pictures i took for reference, any help will greatly be appreciated

and yes it broke the bellhousing, i think its only a 6 cyl bellhousing part also because of starter mounting in bellhousing
Could be a special L6 292-only crossmember. They were only used on 4x4 trucks with a 292. 250s could be mounted on a conventional crossmember. C/ model trucks didn't need a special crossmember for a 292.

See pix:
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Last edited by '68OrangeSunshine; 04-08-2021 at 08:21 PM.
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Old 04-08-2021, 10:04 PM   #9
Grumpy old man
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Re: is this crossmember 6 cyl manual only?

You have a 6 cylinder manual cross member , You can see in these pictures the V8 cross member mounts further forward in the frame . How did you bend it like that ? you may want to take some X measurements to check if the bent cross member tweaked the frame out of square ?
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Old 04-09-2021, 11:59 PM   #10
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Re: is this crossmember 6 cyl manual only?

That looks like the same crossmember that was in my 292 SM465. Mine was a but straighter though. It mounted in the holes directly in front of the front cab mount.
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Old 05-04-2021, 12:02 PM   #11
mrhurt73
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Re: is this crossmember 6 cyl manual only?

I found a crossmember and bellhousing while i was in pigeon forge for the spring rod run.
price was higher than it should have been, but its pigeon forge prices. and i was there and it was there. so now its sandblasted and painted, going in frame. and i did check frame, got lucky the old crossmember started to rip at the rivets instead of pulling frame.
thansk everyone for all the info
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Old 05-04-2021, 12:42 PM   #12
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Re: is this crossmember 6 cyl manual only?

Here are a couple more pictures of the V8 vs 6 trans cross members the V8 is on the left .


The bell housings are different by the size of the hole for the trans , the 67 bell housing is smaller .
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Old 05-05-2021, 02:06 PM   #13
'68OrangeSunshine
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Re: is this crossmember 6 cyl manual only?

Bellhousing for the MY '68-later SM 465 has casting numbers: [GM5] 3925505 = 5-1/8'' diameter.
SM420 bellhousing was [GM11] 3815891 = 4-9/16'' dia.
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