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Affordable Smaller Bolt-On Overdrives


Guest Mike

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Yes, I searched;-)

 

I'm looking for bolt-on overdrive options. I'm aware of the Gear Vendors and US Gears units. Those are too pricey and too large (long). Besides those are rated to tow THIRTY THOUSAND POUNDS. I just don't need THAT much durability.

 

Are there any units that are more affordable and smaller... adaptable to a 4L80E transmission? Yes, I know this is already an OD transmission:-D However, I have 3.9:1 gears and the existing OD is only .75:1 which gives me a final ratio of ~2.90:1. I'd like to get my final ratio above 2.4:1. An auxiliary .75 OD will provide a ratio of greater that 2.2:1, which would be ideal. Maybe there are older systems available that can be cannibalized/modifed??

 

Important Information:

1. Car is a 260

2. Future upgrades are 434 stroker w/ ~600WHP/600 torque

3. Currently has the Scarab style kit but am updating to the JTR UNLESS this affects ability to ad the extra OD

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Thanks Jake. Yeah, the way I understand it, the GV and the USG are both old designs. This doesn't make them bad. I don't believe "old" necessarily means bad. However, they're WAY OVERBUILT for use in a daily driver. They're more appropriate for large motor homes, rock climbers, and 1000+ HP monsters. I just can't believe there isn't something smaller/lighter/affordable. I'll bet ten dollars to one donut that there is something out there adaptable for our needs.

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Actually the Laycock design was used behind many much smaller and less powerful powertrains in the European vehicles.

I believe they were uses in Jags, Triumphs, and other smaller type cars.

There were several different variations. I think the GV is the "J" type.

 

I think GV has simply taken the J box, and made it adaptable to many American transmission setups.

 

They also hold the patent to do so....

 

If I ever run out of stuff to do, maybe I'll build an OD box using the OD setup from the front of a 4L80 :)

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