Q45 vs 300ZXTT
|
|
|
|
|
|
| Differential Dilemma Q45 vs 300ZXTT |
|||||
| On the left is the differential from a '92 Infiniti Q45 and the one on the right is from a 1994 Nissan 300ZX twin turbo. The Infiniti diff is 3.54:1 and the Nissan is 3.7:1. Both are viscous limited slip. Many people believe thes differentials are interchangable. They are not. Although both diffs use 6 bolt flanges to mate with cv shafts, the pinion end of the Nissan diff is 6 bolt, and the Infiniti is 4 bolt. Both of the front and rear mouning locations of the Nissan unit spread wider. The flange to flange widths on both diffs are relatively the same, with the Nissan diff being less than 1/4" wider overall, or ~1/8" per side which can be handled by the cv joints. Still, mounting will be a custom job if you plan to swap these two units. | |||||
|
|||||
| The rear covers cannot be swapped because they are different sizes and the bolt patterns are different. The ABS senders on both units are also different. The Nissan unit uses two senders and the Infiniti diff uses one up front. Length of the cases and distance front to back between mounting points is the same. The snout of the Nissan diff is slightly larger and longer. I will be welding in custom mounts. The Nissan unit is and R230 with a 230 mm ring gear which is roughly 1/16" larger than the Ford 9". It is a viscous limited slip and a great ratio for my application. I was dismayed when I got the 300ZX diff, because the mounting was different, and I had already custom fit the subframe to my car. Now that will have to be modified. While it is out, I will be installing polyurethane bushings and adjusting the pinion angle. Next step will be fitting a custom drive shaft. Then I should be on the road. | |||||
|
|||||