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#1 10-28-2008 08:46:17

greg
Newbie
Registered: 10-05-2008
Posts: 8

Re: 1986 jeep engine and tranny swap

i would like to know what entails a swap from 2.8 to
anything dependable. what i was thinking for engines
is possibly a ford 4.0 v6 and tranny or chevy crate
engine 350 small block. i don't know what it takes
though. i have an idea but nothing concrete.

thanks in advance

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10-28-2008 08:46:17

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Re: 1986 jeep engine and tranny swap

#2 10-28-2008 08:48:38

tommy
Helper
Registered: 09-27-2008
Posts: 34

Re: 1986 jeep engine and tranny swap

Greg, you didn't say what year engine you want to swap in.  It does make a difference.  Forget the ford, GM made a substantial portion of your XJ and you will need to stick with it.  But if yo want to put the Chevy small block in, there are some things yo will need to be able to do.  One is fabricate.  If you can't weld and figure out how to make things fit, don't try this with a 4.3 or 5.7


First off, the 5.7L is longer than your 2.8.  This means that you will have to convert from the 2.8 radiator and cowling to the 4.0 radiator and cowling.  To do this, you will have to fabricate a front crossmember to support the radiator.  You will have to covert your hood over to the 4.0 hood latch.  You will have to buy a custom radiator, probably from Griffin Radiator because the 4.0 radiator will definitely not keep your 5.7 cool.  They will barely keep a 4.0 cool.  You will have to fabricate a cowling and attach dual fans to it.  You will have to use a Chevy tranny, if you use the 700R4 or 4L60E, with the Advance adapter on it you will have to move the transfer case back 4" and fabricate a new tranny mount and then change your transfer case from an NP208 to NP231, unless you can find a 208 with a 23 spline shaft, which I doubt.  The chances are good that you will have to change the input gear in the 231 also to 23 spline, most of them are 21 spline.  Then you will have to fabricate transfer case linkage.  I'm still fussing with mine.  You will have to purchase a smaller power steering pully, and the tool to change it because it will hit the power steering box.  Then there is throttle linkage, tranny cooling lines if you use an auto, tranny shifting linkage and wiring and drivelines.


The rest of the stuff you will ned is available from Advance Adapters.  If you look some more, there is a special Yahoo group that has done this.

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#3 10-28-2008 08:49:11

greg
Newbie
Registered: 10-05-2008
Posts: 8

Re: 1986 jeep engine and tranny swap

thank you very much. i have decided with further
research that a 3.4 is the way i want to go for a
couple of reasons. i don' know much and my tranny
will bolt up to the 3.4 with minor modifications. the
research i have done tells me that i should rebuild my
tranny and get a 3.4 from a 93 or newer camaro. this
will give a reliable motor. there is one thing i have
to decide with the camaro motor path fuel injection or
not. there is a company that will splice in the
needed wiring from the camaro to my jeep. i need to
decide if i want to put forth the cash to have it
done. thank you very much with what u have said.

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#4 10-28-2008 08:49:48

tommy
Helper
Registered: 09-27-2008
Posts: 34

Re: 1986 jeep engine and tranny swap

Whatever tranny you have behind your 2.8 now will be reliable behind your 3.4.  You didn't say if you wanted standard or auto.    If you want a 5 sped, I would recommend the Borg Warner T-5.  They are stringer, lighter and have less moving parts and shift easier and smother and are upgradable.  They were available in 84-85.  Fuel injection if you are using MPI will require another fuel pump in the tank.  Another headache I can tell you

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10-28-2008 08:49:48

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Re: 1986 jeep engine and tranny swap

#5 10-28-2008 08:50:32

greg
Newbie
Registered: 10-05-2008
Posts: 8

Re: 1986 jeep engine and tranny swap

i plan on keeping it automatic to keep it fairly simple. i think it
will be worth the headache to convert to FI. I have plenty of time to
change my mind if i have to. i still need to save the money up. this
is the greats thing i have ever found this group rocks!

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