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| GMC Truck Forum - GMC truck talk, etc. |
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| | #1 |
| Junior Member Join Date: May 2006
Posts: 2
| Hello, Not sure if the auto tranny in the truck is stock or not so I don't want to go off the books. Does anyone know where I look on the transmission to identify it? The reason I ask is because I have to rebuild the 402 engine in the truck but I am thinking about replacing it with a 350 crate motor and I need to know if I can resuse the bellhousing, etc etc. Thanks in advance. Patrick |
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| | #2 |
| Moderator Join Date: Apr 2006 Location: Texas
Posts: 2,772
| look at the pan. if i remember right, there should be 16 or 17 bolts. correct me if im wrong someone. 17 bolts are the 750r without overdrive and the 16 is the 750r with overdrive. i believe that the 350 tranny is going to have 16 bolts on a fairly square pan. might want to make sure that is right before much of anything though. its been a couple years |
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| | #3 |
| Junior Member Join Date: May 2006
Posts: 2
| Thank you for the info. I was just thinking to myself though that if I swap out to a 350 I'll need to buy headers, intake, etc etc. Now I'm thinking it is better just to swap out the motor. Just was trying to save some gas. I guess I still have some planning to do. Thank you for the info because it is still good to know what I have. Thanks, Patrick |
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| | #4 |
| Moderator Join Date: Apr 2006 Location: Texas
Posts: 2,772
| i do agree with you there. i priced a rebuild and turned around to price a new crate and they were close enough for me to spend the extra just to have a new block. but that is also turning my old block in for a core. wish the best of luck to you. |
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| | #5 |
| Moderator Join Date: Apr 2006 Location: Texas
Posts: 2,772
| sorry, meant 700r tranny |
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| | #6 |
| Moderator Join Date: Apr 2005 Location: Texas
Posts: 3,104
| If the pan is square it is a 700R, if the pan is square with one corner cut on the back end it is a 350. 400 pans look wierd, kinda hard to explain. If you can snap a picture of it we can tell you.
__________________ John Wayne 2000 F-350 7.3L Powerstroke 4x4 |
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| | #7 |
| Full Member Join Date: Feb 2006
Posts: 25
| The Th400 pans are shaped like the state of texas. I have one behind my 350 in a K2500. |
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| | #8 |
| Senior Member Join Date: Sep 2005 Location: ALABAMA
Posts: 3,160
| Go to summits website and look up transmission. They have alot of pan gaskets and aftermarket pans pictured. Compare to your and there you have it.
__________________ When i die, i dont want to walk gracefully thu the pearly gates and turn in a unused body. i want to go sliding thru sideways and turn in a body that has been completely used up. |
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| | #9 |
| Junior Member Join Date: May 2006
Posts: 3
| yes u can reuse the bell housing,the're the same from six cylinder to to a big block chev |
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| | #10 |
| Senior Member Join Date: Sep 2005 Location: ALABAMA
Posts: 3,160
| How many speeds? If it is a 3 speed then it sounds like you got a th400.
__________________ When i die, i dont want to walk gracefully thu the pearly gates and turn in a unused body. i want to go sliding thru sideways and turn in a body that has been completely used up. |
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