Critiquing A Build

Drivetrain Modifications


Upgrading your drivetrain not only serves a purpose if you are building a track or performance-oriented vehicle, but also if you are building a show vehicle with performance-oriented modifications like a motor swap, turbo kit, or supercharger upgrade. Since most of the drivetrain items are not visible for the judges to observe, it is highly recommended that a vehicles owner has photos and receipts of the modification made to the vehicle’s drivetrain. The judges will evaluate whether you installed a short shifter for quicker shifts, upgraded shifter bushings, if you changed out your internal gears in the transmission for desired racing, drag, or time attack. They will question if you changed your transmission gears to straight cut (dog box) gears for extreme power applications. Other drivetrain modification that the judges will look for will include but are not limited to upgraded half shafts for better durability in high horsepower applications, replaced driveshaft for added strength and/or reduced weight, and upgraded differential(s) for better power application to the ground. They will also check to see if you upgraded clutch to a puck or multiple disks for better power handling, if you changed the rear ring and pinion for a different gear ratio, if you swapped your transmission set-up from a 5-speed to 6-speed, if you swapped out your hubs from a 4lug conversion to a 5lug set-up, if you upgraded your ECU for automatic transmission, if your torque convertor was upgrade for automatic transmissions, if you added a transmission cooler for better transmission durability, if you cryotreated your gears for better strength or you if upgrade you transmission fluids for better shifting.

Even though most drivetrain modifications aren’t visible to the human eye that does not mean that the judges will overlook those modifications. The NCCA criteria are all about fabrication, fitment, and most importantly in the case of the drivetrain form and function.   Build book with lots of photos are a great way to show the judges just how much detail went into your drivetrain 

   Copyright 2019 by NCCA. All rights reserved. No part of this book may be reproduced, translated, transcribed, or stored in a retrieval system in any form electronically, mechanically, or through photocopying without the prior written permission of NCCA.      

Joe Courtney's 1969 Chevrolet Camaro built by Ai Design.  Photo by John Machaqueiro

Joe Courtney's 1969 Chevrolet Camaro built by Ai Design. Photo by John Machaqueiro