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I have a 4.56 (AQ Posi)rear end unit that presently has 4.11 gears installed. The question is, can I put 3.70 gears into the AQ Posi unit. If not what is the part number for a 3.70 Posi. The 4.11 has a de-acceleration whine that would not pass PV. I want to keep the original housing in the car as there were not that many that came from the factory with 270-3 Spd Close-ratio and a 4.56 Posi. Does anyone know the number of units that rolled out in 57.
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Re: C-1 R/E Gear Change
Check the driveshaft flange nut and see if it is loose. Sometimes, they will loosen and you will get a whine on de-cel. Or you just need new pinion bearings and a professional set-up on these gears.
I've forgot more than I know but I believe the 4 posi carriers will not accept 3 gears. But why change the ratio?
Mike -
Re: C-1 R/E Gear Change
When I went to change my 4.11 I was told there is a very rare spacer to use a 3 series in the 4 carrier. It sound slike it can be done but it is tricky. I found a second carrier but I know you dont want to swap rear ends. You might contact a couple rear end guys and ask about the spacer.
Todd.Comment
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Re: C-1 R/E Gear Change
The ring gear spacers are available from several aftermarket sources, but are not a great idea if you're going to beat on the car hard; they require longer ring gear bolts, and the shear stress on the bolts is doubled.Comment
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Re: C-1 R/E Gear Change
You can 4 series gears with a 3 series carrier and a ring gear spacer.
The 4 series pinion is considerably smaller (about 1/4") than the 3 series pinions so the ring gear must be closer.
It does not work the other way.
VerleComment
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