Sm465 swap - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Wtroger · 03-20-2017, 12:05 AM

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.

**mongocanfly** · 03-20-2017, 12:22 AM

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..

**mongocanfly** · 03-20-2017, 12:26 AM

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

Wtroger · 03-20-2017, 01:20 AM

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.

**mongocanfly** · 03-20-2017, 01:42 AM

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

Wtroger · 03-20-2017, 10:35 PM

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

Wtroger · 03-20-2017, 10:35 PM

I can probably fab one.

Wtroger · 03-21-2017, 02:33 AM

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

**mongocanfly** · 03-21-2017, 04:08 AM

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?

Wtroger · 03-30-2017, 08:11 PM

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]

franken · 03-30-2017, 10:30 PM

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...

Wtroger · 04-01-2017, 01:31 AM

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

03-20-2017, 12:05 AM	#1
Wtroger Registered User Join Date: Mar 2017 Location: Caney Kansas Posts: 7	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.

03-20-2017, 12:22 AM	#2
mongocanfly Post Whore Join Date: May 2015 Location: Alabama Posts: 14,674	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..

03-20-2017, 12:26 AM	#3
mongocanfly Post Whore Join Date: May 2015 Location: Alabama Posts: 14,674	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

03-20-2017, 01:20 AM	#4
Wtroger Registered User Join Date: Mar 2017 Location: Caney Kansas Posts: 7	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.

03-20-2017, 01:42 AM	#5
mongocanfly Post Whore Join Date: May 2015 Location: Alabama Posts: 14,674	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

03-20-2017, 10:35 PM	#6
Wtroger Registered User Join Date: Mar 2017 Location: Caney Kansas Posts: 7	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

03-20-2017, 10:35 PM	#7
Wtroger Registered User Join Date: Mar 2017 Location: Caney Kansas Posts: 7	Re: Sm465 swap I can probably fab one.

03-21-2017, 02:33 AM	#8
Wtroger Registered User Join Date: Mar 2017 Location: Caney Kansas Posts: 7	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

03-21-2017, 04:08 AM	#9
mongocanfly Post Whore Join Date: May 2015 Location: Alabama Posts: 14,674	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?

03-30-2017, 08:11 PM	#10
Wtroger Registered User Join Date: Mar 2017 Location: Caney Kansas Posts: 7	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.

03-30-2017, 10:30 PM	#11
franken Registered User Join Date: Jun 2013 Location: Somewhere Posts: 3,128	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...

04-01-2017, 01:31 AM	#12
Wtroger Registered User Join Date: Mar 2017 Location: Caney Kansas Posts: 7	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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