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#17054 10/08/2003 7:10 PM | Joined: Apr 2003 Posts: 67 Shop Shark | | Shop Shark Joined: Apr 2003 Posts: 67 | Hi folks,
I have a mint '58 GMC 2.5 ton with a seized 270 and a Muncie SM420. I am negotiating long distance on a low mileage 292 from a '66 Chev 5 ton (attached to a NPC96051 5-speed).
Will the 292 just 'bolt up' ? Are the external dimensions such as block length, motor mounts, bolt holes to bellhousing, etc. the same ?
Anything else I need to know ?
As a secondary question, would there be any advantage (or ease or feasability) in swapping to the NP transmission - like overdrive ? Or, would this tranny just be too big ? My truck has a 'flat floor'.
Any help is greatly appreciated.
Royzell in Shawnigan Lake B.C.
51 GMC COE (on '76 GMC drivetrain)
58 GMC 2.5 ton
83 GMC campervan
81 Mercedes turbodiesel wagon - kid and dog hauler
and 2 1986 GM parts vehicles
Royzell
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#17055 10/09/2003 5:48 AM | Joined: Oct 2003 Posts: 5,152 Cruising in the Passing Lane | | Cruising in the Passing Lane Joined: Oct 2003 Posts: 5,152 | How about 'I don't know' for an answer?
I'm pretty sure the bellhousing attached to the 270 will not fit the 292. I don't know if the bellhousing between the 292 and that 5-speed will fit the SM420.
I'm quite sure you can get a bellhousing for the 292 that will bolt to the SM420. I say that because the SM420 was still used into the middle '60's. You'd need one from about '63 to maybe '66.
The question is will that bellhousing bolt to the crossmember in the '58. I'm sure it could be adapted.
I know I haven't helped much, but I hope my little bit of knowledge will help you get the answers you really need...
1955 1st GMC Suburban | 1954 GMC 250 trailer puller project | 1954 GMC 250 Hydra-Matic | 1954 Chevy 3100 . 1947 Chevy COE | and more...
It's true. I really don't do anything but browse the Internet looking for trouble... | | |
#17056 10/09/2003 11:51 AM | Joined: Jan 2000 Posts: 206 Member | | Member Joined: Jan 2000 Posts: 206 | The 292 is far from a bolt-in. It uses a V8 bellhousing and side motor mounts. It will require some fabrication of rear crossmember to use that bellhousing, whatever transmission you use. | | |
#17057 10/09/2003 6:09 PM | Joined: Jun 2000 Posts: 2,773 'Bolter | | 'Bolter Joined: Jun 2000 Posts: 2,773 | Sixpack is right. About all these engines have in common is that they are both sixes. Mounts, bell housing, length, width, height are all different.
Fred
52 3600
69 C-10
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#17058 10/10/2003 12:39 AM | Joined: Apr 2003 Posts: 67 Shop Shark | | Shop Shark Joined: Apr 2003 Posts: 67 | Hey guys, thanks for the feedback and info.
I think I'll still buy the 292 but save it for an AD pick-up or burb I want to find and build.
The bellhousing and 5-speed may yet go into my '58.
The '66 Chev 5 ton donor truck has been stripped down to the frame. I'll see if I can get the crossmembers from it and if they will fit my '58 with a small block chev ( I have a 305 and a 350 on hand).
I have also heard that the crossmember from a full-size Jimmy or Blazer will work.
Any knowledge on that one ?
Thanks again.
Royzell in Shawnigan Lake B.C.
Royzell
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#17059 10/10/2003 11:24 PM | Joined: Jun 2000 Posts: 15 Wrench Fetcher | | Wrench Fetcher Joined: Jun 2000 Posts: 15 | Hey, you're on the west coast; buy that GMC 302 on eBay that ftyler posted! 
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