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Old 03-19-2009, 05:36 PM   #26 (permalink)
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My 323 (318 bored 30 over) has been great, just beed a better tBI/Carb. The crappy Holley 502S is hit or miss.

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Old 02-12-2020, 06:55 PM   #27 (permalink)
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Been following these posts with some interest.
I have a '75 Chev with the 350SB over here in OZ, have an NP4350 (some call it the NP445) close ratio all synchro box out of a Dodge which I kicked around the idea of replacing the Std SM465 granny gear with. It is only a weekend warrior to tool around with, so higher starting first gear won't worry me.
Both have the clutch throwout arm in the same position, just eyeballing it I would think the easiest solution would be to simply add a machined alloy (or steel) spacer block between the original Chevvy bellhousing and the front face of the tranny. NO? I do have the original Dodge B/H but too much ginning around. Easy enough to have a pilot tip extender machined up out of brass stock to suit the Chev flywheel, and have had in the past had clutch discs made up with differing centres (Chev 10 spline--Dodge23 spline, had one made up recently to go from 23 spline Dodge to Perkins 203, but thats another story).
Some alteration to the tailshaft probably needed, but thats straightforward.
Been kicking this around for a while, no gain in final road gearing, both 4th direct 1:1, but the tranny in remarkably good condition, had it sent over from your way for another project. All I had to do was chuck in input/output bearings and seals, fresh oil, came up like a newbie! Would be interested in what you guys think, Dave
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Old 02-13-2020, 10:00 AM   #28 (permalink)
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I think you'd be better off finding a Ford close ratio t-19 than using the np445. The 445 isn't very common, even in the states, and Ford made t-19s by the truckload. I'm pretty sure all of the adapter companies make stuff to mate these to chevy engines because it's easier to do than use anything from Dodge. Dodge stuff is kind of it's own brand of different.
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Old 02-13-2020, 11:24 AM   #29 (permalink)
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If you break it, it's done. There are no hard parts available for the NP445. It's really not worth all the trouble to swap in a 4 speed. You would be better off spending that time and money on a modern 5 or 6 speed with overdrive.
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Old 02-13-2020, 11:44 AM   #30 (permalink)
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To add to what he ^ said, if you just want a close ratio box with less hassle, use a modern 5 speed such as a 3550 or 3500 (which ever one chevy used) and it will bolt right up. If you break it, there's a replacement waiting to be plucked from the yard of some guy with a mullet. If you don't need the o/d due to your current gearing, simply don't use 5th gear. If you do find you need it, BONUS! No sense in running the Dodge spec box just because you have it.
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Last edited by crashnzuk; 02-13-2020 at 11:45 AM.
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Old Yesterday, 02:21 PM   #31 (permalink)
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Thanks for your input, Guys.
Probably not worth the ginning around as you say. Had the 445 box sitting here doing nothing, but just may unload it to some Dodge bloke, they are often looking for a replacement over here for the 435's.
Dave.
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