2.9=>4.0 swap

[truckguy]

the 2.9 in my bronco II is trashed and i'm very interested in doing the 4.0 swap. i found a parts car that has around 120,00 miles on the engine. Is that too many miles?
thanks for the help

 

[okietheranger]

what! That thing is still brand new

 

[BDAB]

yeah ....... they don't typically start having problems till over 200K, is it in the car? do a compression check. if its out of the car atleast change the head gaskets and get the heads fluxed.

 

[truckguy]

the engine is still in the explorer, after i pull it out should i still change the head gaskets and get the heads fluxed?

 

[smokey]

I'd leave the heads be. I'd put on new valve cover and intake gaskets and new plugs while it is out. way easier with the engine out.

 

[BDAB]

the engine is still in the explorer, after i pull it out should i still change the head gaskets and get the heads fluxed?

atleast check the compression before you pull it

 

[koolmilds]

at the minimum, id change rod bearings and the front and rear main seal. my 140+k engine shows nominal wear on the mains, and just starting to show copper on the rods. cheap insurance, rods are $20 for a set, oil pan gasket is $20, rear main is $14, front main is $8.