Time for an overhaul

CopyKat · Dec 17, 2008

Blown a headgasket in the 4.0L so it's comming out and a set of ported heads will be going back on with a full engine gasket kit. Finally get to fixing the Leaky main seals.

I'll be installing the 4.10 diffs and setting up the rear axle with larger arc springs to get rid of the blocks that are on there now.

I'll likely post up some pictures as I go. :icon_welder:

BlackBII · Dec 17, 2008

Sounds like fun.

Are these ported heads aftermarket or ford?

My 4.56's are better than your 4.10's :thefinger:

CopyKat · Dec 17, 2008

This thing is a DD and 4.56 would kill gas milage. Right now the best I've gotten was 20 Mpg. 33's with 3.73's

The original truck the 4.0L came out of was a 91 that had 3.55's and stock 215's. So if you do the math for 33's the best/closest to stock would have to be 4.10's. And that's what I've already got.

The block is a 91 4.0L and it's going to get a set of 95TM Ford heads.

BlackBII · Dec 17, 2008

I used to get around 21mpg with my 2.9, 4.56 and 33's, haven't tested the 4.0 yet, it's still under construction.

Oh, and you were right on the 4.0 swap between 90's being plug and play. (for the most part, tail lights, wipers, radio and other little crap didn't work.)

CopyKat · Dec 17, 2008

BlackBII said:
Oh, and you were right on the 4.0 swap between 90's being plug and play. (for the most part, tail lights, wipers, radio and other little crap didn't work.)

Minor details.

I got a good deal on the 4.10's and rear locker so I'm not bitching one bit.

CopyKat · Dec 17, 2008

Here are some pictures to show reference of Before.

95TM Heads

Springs

Axle

wahlstrom1 · Dec 17, 2008

You should throw in a cam while your at it....Talk to Racin' Ranger on RPS, aka. Trevor. VERY knowledgable guy when it comes to 4.0L's and happens to have 3-4 422 cams lyin on his shelf at work. I can PM you his number if you want.

-andrew

4x4junkie · Dec 17, 2008

CopyKat said:
This thing is a DD and 4.56 would kill gas milage. Right now the best I've gotten was 20 Mpg. 33's with 3.73's

The original truck the 4.0L came out of was a 91 that had 3.55's and stock 215's. So if you do the math for 33's the best/closest to stock would have to be 4.10's. And that's what I've already got.

My friend's nearly identical '93 with 33x12.50s and 4.56 gets the same mileage as my '94 with 4.10s (both right about 21 MPG hwy), but his will easily smoke mine right off the line.
But I guess if ya already got 'em...

fordmandan87 · Dec 17, 2008

if you dont mind my askin do the 95tm heads bolt on with no issues? and what benefits do they have

CopyKat · Dec 17, 2008

fordmandan87 said:
if you dont mind my askin do the 95tm heads bolt on with no issues? and what benefits do they have

The 95 4.0L had a change in piston and combustion chamber shape. Putting the 95+ heads onto an older block will bump compression to 10:1. The use of Premium fuel will be a nessessity to keep from pre-detonation.

All 4.0L OHV heads are the same bolt pattern.

Ya I have the 4.10's already. I stripped a buddies truck and that was payment for stripping it. The 4.10 diff for the front and 4.10 8.8 out back.

Sunk · Dec 18, 2008

What are those springs out of? They don't look like RBV leafs to me....

rickcdewitt · Dec 18, 2008

CopyKat said:
The original truck the 4.0L came out of was a 91 that had 3.55's and stock 215's. So if you do the math for 33's the best/closest to stock would have to be 4.10's. And that's what I've already got.

we're in the same basket there.cheap and available. i liked that my speedo reads real close too.

CopyKat · Dec 18, 2008

Sunk said:
What are those springs out of? They don't look like RBV leafs to me....

They are not RBV. Read around and you may find what they are out of. I've been planning to try these for a while now.

rickcdewitt said:
we're in the same basket there.cheap and available. i liked that my speedo reads real close too.

You wouldn't happen to remember the tooth count/color of your speedo driven gear? From what I remember I have a white driven gear w/3.73's and I need a Yellow one with the 4.10's

Totalled · Dec 18, 2008

FWIW I know someone who has 95TM heads on a '91 long block in his explorer sport. It knocks and pings like crazy even with premium....Hopefully you don't run into that problem.

CopyKat · Dec 18, 2008

Fawkers! Every time I gear up for this I always hear this story. I don't want to have to do this twice. :annoyed:

Time for an overhaul

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