I/m getting a little more serious about an Ecotec swap. I bought a low mile LE5, and from a link in this forum, found a brand new getrag for a Quad 4. I bought it, as the internal parts should interchange, and I do have a couple of problems with mine. I got to looking at the Quad 4 pattern, and it looked as if a couple of holes were similar. I took a quick check - nothing fancy, just tapped out a paper "Gasket", held it up to the Ecotec, and it looks like both of the dowel holes and one additional bolt hole match. Does anyone know if this is the actual case? Otherwise, I can set the transaxle up in the mill, and dial in on each hole, but if the dowels match, life just got easier - all of the other holes are pretty well just clearance holes.

Thanks in advance for any knowledge that anyone might have.

Nothing better then a dimensional drawing from GM. I have not found one yet for the quad-4 yet.

http://tunersource.gmblogs....smission-pattern.pdf

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yellow 88 GT, not stock
white 88 notchie, 4 banger

Let us all know how close it is, there are a few Quad 4 Getrags around, and more than a few Quad 4 Isuzus.

Can you not hold the trans to the engine and physically try it?

-JOE

[This message has been edited by joesfiero (edited 02-26-2008).]

The Quad 4 Getrag is a 282.. the Ecotec getrag is a completely different animal. Obviously the bolt patterns are different, and as far as I know there are no interchange parts. Don't get to into that tranny if it turns out you can't use it. Keep in mind that even if three holes line up the input shaft isn't necessarily centered on the crankshaft.

quote Originally posted by Steven Snyder: Keep in mind that even if three holes line up the input shaft isn't necessarily centered on the crankshaft.

In fact, the bolt holes all might line up and it STILL doesnt guarantee that the input shaft is centered.

Still, this is a neat bit of information that might prove useful to someone...

I am using a 282 gertrag. Ok, took a closer look at it, yes, the dowels are the same co-ordinates from the crank center, but the pattern is rotated by about 15 degrees. I split the case on the gertrag, put the bellhousing half in the mill, set the case at the correct angle - the way it sits in the car, and dialed in each bolt hole and read the co-ordinates off of the DRO last night. Bought a chunk of plate today, I will try to fab the adapter plate tomorrow, as long as it keeps raining. Looks good so far - bought some mount brackets and mounts from Rodney, I should be able to use the stock transaxle mount location and monut. Left axle will work with no problem, I am thinking that the right will also with a little surgery on the Ecotec block. Planning to use the front trunion mount on an A-frame, and will put a dogbone on the bottom. I'll see how it goes.

Mike

Could I have the DRO coordinates of the quad bell housing to add to my data base?

Thanks,

Chuck

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yellow 88 GT, not stock
white 88 notchie, 4 banger