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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!
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| | | | Joined: Nov 2008 Posts: 49 New Guy | | New Guy Joined: Nov 2008 Posts: 49 | my 40 1/2 ton has a straight six numbers are 3886848 how can I find what cubic inch this is or does someone out there know? I am kicking the idea of leaving this engine but want to change trannys. It now is geared to high rpm at about55mph.Will probably change rear ends also.I have a 4/11 from a s10 blazer. I am open for input. What tran. will bolt up to this engine? will thr blazer rear end work well with the 6 banger. Automatic or 5 speed? what is the best combo. Ideas please. | | | | | Joined: Apr 2006 Posts: 506 Shop Shark | | Shop Shark Joined: Apr 2006 Posts: 506 | Are those numbers from the head.
Should be some good numbers, cast and stamped, on the distributor side of the block.
-Tom
1950 Chevy 3100 w/ 1956 235
| | | | | Joined: Dec 2004 Posts: 1,897 Shop Shark | | Shop Shark Joined: Dec 2004 Posts: 1,897 | Is this a chevy or gmc? If chevy and original it will be a 216. If gmc and original it will be a 228. The 1/2 ton you have is already geared with 4.11 gears, and uses a torque tube.
The choices for transmissions you can use is severely limited by that torque tube. You can get the pumpkin out of a 54-62 chevy 1/2 ton and move to an open driveline. 3.90 and 3.38 gears are available for the later open drive axle. Once you make the move to an open driveline, transmission choices increase. The T5 5 speed is very high on the list.
Of course with the need fo speed there is also the need for better braking. The stock brakes are not even close to being up to that task. | | |
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