Re: [AMC-List] Trans for 72 232 six

[Tom Jennings <tomj@xxxxxxx>]

> "Holy crap, my spreadsheet says very nice things about those
> gear ratios in my 258 Hornet, 2.73 axle. The 3rd-gear column
> is what I see now in top gear on the A904 I have.

On Wed, 22 Nov 2006, Swygert, Francis G MSgt 436 CES/CECM wrote:

> What the spreadsheet isn't telling you is that the AW4 has a 1.2:1
> torque converter torque multiplication instead of the roughly 3:1 of the
> TorqueFlite converter. This means the AW4 needs to be geared more like a
> manual transmission than a US auto. 

Oh yeah, you mentioned this before, now I get the context. 

> I tried running a 3.08 gear in mine with the torquey 4.6L stroker and
> AW4. It cruised at 70-75, but stressed the engine enough that gas
> mileage dropped considerably compared to the T-96 w/)D and 3.31 rear
> gears. Going to a 3.55 gear improved performance and mileage. I dropped
> about 4 mpg with the 3.08, gained 2 mpg back with the 3.55. I think the
> 3.31 gears are probably the best mileage gears for my combo, but the
> 3.55 is a good compromise. 
> 
> I'm running a 205/70R15 (about 26.5" diameter) tire, so your shorter
> tires help out on the gear ratio. 


That makes (unfortunate) sense. With smaller tires (25") and
a 3.31 axle, it looks pretty nice for a highway hauler:

		1st	2nd	3rd	4th
RPM	CFM	MPH	MPH	MPH	MPH
1000	60	08.1	14.9	22.8	30.4
1200	72	09.8	17.9	27.4	36.5
1400	84	11.4	20.9	31.9	42.6
1600	96	13.0	23.9	36.5	48.7
1800	108	14.7	26.8	41.1	54.7
2000	119	16.3	29.8	45.6	60.8
2200	131	17.9	32.8	50.2	66.9
2400	143	19.5	35.8	54.7	73.0
2600	155	21.2	38.8	59.3	79.1
2800	167	22.8	41.7	63.9	85.1
3000	179	24.4	44.7	68.4	91.2


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