ZF6 limitations

[rascal]

Anyone had any experience with exactly how much power one can put to a ZF6 before failure?

I am planning some upgrades for the first of next year and would like to know what my limits are. I want to up the power without blowing anything up because I need the truck to be reliable; an MPG boost would be nice too!

I am going to upgrade to a Valair clutch before I do anything.

Thanks!

[Galaxie]

Im sure there are some people who have added power until gerenade but here is some info.

ZF 6 Speed ZF S6-650 Specs

[rascal]

Thanks Galaxie!

I have read some posts in other forums where people say they know someone running 500hp/1000lb ft w/upgraded clutch and the transmission holding up all day even though they are only rated for 520lb ft; conservatively.

I would be happy with 400/800. I know Valair clutches for the ZF6 get up there in ratings. Their high end single disc clutch for Ford 99-03 ZF6 is rated for 500/1000.

I will talk to multiple performance (Rosewood,Beans,Swamps) companies to see what they recommend.

I was just curious as to what people here have done when bumping up the power in their trucks with a ZF6.

Thanks!

[Galaxie]

No problem. Power combined with traction is what stresses stuff out!

[hollister25073]

There's some sled pulling 6.4's that have 600 horse that leave the line bouncing the rev limiter with a strong dual disk

[Galaxie]

TQ is what to look at. But yea, 600 hp im sure its around 1000FT