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Allison VS2 Transmission ? Chuck 1-9-10  
I am running a vintage (70s?) Detroit Diesel non turbo 671 motor and a Allison VS2 Transmission. The current transmission shift points are creating a serious power loss and therefore a performance issue that I am tryng to remedy.

The Allison is a 2 speed with a "fluid drive" 1st gear and then a direct drive with a overdrive for freeway speeds. The rear end gear is long legged and it runs 65mph at 1600 RPM. The issue lies with a shift out of "fluid drive" 1st gear to direct drive - occuring at 1600 RPM (the motor is just coming into it's power curve when it shifts). If this shift takes place on a incline the vehicle immediately loses power and starts to descelerate. The vehicle will shift back to fluid drive at about 600 RPM (20mph) and the cycle continues (600-1600-600-1600) until the incline is crested.

The other gear shift points are at 2200 RPMs which is perfect for the 671s torque curve. Is there some way I can adjust manually that fluid drive 1st shift so it occurs inside the engines power range?

I have asked every transmisson shop and diesel mechanic locally here and no one has been able to shed any light on this. - Thanks for your time, Chuck
Re: Allison VS2 Transmission ? Ernie Booe 7-20-10  
Did you get your shift problem fixed?
Your diff ratio might be to high...

Check with Complete Coach Works in Riverside...They maybe able to help find a rear end for you.
Phone 951-684 9585.

My number is 949 933 9598
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