Is a ZF6 just so good no one does rebuilds??

[Freedombyforce]

I'm doing a 4R100 to ZF6 in my 02. I picked up all my parts but the ZF6 I got has 300k on it and I'm a little concerned about stuffing it in there without taking a peak inside. The problem is I swear I have searched to the end of the internet and I can't find anyone doing rebuilds themselves. Hell I can't even find a reputable dealer selling rebuild kits. Whats the deal?? Should I just stick it in there and hope for the best, or unbolt it and see whats inside? Anyone ever busted the case open on this beast??

[Vdryv]

Lots of ppl do rebuilds for them but are costly
They are stout and don't have too upgrade them for more power u put to them
Only have to upgrade clutch on them the more power u make

[ProOnThaSnow]

I've got 332K miles on mine. Put a Heavy Duty clutch in it about a year and 50K miles ago. Tow all the time with it - Can't say a bad word about it.

I guess if you wanted to you could bust it open and take a look around - see if any teeth are missing or are worn. If all looks fine I'd venture to say you are good to seal it back up and use it.

[dieselcrawler]

My red truck is an early '99, has about 195K on it, and aside from the syncros for 2nd gear letting it grind a little on a fast shift from 1-2, does fine... hard to get into Low, but I'm thinking it's just the nature of the beast.

I do know of a local guy who bought a used 350 dually, and had to replace his trans, lost 3rd and 4th I think, but it was used hard before he got it, was a constrution company truck, lots of drivers, little maintnance. And he also uses it hard, and has his employees driving it...

[Freedombyforce]

Well my curiosity got hold of me and last night and a transmission friend of mine and I busted it open. There was no metal in the bottom and the inside was completely clean. All the teeth looked like they had no wear and the syncros seemed good. I will say I was a bit surprised. I'm going to pick up an input and output seal and bolt her up. I'll report back once I get "one piece at a time" rolling.

btw... I don't think I mentioned this was a work truck, Pool maintenance to be exact.

[7.3PwrHse]

ZF 6 Speed Gear | REBUILT MANUAL TRANSMISSION

There's one site I found a while back. Don't know how well their customer service is or quality - haven't had the need to find out just yet. Figured I'd throw it out there for you anyhow

[Viper9087]

Originally Posted by dieselcrawler

My red truck is an early '99, has about 195K on it, and aside from the syncros for 2nd gear letting it grind a little on a fast shift from 1-2, does fine... hard to get into Low, but I'm thinking it's just the nature of the beast.

I do know of a local guy who bought a used 350 dually, and had to replace his trans, lost 3rd and 4th I think, but it was used hard before he got it, was a constrution company truck, lots of drivers, little maintnance. And he also uses it hard, and has his employees driving it...

Hard shifting into Reverse and Low is caused by the plastic bushing on the end of the clutch master cylinder, where it meets the shaft on the pedal.

the plastic bushing ALWAYS breaks and essentially there is so much slack it is as if you are trying to shift with the pedal half pressed in. the little bushing gives way to about 2-3" of pedal travel when it is broken. not allowing the clutch to fully disengage. also causes PTO grinding.

Ford sells this for $15 roughly but it will just break again in a few months.

there is a perma fix for this on e-bay. best $25 i ever spent. easy to install. hardest part is pulling the lock rings off the shaft that holds the pedal in place.

Here is a description of it: http://youtu.be/6C75oQNNows

[rascal]

I am going to have midwest transmissions rebuild mine (oil pump out) and have the cryo treat the shafts and syncros when I am ready.