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Patching trans tunnel?

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Old Oct 3, 2022 | 11:47 AM
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Default Patching trans tunnel?

What’s the best diy option to patch my trans tunnel from my t56 swap? I’ve never worked with fiberglass but I’ve read a fiberglass kit or smc kit should work? Or can I rivet a piece of sheet metal in place?
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Old Oct 3, 2022 | 12:53 PM
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How big is the hole?
Is the hole shaped in a curve like the tunnel or is it flat?
Is the finished location going to be visible or covered?
I have done a lot of glassing of boat transoms and stringers with polyester resin and glass mat. Messy, but strong.
I like working with epoxy resin the most.
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Old Oct 3, 2022 | 01:42 PM
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I used a piece of stainless steel that I had already but aluminum should work also. I pop riveted it into place and sealed around the edges. It's covered with carpet so you can't see it.
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Old Oct 3, 2022 | 08:01 PM
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Originally Posted by DWAVette
How big is the hole?
Is the hole shaped in a curve like the tunnel or is it flat?
Is the finished location going to be visible or covered?
I have done a lot of glassing of boat transoms and stringers with polyester resin and glass mat. Messy, but strong.
I like working with epoxy resin the most.

Dont have any pics but it’s pretty damn big. Lol it’ll be covered with the carpet but still it’s big enough that I’d like to fix it the correct way.
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Old Oct 3, 2022 | 08:02 PM
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Originally Posted by DWAVette
How big is the hole?
Is the hole shaped in a curve like the tunnel or is it flat?
Is the finished location going to be visible or covered?
I have done a lot of glassing of boat transoms and stringers with polyester resin and glass mat. Messy, but strong.
I like working with epoxy resin the most.
ive never played with anything like that or body work. Is it beginner friendly?
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Old Oct 3, 2022 | 08:03 PM
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Originally Posted by RWDsmoke
I used a piece of stainless steel that I had already but aluminum should work also. I pop riveted it into place and sealed around the edges. It's covered with carpet so you can't see it.
ok this sounds like the easiest approach-so no issues riveting metal into the surrounding fiberglass?
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Old Oct 3, 2022 | 08:03 PM
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Originally Posted by RWDsmoke
I used a piece of stainless steel that I had already but aluminum should work also. I pop riveted it into place and sealed around the edges. It's covered with carpet so you can't see it.
How did you seal the surrounding areas?
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Old Oct 4, 2022 | 12:37 AM
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can we see pics?

personally i would build a template shape from cardboard, then woukd use smc compatible resin to make the shape, and then smc panel bond to bond it to the tunnel. you can predrill holes for rivets but use smc compatible panel bond as the true fastner.
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Old Oct 4, 2022 | 02:47 PM
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If you go with fiberglass, use West System epoxy resin. This will bite to almost anything, no fumes, and is not flammable. If you have access to both sides, use blue tape, cardboard, and wax paper to cover the hole from the underside in the shape you want (after of course prepping the inside for adhesion) lay up the glass 1 layer at a time until you get the thickness, and strength you want. From there undercoat the underside, and seal the inside if you want.
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Old Oct 4, 2022 | 03:55 PM
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Originally Posted by Armybyrd21
How did you seal the surrounding areas?
Yes I riveted to fiberglass with washers on the fiberglass side. Sealed edges with seam sealer.
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Old Oct 4, 2022 | 06:07 PM
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I have used epoxy and poly resin successfully in strength critical applications. Cost is the big factor. Epoxy is pricey, but really good. Since your job is not large, I would go with epoxy with a couple of layers of fiberglass mat where the strands are randomized. Like Foster said, epoxy has excellent adhesion. If you do it right, this would give you the most strength and durability. I would do it like Foster says.
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Old Oct 4, 2022 | 06:21 PM
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be sure to ask west or whoever supplies you, if the product is compatible with smc (as opposed to fiberglass). wont get into details here but just be sure to double check this.
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Old Oct 5, 2022 | 03:24 PM
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Here are pictures of how I made the ZF Swap myself. I didn't want to use a sheet metal, I wanted to make it as original as possible.
From post 27

https://www.corvetteforum.com/forums...ne-mods-2.html
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Old Oct 5, 2022 | 06:50 PM
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Dug up some pictures of the project, used JB Weld Plastic Weld (black material) and a donor ZF Trans tunnel.
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Old Oct 5, 2022 | 09:41 PM
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Originally Posted by AZSP33D




Dug up some pictures of the project, used JB Weld Plastic Weld (black material) and a donor ZF Trans tunnel.
pro. nice work and thnx for posting pics
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Old Oct 6, 2022 | 06:49 PM
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Originally Posted by AZSP33D




Dug up some pictures of the project, used JB Weld Plastic Weld (black material) and a donor ZF Trans tunnel.
what shift boot is that?
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Old Oct 6, 2022 | 06:53 PM
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Originally Posted by RWDsmoke
Yes I riveted to fiberglass with washers on the fiberglass side. Sealed edges with seam sealer.
any pics?
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Old Oct 6, 2022 | 06:54 PM
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fyi i saw on mirrock corvette today he sells this exact part of the tunnel for this swap. cheap too. id just buy it, and graft it in with smc panel bond adhesive and rivets.
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Old Oct 6, 2022 | 07:56 PM
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[QUOTE=VikingTrad3r;1605760746]fyi i saw on mirrock corvette today he sells this exact part of the tunnel for this swap. cheap too. id just buy it, and graft it in with smc panel bond adhesive and rivets.[/QUOTE

believe he has a zf6 tunnel on eBay right now-not sure how similar it would be
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Old Oct 6, 2022 | 07:56 PM
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Originally Posted by AZSP33D




Dug up some pictures of the project, used JB Weld Plastic Weld (black material) and a donor ZF Trans tunnel.
How did you figure out the location for the ZF tunnel piece? I only ask because I will be starting the ZF swap (for the old 4+3) in my 85 in a couple if weeks.
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