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Old 10-27-2020, 02:05 AM   #1
kauaiman
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np435 transmission rebuild

I have a 1969 c-10 with a np435 4speed transmission. I have been scouring the internet ,but cannot find a good tutorial or write up on rebuilding one. I am getting a grinding noise when shifting into fourth gear. all other gears work fine.
Anybody have a good set of rebuilding instructions I could use? I have rebuilt other manual transmissions, but would like detailed instructions so I only have to do it once. Thanks
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Old 10-27-2020, 12:54 PM   #2
Wrenchbender Ret
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Re: np435 transmission rebuild

They are easy to work on. The early ones had a weird syncronizer setup. They broke real easily. I imagine a replacement will be hard to find.
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Old 10-27-2020, 01:41 PM   #3
Orange Crate
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Re: np435 transmission rebuild

Quote:
Originally Posted by kauaiman View Post
I have a 1969 c-10 with a np435 4speed transmission. I have been scouring the internet ,but cannot find a good tutorial or write up on rebuilding one. I am getting a grinding noise when shifting into fourth gear. all other gears work fine.
Anybody have a good set of rebuilding instructions I could use? I have rebuilt other manual transmissions, but would like detailed instructions so I only have to do it once. Thanks

What is wrong with the factory overhaul manual?
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Old 10-27-2020, 05:39 PM   #4
WorkinLonghorn
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Re: np435 transmission rebuild

X-2 on the factory manual. These guys supposedly have instructions too;

https://www.novak-adapt.com/knowledg.../manual/np435/

https://www.novak-adapt.com/catalog/...s/np435-parts/
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'69 GMC C2500 Custom Camper, 8 1/2' bed, New GM 350, NP 435 Close Ratio 4spd. Trans., 3.73 Dana-60 open.Camper and Trailer wiring, PS, PB, AC, tach , three gas tanks, 2nd owner, Work-Truck supreme. Best $300 I ever spent.
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Old 10-27-2020, 06:32 PM   #5
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Re: np435 transmission rebuild

Here is the linky I couldn't find earlier for the overhaul manual for 1969.


http://67-72chevytrucks.com/vboard/s...d.php?t=558016
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Old 10-27-2020, 07:47 PM   #6
TwoFiftyShifter
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Re: np435 transmission rebuild

What is the deal with these 435s? They appear to be like an SM465 but with closer ratios. Better ratios than the 465 for most of us. But only came in a few of our trucks, mostly came in Fords?
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Old 10-30-2020, 01:33 AM   #7
WorkinLonghorn
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Re: np435 transmission rebuild

All of the Fords had the wide ratio model. The one that GM used in the light trucks was the 4.56 low gear model. Short throw, smooth shifting close ratio (well, a lot closer than a 465 anyway) transmission that is as stout as a 465. I like mine much better than the 465s I've had but if I was pulling a large trailer near the max gross combined weight limit, I'd like a 465 (or a TH-400). My truck was ordered as a camper hauler and I heard somewhere that these NP435 were considered better for this type of usage.
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'69 GMC C2500 Custom Camper, 8 1/2' bed, New GM 350, NP 435 Close Ratio 4spd. Trans., 3.73 Dana-60 open.Camper and Trailer wiring, PS, PB, AC, tach , three gas tanks, 2nd owner, Work-Truck supreme. Best $300 I ever spent.
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