3 speed transmission crossmember - The 1947 - Present Chevrolet & GMC Truck Message Board Network

ne72gmc · 12-26-2018, 07:57 PM

I'm getting ready to install my 3-speed tranny and realized I don't have the rear crossmember to support the back of the transmission.

So do I need a crossmember for the smaller transmission? I'm running a L6 250 with a 3-speed muncie on my 72 GMC.

**kwmech** · 12-26-2018, 08:01 PM

Quite a few of the 3 speeds didn't have a x-member, just had the 4 bolts holding the trans to the bell. The bell was the member

ne72gmc · 12-26-2018, 08:09 PM

Thanks! That goes with all my research and the only reference to a rear crossmember in the factory assembly manual is for the autos.

**LockDoc** · 12-26-2018, 08:53 PM

Quote:

Originally Posted by ne72gmc

Thanks! That goes with all my research and the only reference to a rear crossmember in the factory assembly manual is for the autos.

Yep, the bell housing cross member/mount is all you need. The trans hangs out in mid-air....

LockDoc

ne72gmc · 12-26-2018, 09:22 PM

Cool, thanks guys for keeping me strait.

dondb · 12-28-2018, 12:46 PM

Perfect timing on the question. I was under the truck yesterday....had no cross member. 69 C10 307 three on the tree. Was pretty odd to see the spot on the tranny were the crossmember would go but nothing there! I'm thinking how the hell could i have missed this owning the truck 4 months now.

12-26-2018, 07:57 PM	#1
ne72gmc Registered User Join Date: Jan 2018 Location: Omaha, NE Posts: 89	3 speed transmission crossmember I'm getting ready to install my 3-speed tranny and realized I don't have the rear crossmember to support the back of the transmission. So do I need a crossmember for the smaller transmission? I'm running a L6 250 with a 3-speed muncie on my 72 GMC. __________________ Bruce 70 Chevy C10 SWB Stepside

12-26-2018, 08:01 PM	#2
kwmech Senior Member Join Date: Mar 2003 Location: Colfax-California Posts: 8,649	Re: 3 speed transmission crossmember Quite a few of the 3 speeds didn't have a x-member, just had the 4 bolts holding the trans to the bell. The bell was the member

12-26-2018, 08:09 PM	#3
ne72gmc Registered User Join Date: Jan 2018 Location: Omaha, NE Posts: 89	Re: 3 speed transmission crossmember Thanks! That goes with all my research and the only reference to a rear crossmember in the factory assembly manual is for the autos. __________________ Bruce 70 Chevy C10 SWB Stepside

12-26-2018, 09:22 PM	#5
ne72gmc Registered User Join Date: Jan 2018 Location: Omaha, NE Posts: 89	Re: 3 speed transmission crossmember Cool, thanks guys for keeping me strait. __________________ Bruce 70 Chevy C10 SWB Stepside

12-28-2018, 12:46 PM	#6
dondb Registered User Join Date: Mar 2018 Location: nh Posts: 184	Re: 3 speed transmission crossmember Perfect timing on the question. I was under the truck yesterday....had no cross member. 69 C10 307 three on the tree. Was pretty odd to see the spot on the tranny were the crossmember would go but nothing there! I'm thinking how the hell could i have missed this owning the truck 4 months now. __________________ 1969 C-10 LWB SS 1969 Camaro Pro Tour 2002 Camaro SS LE Rag Top #937



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