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#1 |
Registered User
Join Date: Mar 2004
Location: Lillington, NC
Posts: 19
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engine swap
i want to swap out the 250 in my 83 c10 with a 350 also convert from manual to auto trans , how diffucult is this to do, i have the time my truck just sits in the driveway
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#2 |
Registered User
Join Date: May 2004
Location: Llano,TX
Posts: 113
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I'm about to do the same thing with a '77. From what people have told me, The motor and trans crossmember will work, but you'll have to move them on the frame. You'll need a radiator for a V-8 with bungs for the trans cooler lines. You'll need a auto column and all the linkages that go with it, or a auto shifter like lokar makes. Some have told me a 350 with a th350 will have the same driveshaft length as a 250 with the 3 speed. Some have said I will need a different driveshaft. That's as far as I've gotten, I'm waiting to pick up a dead 350/th350 from a friend. Maybe someone who has actually done this will chime in and help us both.
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‘66 Chevy C-10, long bed fleetside, 350, 3 on the tree, 4-7 drop. '77 chevy C-10 Custom Deluxe, 350, SM465 4 speed, flatbed. '80 jeep CJ-5. ‘14 Chevy 1500 Z71… |
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#3 |
Registered User
Join Date: Mar 2001
Location: Nashville, Tennessee
Posts: 225
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I did the exact opposite. I pulled a 350/350TH from my '73 C10 and installed a 250/3spd on the column. Long story as to why, but this is also a farm truck so it just needed to run.
You just need to move the rubber engine mounts up one set of holes on both sides. Most engine towers I have seen have 6 and 8 stamped on them after you clean the grease off. When I put the 3spd in, I did Not have to move the trans crossmember at all, but I did have to change the front shaft (mine is 2 piece). You will want to get a V8 radiator and fan shroud as well. It's pretty much a bolt in affair. Not really any modifications that stand out in my memory. ![]() Good luck, Keith
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