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Username Post: TH350 to TH400 Swap?        (Topic#374786)
fritz1990 
Silver Supporting Member
Posts: 6624
fritz1990
Age: 62
Loc: Kansas
Reg: 02-16-03
04-02-24 04:32 PM - Post#2868542    

Just need to confirm what I saw and read regarding the swap.

My question is about the frame mounts for the cross member. From what I've seen and read the frame mounts for the 400 appear to be on the same plane as the 350 mounts? I mean the same distance from the ground. The same height as the 350 mounts, just farther back?

Regards, Jeff

1998 K1500 6.5 Coal burner
1965 C10 with 498 BBC AFR Heads
1964 C10 Ran 348W for 6 years, now SBC.

Corvettes owned: '74 '77 '78 L82 Silver Anniversary, 2002 LS1, 2007 C6 Love this one! Now have 2014 C7

Don't have a nervous come together!



 


toro455 
"8th Year" Silver Supporting Member
Posts: 1192
toro455
Loc: Western NY
Reg: 06-15-02
04-02-24 08:38 PM - Post#2868544    
    In response to fritz1990

Jeff,
You are correct. Look for posts from me. There was a guy who was doing a swap to the TH200-4R recently in the 65-66 section and that transmission uses exactly the same mount position as the TH400. It's late tonight else I would search and post photos here.

Scott



 
fritz1990 
Silver Supporting Member
Posts: 6624
fritz1990
Age: 62
Loc: Kansas
Reg: 02-16-03
04-02-24 09:13 PM - Post#2868545    
    In response to toro455

No your reply is fine. I have the brackets made just need to weld them in. Just wanted to make sure what I read and seen was correct.

Thank you!

Regards, Jeff

1998 K1500 6.5 Coal burner
1965 C10 with 498 BBC AFR Heads
1964 C10 Ran 348W for 6 years, now SBC.

Corvettes owned: '74 '77 '78 L82 Silver Anniversary, 2002 LS1, 2007 C6 Love this one! Now have 2014 C7

Don't have a nervous come together!



 
toro455 
"8th Year" Silver Supporting Member
Posts: 1192
toro455
Loc: Western NY
Reg: 06-15-02
04-03-24 05:34 PM - Post#2868551    
    In response to fritz1990

Sounds good. The member I was referring to is Rick "ParkRNDL" and here's a link to his thread:
https://www.chevytalk.org/fusionbb/showtopic.php?t...

At some point we need to measure the distance between front an rear mounts. I think the most reliable position to measure would be front hole to front hole of the second mount (or rear to rear).

I let the transmission be my guide for placement. Rick was hopefully going to be able to do the same.

Scott



 
fritz1990 
Silver Supporting Member
Posts: 6624
fritz1990
Age: 62
Loc: Kansas
Reg: 02-16-03
04-03-24 06:25 PM - Post#2868554    
    In response to toro455

I just came in from welding my brackets and measured exactly as you did. Looks nice and don't see any problems, except one...

I noticed the shifter linkage at the trans is not lined up with the TH400, looks to be off an 1" or so.

Didn't have time to mess with it tonight but thinking just make a bracket and move the TH350 bracket back a ways?

Open to suggestions.

Thank You!

Regards, Jeff

1998 K1500 6.5 Coal burner
1965 C10 with 498 BBC AFR Heads
1964 C10 Ran 348W for 6 years, now SBC.

Corvettes owned: '74 '77 '78 L82 Silver Anniversary, 2002 LS1, 2007 C6 Love this one! Now have 2014 C7

Don't have a nervous come together!



 
toro455 
"8th Year" Silver Supporting Member
Posts: 1192
toro455
Loc: Western NY
Reg: 06-15-02
04-03-24 07:28 PM - Post#2868555    
    In response to fritz1990

Jeff,
The linkage for mine was lost. I ended up buying replacement linkage for the TH400 from another member (Brett B) to use with the TH200-4R. Unfortunately I have no comparison point.

If you have some photos of your set-up maybe I can see if mine looks the same.

Scott



 
fritz1990 
Silver Supporting Member
Posts: 6624
fritz1990
Age: 62
Loc: Kansas
Reg: 02-16-03
04-03-24 09:16 PM - Post#2868560    
    In response to toro455

I'll take a good look at it tomorrow. I just didn't have time to look, only to see that it was off. I'll figure it out.

Regards, Jeff

1998 K1500 6.5 Coal burner
1965 C10 with 498 BBC AFR Heads
1964 C10 Ran 348W for 6 years, now SBC.

Corvettes owned: '74 '77 '78 L82 Silver Anniversary, 2002 LS1, 2007 C6 Love this one! Now have 2014 C7

Don't have a nervous come together!



 


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