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Old 08-03-2010, 09:23 AM
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Help! 77 Chevy motor swap questions!

Okay, I just bought a 77 silverado with no motor. He said it had a 350 bored to a 383 in it before. So can I buy any 350 based motor and just "bolt it in"? or what all motors can i just drop in?

He also said it had a tranny in it with a 4 speed but had no bell housing or clutch. I want an automatic anyway..

So my questions are, What makes the motors run in these old trucks? after I get it bolted in is there a computer? wires, ect. Sorry i'm so clueless.

I'd like to get some sort of 350 and auto tranny combo.

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Old 08-03-2010, 09:36 AM
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Any older pre-computer small block chevy engine and turbo 350 or turbo 400 trans should be a very easy install . Is this a 2wd ? It makes it easier . If it is 4wd you will need a trans with tailshaft to mate up to transfercase .
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Old 08-03-2010, 09:50 AM
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its a 4x4. But has a "divorced transfer case"? I dont really care about 4wd. But if I were to goto a junkyard what would I need to pull a tranny out of?


Also "pre computer" you just have to drop it in and hook power to it and turn the key? No grasping the concept how the motor works with no electronics.
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Old 08-03-2010, 10:28 AM
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Divorced tranfercase in a Chevy ? My '78 K10 had a married trans/transfer case . If you are going to keep the transfer case you will have to have a trans that bolts up to it . I suggest you get someone local to look at what you have . As for the pre-computer engine/ trans . You will only have the existing '77 wiring to hook up . Alternator , starter , 1 ignition wire . Same truck as mine was . I drove mine for 16 yrs 164,000 mi and sold it while it was still running and driving like a new one but the body was gone .
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Old 08-03-2010, 10:30 AM
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Quote:
Originally Posted by CokeZero
its a 4x4. But has a "divorced transfer case"? I dont really care about 4wd. But if I were to goto a junkyard what would I need to pull a tranny out of?


Also "pre computer" you just have to drop it in and hook power to it and turn the key? No grasping the concept how the motor works with no electronics.

A carb connected to a cable or linkage, and a power wire going to the HEI. Of course, fuel lines connected to the pump and carb will help.
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Old 08-03-2010, 10:52 AM
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Quote:
Originally Posted by Greg T
A carb connected to a cable or linkage, and a power wire going to the HEI. Of course, fuel lines connected to the pump and carb will help.
Sorry , I thought he just needed to know about electrical connections. Of course will have to have a radiator with trans cooler or an external trans cooler , if running an auto trans . Rad. hoses, heater hoses etc. But that's just basics that I assumed any one would know . But is best to suspect everything and assume nothing .
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Old 08-03-2010, 01:20 PM
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might have got in a lil over my head. It has a lift on 44's but the steering rack is unbolted? alot of things are unhooked, I dunno if i'll be able to find out what is what and hook it all back up right.


Also can anyone tell me what vehicle in the junk yard to look for tannies out of?







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Old 08-03-2010, 01:49 PM
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Judging by the pics, it looks like you need a 4x4 trans and transfer case.
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Old 08-03-2010, 10:01 PM
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Damn, I'm starting to get worried that I bit off more than I can chew.

I'll take some pics and video tomorrow to see if any of you can help me with advice on what exactly I need to do.
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Old 08-04-2010, 01:32 AM
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CokeZero,

These trucks that have been raised and big tall tires installed ALWAYS I mean ALWAYS crack the frame where the steering box is bolted onto the frame. You will need to find a patch kit for this repair.

I would think that you will need a 350 engine with a th350 transmission with a married transfer-case two drive lines and a full exhaust system.

Good luck

Scholman(retired)
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Old 08-04-2010, 03:47 AM
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Quote:
Originally Posted by CokeZero
Damn, I'm starting to get worried that I bit off more than I can chew.

I'll take some pics and video tomorrow to see if any of you can help me with advice on what exactly I need to do.
This is a pretty big project for someone w/o experience. 4WD trucks take an even larger array of parts and tools to work on them than a street machine.

Think this over very carefully. If you are going to bail- bail NOW, before you invest anything more into it. The loss you may take by unloading it now will be a cheap lesson. You do not want it to become an expensive lesson.

And who knows, you might make a buck on flipping it...

If you decide to give it a try, there are some good 4WD forums around, you may even have a 4WD club in your area.

Good luck.
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Old 08-04-2010, 06:17 AM
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That looks like it would be a pretty ABLE truck if it was done right, if you do bail, you should be able to get decent money for it.
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Old 08-04-2010, 07:12 AM
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accessory mounting

First look at someone else's running truck to see where alternator, Ps, hoses etc are mounted then you will know what you need,, brackets and locations vary according to what the engine was installed in.
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Old 08-04-2010, 08:58 AM
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This looks like it has had a lot of custom work done to it just looking at the rear axle mounting . Not something I would recommend getting into for a first project unless you have someone experienced to work with you each step of the way . This could get real expensive or not . Read all responses and get someone local to look at it . Like cobalt said , you might be able to make a buck just selling it as is .
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Old 08-04-2010, 10:44 AM
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My plans for it so far is to get a motor and tranny in it just to be able to drive it. (2wd) then a little later start adding to make it back to a 4x4 when I can.
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