engine swap advice

[brute4c]

You can download this spreadsheet and put in any numbers you want and it will tell you the rpms at certain speeds...
http://www.m715zone.com/jonmisc/RPM_Calc.xls

Running a true 40 inch tire with 4.56 gears and a 700r4 trans with a top gear of .7:1:

55 mph=1475
60mph=1609
70mph=1877

A bit low I think...

FYI: A 1:1 top gear and the 40 inch tires and 4.56 gears yields 2299 rpm at 60 mph...

[crisp]

WOW, now that what im talking about. thankyou thankyou thankyou

[N2S3]

The cell I11 in the spreadsheet seems to be wrong, but no consequences. Must be 5 (mph).

Nice sheet for planning!

[brute4c]

Found the error, fixed it, uploaded the new sheet...so delete what you have and download it again and you should be good to go.

Thanks for pointing that out so it could be corrected!

[crisp]

very useful, thanks again

[militarytrux]

We're working on a 4bt with the ZF 5-speed set-up to swap in this summer, we did the 6.2 diesel swap and that worked out well, those motors are cheap and if they run good their not a bad choice. I like the 6.2 alot better over the 350 I had in there before the swap.

[JIBBFM]

Well when I got my M715 over 10 years ago the city modifed a Ford 351 windsor motor that ran terrible and constantly over-heated. I had an old vortec v-6 that i just finished rebuilding and thought i would try that out as i dont plan to do too much more off-roading and will see if it can push it down the highway. I'll let you know how it turns out in a month or so.

[moosejr]

I am putting together my M715 with the drivetrain from a 90 dodge, 1st gen diesel. This engine was de-tuned for the pickup, but it is easy and inexpensive to get way more than adequate power out of. I changed the exhaust manifold and turbo, which nearly eliminated the turbo lag, bumped up the injector pump. It has way more power than I will probably ever even WANT to use. And with the gearing and 40" tires, fuel economy should be around 20. . .The thing with the early dodges is that the engine is far superior to the body, so finding one with a good engine and a destroyed body, should not be really hard. I would plan on some wide tires for running beaches with that heavy of a motor, though, ..you will need a lot of flotation, .this is one place where the lighter v-8 diesels (or even SBC) might be a better choice. I don't run my truck on the beaches, . .that is what the CJ is for. . .Of course CA beaches are a lot different than east coast beaches