86 s15 to 98 4.3 Jimmy Drive Train Swap - S-10 Forum
 
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post #1 of 12 Old 07-30-2015, 01:34 PM Thread Starter
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Question 86 s15 to 98 4.3 Jimmy Drive Train Swap

Hi all, Newby here. Just wondering if I bought the wrong kind of donor vehicle. I have an 86 GMC s15 extended cab 4x4 with a 2.8 v6 in it. I also bought a 1998 Chevrolet s10 blazer with 4x4 and 4.3 litre Vortec with automatic. I was hoping to put the 4.3 with auto in the S15 but I think I might have bought the 4.3 donor vehicle that may not work. Any suggestions would surely be appreciated. Can I use any of this?

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post #2 of 12 Old 07-31-2015, 05:42 PM
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Re: 86 s15 to 98 4.3 Jimmy Drive Train Swap

Welcome to the forum Dood!

This is a pretty straight forward swap, but you will find that you need the entire drive train (engine, tranny and tcase) but, you will also need the complete harness, fuel pump/tank sensor, and too many more parts to go into here.

Short story: it can be done, but it will be labor intensive.
Basically, everything has to be removed from the donor and installed into the S15.
If you are patient and have the facility and tools, yes - go nuts.
If you want quick and easy, this is not the route.

S10 addiction:
1)'82 S10, 383, 700R4, Shorty
2) '85 S10, 3.4, 700R4 4x4 stretch cab (Redneck)
3) '90 S10 2.5, 5 speed shorty
4) '91 S10, Built 3.4, 5 speed shorty (Voodoo)
5) '92 S10, 2.5, 5 speed shorty, (Barbie)
6) '92 S10, 2.5 5 speed, Shorty
7) 1979 LUV, Buick 3.8 V6, TH 350 Shorty.
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post #3 of 12 Old 08-02-2015, 02:33 PM Thread Starter
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Re: 86 s15 to 98 4.3 Jimmy Drive Train Swap

Thanks so much for the low down on the swap. I've got nothing but time and have the entire 1998 Jimmy for all the parts I need so looks like I will giver a try.
This a great site with a lot of good folks with some very broad knowledge. Pleasure being here. Thanks again.
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post #4 of 12 Old 08-02-2015, 02:35 PM Thread Starter
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Re: 86 s15 to 98 4.3 Jimmy Drive Train Swap

Oh yeah, just curious, what is the quick and easy route? Brief is good with me!
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post #5 of 12 Old 08-03-2015, 01:12 PM
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Re: 86 s15 to 98 4.3 Jimmy Drive Train Swap

What is wrong with your 2.8? Give me the run down on the problems...
Pix are cool too.

S10 addiction:
1)'82 S10, 383, 700R4, Shorty
2) '85 S10, 3.4, 700R4 4x4 stretch cab (Redneck)
3) '90 S10 2.5, 5 speed shorty
4) '91 S10, Built 3.4, 5 speed shorty (Voodoo)
5) '92 S10, 2.5, 5 speed shorty, (Barbie)
6) '92 S10, 2.5 5 speed, Shorty
7) 1979 LUV, Buick 3.8 V6, TH 350 Shorty.
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post #6 of 12 Old 08-05-2015, 08:25 AM
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Re: 86 s15 to 98 4.3 Jimmy Drive Train Swap

Might add that since it is an older than 88.5 (before these trucks had 4.3s available) it will require some firewall modification to make it fit. It is nothing huge...just some hammering here and there. The firewall was redesigned in 88.5 to accomodate that 4.3. Lot of folks say that you could put a V8 in there with that much effort. I disagree because you don't have the hacking to get a radiator in it or struggling with the cooling issues that V8 trucks often have, and you really don't have to hack the truck up to get it in there other than some firewall hammering. Hell man I smashed my firewall tunnel lip in when I put in my 3.4 just to make clearance easier for later repairs. I highly recommend doing that even if you stay stock.



1984 xcab s-10 3.4L GM crate engine 91 S10 TBI swap w bored intake, Edelbrock headers. 2" Rough Country Lift. Custom exhaust, shift kit, e-fan.


EFI swap https://www.s10forum.com/forum/f106/...e-help-513616/

My build thread (3.4L)https://www.s10forum.com/forum/f106/...stions-427168/
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I had to cut my nut in half .
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post #7 of 12 Old 08-06-2015, 09:57 PM Thread Starter
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Re: 86 s15 to 98 4.3 Jimmy Drive Train Swap

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Originally Posted by jimmykicker View Post
Might add that since it is an older than 88.5 (before these trucks had 4.3s available) it will require some firewall modification to make it fit. It is nothing huge...just some hammering here and there. The firewall was redesigned in 88.5 to accomodate that 4.3. Lot of folks say that you could put a V8 in there with that much effort. I disagree because you don't have the hacking to get a radiator in it or struggling with the cooling issues that V8 trucks often have, and you really don't have to hack the truck up to get it in there other than some firewall hammering. Hell man I smashed my firewall tunnel lip in when I put in my 3.4 just to make clearance easier for later repairs. I highly recommend doing that even if you stay stock.

Hey thanks for all the info. I am really hammering myself with what I should do. My 86 s15 4X4 is a sweety but it has a 2.8 with a really bad engine knock. Body and frame need restoration completely. 4X4 is smooth as silk and the vehicle drives as strait as a dye. I do all work myself as I have in the past with other stock trucks. This one has a T5 manual in it. No air and other comforts that I like. I bought a tip over wreck of a 89 s10 Jimmy with a 4.3 Vortec with 210K on it with all the toys. I'm starting to think I might as well have bought a v8 but don't know what tranny or year of engine to get for this one and what transfer cases I would need to do a v8. I like the 4.3 vortex but don't like the idea of all the wiring and electronic transfers. I am currently stripping the 98 Jimmy as the damage to it was only exterior passenger side. I will take the console, electric bucket seats, power windows, doors and ac for my s15 and maybe a few other electrical things. I guess I am trying to figure out how to get 400 hp out of a 4.3 but I think that may be a problem so a v8 is sounding good. I won't lose money on the 98 I bought as I can part out many good parts from it. If you have any suggestions as to which way I might be better off going, I am all Ears!!. V8, or 4.3 with a serious mod and internals to get rid of the electronics. Just not sure.???
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post #8 of 12 Old 08-06-2015, 10:00 PM Thread Starter
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Re: 86 s15 to 98 4.3 Jimmy Drive Train Swap

By the way, thats a sweet truck you have. Cant wait to strip mine down, blast the frame and powder coat it a funky colour.
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post #9 of 12 Old 08-11-2015, 09:01 AM
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Re: 86 s15 to 98 4.3 Jimmy Drive Train Swap

V8 is cool but it is a lot of work to get the cooling right and it will be a bitch to work on. Since you already have the 4.3, I'd go ahead and put it in and use it. If you decide you want to go V8 later, the swap will be easier. It will all bolt up to the transmission that would be connected to the 4.3. So that wouldn't be a waste by any stretch of the imagination.



1984 xcab s-10 3.4L GM crate engine 91 S10 TBI swap w bored intake, Edelbrock headers. 2" Rough Country Lift. Custom exhaust, shift kit, e-fan.


EFI swap https://www.s10forum.com/forum/f106/...e-help-513616/

My build thread (3.4L)https://www.s10forum.com/forum/f106/...stions-427168/
Quote:
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I had to cut my nut in half .
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post #10 of 12 Old 08-11-2015, 09:31 AM Thread Starter
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Re: 86 s15 to 98 4.3 Jimmy Drive Train Swap

Thanks Jimmykicker thats great to know!
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post #11 of 12 Old 08-12-2015, 05:07 PM
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Re: 86 s15 to 98 4.3 Jimmy Drive Train Swap

Take pictures and log it here. Should be a cool swap.



I've had wayyy to many of these trucks. (Currently...on number 7)

1988 S-15 - 5.5/6 drop

1985 S10 Blazer 4WD

1998 Blazer ZR2 5 Speed!

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3 doors for 1 and a half whores
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He only bought one wheel. So every picture we see is going to be a pic where either the rear or front is conveniently out of frame.

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post #12 of 12 Old 08-13-2015, 04:42 PM
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Re: 86 s15 to 98 4.3 Jimmy Drive Train Swap

I considered this on my truck too. I probably would have done it if it were an 88 1/2 or newer. Firewall will be a little struggle, but nothing insurmountable.



1984 xcab s-10 3.4L GM crate engine 91 S10 TBI swap w bored intake, Edelbrock headers. 2" Rough Country Lift. Custom exhaust, shift kit, e-fan.


EFI swap https://www.s10forum.com/forum/f106/...e-help-513616/

My build thread (3.4L)https://www.s10forum.com/forum/f106/...stions-427168/
Quote:
Originally Posted by Racer_X View Post
I had to cut my nut in half .
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