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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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For helping keep this great
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on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Aug 2007 Posts: 5 Junior Member | | Junior Member Joined: Aug 2007 Posts: 5 | Hello all, I was directed over here from the 67-72 pickups forum with a question. This truck has been stored in the barn at my grandparent's house for a number of years, was taken off the road about 10 years ago. Believe it to be a 63 or 64 model. Just trying to accumulate as much information about the truck as I can. It's an aluminum body (Grumman-Olson) stovebolt 6 truck with a 4 speed, still starts right up but the fuel lines need replaced. Picture 1 Picture 2 Picture 3 | | | | | Joined: Jun 2006 Posts: 272 Shop Shark | | Shop Shark Joined: Jun 2006 Posts: 272 | Hi jjorgensen52,
Welcome to The Stovebolt! I can't help you with your inquiry but I am sure somebody will pipe in with some knowledge about your step van. You say it has a stovebolt 6 in it? It reminds me of a milk delivery truck. It sure is in nice condition and would be fun to restore. Good to have you on board!
littlebuddie
1948 AD Pickup
| | | | | Joined: Nov 2002 Posts: 1,002 Shop Shark | | Shop Shark Joined: Nov 2002 Posts: 1,002 | Looks like it could be a fun van for the flea market or camping. The engine would be a 230/250/292, measure the height of the side covers behind the distributor, if 6" high it's a 292, if 4" 230/250. IF 230/250 have to check the number on the distributor pad to determine which one. The transmission is probably a SM420 if 4 speed. I'm guessing the wheels are eight lug, so check this thread to find out gear ratio.
http://www.stovebolt.com/bboard/cgi-bin//ultimatebb.cgi?ubb=get_topic;f=2;t=014431
Most of your mechanical questions will get answers fairly easy, bt not many of those old vans around. I'd love to fall into one, neat.
Welcome aboard
Larry
I don't own a vehicle that isn't old enough to drink.
| | | | | Joined: Dec 2005 Posts: 92 Wrench Fetcher | | Wrench Fetcher Joined: Dec 2005 Posts: 92 | Welcome to the stovebolt
Good luck getting info on this I had been at it for two years
If you’re going to restore it I will help you all that I can
PM me and I can send you more.
What is it GMC or Chevy??
If it is a Chevy it is a Chevrolet model #3742 3/4ton. Is a 125 1/4 wheelbase.
Or the 1ton is a model # 3942 with a 137” wheelbase forward control chassis
If it is a GMC it is a PM 152-
The Grumman Olson Kurb Side is the Alloy Body and it came in the Comet Clipper and Peak Loaded.
all are G.V.W. Standard Tires6200 GVW 7000 lbs Maximum Tires
(Comet) T3-8 is a 104” wheelbase 8 ft. 1080 LB. Alloy Body 1 1/4 ton payload capacity 300 cu. Ft.
(Clipper)T3-10 Is a 10 ft. 1275 LB Alloy Body 1 1/4 ton payload capacity on a 125” wheelbase 360 cu ft. payload?
(Peak Loaded)T3-12 is a is a 125” wheelbase 12 ft. 1470 LB. Alloy Body 1 1/4 ton payload capacity 440 cu. Ft.
I have a 1952 GMC Grumman Olson Kurb Side.
It is the Comet T3-8
Grumman stepvan or a DUBL-DUTI or a
GMC DUBL-DUTI Grumman
Morgan Olson Step Van
(Formerly Grumman Olson
Milk truck bread truck route van
Maxx
52 GMC Grumman Olson Kurb Side stepvan T3-8(Comet)69 GMC 1/2-ton
| | | | | Joined: Mar 2005 Posts: 311 Shop Shark | | Shop Shark Joined: Mar 2005 Posts: 311 | I can't help you either, but you have found the right place to ask! Someone will come along and answer your questions! Welcome to the Bolt.
Always get a 2nd opinion, especially if I am the source of the 1st opinion.
| | | | | Joined: Aug 2007 Posts: 5 Junior Member | | Junior Member Joined: Aug 2007 Posts: 5 | Thanks for all the quick replies, folks.
I know for a fact the truck was a chevy originally. I also believe it to be the 125" wheelbase, but I am going to be there this weekend so I can check that out. I have a few more pictures I will post up some time tonight for anyone interested. | | | | | Joined: Aug 2007 Posts: 5 Junior Member | | Junior Member Joined: Aug 2007 Posts: 5 | | | | | | Joined: Dec 2005 Posts: 92 Wrench Fetcher | | Wrench Fetcher Joined: Dec 2005 Posts: 92 | Is the box 10ft. or 12ft?.
Maxx
52 GMC Grumman Olson Kurb Side stepvan T3-8(Comet)69 GMC 1/2-ton
| | | | | Joined: Aug 2007 Posts: 5 Junior Member | | Junior Member Joined: Aug 2007 Posts: 5 | Not sure about the box length, I will check that, the rear axle and the motor / tranny this weekend. | | | | | Joined: Aug 2007 Posts: 5 Junior Member | | Junior Member Joined: Aug 2007 Posts: 5 | So here is what I found this weekend:
The truck itself is on a 125" wheelbase with a 10 foot box, according to the GVW plate I found it's rated at 7000lbs. It also has a 2 piece drive shaft.
I was only able to find one marking on the rearend, ML918.
The trans is a four speed, but outside that I was unable to verify anything. It is a very short box and it has a full cast iron bell housing.
The motor, as I said before is not original, but the side of the block has "348675 GM" cast on it in raised letters | | | | | Joined: Dec 2005 Posts: 92 Wrench Fetcher | | Wrench Fetcher Joined: Dec 2005 Posts: 92 | So it is a T3-10 Clipper Is a 10 ft. 1275 LB Alloy Body 1 1/4 ton payload capacity on a 125” wheelbase 360 cu ft. payload G.V.W. Standard Tires6200 GVW 7000 lbs Maximum Tires
Maxx
52 GMC Grumman Olson Kurb Side stepvan T3-8(Comet)69 GMC 1/2-ton
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. Otherwise, also remembered that the trans and motor in the truck are not the originals, but are from another truck of this vintage (my grandfather owned 3 or 4 of these at one time 
)