BUY­ING A USED JERICO DOGBOX

NZ Performance Car - - Contents -

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.

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