I would call David Kee or drop Mark another note, he has made plenty of time to talk to many of us over the years!

 

http://www.network54.com/Forum/260730/

 

I've been doing some looking my self and if you match all interior parts it should work fine , Input and output shafts and gears are also matched to shaft size . It may get expensive and may be cheaper to find one done and set up allready .

 

Thanks for the link to the Ford Tranny forum. I've put the question out there...Let's see what they say.

Actually, I'd posted on that forum before with questions about this upgrade and got only one inane response. I hope to do better this time.

We'll see.

 

IIRC, all you need to do is swap in a 28 spline output shaft. The rest of the internals are the same. You may also need to change or modify the tailhousing. I don't know if there is a difference in diameter of the 25 vs 28 spline yoke.

 

Is the case the 5 bolt narrow face case, or the wider 6 bolt case? Virtually all the 25 spline toploaders I have seen have been 5 bolt cases. To replace input/outputs, plus all the other work to be done, I would question the economics of the job. Is your block a 5 or 6 bolt case. If it is a 6 bolt block, then the 5 bolt toploader will not fit anyway.

 

Bob -- This is the case with bolt patterns for either 5 or 6 bolt setups. The engine I'm building is based on a 6-bolt, 67 289.

It is a rather strange gearbox, used only for 6 months, from the beginning of the 65 model year in August through January of 65. It also has the dual-purpose tail housing with bosses cast to mount either a Mustang or Falcon shifter. I bought it from another VMFer a few years ago and put it back in the corner of my garage. The 331 is in progress, so I thought I'd better look it over and get the parts I need to build it. That's when I found out that it is an HEH-P 25-spline box.