1g '92gsx: 6bolt to 7bolt shortblock swap?

[Ghosty]

I've got an early '92 Eclipse GSX, 6-bolt (pre-April'92), which threw a rod. I'm thinking of buying a 7-bolt shortblock from a '93 GSX. It's '93 head is not available. I'd like to keep the existing '92 head, tranny, turbo, x-fer case, etc.

So far, after talking to two DSM gurus and three Mitsubishi dealer-mechanics, I've come up with about three different answers, hence the confusion!

Here's my best GUESS at what I'll need to do this:

New '93 7-bolt flywheel, new overhaul gasket-set. What else do I need?

Cylinder Head, manifolds, Pressure-plate, clutch, input shaft, tranny-housing pattern, rear main-seal, gaskets, clutch linkage, etc. are ALL THE SAME between the two...? Also who can tell me about the input shaft (23-spline vs. 24-spline?)

If it's much more complicated, should I just be looking for a complete longblock instead?

I'm not a DSM guru, so any help and advice is appreciated. Thanks much!

[Hal]

Originally posted by Ghosty
Here's my best GUESS at what I'll need to do this:

New '93 7-bolt flywheel, new overhaul gasket-set. What else do I need?

Cylinder Head, manifolds, Pressure-plate, clutch, input shaft, tranny-housing pattern, rear main-seal, gaskets, clutch linkage, etc. are ALL THE SAME between the two...? Also who can tell me about the input shaft (23-spline vs. 24-spline?)

You'll need a 7 bolt flywheel... FWD & AWD are different sizes, so get the right one.

The spline count is an issue, but if really need to, you can simply swap the output shaft between the transmissions.

All of the engine parts are "swappable" except for the oil pan and oil pump. The transmission MAY have different length shift levers on it (but I don't believe so).

If it does, you will need the shifter and cables from the donor.

Clutch & linkage components are interchangable.

All of the gaskets are the same as is the trans bolt pattern.

Hal

[Ghosty]

That's EXACTLY the kind of info we were looking for. Thanks much. Three different Mitsu dealers didn't know exactly, but were instead guessing.

[Van]

90's and early 91's have 22 splines, everything else oughtta have 23 splines.

Likewise, the 90's and early 91's have the "odd" shifter arms, cables and shifter.

No such thing as 24 spline.