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1986 chevy s10 2.5L to 2.8L swap

 
dblake8806
New User
Posts: 1
Joined: 12/07
Posted: 12/02/07 10:21 PM

my s10 currently has a 2.5L l4 engine with auto tranny. i am wanting to swap a 2.8L v6 auto tranny in to it.
i need to know the following.
1. will it fit.
2. will my 2.5 tranny work on the 2.8
3. will i need to modify the exhaust.
4. what extra work is needed.
thank you and please get back to me via this or at dblake8806@yahoo.com  

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Edward A. Sanchez
Guru
Posts: 1908
Joined: 07/06
Posted: 12/03/07 12:42 PM

Since there were a lot of S-10s with the 2.8, it should be fairly straightforward. You'll probably need different engine mounts, and if you get a 2.8, make sure it's for a longitudinal application. There were a lot of 2.8s in front-drive applications, but I don't know if the casting or bellhousing is the same as rear-drive models. And it's always best if you can find an engine & trans together. Usually makes the swap process smoother. My suggestion is to find a totaled S-10 with the 2.8 with engine & drivetrain intact and in good shape. When you have a complete (or near complete) donor vehicle, it may end up saving you a lot of headaches.  

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jwhitton
New User
Posts: 4
Joined: 12/07
Posted: 12/31/07 08:19 PM

If you are going the trouble to swap the engine why dont you use a 4.3? Aftermarket parts are eaier to get and you could get a MFI turbo version out of a wrecked typhoon or tsunami if your looking to go fast without a V8 swap. The 4.3 engines were avalible in your body style from 1988-1993.  

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Edward A. Sanchez
Guru
Posts: 1908
Joined: 07/06
Posted: 01/07/08 01:39 PM

Good point. The 4.3 will give you a lot more power, and should swap in pretty easily.  

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rocker333
New User
Posts: 1
Joined: 12/08
Posted: 12/04/08 11:09 PM

The power gains aren't even worth the swap. Go with the 4.3.  

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Edward A. Sanchez
Guru
Posts: 1908
Joined: 07/06
Posted: 12/08/08 11:42 AM

Well, the other option is the GM 3.4 crate motor. It has all the same external dimensions as the 2.8, and all the engine accessories & belt drive from the 2.8 will bolt right on. but it really only makes sense if  you already have a 2.8 and are doing an engine rebuild or exchange. If you're doing a full-on swap, I'd probably go straight to the 4.3, too.  

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spoon532
New User
Posts: 1
Joined: 02/09
Posted: 02/24/09 09:48 AM

Hey guys,

I'm also doing a swap to a 2.8 in a '86 GMCS15. (piston snapped and wrist pin blew a hole in the cylinder wall on the 2.5) The 2.8 I have is from an 85 Cherokee when they were still using GM engines. I know I need motor mounts, ecu (cherokee using a carb and it was weak at best), but I'm concerned about wiring. The sensors and stuff should be easy...but... The TBI on the S10 V6s was a dual injector and my 2.5 used a single. How much work is ahead of me for using a dual injector TBI? Is the O2 sensor a problem as well? Confused  

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Edward A. Sanchez
Guru
Posts: 1908
Joined: 07/06
Posted: 02/27/09 06:06 PM

The best advice I could give is to get as much stuff along with the donor engine as possible...engine computer, wiring harness, trans, whatever you can get. Otherwise, it could be a lot of trial & error.  

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