Well I've been looking at this web site for a while now and I finally have singed up for an account. I own a 1989 f250 wtih a 6.9L 4x4. I was looking at puting a cummings motor in this truck with a divorced transfer case. But I have since changed my mind. Everyone has those dam cummings.

I built this truck from the gound up. I mean when I very first started I was a two wheel drive with a blown 7.3. So I did a frame swap and fixed up a old 6.9 to put in it. But now the dam truck has grown on me. So now I'm wanting to hot rod the old girl up and, there's very little in the aftermaket to do so. So like I said I was looking at putting in a cummings but, I thought that I wouldn't be true the the truck. I was wandering what could a person to to the internals of the motor to make her run better?

I was also looking at the ats turbos but they don't act ast if they could build enough boost for my taste. I was thinking that these motors had too much compression for say 15lb of boost or so? Oh and one more thing I hate my tranny (c6) the tourque converter slips badly. I was wanding if I were to swap to a zf5 or a zf6 out of a newer powerstroke how would I hook up my speedometer? Seeing how the newer stuff is electronic and all and mine is the old cable setup. Can a person swap in the older transfer? I'm not clear myself but, I think the splines are different.

 

If you planning on running boost, you could lower compression, and USE HEAD STUDS.

The ZF5 swap is pretty straight forward, lots have done it, and it is documented on a couple of sites. The ZF6 is much more involved, but has been done.

 

Well I been doing a lot of looking around today and I think I know what a need to do for the tranny. It appers that I need to find a zf5 out of a 87-1993 truck and go and buy the flywheel kit. Plus rob the peddals and the tranny hump. I've also looked at some of dave's posts but I'm still not clear how he lowerd his compression down on his motor to run the bigger boost numbers. I think that he milled donw his pistion or somthing. Does any one know what kind of turbo i could run to get that kind of boost? If dave See's this where did you get your pistions?

 

I bought mine through the machine shop that did the engine work for me.
Sealed Power Hypereutectic pistons, milled them down .040 off the crown.
Balanced the rotating assembly to over 4000 RPM.
ATS upgrade turbo, wastegate adjusted tight so it will never open.
ARP head studs.