The Stovebolt Site Forums The Shop Area Driveline NP435 transmissions

Hi All,

Hope I am in the correct forum and not jumping into anyone else's post.

My query is directed to specifically NP435 Transmissions, I have been led to believe that Chevy/GMC only used these particular tranny's between the years of 1968-1972. Were they restricted to the inline six (what size?), or also used behind the SBC engine? I also believe they came in two different ratios for GM/Chevy.
Being over in Australia, these seem to be thin on the ground, plenty of auto's or the GM SM 420/465 available (with a bit of searching), but not too many of the NP.'s.

I was hoping to lay hold of one of the "close ratio)NP 435 (A) or even better, the NP435 (D) for a build up project. Trouble is I am not very well up on Chevy, but have always admired the C10/C20's and now that I have retired, wouldn't mind something to have a tinker with.

Hoping someone can throw a bit of light my way.

Cheers, Dave 64

Dave,

The 435 has a "Granny" first gear. If you want close ratios the one to use is the 445. Its ratios are 4.56, 2.20, 1.31 and 1:1. I have one in my '71 Dodge van and it's perfect for towing a small travel trailer.

Ray [email protected]

Thanks Ray,

May actually be onto one , supposed to look at 318 Dodge NP last weekend, bloke was working.
Cheers, Dave.

Chevy's in the states used sm420 from 1947 till 68 and 1969 introduced the sm465 till 1987? Thought the 435 was a ford/ dodge thing

the NP435 was in some GM trucks 68-72

Bill

Just going on personal experience, Having owned and parted over 35 67-72 chevy/gmc trucks, every 4 spd was a 465 or 420.

It is true that most will be 465 or 420's, but one of the 1969 Chevrolet one tons at a construction company I worked for had the NP trans, so they are out there.

Hi, been trying to find a bit of info on the NP445 as suggested, reckon that is about the ratio I needed. Mate of mine has a Dodge 4 tonner sqirrelled away in his yard, been underneath it to get some numbers, don't match up with anything I have. When I get back home will probably have to jerk it out to get a decent look.

Seems to be a little conjecture about GM Chevy using a version of the NP435's. Novak list them, but appears that if they were used at all, it was very sparingly in Chevy, as from what I am reading here, most were fitted with SM420 or the later SM465's.

Very hard to source a GM Chevy NP435 over here in Australia, been posting messages on different forums for some time, so far unsuccessfully.

Cheers, Dave 64

GMC used a lot of the NP 435 transmissions.

I've got one stashed away up in the barn- - - -no idea what vehicle it came from, but it's got the GM bellhousing bolt pattern and input shaft.
Jerry

Thanks Guys,
Looks like they are still around, but so far no luck over here in my country. Will keep asking around, may turn one up eventually. Thanks. dave 64

Pulled a NP435 out of my old 1967 3/4 ton. It had some very bad synchros in it. The parts were easy to replace but costly. If I had a less informed parts guy I would have had the wrong parts in hand. I would think the internals would be available from a Ford parts supplier. The case with the GM bolt pattern, would be the only difference. Truck type 4 speed with a very low 1st gear.

The early ones had a weird syncro setup. They didn't last very long.

I tore apart a 68 GMC 6000 today. It had a 292 and np435d.

So, anyone remember anything about these NP435D's ??
I had been told they used the close ratio all synchro boxes in SOME 1968-1972 camper vans and some school buses as well.
Trying to find out if a 22 tooth input shaft and input shaft housing still obtainable.
Thanks, Dave 64

Think that should have read NP435A
Daven 64

Got that wrong as well!
Should read NP435GA
Dave 64