64 C20 with 73-87 Front end Swap Question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

'64C20 · 01-02-2023, 04:57 PM

So I swapped a 73-87 C10 front end under my C20. I initially did this because I thought it would be cheaper than buying the 8-lug disc brake kit.

Anyways, now that everything is in, the trans mount for the SM420 bell housing is off by maybe an inch or so. I utilized the clamshells instead of the pedestals due to the fact that I want to swap a big block into it in the future.

Has anyone run into this? Idea was to use an adjustable trans mount and make a plate for the back of the trans.

scottofksu · 01-03-2023, 03:25 PM

I think most folks go to an adjustable transmission cross member similar to what is used in newer RWD vehicles (i.e., one that mounts to a bushing near the tail shaft of the transmission). I personally went this route, not because I swapped front ends, but because I couldn't find a bell housing for the T56 I purchased for my truck that would utilize the factory transmission mounts. The one problem you may run into is that using such a cross member for the transmission usually requires you to reconfigure your parking brake setup since they both go in the same area. I have seen a posting in the FAQ about how folks have modified the parking brake cross member to attach to a transmission rear support cross member.

'64C20 · 01-05-2023, 10:37 PM

Quote:

Originally Posted by scottofksu

I think most folks go to an adjustable transmission cross member similar to what is used in newer RWD vehicles (i.e., one that mounts to a bushing near the tail shaft of the transmission). I personally went this route, not because I swapped front ends, but because I couldn't find a bell housing for the T56 I purchased for my truck that would utilize the factory transmission mounts. The one problem you may run into is that using such a cross member for the transmission usually requires you to reconfigure your parking brake setup since they both go in the same area. I have seen a posting in the FAQ about how folks have modified the parking brake cross member to attach to a transmission rear support cross member.

Thanks for the response! After I posted this the wheels started to turn and I ordered an adjustable mount.

01-02-2023, 04:57 PM	#1
'64C20 Registered User Join Date: Jul 2022 Location: Northern CA Posts: 9	64 C20 with 73-87 Front end Swap Question So I swapped a 73-87 C10 front end under my C20. I initially did this because I thought it would be cheaper than buying the 8-lug disc brake kit. Anyways, now that everything is in, the trans mount for the SM420 bell housing is off by maybe an inch or so. I utilized the clamshells instead of the pedestals due to the fact that I want to swap a big block into it in the future. Has anyone run into this? Idea was to use an adjustable trans mount and make a plate for the back of the trans. Last edited by '64C20; 01-02-2023 at 05:58 PM.

01-03-2023, 03:25 PM	#2
scottofksu Registered User Join Date: Nov 2011 Location: Omaha, Nebraska Posts: 437	Re: 64 C20 with 73-87 Front end Swap Question I think most folks go to an adjustable transmission cross member similar to what is used in newer RWD vehicles (i.e., one that mounts to a bushing near the tail shaft of the transmission). I personally went this route, not because I swapped front ends, but because I couldn't find a bell housing for the T56 I purchased for my truck that would utilize the factory transmission mounts. The one problem you may run into is that using such a cross member for the transmission usually requires you to reconfigure your parking brake setup since they both go in the same area. I have seen a posting in the FAQ about how folks have modified the parking brake cross member to attach to a transmission rear support cross member. __________________ Travis' Tribute Truck - 65 C10 Frame Up Restoration http://67-72chevytrucks.com/vboard/s...d.php?t=495073



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