Crossmember Question?????? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**Tim Christian** · 07-01-2002, 09:15 PM

Would your crossmember stay in the same place if you pulled out a 350 turbo and installed a 400 turbo?

**Tim Christian** · 07-01-2002, 10:19 PM

ttt

Longhorn Man · 07-01-2002, 10:30 PM

No, it would need to slide back about 6 inches...maybe four.

**Tim Christian** · 07-01-2002, 11:07 PM

Hey longhornmail, that is what I had figured but I have a 1969 GMC Custom with no motor or trans but it came out factory V-8, automatic. I was looking at my 67-69 GMC Master Parts Manual and it shows the only automatic was a 400 turbo that was offered in 69 if this is true than the crossmember will be in the right location does anyone know for sure if the 400 turbo was the only one offered?

da-burb · 07-01-2002, 11:22 PM

Not 4 sure, but I was thinking 67-68 you could get the powerglide or the th400 for automatics. I know I have parted 69's with th350's that should have been originals. Not much experience with 67-68's.

Tim, something I have noticed which might be worth while. So far all of my th400 cross members have had 2 flat metal loops on either side of where the tranny mount is. I think they have something to do with the emergency cable routing. I don't remember seeing anything like them on th350 cross members. That might help you ID what you have.

**Tim Christian** · 07-01-2002, 11:43 PM

Hey da-burb Yes you are right on the power glides but the Parts manual does list it and the 400 but no 350 I will check for the metal loops in the morning. Thanks

Longhorn Man · 07-01-2002, 11:53 PM

I can not remember if 69 was the first year, or if it was 70.

da-burb · 07-02-2002, 12:09 AM

Not that they are the all knowing answer to your question, but Advanced Adapters say the th350 is a 69 to 81 transmission on this web site link.

http://www.advanceadapters.com/acrobat/gtrans.pdf

Nice info on a lot of the trannies there.

07-01-2002, 09:15 PM	#1
Tim Christian Senior Member Join Date: Dec 1999 Location: TN/VA Posts: 6,388	Crossmember Question?????? Would your crossmember stay in the same place if you pulled out a 350 turbo and installed a 400 turbo?

07-01-2002, 11:22 PM	#5
da-burb "Ochre Ogre" Join Date: Apr 2000 Location: Springfield, MN Posts: 3,558	Not 4 sure, but I was thinking 67-68 you could get the powerglide or the th400 for automatics. I know I have parted 69's with th350's that should have been originals. Not much experience with 67-68's. Tim, something I have noticed which might be worth while. So far all of my th400 cross members have had 2 flat metal loops on either side of where the tranny mount is. I think they have something to do with the emergency cable routing. I don't remember seeing anything like them on th350 cross members. That might help you ID what you have. __________________ Bowtie Truck Stop Inc. Mid-West GM Truck Restoration Parts Supplier Your Key Parts, Auto Metal Direct, Dynacorn, and Goodmark dealer. like us @ www.facebook.com/BowtieTruckStop 1971 C-10 Suburban (Ochre) 1971 K-10 Suburban (Ochre) 1972 C-10 Suburban (Ochre) 1972 K-20 Suburban (Yellow- that just aint right!) Springfield, Minnesota 56087 Last edited by da-burb; 07-01-2002 at 11:26 PM.

07-02-2002, 12:09 AM	#8
da-burb "Ochre Ogre" Join Date: Apr 2000 Location: Springfield, MN Posts: 3,558	Not that they are the all knowing answer to your question, but Advanced Adapters say the th350 is a 69 to 81 transmission on this web site link. http://www.advanceadapters.com/acrobat/gtrans.pdf Nice info on a lot of the trannies there. __________________ Bowtie Truck Stop Inc. Mid-West GM Truck Restoration Parts Supplier Your Key Parts, Auto Metal Direct, Dynacorn, and Goodmark dealer. like us @ www.facebook.com/BowtieTruckStop 1971 C-10 Suburban (Ochre) 1971 K-10 Suburban (Ochre) 1972 C-10 Suburban (Ochre) 1972 K-20 Suburban (Yellow- that just aint right!) Springfield, Minnesota 56087

07-01-2002, 10:19 PM	#2
Tim Christian Senior Member Join Date: Dec 1999 Location: TN/VA Posts: 6,388	ttt

07-01-2002, 10:30 PM	#3
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	No, it would need to slide back about 6 inches...maybe four.

07-01-2002, 11:07 PM	#4
Tim Christian Senior Member Join Date: Dec 1999 Location: TN/VA Posts: 6,388	Hey longhornmail, that is what I had figured but I have a 1969 GMC Custom with no motor or trans but it came out factory V-8, automatic. I was looking at my 67-69 GMC Master Parts Manual and it shows the only automatic was a 400 turbo that was offered in 69 if this is true than the crossmember will be in the right location does anyone know for sure if the 400 turbo was the only one offered?

07-01-2002, 11:43 PM	#6
Tim Christian Senior Member Join Date: Dec 1999 Location: TN/VA Posts: 6,388	Hey da-burb Yes you are right on the power glides but the Parts manual does list it and the 400 but no 350 I will check for the metal loops in the morning. Thanks

07-01-2002, 11:53 PM	#7
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	I can not remember if 69 was the first year, or if it was 70.



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