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Old 03-20-2017, 12:05 AM   #1
Wtroger
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Sm465 swap

I am putting a sm465 in a 1978 c20. It was a th400 that tranny is toast. My question is can I use the th400 tranny cross member and just move it forward.
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Old 03-20-2017, 12:22 AM   #2
mongocanfly
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Re: Sm465 swap

There was a thread going on about that and I think that's what they did..now just my 2cents..unless you already have that muncie I would look into a nv4500 if money and availability allow..
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Old 03-20-2017, 12:26 AM   #3
mongocanfly
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Re: Sm465 swap

I just went looking for the post but he was going from a t400 to a nv4500 and moved his foward...not a sm465..I went from a sm465 to a nv4500 and had to move mine back a inch and a half
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Old 03-20-2017, 01:20 AM   #4
Wtroger
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Re: Sm465 swap

This is being done on the cheap. I have had the tranny for years. I have at least two pedal assembly's and rods. I have a bell housing. I have the tranny in and have it setting on the existing cross member. What I don't have for what ever reason is the bell crank.
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Old 03-20-2017, 01:42 AM   #5
mongocanfly
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Re: Sm465 swap

Should be easy enough to come up with the bellcrank..don't forget the pivot ball on the frame when you go looking for a donor
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Old 03-20-2017, 10:35 PM   #6
Wtroger
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Re: Sm465 swap

Got a bell crank looking for the frame bracket. The one still on the frame I have doesn't look like the one I need. What I see is something called a Cth-18. The one I have got is rivetd on and is cupped where the bracket comes against it and has a fairly large through hole
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Old 03-20-2017, 10:35 PM   #7
Wtroger
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Re: Sm465 swap

I can probably fab one.
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Old 03-21-2017, 02:33 AM   #8
Wtroger
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Re: Sm465 swap

I think this is the frame bracket I need http://forum.73-87chevytrucks.com/sm...ach=3599;image
Any body know the part number or where to find one
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Old 03-21-2017, 04:08 AM   #9
mongocanfly
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Re: Sm465 swap

If the bracket on your frame is still riveted on then there's a high probability that its correct..is the ball stud still on it?
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Old 03-30-2017, 08:11 PM   #10
Wtroger
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Re: Sm465 swap

I used the bracket off the salvage frame I have. It finally rained here so I was able to cut the frame around the bracket with a torch then grind the rivets off and get it apart these are on there tight. This bracket is pretty much unobtainable except maybe salvage. So here is s slightly technical drawing of this bracket it drawn off the original part on to an 8 1/2 x 11 sheet of paper. I hope this might help some one else if they wind up having to make one.[IMG][/IMG]

Last edited by Wtroger; 03-30-2017 at 08:17 PM.
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Old 03-30-2017, 10:30 PM   #11
franken
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Re: Sm465 swap

Back when I had the 69, I had a crossmember that was simply channel steel. As I swapped various engines/trans in the truck, the CM was moved, and cut as needed (for clearance) with a a torch. I never had a problem w/ vibration or anything.
This was a working truck so today's cosmetic questions weren't an issue at the time.
The point being, you can do anything you want...
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Old 04-01-2017, 01:31 AM   #12
Wtroger
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Re: Sm465 swap

Managed to score the correct cross member commonly Called the W cross member at a salvage yard I use a lot. They had a 1978 1 ton that was a 4 speed truck. It was scheduled to be crushed before dark. Got lucky on that one. Also picked the bell crank and frame bracket off it also. All for. $20. It was a good day
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