Transmission crossmember change to auto. - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Mark B · 09-24-2012, 12:18 PM

Can a crossmember salvaged from an automatic transmission truck be bolted into my truck without removing the cab? (I am changing my truck from a three speed to TH350).

thanks
Mark

airdale94 · 09-24-2012, 07:15 PM

If it's a three speed (tail shaft mount) Saginaw I believe they are the same.

71tahoe · 09-24-2012, 08:37 PM

I'll say yes. I think the upper bolts have to go in from bottom unless they are real short but it will go with the cab on.

CSGAS · 09-25-2012, 03:06 AM

The tricky answer is yes.

You can bolt in the crossmember to hold an automatic up by the tailshaft, without pulling the cab off.

However (and here's the trick) removing the crossmember that holds the bellhousing for the 3-speed (which gets in the way of installing the automatic) will be difficult without removing the cab, unless you have an air chisel for the rivets. Getting at the top ones with a drill would involve going at them at an angle, and I shudder to think about doing them with a hand chisel and hammer.

09-24-2012, 12:18 PM	#1
Mark B Registered User Join Date: Oct 2005 Location: Ontario, Canada Posts: 145	Transmission crossmember change to auto. Can a crossmember salvaged from an automatic transmission truck be bolted into my truck without removing the cab? (I am changing my truck from a three speed to TH350). thanks Mark

09-24-2012, 07:15 PM	#2
airdale94 Registered User Join Date: Jan 2007 Location: Topeka,KS Posts: 778	Re: Transmission crossmember change to auto. If it's a three speed (tail shaft mount) Saginaw I believe they are the same. __________________ 68' C20. 283CI w/55CC 305HO heads, NP435 Close Ratio, Corp. 14 bolt FF 3.21, 75' front end swap (everything but the X-member).

09-24-2012, 08:37 PM	#3
71tahoe Registered User Join Date: May 2006 Location: Jonesboro, AR Posts: 916	Re: Transmission crossmember change to auto. I'll say yes. I think the upper bolts have to go in from bottom unless they are real short but it will go with the cab on.

09-25-2012, 03:06 AM	#4
CSGAS optomistic ah-so Join Date: Mar 2009 Location: Charlotte, NC Posts: 544	Re: Transmission crossmember change to auto. The tricky answer is yes. You can bolt in the crossmember to hold an automatic up by the tailshaft, without pulling the cab off. However (and here's the trick) removing the crossmember that holds the bellhousing for the 3-speed (which gets in the way of installing the automatic) will be difficult without removing the cab, unless you have an air chisel for the rivets. Getting at the top ones with a drill would involve going at them at an angle, and I shudder to think about doing them with a hand chisel and hammer. __________________ Rubbing is Racin' Ribbing is Bench Racin' 1970 C-10 lwb Fleetside. Originally 350 2-bbl 3-on-the-tree, m/b, m/w, m/s no a/c. Currently running on a '76 Camaro 305.



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