The Dodge Challenger Message Board

I am installing now GV overdrive unit and come across following problems :

1. I have the unit with autoshift electronics and it seems i do not need speed sensor (that was not included) my speedo cable is to short and i can not connect it with GV unit.

2. I need to change speedo gear to grey 44 teeth type. The speedo gear shaft does not slide into GV adapter is about 0,5 mm to thick, is it normal and i should just use some sand papaer on it ?

3. Even if i fit it, I am afraid speedo gear is much bigger than original 36 teeth unit. In 727 you can adjust the distance between geers by rotating the sppedo adapter in GV unit it seems it is impossible, as speedo adapter is a perfect circle with shaft in the middle and also fits only in one position.

Does anybody has a solution ?

Wojpi wrote:I am installing now GV overdrive unit and come across following problems :

1. I have the unit with autoshift electronics and it seems i do not need speed sensor (that was not included) my speedo cable is to short and i can not connect it with GV unit.

GV normally supply a speed sensor and that comes with an extra length of speedo cable. These are also used to extend your existing cable.

2. I need to change speedo gear to grey 44 teeth type. The speedo gear shaft does not slide into GV adapter is about 0,5 mm to thick, is it normal and i should just use some sand papaer on it ?

Mine came pre-assembled. It should look like the image below. I would not try to make it fit. I think they have sent the wrong bits.

3. Even if i fit it, I am afraid speedo gear is much bigger than original 36 teeth unit. In 727 you can adjust the distance between geers by rotating the sppedo adapter in GV unit it seems it is impossible, as speedo adapter is a perfect circle with shaft in the middle and also fits only in one position.

They supply the correct gear as long as you supply them with the information about rear tyre size and axle gear ratio.

Re-read the section of my instalation of these parts. http://challenger.mpoli.fi/forum/viewto ... 0904#10904

I think you need to contact them and find out if they have sent the correct parts.

Thanks Dave,

Thay hae not sent me correct parts, speedo sensor is missing so can not connect two speedo cables.They ask 100 USD for it

Hoasing is not correct either they ask 110 USD.

Very nice as you spend 3000 USD and they ask for more. We will see.

You need to talk to someone else there. No way should you need to spend more money. The price for the kit includeds EVERYTHING needed for complete installation.

For anybody else trying to fit GV overdrive please note that TTI exhaust with X pipe will not clear it.

Wojpi wrote:For anybody else trying to fit GV overdrive please note that TTI exhaust with X pipe will not clear it.

H-pipe TTI will not fit with the overdrive either which is why I had to cut my new exhaust system into about 20 bits and re-weld it all back together again.

At the time TTI were making a Charger exhaust for cars with a GV unit. I don't know if they have started doing one for the E-Body yet?

Just answered my own question. Yes TTI now do a version for GV overdrives.