T56 crossmember modifications for a 69 C3
Thread Starter
Teching In
Joined: Oct 2011
Posts: 26
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From: PA
T56 crossmember modifications for a 69 C3 I've been searching all day and haven't found much.
I have a 69 vette with the non-removable trans crossmember.
I've seen pictures of some who just cut a section out and welded in a new plate but no measurements were given and I don't want to start cutting before I'm positive.
I plan on make side pipes work later on so I don't really care about clearance issues with the exhaust tunnels.
anyone with any suggestions would be grateful.
LS1/T56 showed up Friday night so I'm in for it now. Hoping this site along with corvetteforum will get me through the build.
I have a 69 vette with the non-removable trans crossmember.
I've seen pictures of some who just cut a section out and welded in a new plate but no measurements were given and I don't want to start cutting before I'm positive.
I plan on make side pipes work later on so I don't really care about clearance issues with the exhaust tunnels.
anyone with any suggestions would be grateful.
LS1/T56 showed up Friday night so I'm in for it now. Hoping this site along with corvetteforum will get me through the build.
Thread Starter
Teching In
Joined: Oct 2011
Posts: 26
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From: PA
I'm all for that. But given my crossmember isn't already removable I'm not sure how much fab work it'll take to get the pre-made one to bolt up.
Teching In
Joined: Jul 2011
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Not really a big deal to do this. I cut mine a few years ago and never looked back. I made my own brackets, not the prettiest ones but the work very well. I just cut on the outside of the tubes and welded on brackets for the middle part of the crossmember. I thru bolted them with a plate on the front. I dud make up some tubular spacers for the frame so it would not crush. I have had my TKO and now T56 in and out so many times I lost count. It is still working very well. If you are handy with a welder it will cost nothing if you can scrounge up some steel for brackets.
If the frame is out which I see it is this will be very easy to do.
If the frame is out which I see it is this will be very easy to do.
Staging Lane
Joined: Nov 2010
Posts: 53
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From: Ozarks
I've done the swap and conversion to removable crossmember to a '67, '69 and a '72.
I don't have time to do a write up but I could PM my phone number if you want to talk about it. It's not difficult.
Kerry P
I don't have time to do a write up but I could PM my phone number if you want to talk about it. It's not difficult.
Kerry P
Thread Starter
Teching In
Joined: Oct 2011
Posts: 26
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From: PA
Not really a big deal to do this. I cut mine a few years ago and never looked back. I made my own brackets, not the prettiest ones but the work very well. I just cut on the outside of the tubes and welded on brackets for the middle part of the crossmember. I thru bolted them with a plate on the front. I dud make up some tubular spacers for the frame so it would not crush. I have had my TKO and now T56 in and out so many times I lost count. It is still working very well. If you are handy with a welder it will cost nothing if you can scrounge up some steel for brackets.
If the frame is out which I see it is this will be very easy to do.
If the frame is out which I see it is this will be very easy to do.
I'd rather not have to buy a $200+ crossmember that'll still require me to cut and modify my frame to make it fit when I could just cut a piece out and weld in the proper place.
I just don't know how deep I need to make it or the easiest way to go about it.
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Staging Lane
Joined: Nov 2010
Posts: 53
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From: Ozarks
The method in the photos is the simplest way of the three Vettes I’ve converted. This is a side exhaust car so no provisions for under car pipes were needed. After cutting the original crossmember out (including the exhaust pass troughs) I welded two heavy angles together to form a “U channel”. This was sized to fit snugly on the remaining original crossmember. I match drilled the new U channel to the original stubs of the factory crossmember (since a box section was replaced with an open U channel I increased the wall thickness of the U significantly). I also added spacer tubes inside the original box member so that it would not try to collapse when the bolts are tightened. Some trimming around the trans mount was required. The cars I’ve done were first generation engines with Viper T56s modified for use with GM. I don’t know if your mounts will line up or require an additional bracket. My transmission mounting holes were in line with the crossmember.
Kerry P.
Kerry P.
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here is my setup. Basically a wide piece of angle iron cut some. This way I can lay the crossmember on the frame without bolting it in yet. The front is just a 1/4 inch piece of flat steel. One bolt one way the othe from the front. This is an old picture with a TKO but I still use the same crossmember just modified the mount.
56, c3, conversion, corvette, crossmember, cutting, exhaust, fit, ls1, modification, modified, pic, removealbe, t56, tunnel, weld
