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Mod | | Forums66 Topics126,776 Posts1,039,271 Members48,100 | Most Online2,175 Jul 21st, 2025 | | | Joined: Jun 2012 Posts: 60 Wrench Fetcher | Wrench Fetcher Joined: Jun 2012 Posts: 60 | The 46 1/2 ton I have purchased came to me without an engine or trany . I was thinking of using a carburated 4.3 V6 and T5 trany that I have on hand It was goingto go into a 28 chrysler I had but someone else wanted it real bad .Has this engine/trany combo been tried before . Your thoughts would be appreciated . Thanks 
Allan 1946 GMC 1949 Mercury M68
| | | | Joined: Jun 2009 Posts: 1,596 'Bolter | 'Bolter Joined: Jun 2009 Posts: 1,596 | I'm not sure what you mean by "has this engine/tranny combo been tried before"?
It was used in S-10's and some half-tons.
This combo should get you decent mileage, providing the rear tire size and diff give you a good final gear ratio. It should work just fine.
Do you have any photos of your GMC? I'm also building a 46 GMC and I'm in the Edmonton area.
Last edited by 46gmcpu; 07/05/2012 3:27 PM.
| | | | Joined: Jun 2012 Posts: 60 Wrench Fetcher | Wrench Fetcher Joined: Jun 2012 Posts: 60 | I am going to pick up the truck from Saskatchewan on Saturday . When I figure out how to put pictures on this site I will be more than happy to .
Allan 1946 GMC 1949 Mercury M68
| | | | Joined: Nov 2006 Posts: 324 Shop Shark | Shop Shark Joined: Nov 2006 Posts: 324 | I've got a 4.3 v6 TBI and 700r4 combo in my 51 and she purr's real nice. Seems to have all thepower I need for a cruiser. | | | | Joined: Apr 2008 Posts: 133 Shop Shark | Shop Shark Joined: Apr 2008 Posts: 133 | got the 4.3 with a 700r4 in my plymouth and i like the combo. i've got a 500cfm edelbrock carb on mine.
daren
| | | | Joined: Aug 2007 Posts: 1,859 Grumpy old guy playing with trucks, cars, and boats | Grumpy old guy playing with trucks, cars, and boats Joined: Aug 2007 Posts: 1,859 | if you have the older carbed version, it was fairly limited in hp - I think 140hp to 150hp range, however there are plenty of parts available.
if it was mine, I would swap out late model vortec heads with matching intake, a decent cam, and a 600 cfm engine then again, I do that with nearly all my projects.
The problems we face today can not be addressed at the same level of intelligence we were at when we created them - Albert Einstein Or with the same level of $ - Me
| | | | Joined: Jun 2012 Posts: 60 Wrench Fetcher | Wrench Fetcher Joined: Jun 2012 Posts: 60 | Its a vortec engine , Ihave the edlebrock manifold andcarb for it allready along with an early style HEI distributor .Cam is in the plan along with a bit higher compression pistons .Also plan to use the T5 and rear end out of the donor S10 .
Allan 1946 GMC 1949 Mercury M68
| | | | Joined: Apr 2005 Posts: 1,971 'Bolter | 'Bolter Joined: Apr 2005 Posts: 1,971 | I would thing the 4.3 would be as great of an engine in the old truck as it is i n new ones. I drive a 4.3 with TBI and love it. | | | | Joined: Jun 2009 Posts: 1,596 'Bolter | 'Bolter Joined: Jun 2009 Posts: 1,596 | I have a 4.3 I plan on using in a future project, keeping the fuel injection and the overdrive automatic. That way the other half can just turn the key and go. | | | | Joined: Jun 2012 Posts: 60 Wrench Fetcher | Wrench Fetcher Joined: Jun 2012 Posts: 60 | The donor truck was a 95 S10 with a 4.3 V6 and T5 . TBI had been stripped for parts when I got it . Also The other half (my wife ) loves to drive a standard and I grew up in the trade with points type ignitions and carbs (way more play value for me) .So for us It's a good combination .
Allan 1946 GMC 1949 Mercury M68
| | | | Joined: Mar 2011 Posts: 457 Shop Shark | Shop Shark Joined: Mar 2011 Posts: 457 | I have the 4.3 with 5 speed manual trans in my '89 and love it. My dream would be, if I ever want to dump the tired 216 in my '40, this would be an awesome, fun to drive combination! And, being shorter than the bolt, you can do AC, etc. easily. But then again, that old bolt sounds pretty good...... 
Last edited by 40casey; 08/03/2012 9:22 PM.
1940 Chevy 1/2 ton pickup "KC" A day without sunshine is like, well, ..... dark! | | | | Joined: Mar 2003 Posts: 1,132 Shop Shark | Shop Shark Joined: Mar 2003 Posts: 1,132 | I bought a Chevy truck new in 96 with a 4.3 & 5 speed. This truck would go 600 miles on a tank of gas.Thats about 19.4 MPG. My 06 with the 4.3 and automatic will only do 500 miles on a tank of gas. Thats about 16.2. So they are relatively thrifty. If I already didn't have the 283 installed I would go to the 4.3 in a minute.
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