Best after market parts manufacture

In most cases, I would rather have a good used original CAT part than a new after market part if possible.

I don't believe there is a best "single source" for aftermarket parts.
General consensus seems to be approach major internal parts with caution. Not so critical on things like undercarriage or other external parts.

Your options will be limited for aftermarket parts, what exactly are you looking for because from my experience you can't beat Cat prices on nuts, bolts, seals, and usually gaskets like head gaskets, aftermarket bearings you can buy cheaper from Tilly's but you may not get the same strength spec bearings as originally fitted so the few extra $$$ you pay for a Cat bearing are worth it in my opinion, that happened to me on gearbox bearings I fitted to my D4 7J and luckily we noticed it when assembling the tranny, the bearing Tilly's supplied for the transmission shaft was not a high load bearing as required.

There are a lot of old D4's around Oz, put up your location so people know where you are, there might be one being wrecked near you.
Regards
Mike

Florin (USA) sell genuine Cat and aftermarket for about half the CAT list price from memory. They are a good source for harder to find parts.

I'm in Western Australia . The dozer has been sitting a round becaue the per combustion rusted out.
I have the motor out. Sump off head off. The water was in number 2 pot. Last night I got it to trun over had Diesel in the pots for about 2 weeks. Going to take out the pistons to night. The other thing I wanted to ask was has any one had to wield up the sump were the spring pack sits. It looks like it's being fix up at some time and may need doing again

I have just brought two D4 7U and one 6U suitable for wrecking so if you need second hand parts .
Stuss

I have just brought two D4 7U and one 6U suitable for wrecking so if you need second hand parts .
Stuss