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Transmissions and Rear Ends Three on the tree or four in the floor? Shift it all here. |
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#1
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What transmission is this?
I have my 1966 GMC 910 (Canadian) 1/2 ton pickup at a transmission shop for having the transmission rebuild. They told me it was a rare and unusual transmission in it?? It is a 4 speed manual on the floor. They said they were having a lot of problems finding internal parts for it. They told me the trans was a MNNP420 transmission. I have never heard of this and can’t find any info online either. Anyone know what this is???
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#2
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Re: What transmission is this?
Try looking at SM420 and see if the trans matches yours. I'm pretty sure they don't know butt from elbow at that transmission shop. You can rebuild them pretty easily on your own if they bugger it up. Sm420 was a very popular trans.
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#3
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Re: What transmission is this?
Novak has the kits for it and I always thought they were fairly common
https://www.novak-adapt.com/catalog/...s/sm420-parts/
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1961 GMC Suburban 305A Overdrive 1962 GMC Utility 305D |
#4
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Re: What transmission is this?
Quote:
Good luck with your rebuild!
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Ed Snyder Medford, Oregon 1962 1000 Pickup 401M & Muncie 318 with overdrive 1962 K1000 Suburban 401M & SM420 1967 CM1500 pickup 351E & NP435 |
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