| The posted price is for the units with 3.36 gearing. That is the stock gearing used on all z's from 70-74 regardless of model. Some 74-260 2+2 with manual transmissions used the R200 but they still used the 3.36 gearing. The core charge must be returned to us within 60 days. That period starts from the day it was shipped out by us to you. All cores are subject to inspection and if there is gear damage, then the core will not be refunded. The core charge will be added to your order automatically by our store at the time you finalize your order. These are used differentials and carry a 120 day warranty starting from the date on the receipt. Sometimes we do have other gear ratios available but they do cost more and are subject to availability. R180 with 3.55 gears sells for 450.00 R180 with 4.11 or 4.38 gears sells for 650.00 We now sell an LSD conversion kit for both models of z car differentials. See listings. Last update 07/11 | 
