BUYING A USED JERICO DOGBOX
IF YOU’RE SICK OF BLOWING OEM GEARBOXES AND HAVE STARTED EYEING UP WELL-LOVED SECONDHAND DOGBOXES, JUST REMEMBER THAT BUYING USED ALWAYS COMES WITH A RISK. WE SPOKE TO THE GUYS AT KASPA TRANSMISSIONS TO SEE EXACTLY WHAT YOU NEED TO LOOK OUT FOR
o, you’re sick of blowing OEM gearboxes, but you’re not quite sure exactly what you can or should replace them with? After eyeing up all the options, you may decide that the likes of a second-hand Jerico four-speed looks like a solid choice. It’s predominantly used in Nascar-style racing in the US, and second-hand units can be picked up for a great price from numerous sources in America as well as from local importers. However, buying second hand always comes with a risk, so we spoke to the guys at Kaspa Transmissions, who look after units for numerous D1NZ pro drivers — including current champion Curt Whittaker — to see exactly what you need to be looking out for when buying second hand.
The greatest thing about the modern world is the number of detailed photos you can get when purchasing something like this. If the seller is not willing to show you inside then walk away. Shop around, and make sure you get a good set of detailed photos, or, better yet, a video of the internals, before handing over thousands of dollars.
The best thing about these four-speeds is the fact that there is an inspection plate located on the top of the box that can easily be removed, giving a great view of the majority of the moving components. We took a look at how one works back in Issue No. 227, so check that out.
While we focus on the WC4 Jerico here, there are many other brands of near-identical design, so the information following will apply to the likes of the Tex Racing and G-Force external four-speeds as well.
IDENTIFYING YOUR BOX
There are a few different models of Jerico’s rock-solid fourspeed, and it’s important that you get the box to suit your driving. There are circuit and drag options, indicated by the model name — ‘DR4’, ‘CL4’, and ‘SC4’ being the drag versions, while ‘WC4’ indicates that that box is a circuit one. WC4 Revision 4 and WC4 Revision 4.2 are the best options, as they feature some great improvements over the early models, such as roller-pin bearings on the main shaft and rear housing, and webbed dog rings. The 4.2 version also features a bearing support on the main shaft that reduces deflection at high rpm. Identifying this is very easy, as there is a part number stamped on the top of the box near the inspection plate. What Kaspa had in the shop, and what we are looking at here, is a pair of WC4s, one being the box that took Curt Whittaker to the D1NZ championship this season.