NP420 & /6 with auto

[blakita]

I have a '66 slant 6 with automatic out of a D-100. Runs and is in frame rails. Also have a 4spd. from a 64 W-300 which i belive to be an NP420. Free to clean up the yard. In central MD.

[DDEMILLE]

I may be interested in the NP420, if I can couple it to a 360. I'll be driving thru Maryland in March, if you can wait.
Doug

[blakita]

Let me know when you'll be headed this way in March. It's not going anywhere. Do you need an hydraulic bell housing to go with it?

Paul

[DDEMILLE]

Sorry, Paul, I must be getting old or something. I already have too many NP420s. At least 3, including the one in my running M37. What I'm looking for is a later 4 speed, with full synchros. There's something about the word FREE, that causes some of us to lose our sense.
thanks again, Doug

[blakita]

I've come to realize there is only so much room for spares, and for as long as the drivelines last in these trucks, even with moderate abuse, I don't need to hold on to 3 or 4 everything. I spare of each should be enough.

See you down the road.

[paul]

hi, just wandering if you still had the transmission around; i'm looking for a grannylow 4speed for my 77 1ton and yours might work. actually i'd like to mate it to a 360 LA engine if possible, i don't know for sure if it would mate up, but it might. let me know, thanks.

[blakita]

I don't want to discourage you but, the NP 420 is not a synchronized transmission. It does have a granny low and will bolt up to the same bellhousing as the newer NP 435. It is still available. e-mail me at pmblakita@haywardbaker.com.

[Charles Talbert]

The NP420 has a synchronized 3rd & 4th gear, but nothing more.

[paul]

thanks for replying.i know the granny low is nonsynchro, but if the other gears are , it might shift okay- i use the truck for towing sometimes and it needs a stout manual trans. i have an aluminum 435 bellhousing; you said it will bolt up okay; i assume the bearing retainer is the same diameter? is the input shaft length and tip diameter same as a later 435/833? if so, it should fit a later motor like a 360/318. I have several motors i could put in front of it(318/360/383/400/440) but i would really love to put a 360 in the truck; however some of them have crankshafts drilled for(or already have installed) the manual bushing, some don't. And, my 435 bellhousing is only for smallblocks. my 360 is drilled, but needs the busshing.also, you have to be careful about the flywheel(internal vs. external balance). do you think this might be doable? also, is the trans usable now, or would it need to be rebuilt? also, what motor was in the vehicle originally? thanks for your time-paul

[Drew M.]

There are universal Mopar crank pilot bushings used with both the auto and manual crank version of the SBC.

53009180 – new #: 9188B $13.74 (needle bearing version)
4338876 - $6.90 (bronze inner bushing version)
- Dodge dealer prices from when I checked during the Spring 2005


I also heard that you can use a 29/32" drill bit to enlarge the hole in the crank to the proper size to fit the bushing. I would just get the bushing from a Mopar car/truck dealership.

So, no excuse to not use the 360 with a manual trans - other than balancing the flywheel.
Check out this webpage for how to do it: http://www.motorsport.wlrgroupco.com/ramcharger_page_2.htm



I just saw another source for the bushing: "NAPA sells
a bushing designed to fit auto crank's unreamed hole, part number 615-1033. "

[Alxj64]

Is this 420 still around as I am not too too far from MD