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Hey mate, did you end up buying any 3.9s? I've been looking and it seems choices are junk, or junk and the only way to fix the problem with them is to run the gears through the lapping tank to get them to run smooth. But doing the latter means sending them to Adelaide.Well 5th gear 2000 rpm on the cluster was 102kph on the GPS so looks like despite the sticker on the diff it has the correct ratio. At least old mate did something right.
Make it easy for yourself, get an OEM 3.7 gearset...Hey mate, did you end up buying any 3.9s? I've been looking and it seems choices are junk, or junk and the only way to fix the problem with them is to run the gears through the lapping tank to get them to run smooth. But doing the latter means sending them to Adelaide.
Make it easy for yourself, get an OEM 3.7 gearset...