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Old 09-25-2002, 04:36 PM   #1 (permalink)
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Can you indentify this tranny

I blew up my sm465 and picked up another tranny out of a 74 dually 2wd. The numbers dont match, so does anyone know what a 6273212 is? We already know that it has a granny gear. can it be converted to 4wd, is it worth installing?

Any help will be appreciated

Thanks

Jon

Ps I called the dealer, and they said that its not in the system anymore. So no luck there.
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Old 09-25-2002, 04:52 PM   #2 (permalink)
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I'm not sure what the number is, but it might be an sm-420, that's what chevy was using prior to the 465.

-Scott
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Old 09-25-2002, 04:57 PM   #3 (permalink)
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I just called a tranny shop and they said its a T19. the bearing diameter is smaller than a 465. He also said it depends on alot of things to determine if it will fit the transfercase.

Its a 1980 3/4 ton Suburban. I dont know what teh transfercase is. I just bought the truck.

Think its worth the time? Or just get another 465, or rebuild it??
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Old 09-25-2002, 05:13 PM   #4 (permalink)
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I think you are going to have a hard time getting this tranny (whatever it may be) up to strength standards of a 465. I don't knwo a whoel lot about manuals but I do know that I have seen lots of 465's in trucks that are rated in excess of 1ton.

-Scott
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Old 09-26-2002, 05:37 AM   #5 (permalink)
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T-19 in a dually? I doubt it. Exactly what bearing diameter are you refering to that is smaller than the SM465? GM used the SM 465 in almost all manual trans trucks, 2wd or 4wd, from '68 to '87 and maybe a few even later than that. A T-19 would be dwarfed by the size of your SM 465. Your transfer case (if original) is an NP205, unless someone robbed it and through in a later (and weaker) NP208, the 205 is cast, the 208 is aluminum.

SM420's were used in GM trucks from '47 to '67 are slightly smaller in size than the SM420, with only one PTO port on the driver's side (the SM465 has them on both sides) and a large "hump" on the passenger side.

A replacement SM465 shouod be very easy to find, it's hard to take ten steps in any direction without tripping over one, and it's hard to believe that you've actually blown one up, they are nearly indestructable.
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Old 09-26-2002, 06:21 AM   #6 (permalink)
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Its a BIG tranny, Looks almost identical to the 465(still in the burban). Since I need to tear out the 465, I might as well just throw em side by side. I think I will run the tranny if the t/case bolts up. As long as the spline count is the same I shouldnt have any problems. I hope

Thanks for the advice. Ill post up what I find out.

Jon
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Old 09-26-2002, 08:40 AM   #7 (permalink)
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The 2wd SM465 will most likely need the mainshaft from the 4wd SM465 in order to work with your t-case, not a big job, those transmissions are super easy and super tough, again, are you sure your trans is junk?
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Old 09-26-2002, 08:59 AM   #8 (permalink)
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whats the length of the trannie in question? Do you have any pics?
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Old 09-26-2002, 07:41 PM   #9 (permalink)
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465s have an extrnal web cast into the case, SM420s are smooth, and reverse is in the left top on the 420, on the lower right on the 465.
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Old 09-27-2002, 06:14 PM   #10 (permalink)
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All this good sm-420 info...

Does anyone here have one of those cast iron 420 cases laying around? I really need one.

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