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Old 03-11-2008, 01:10 PM   #1
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Default 4T65E-HD with 3.05 FDR?

Has anyone ever heard of a 4T65E-HD with a 3.05 final drive ratio?

If so, exactly which model(*) / year(*) was it available on?
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Old 03-11-2008, 01:39 PM   #2
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Never. The 3.05 was available only on mid-level Bonneville'* and Olds 88/LSS'*, top of the line Lesabres, LS model Regals, Chevrolet Impala'*, Monte Carlo'* and mid-level Park Avenue'*. I can't think of any other cars that it came with, but there were ZERO 4T65E-HD'* with the 3.05 gear ratio.
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Old 03-11-2008, 01:51 PM   #3
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You could probably make one swaping the sun gear and planetary pinion gears from the 3.05 diff into the 3.29 HD diff.

Never heard of a 3.05 HD tranny as a stock option though.
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Old 03-11-2008, 02:43 PM   #4
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Quote:
Originally Posted by 95naSTA
You could probably make one swaping the sun gear and planetary pinion gears from the 3.05 diff into the 3.29 HD diff.
That was my next thought. In my mind, I don't see that as possible, though.

I know they all use the same outer ring gear (78 tooth fine pitch). I know the sungears have different tooth counts (34 for 3.29, 38 for 3.05), from which I would assume they are different diameters, and that the planetaries would therefore have to be different diameters also.

If this is so, then I don't see how the shafts for the planetaries could be the same size and/or in the same location on the carrier...I would think these shafts on the 3.05 would have to be either drilled further from center or be a smaller diameter than on the 3.29.

I've got a 3.29 HD diff sitting here. I may have to scrounge up a 3.05 non-HD diff to see if this is possible.
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