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You are correct, a loosely thrown around interval is 5000km, but that is largely dependant on the operator. Someone who is very skilled at changing gears in an H pattern dog box will cause little to no wear on the dog teeth faces. Same thing with a sequential with correctly setup strain gauge strategies correctly unloading the gears on shift, very little dog wear will occur. On the flip side someone just bashing a dog box around not shifting correctly will wear the flat sides of the dogs very quickly, to the point where they will jump out of gear on the slightest gear unload. This where km on box is not a good gauge for inspection, rather inspection intervals at X amount of hours, or x number events completed.

You are also correct in the dog gear replacement. The main shaft gears usually have dog teeth on the side an a separate sliding dog that matches to it. What you have to replace can only be determined on a box teardown, so it is not impossible to predict what you're likely to need. Sometimes with only slight wear on the dog teeth you can get prolong the gear or sliding dog needing replacement by regrinding the dog teeth from being rounded off to square again. This will buy you more time with needing to replace anything, but eventually round again and need to be replaced.

The biggest problem is that any of the above requires the box to be removed from the car, disassembled and inspected, possibly repaired, reassembled and reinstalled again - whether you replace anything or not. This is where the main cost in keeping a dog box alive is, not necessarily the cost of any parts that may or may not need to be replaced. When someone chooses to go dog engagement this has to be just accepted as the norm, and is the main reason why a synchro box makes more sense for a dedicated street only car.

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Thanks for the reply !  

These guys do a dog box with the rings seperate from the gears - https://www.6xdgearbox.com/

They suggest a dog is $300 ish AUD. 

 

Anything like that available for the GTR ?

 

info for anyone interested

 

 

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