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| | | | Joined: May 2007 Posts: 292 Wrench Fetcher | | Wrench Fetcher Joined: May 2007 Posts: 292 | The 478CID V-6 GMC < if one wanted to put one of these in a regular pick up sized dually truck.
1. could it be bolt up to the SM-420 trans ?
2. if not is there a M/T trans about that size one could get ?
I'm not trying to stuff a 2 million ton 9spd from a KW in pickup truck. . . NV-4500 or T-56 or somthing ?
Mike
1962 GMC K3000, GMC-379 V6.
| | | | | Joined: May 2005 Posts: 8,878 . | | . Joined: May 2005 Posts: 8,878 | NV4500 is probably a good choice.
Did the 478 only have an SAE housing (round) like the V12, or did it have a more traditional automotive housing (not round)?
The SAE housing gives more options for transmissions larger than the SM420. | | | | | Joined: May 2007 Posts: 292 Wrench Fetcher | | Wrench Fetcher Joined: May 2007 Posts: 292 | I think so I haven't seen oneup close and personal I was just looking at it on the 6066GMC site. . .
I don't want to put a HUGE tran's in that truck. . .
I would like a 4-6spd manual trans, if they can put a 5.9L 24 valve in a monte they gotta have small enough manual trans to put a 478M in my GMC !
I saw on the site where a guy put the 478 with an alliosn auto in pickup truck a 3/4ton I think I would be interested in doing that but not with an auto trans. . .
Any idea on the gear ratios of the NV-4500 ? I would like to gain an OD while still retaining my Granny. . .
any idea on a 6spd tran's for this ? granny first and OD 6th gear ?
Mike
1962 GMC K3000, GMC-379 V6.
| | | | | Joined: May 2007 Posts: 292 Wrench Fetcher | | Wrench Fetcher Joined: May 2007 Posts: 292 | i have looked up every photo I can grigg and best I can tell it's perfect round mounting plate so dose this mean that about Any Heavy duty trans would fit it ? so i wanted the 5spd spicer ? or an 18spd fuller ? either trans would bolt right up ?
the 379M-V6's i have seen went both way's is it possable the the backing plate comes off ?
wouldn't the Mack or spicer 5spd or 7spd be way too heavy for the light duty chassie ?
Mike D
1962 GMC K3000, GMC-379 V6.
| | | | | Joined: May 2005 Posts: 8,878 . | | . Joined: May 2005 Posts: 8,878 | I asked my friend who runs a few of them still. He said that yes the 478 only has the SAE #2 (round) housing.
So yes most any heavy duty transmission would fit.
The smallest Roadranger is the model RT(O)-610 or 6610 at 357 lb without oil or clutch housing, about 400 lb installed.
Eaton Fuller and Spicer all make some nice single countershaft 5,6, and 7 speeds that may not be to big. I don't know much about them, other than they are generally synchronized.
Grigg | | | | | Joined: May 2007 Posts: 292 Wrench Fetcher | | Wrench Fetcher Joined: May 2007 Posts: 292 | I see. . .
so i'll have to get the old tape measure out see what i got for room and what i got for option's. . .
Mike
1962 GMC K3000, GMC-379 V6.
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