I can't find detailed information about the AV shift mod, not even from
Antivenom's web site. Can anyone who has it explain what it is, how it improves shifting performance? Was it worth the $60?

 

Have you tried searching the forums? I think it's discussed pretty regularly. I also think you can accomplish it for a lot less with hardware store parts. I'll see if I can find you some links.

*edit* Have you seen this one?

http://forums.corvetteforum.com/show....php?t=1464382

Good luck!

 

Thanks for the info. By the way, nice car! Looks better than Supras, in my opinion. I'm still waiting to get pulled over for not having my front plate on too.

 

1. It is an aluminum bolt that replaces the spring loaded detent pin bolt on your transmission.

2. It makes the shifting less notchy by removing detent action.

3. No!!!

Everyone has their opinion on this subject, probably split 60/40 for the Antivenom mod. I am in the minority. I think $60 for an aluminum bolt that costs about a buck or two(probably less than $1) to make is way too much. I know that when I worked at a motorcycle shop as a parts person I saw the cost on Honda and Kawasaki nuts and bolts. They almost always cost less than $1(wholesale shop cost), some cost less than 1 cent. They would normally retail anywhere from .10 to $1.00. Of course if they were something special like high grade engine assembly bolts they could cost a lot more. The Antivenom bolt replacement is a simple aluminum bolt. It does make shifting easier, but is simply way over priced. A perfect example of Corvette tax.

When I first got my car I was intimidated when I read about the "shim" mod which kind of does the same thing. After I purchased the Antivenom bolt and saw what it did I became familiar with how it works. I then did the shim mod and I like it better. Basically you take out your stock bolt, go to the hardware store and get a washer that fits to space the bolt out farther. The spring pressure on the detent is reduced and you still have some of the notchiness, but it is reduced. I couldn't find a metal washer that fit so I ended up with a plastic one that fit fine. It cost .60.

You choose, $60 for the Antivenom bolt, or .60 for a washer. Here's another option. I'll sell you my Antivenom bolt for $30 shipped. That's 50% off, a good deal in anyone's book.

You can try it for half price and decide for yourself.

PM me if you want it.

Dog

 

Just for future reference -- use search function. Go to "search" in button bar at the top of each Forum page. Type in "antivenom". Click go and you come up with 15 threads. Most topics have been discussed over and over on here.

BTW, I think the correct name of the company that makes the bolt modification is Venom, not Antivenom. The solution that folks here came up with, putting a washer under the head of the stock bolt, is called the "Antivenom" modification. Venom. Antivenom. Got it??

Have fun. It's an easy mod. Just pull the bolt out, go to your local auto parts or hardware store, get a washer, put the thing back in and less notchiness. Piece of cake.

 

 

Actually, the name of the company is "Antivenom" and he is located in Seffner, Fla. I duplicated the solution with a washer, too. Worth it if you are installing a washer, not worth it though if you are buying a $60 bolt.

 

No problems with no front plate on numerous sports cars for about 8 years and counting <knock on wood>.

 

I paid the $60 for the Antivenom mod and I'm happy with it. I know I could have put some washers in there and had the same results but I thought he deserved some money for coming up with the idea.

 

There were people using washers long before he came up with the idea of charging $60 for a bolt.

 

Interesting. There is a company called Venom out there that makes a lot of aftermarket parts for cars, especially high performance cars. Guess I was wrong. The second time in my life. The first time I thought I was wrong, but I made a mistake.

 

I've heard that the washer must be copper. Is that not the case?

 

I didn't use copper and I don't loose any fluid.

 

Anti-Venom mod:

You need:
- 15/16" socket and wratchet with approx 4-6" extention
- 3/4" ID brass washer approx 1/16" thick (typically a drain plug washer)
- rat tail file

There is a neutral detent plug that adds additional force between shifts. It is a brass plug with a spring loaded ball bearing in the end of it that pushes on some part of the transmissoin, I don't exactly know what. I am sure in the stock form this added pressure is needed so you can feel the shift gates and neutral, but with a short-shifter it's too much. If you shim this plug it dramatically smoothens and decreases the effort needed to shift.

If you look high up on the passenger side of the transmission there is a brass plug with a slightly raised round center. Take this plug out and add the washer to it, you may need to bore the center with the rat tail file to make it fit over the bolt depending on the exact size you got. Clean the surface of the trans, bolt and washer and re-install the bolt with the washer. That is it! Now go test the feel of your shifter and bask in the glow of easy, quick and precise shifts.

I also suggest performing the shift box linkage adjustment while you are replacing the stock shifter, it will also help smooth shifts out.

Another thing that I did recently was add dynomat to the shifter, center console, and the rubber cover that goes over the top of the torque tube. This got rid of quite a few rattles, reduced a bit of the noise coming through the torque tube, and redced the heat being transferred up through the console.

 

Where is the bolt located on the transmission ? I have glanced at it a few times and never saw where it was. Any pics ?

 

Just did it. You can't see the bolt, you gotta feel for it. It's up on the upper half, passenger side, near the back where it meets the differential. You can tell it's the right one because it'll have a small protrusion from the bolt head.

I used a shim that was about .080" -- and it's way too loose for my liking. I think a .050 or .060 would be about right. Now the hunt for my new shim begins

Anyone by chance have a part no from Autozone/O'Reillys/Napa/etc? I have been to all the places once and they all have no idea what I'm talking about... they keep asking me what car it's for... idiots...

 

Just get yourself a variety of drain plugs with different thicknesses. You say it was way too sloppy, do you have the stock shifter or an aftermarket? I think this mod will make things way too sloppy with the stock shifter, and makes them just right with an aftermarket short-throw shifter...

 

$60 is way too much for what he does, I was gonna buy it when I knew nothing about this mod, then after doing some reasearch I have decided to go the washer route. Many guys from z06vette.com say a .070 washer is perfect. I don't think this dude should charge 60 bucks for a bolt, he should just be happy a modification was named after him!!!