I found an old home-made 7x9' and reworked it to mount on my dodge. (Headache rack needs work still. ) My buddy built his to the width of the cab, and 8.5' long.
Both of us mounted as low as possible, and used the factory bed bolt locations into the frame.
Yes, that's my feeling on them. A buddy of mine drove truck at a cheese wholesaler years ago where they ran a few ford CF cabovers with those engines. Also my local marina has a f700 with one. They seem to take the miles.
I would get a solid pinion spacer in advance. No guesswork on tightening the nut. That lets you fully torque it to spec without further sleeve crushing.
Pre-loading used bearings isn't what you want to do.
I regard them as durable as the cummins 6BT/6CT.
IMHO, some of the support and parts market has fallen off because ford dropped them around 93... nearly 30 years ago now. Find the same ford MDT you're describing in 94+ and its a cummins in most cases.
Low-end boost is difficult to tune for with the stanadyne pump. It's not a Bosch with an AFC device.
You basically have to size the turbo for the top rpm/fuel-rate and get-what-you-get on the lower end. A wastegated turbo does help some, but what you gain in responsiveness is a burden at high...
I think you mean the Cummins 3.9L 4BT. There were a number of parcel/delivery type vans based on Ford and GM chassis that featured this engine in the early 90's. The Chevy version is more common, but I have read there were some Ford ones - with a ZF5 even.
Lots of different swaps discussed...
I did for a bit, and didnt like what i found for residues in the fuel bowl and fuel pump later. Probably worse in the tank. One big issue (in hindsight) was I blindly took other people's wmo; not strictly my own controlled collections.
If i was going to try again, it would be with a...
The van disc brakes can be swapped onto your old diff if you do the work...
http://www.fordmann.com/F350.rear_disc_brakes.htm
One hub swap i've read that works is with the dually diffs. The pickup Dana 80 (99-04) and the van Dana 70 (99+) can swap hubs to change wheel patterns.
My trac-lok discs had the groovy pattern in them. Unit was tight and agressive with the truck empty. With a load of gravel or topsoil, it would get stuck on wet grass (one tire spinning) until i grabbed 4wd.
It was close-quarters with a long truck, in a pretty little yard so i really didnt...
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