4 replies to this topic

[Nathan1293]

Hi All

 

i am rebuilding my straight cut gearbox, it currently has a Quaife 3.9:1 crown wheel and pinion. I want to keep this ratio I wondered if anyone has any experience with the Quaife one (sold via Swiftune now) and the KAD one.

 

Mine looks fine, but I’d like to replace as the pinions fatigue and fail. I don’t want to risk it.

 

cheers for any help.

[nicklouse]

Go for either just make sure the bolt pattern matches diffs.

[bpirie1000]

What are you going to use the car for? Makes so much of a difference to how to guide you..

Granny going to the shops weekly is very different to a hill climbing fire breathing beast...

[Nathan1293]

The diff ratio is fine, it’s in a six speed, so 5th is close to 3.4 then there is sixth. The diff is a Quaife atb, and already has the LSD style crownwheel. The planned power band this diff will be a good compromise.

[Spider]

I designed and had made better final drive gears to get away from the fatigue issues that they suffer from, but not in that ratio.

The KAD one I know are made from better steels than the factory items (and while the factory items where quite good, but not the best available).

All you can do if you are putting out big power and the drive line had regular impact loading (hard starts, round road surfaces etc) is replace them periodically.