4.0 clutch in 2.9

[ranger]

i wonderd how hard it will be to swap a 4.0 clutch in a 2.9 and how long it would take and the approximate cost and the advantages

 

[engdept]

as long as you can get the transmission out, it is easy.

The benefits are a stronger clutch system. The larger disc will diapate the heat better.

If you have any questions, I have done the swap.

 

[2ranger87]

Level of difficulty and time frame is not really different than installing a 2.9 clutch. You will need to rewire the 4.0 starter to work with a 4.0 flywheel. Cost of parts depends on where you buy, and whether or not you use a new starter and flywheel, or purchase new. (I wouldn't even consider a used cover/disc) While you're in there I recommend replacing the slave cylinder. You can either trim the blockplate to acomodate the slightly larger snout of the 4.0 starter, or get a manual 4.0 blockplate.

There's lots of info in the tech library, do a search for a complete list of parts.

Advantages? A lot better clamping force due to a 10 inch disc, as opposed to the 8 1/2 2.9 disc. Having done many of these swaps on my own trucks (as well as customers) it's definately worth it.

Good luck!

 

[engdept]

Here is a wiring diagram that I created for the 4.0 starter on a 2.9 electrical system.

 

[AllanD]

I have nothing against a used cover/disc

You'd freak if you knew how many shiny new 4.0 clutches I'vefound bolted between
junkyard 4.0 engine and a 4.0 tranny.

One one particular donor I even found the warantee papers for the new
LuK performance clutch in the glovebox.

It was noice when about 3 months later I missed a 2-3 shift and literally
grenaded the friction material off one side of the disc.
The NEW clutch that LuK gave me under warantee is on my truck now.

That clutch has now been on three different 2.9 engines and has been
on my 4.0 for just over a year.

Like I've bene quoted about the 4.0 engine, the 4.0 Clutch flywheel combo
is what the V6 rangers should have had from the beginning.

the original 8-7/8" clutch was "ok" for the 4cyl engines
(which actually got an 8-1/2" clutch) but grossly inadequate
for the 2.9 engine.

The extra grip and the additional 5lb of flywheel makes the engine much smoother.

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