I currently have the 428 from my 59 all apart, and since the Toploader 4 speed is also out, considering something better on the freeway. My normal rear is a 31 spline Detroit Locker, which I want to retain. Since many of the events around here require at least an hour or more of freeway speeds, I want to have something with overdrive. I am mostly considering either a new Tremec TKX 5 speed, or adding a Gear Vendors overdrive unit to my existing toploader , which is a small spline wide ratio unit. Both the TKX and GV are pretty close in price, although the TKX will require an adapter spacer to use my factory bellhousing, plus a new clutch disc, and possibly a different shifter to avoid cutting a different hole in the tunnel, and a new carpet set, as well as modifying the trans crossmember and mount, and possibly the floor/tunnel to make it fit. I also want to keep my factory mechanical clutch linkage. Has anybody actually install a TKX in their FE powered vehicle, and have some real life driving impressions, and advice on what needed to be modified to fit in an older car.
Also interested in hearing any similar impressions about a Gear Vendors unit, for fitment and function. The car is mainly a street car, but will see dragstrip duty, with slicks, at least twice a year.
Perceived pluses for the TKX is a brand new transmission, likely a bit lighter, plus the Toploader could be sold to help offset the cost of the TKX, or used in another car, but having heard how other Tremecs don`t like full throttle power shifting at the track is a concern, as is concern over shifter position, possible floor cutting, trans mount fitment, and the need for a new clutch, or at least, a new disc.
I love the way my Toploader shifts, how the Hurst Super Shifter looks , plus I already have it, and it works well. But I have to wonder if the Gear Vendor will require tunnel/floor surgery, if the extra length behind the trans crossmember will cause issues with driveshaft /pinion angle issues, and require modifying my existing exhaust system to make it fit. Anybody have any thoughts on either, or both scenarios?