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Old January 5th, 2012, 10:48 AM   #1
85toy4runner
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finally ready to start m715 build i think

been gathering parts forever it seems lol ... i think im finally ready to start the build on my kaiser m715...my funds are tight so everything ive gathered for this has been lots of leg work to find deals, but ive been lucky... could use any advice as im still needing to figure alot out... got the m715 a while back, traded it for a pretty nice 4cyl tj. however the guy i got it from searched for 2 years and had this brought back from the western part of the country... on the WHOLE TRUCK i have found one rust spot the size of a quarter that is on what appears to be a heat shield underneath... truck has under 20k orig and is almost as if it was preserved.. motor siezed but i doubt you could find a cleaner, more complete original and unrestored m715... ive been back and forth on what engine to use but i think im sticking with my latest find. found an isuzu 4bd1t diesel at the local pull a part complete with under 150k and was able to score the complete engine for $800...anyone with any experience or opinions on this engine, im open to hear em... also i need to figure out exactly how im going to mate it to the new trans ( also at the pull a part, on the same day found an nv4500 in a chevy dually, pulled and was out the door with it complete with new clutch $75 :) ).... any one that knows how i can mate the nv4500 to the 4bd1t, i would greatly appreciate it as it is really the biggest issue at this point. im thinking ill use the stock divorce np200 case, as ive read these are pretty bulletproof... onto the axles.. im really open to suggestions here, so here are my options, 1) run the stock 60 front and 70 rear, however these are not as tough as the later 60 and 70s.. do already have 5.87 gearing however 2) was able to score a matching front and rear set of 2 1/2 rockwells complete for the cost of 4 ball joints and my own labor, on the guys super duty.. i would love to use these but i dont want this to be offroad only, and im not sure if thats possible with these, at least cost wise (gearing, brakes other than pinion...). so any insight on this would help alot.. 3) last but not least, as this may very well be the route i take with this.. found a 78 f250 at the pull a part, and scored the hp d60 front for $75 ( the guy charged me for a rear axle lol).. thinking this is much better than the m715 d60 in alot of ways (brakes, shaft and ujoint strength, 8 lug, etc..) and ive also read on the m715 zone that the springover pads are identical width to the m715 spring width.. i will however have to find a ford divorce 205 to use it... for the rear ive got a matching ford d60, but im thinking id like to find something else, maybe a 14 bolt or 8 lug d70... the gearing in these are 4.10, i cant really decide with the diesel if that is good or if ill need more, any input on this, again, is appreciated.. tires will be either 44inch monster mudders ive been waiting to use or 46 inch military rubber i got my eye on... really just excited to get this started and hoping some of you here can help fill in the gray areas and share any opinions or advice... im starting to get nervous about how the hell im going to get this nv4500 on the back of this 4bd1t
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Old January 5th, 2012, 11:12 AM   #2
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Sounds like its going to be pretty damn cool. I love M715's, but I got halfway through and lost my place. Paragraphs please.
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Old January 5th, 2012, 11:30 AM   #3
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Quote:
Originally Posted by mschaffer66 View Post
Sounds like its going to be pretty damn cool. I love M715's, but I got halfway through and lost my place. Paragraphs please.
^^ This.

Pretty much after reading you got it in trade for your 4-cyl TJ, it kinda all ran together on me. Could be the A.D.D.

Cool build though. Awaiting on pics.
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Old January 5th, 2012, 12:13 PM   #4
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$75 for a dana 60 huh?

you asked for opinions, mine is leave it stock. rebuild the seized motor, or just un-seize it
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Old January 5th, 2012, 01:52 PM   #5
85toy4runner
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yeah, most pull a part jy around here have set prices so i got the ford d60 front for $75 because he charged me for a rear axle. not much interest in leaving stock, i want more than a stock m715 can deliver, and i need to start using these parts ive got laying around
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Old January 5th, 2012, 01:53 PM   #6
85toy4runner
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oh and yeah sorry, i suppose i did kinda lump it all together lol.. my brain was working much faster than my fingers could type... hopefully i can get myself a digital camera soon and post pics. ive got the body off the frame, and ready to get started with fab and assembly
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Old January 6th, 2012, 08:27 AM   #7
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This thread is worthless without pics!
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Old January 6th, 2012, 11:32 AM   #8
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I struggled through it....mostly because M-715's make my pants fit tight...

Run a more modern Dana 60 and 14-bolt, ditch the NP200 for a NP205...and post some pics.

The Ford 60 is a good unit, but it seems a little off in an M-715, you could easily sell it and pick up a Chevy 60, then a Dodge divorced NP205 (some M-715's were swapped over to the Dodge 205 by the military...pretty sure you can get OEM mounts for one)

The diesel setup is cool, but the nice thing about running the divorced case is that you can put just about anything up there, why not find a motor and trans combo that's already mated up?
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Old January 6th, 2012, 11:49 AM   #9
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Quote:
Originally Posted by 4Bangler View Post
I struggled through it....mostly because M-715's make my pants fit tight...

Run a more modern Dana 60 and 14-bolt, ditch the NP200 for a NP205...and post some pics.

The Ford 60 is a good unit, but it seems a little off in an M-715, you could easily sell it and pick up a Chevy 60, then a Dodge divorced NP205 (some M-715's were swapped over to the Dodge 205 by the military...pretty sure you can get OEM mounts for one)

The diesel setup is cool, but the nice thing about running the divorced case is that you can put just about anything up there, why not find a motor and trans combo that's already mated up?
Yeah what he said.

I'll come take that 60 off your hands for ya
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Old January 6th, 2012, 12:03 PM   #10
85toy4runner
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i know. my thread sux because i dont hav a dig. camera yet lol... im gonna try and get one this weekend to post pics. also whats the benefit of swapping a 205 for the np200. from my understanding there both gear to gear and pretty tough. is there a weak link in the np200? also, i really like the idea of a diesel in this. at the same time i understand what your saying. i have a 1970 cad 500ci we just rebuilt and a th400/205 combo i was thinking of using. also considered the old 68 396ci thats been on the engine stand waiting for a good home. problem is that i would like to put this thing together the way i want it the first time, instead of going back later to put the diesel in. anyone have any ideas as to how to mate the isuzu 4bd to the nv4500?? ive seen these two paired together alot, i know its been done, just seems like i cant find how it was done
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Old January 6th, 2012, 12:05 PM   #11
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does anyone see a problem with running my 2 1/2 ton rockwells under this... seems to be the census says 60 / 14 bolt
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Old January 6th, 2012, 12:51 PM   #12
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Build thread without pics is like cyber sex, It might get the job done, but when I see it in real life I'm going to be pissed that it's actually some guy.
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Old January 6th, 2012, 07:05 PM   #13
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I have a 68 715 that I put together several years ago, basic 350/th400 with divorced 200. I have beat it like a red headed step child, and never broke the original axles. I run the 38x11 boggers on split wheels with tubes, still 6 on 7.25 pattern. Don't underestimate the strength of what is already in there, although the brakes are terrible. I copied a disc brake setup that its available for the stock axles, but looking back I wouldn't do it again.

I would ditch the 200 if you have any plans of road driving it. The tcase makes a ridiculous amount of noise. Best choice isto find a drive train package that was meant to go together to begin with. Sell off all your finds, and pick up a 6.5 or 6.2 diesel if you want to stick with an oil burner, or any number of gasser motors are easy swaps. The engine bay easily accepts big block power if you want to go all out. A 6bt is the ultimate swap, but takes a bit more work.

I can recommend removing some leaves from the suspension, or investing in a good kidney belt, it is a rough ride.
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Old January 6th, 2012, 08:58 PM   #14
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cool to see some other m715's getting built. i am slowly working on one in between other things. dana60 and 14bolt with 40inch mtrs and a cummins. here is an older pic of the motor going in. it has an intercooler on it now and is almost done.
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Old January 7th, 2012, 11:36 AM   #15
85toy4runner
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jeepm715, funny you should mention that about the 6.2... i recently picked up a 6.2 goodwrench motor with less than 20k on it and a matching goodwrench th400 for $400 from a freind. i havent really done anything with it (i actually have it for sale in the parts section here) . shortly after i found a reman 6.5 turbo at the pull a part and grabbed the whole setup. i was pretty interested in putting the 6.5 turbo setup on the 6.2, but ive got mixed opinions on the 6.2 engine. i used to own an 87 suburban with the 6.2, and while i loved the fuel mileage, power was less than impressive. could of been the 3.07 gearing, 38 inch tires, and the shear weight of the suburban lol. do you think the 6.5 turbo setup on my 6.2 will perform well in my m715 on 44 to 46s with 5.87 or lower gearing? also im very interested to hear that you havent had problems with the stock axles. i am also interested in running the stock d60/d70, maybe just see how it goes and replace them with the rockwells if i have problems. this would work out well as i had custom 16.5 steel monster wheels made to the m715 six lug ( had custom 6 lug centers made, then welded into 16.5 wheels) . then i can remount the 44 inch mudders and good to go...

Last edited by 85toy4runner; January 7th, 2012 at 11:46 AM.
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Old January 7th, 2012, 11:40 AM   #16
85toy4runner
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fabricator, very nice m715. its really cool to see other peoples m715 builds. is that a 4 or 6 cyl cummins? also noticed your springover, what springs are you using up front?
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