Advise on which tunnel mod kit for LS3 w/T56 Magnum in 1st Gen? - Lateral-g Forums

ADiCarlo · #1 10-04-2015, 09:11 PM

They make there own and are not for sale off the shelf. I would call DSE direct maybe they can make you a one off.

We ended up making our own similar to what Mark Stielow did but mounted it off the subframe where he did his off the body and reinforced the metal. This required us to raise the floor panels to get optimal clearance and tucking.

Check out this thread:
https://lateral-g.net/forums/show....php4?p=617961

We had to cut a little farther forward into the tunnel to get the best clearance for the bellhousing but this wasn't required.

We're using half inch body mounts.

Haven't fitted the haymaker yet but it shouldn't interfere with the tunnel. The kicker panels with speakers may be a different story. Once I mount I can try and take measurements.

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Vega$69 · #2 10-05-2015, 06:43 AM

I used the Speedtech tunnel cover.

Worked perfect and it is for sale

My last car a fabbed my own cover. Cut the hole in the tunnel as required to position the tranny correctly, made a cardboard mock up and made the sheet metal cover.

Which is why I went with the Speedtech this time. I do have the Speedtech sub and X member.

wiedemab · #3 10-05-2015, 07:12 AM

Here is another option for you.

http://www.bbclassicsinc.com/product...-tunnel-patch/

I talked to Billy last week and ended up ordering one for my '67 Chevy II project. I'm building the floors from scratch, but this is worth it in time savings. I'll post pics in my build thread once I get it.

Nativefx · #4 10-05-2015, 09:59 AM

I was hoping to be able to use a pre-formed tunnel cover, but I'm concerned about what actually works. It seems there are a number of factors that could come into play such as body mounts being used (full or half), stock subframe compared to aftermarket, space available for exhaust, correct motor mounts, etc. I'm using my stock subframe so I'm hoping I don't have to fab a one off. The main thing is if I have to cut the tunnel I want to make sure it will be sufficient to get the correct drive line angle. I haven't bought the x member or motor mounts yet so hopefully I can figure everything out and get the right parts that will work together on my stock sub.

Quote:

Originally Posted by Vega$69

I used the Speedtech tunnel cover.

Worked perfect and it is for sale

My last car a fabbed my own cover. Cut the hole in the tunnel as required to position the tranny correctly, made a cardboard mock up and made the sheet metal cover.

Which is why I went with the Speedtech this time. I do have the Speedtech sub and X member.

Musclerodz · #5 10-05-2015, 04:11 PM

Speedtech make a complete kit to make this a very simple deal.

Nativefx · #6 10-05-2015, 05:11 PM

I wasn't sure if their kit worked with a stock subframe or just one of theirs? I've also been looking for some other threads where people were discussing some of the issues with certain tunnel mods, but i can't figure out which forum I read this in and i don't remember which they had the best luck with once everything was finished. I don't mind modifying my tunnel, but I want to make sure I get the proper driveline angle.

Quote:

Originally Posted by Musclerodz

Speedtech make a complete kit to make this a very simple deal.

Vega$69 · #7 10-05-2015, 05:27 PM

With a stock sub you will need to

#1 Cut approx 8" wide by 20" long hole in the tunnel from about 3" behind the shifter. Then lift the tranny at the crossmember to the proper angle. Build a sheet metal box as needed to cover the hole and cut out the hole for the shifter.

#2 Raise the top of the tunnel by cutting the vertical sides just below the radius and once new height is determined weld in a strip of metal on each side and boxing the ends.

#3 Skip all the crap and buy a pre-made fabbed tunnel plate.

jlwdvm · #8 10-05-2015, 06:55 PM

The Hooker system of motor mounts and cross member were a breeze to install and I didn't have to make a single dimple to the tunnel and had 3 degrees of angle to my LS3- T56 after installation.

Nativefx · #9 10-06-2015, 09:05 AM

Haha, yeah Vega$69 I'm hoping to get confirmation I can go with #3 and get all the necessary components to go in correctly!

thanks for all your help!

Quote:

Originally Posted by Vega$69

With a stock sub you will need to

#1 Cut approx 8" wide by 20" long hole in the tunnel from about 3" behind the shifter. Then lift the tranny at the crossmember to the proper angle. Build a sheet metal box as needed to cover the hole and cut out the hole for the shifter.

#2 Raise the top of the tunnel by cutting the vertical sides just below the radius and once new height is determined weld in a strip of metal on each side and boxing the ends.

#3 Skip all the crap and buy a pre-made fabbed tunnel plate.

Musclerodz · #10 10-05-2015, 07:27 PM

Quote:

Originally Posted by Nativefx

I wasn't sure if their kit worked with a stock subframe or just one of theirs? I've also been looking for some other threads where people were discussing some of the issues with certain tunnel mods, but i can't figure out which forum I read this in and i don't remember which they had the best luck with once everything was finished. I don't mind modifying my tunnel, but I want to make sure I get the proper driveline angle.

Works with stock frame. Just installed their engine mounts and crossmember with a GTO 6 speed, no tunnel mods. If you have a Magnum you will have to use their tunnel box.