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#1 |
Registered User
![]() Join Date: Apr 2017
Location: Boise, ID
Posts: 856
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1968 GMC w/ NP 435 - Gasket Set
I'm rebuilding a 350 and getting ready to drop it into my truck pretty soon. Before I do that, I'm going to (obviously) remove the existing 327 and transmission together. I figured since I have the transmission out I'd like to put a new gasket set onto it.
Does anyone here have experience with the NP435 and/or know a reliable source to get parts for it? I tried rockauto and found the gasket set in their ford section, but I'm not sure if the differences will create any issues. https://www.rockauto.com/en/moreinfo...493670&jsn=456 I'm still fairly new to this world, so is there anything else I should change while I've got the tranny out? It ran perfectly before the motor went out, so I'm not sure if a full rebuild is necessary. Thank you in advance!
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1968 GMC C2500 Long Bed Fleetside |
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#2 |
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Join Date: Nov 2014
Location: Lincoln City DE
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Re: 1968 GMC w/ NP 435 - Gasket Set
That's a New Process ,, I've heard NOVAC
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Stan 67 swb BLU MULE posted via flip-fone |
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#3 |
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Location: Boise, ID
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Re: 1968 GMC w/ NP 435 - Gasket Set
I know it sounds weird, but I did pretty extensive research and am 100% sure it's an NP435. Here's a picture of the casting number on it. I don't have any other photos on hand right now, but it has the very obvious NP435 shape and aluminum top plate.
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1968 GMC C2500 Long Bed Fleetside |
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#4 |
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Location: Boise, ID
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Re: 1968 GMC w/ NP 435 - Gasket Set
Correct, it's a New Process 435 4-speed transmission
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1968 GMC C2500 Long Bed Fleetside |
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#5 |
Registered User
Join Date: Nov 2014
Location: Lincoln City DE
Posts: 1,292
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Re: 1968 GMC w/ NP 435 - Gasket Set
Hey , chevy had em 68-73
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Stan 67 swb BLU MULE posted via flip-fone |
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#6 |
Registered User
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Location: Boise, ID
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Re: 1968 GMC w/ NP 435 - Gasket Set
Yeah I was surprised they'd have a Chrysler product. I was responding to someone who didn't believe I had an NP435 and wanted proof, but they deleted their post...
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1968 GMC C2500 Long Bed Fleetside |
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#7 |
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Join Date: Nov 2014
Location: Lincoln City DE
Posts: 1,292
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Re: 1968 GMC w/ NP 435 - Gasket Set
One way to check is with a magnet, which won’t stick to the aluminum top cover of the NP435. The NP435 also has the PTO cover plate on the passenger’s side.
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Stan 67 swb BLU MULE posted via flip-fone |
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#8 |
Registered User
![]() Join Date: Apr 2017
Location: Boise, ID
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Re: 1968 GMC w/ NP 435 - Gasket Set
I've checked both and they're true. It's definitely an NP435
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1968 GMC C2500 Long Bed Fleetside |
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#9 |
Senior Member
![]() Join Date: Aug 2005
Location: Los Angeles
Posts: 1,331
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Re: 1968 GMC w/ NP 435 - Gasket Set
Yes, in a lot of GM trucks during the 60's are early 70's, particularly GMC's. Novak is good, I think the last time I built one I used www.drivetrain.com. Be careful ordering parts, there are MANY different versions of these. A very stout transmission, and there are both wide and close ratio versions. New Process was owned by Chrysler for a number of years, but they were an independent division and sold transmissions to many manufacturers. 435's were used by GM, Dodge, Ford, and International. New Process was sold off and merged with Muncie to form New Venture, which in turn got bought by Magna.
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1967 GMC CM-2500 Camper Cruiser, 351E V-6, NP 435 4 speed, Dana 60, and factory A/C. 2012 GMC K-3500 WT regular cab, 6.0L Vortec, 6L90. |
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1968, c2500, gmc, np 435, np435 |
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