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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: Sep 2008 Posts: 59 Wrench Fetcher | | Wrench Fetcher Joined: Sep 2008 Posts: 59 | I purchased a 1998 3/4 chevy for the vortec 5.7 and 4l80E to swap it into my 1957 LCF. Was planning on using a manual transmission but was able to pick up this truck reasonably so I decided lets give her a whirl. Stay tuned, I may wish I didn't go there but it should be worth a try given my dislike of carbed engines. Time to go to the library and get service manuals / wiring diagrams.
Well I may have picked a winner so to speak. I checked compression on the new purchase, 175 - 190 psi, removed a valve cover and no sludge, in fact too clean for 225K miles. I suspect it has been rebuilt / replaced at some point but time will tell.
Ryan
Last edited by teamja2; 01/19/2009 2:35 PM. Reason: update
| | | | | Joined: Nov 2005 Posts: 6,100 'Bolter | | 'Bolter Joined: Nov 2005 Posts: 6,100 | | | | | | Joined: Nov 2006 Posts: 2,544 Shop Shark | | Shop Shark Joined: Nov 2006 Posts: 2,544 | I think Painless Wire Harness have a pre-made set up that will work for you. | | | | | Joined: Mar 2005 Posts: 1,636 'Bolter | | 'Bolter Joined: Mar 2005 Posts: 1,636 | If you have the complete vehicle, use the computer and wiring from it. Not really that bad of a job. | | | | | Joined: Sep 2008 Posts: 59 Wrench Fetcher | | Wrench Fetcher Joined: Sep 2008 Posts: 59 | Yes, the plan is to use the original harness, computer, transmission, etc. I have yet to do a vortec swap and came into this truck for the same money as a TBI donor vehicle. I have swapped TBI's just not vortecs. I have to figure out who I know that works as a GM tech so I can get the wiring diagrams to see what needs to go and what needs to stay. There is someone local here in Missouri that reprograms the PCM's to take out the vats and at the same time he will program axle ratio / tire size and get rid of the emissions stuff.
I managed to get the trans out today, engine ready to go except for mount bolts and 2 rounded exhaust nuts.
With the 4l80E that should also solve the low gear ratio problems and get a better cruising rpm.
Ryan | | | | | Joined: Jul 2007 Posts: 224 'Bolter | | 'Bolter Joined: Jul 2007 Posts: 224 | i have a 98 chevy 5.7 mine has the 5 speed makes good power
and its the best stick shift i have ever driven. philip | | |
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