Nissan Titan Forum - View Single Post

bestatchess · 07-16-2007, 08:16 AM

As you probably know, there are only two ratios available for the Titan. Changing one to another would require that you have a ring and pinion for the other ratio. AFAIK, Nissan doesn't sell the ring and pinion apart from the entire rear axle assembly.

Assuming you came up with a ring and pinion somewhere (Ebay, dumpster diving at the dealer), and you got whatever necessary parts are required to mount the new pinion (shims? crush spacer? seal? - refer to service manual), there would still be potential issues with speedo, ECU and transmission control electronics (shift points, etc.), although, depending on the size of your tires relative to stock, these might be canceled out to some extent.

Since you are 4 x 2, you don't have to worry about matching the ratio in the front diff.

Somebody else recently posted about changing the center section of the rear axle housing (pumpkin) with the center section from a Dana 70u which reportedly uses the same spline count and diameter axles. This would be more involved as far as removing the axle tubes and welding them on to the 70u center section, but, if feasible, allow a wider variety of gear ratios.

Finally, it has been reported (which doesn't mean that it will happen soon) that new gears and ratios from aftermarket mfgs for the Titan are in the works.

Also, it has been reported that the 2008 rear diff uses stronger axle shafts. I have not seen any specifics relative to diameter and spline count.

07-16-2007, 08:16 AM	#3 (permalink)
bestatchess Super Moderator iTrader: (2) Join Date: Feb 2004 Posts: 9,286 Thanks: 3 Thanked 30 Times in 25 Posts	Re: TruTrac with Ring & Pinion Options As you probably know, there are only two ratios available for the Titan. Changing one to another would require that you have a ring and pinion for the other ratio. AFAIK, Nissan doesn't sell the ring and pinion apart from the entire rear axle assembly. Assuming you came up with a ring and pinion somewhere (Ebay, dumpster diving at the dealer), and you got whatever necessary parts are required to mount the new pinion (shims? crush spacer? seal? - refer to service manual), there would still be potential issues with speedo, ECU and transmission control electronics (shift points, etc.), although, depending on the size of your tires relative to stock, these might be canceled out to some extent. Since you are 4 x 2, you don't have to worry about matching the ratio in the front diff. Somebody else recently posted about changing the center section of the rear axle housing (pumpkin) with the center section from a Dana 70u which reportedly uses the same spline count and diameter axles. This would be more involved as far as removing the axle tubes and welding them on to the 70u center section, but, if feasible, allow a wider variety of gear ratios. Finally, it has been reported (which doesn't mean that it will happen soon) that new gears and ratios from aftermarket mfgs for the Titan are in the works. Also, it has been reported that the 2008 rear diff uses stronger axle shafts. I have not seen any specifics relative to diameter and spline count.