PRICING INFO- $5410 in parts & approximately $3500 for transmission re-build (email for further info about shipping to us).
The most common complaint among journalists and enthusiasts for the GT4 is that the gears are just too long for the 3.8L engine in this chassis. The ideal solution would be a complete re-gearing of 1st through 6th gears. However, that comes at an enormous cost for small batch parts and engineering 1st and 2nd gears will likely not be an option for years, if ever.
We have tested re-gearing on our own project GT4 and have settled on a solution that changes 3rd, 4th, and 5th gears to shorter, closer ratios (approx difference is 14% in 3rd, 18% in 4th, and 16% in 5th). This allows shifting to 3rd gear sooner when needed, or staying in 2nd til the normal shift point and jumping to a better position in the powerband in 3rd, and staying in 3rd gear in more situations (ie mid-low speed corners) with improved acceleration. By shortening 3rd, 4th, and 5th gears, you have closer ratios and stay in the powerband longer through typical top speeds, and will be able to retain the original freeway overdrive gear, since 6th gear is unchanged.
Video Review of SharkWerks GT4 on DRIVETRIBES:
We also recommend replacing the flywheel with our single-mass lightweight variant and sport clutch when installing this upgrade for maximum performance, especially in 1st and 2nd gear. Click here for more info.
Price includes replacement gear price (parts), and labor for disassembly and installation of replacement gears in transmission. Price does not include shipping (freight, approximately $200 each direction), removal and installation of transmission, or repairing of other problems with the vehicle (ie, repairing gear synchros, replacing clutch etc.). This upgrade has no effect on the "Sport" mode rev-matching downshift ability of the GT4.
We recommend transporting your vehicle to Shark Werks (in Fremont, California) for the removal of the transmission, and installation of the gears. Alternatively, the transmission can be transported and we can rebuild and return your unit. Please contact us for more details.
You can see this product installed on cars in our project gallery: