Re: 2 speed differential -- Buzzy's Question and Answer Forum

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Subject: Re: 2 speed differential

Author:
Gary Sprague

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Date Posted: 10/ 14/ 04, 10:49pm
In reply to: Grant Thacker 's message, "2 speed differential" on 10/ 2/ 04, 10:25am

Hello Grant .... I understand the need for a SERIOUS road gear to allow maximum life from our over-revved Diesels. I have a fresh 3208 Cat and feel it'll be short-lived if I continue cruising at 3000rpm and 69mph. I'm running a 5;29 and recently picked-up a freshly rebuilt Rockwell 2-speed with a 4.11 tag beside the air shifter. My Allison transmission is a MT643 4 speed and lock-up torque converter. I bought a service manual from Allison and it mentions the procedure when using a 2speed rear gear, so its OK with the company. With my 4.11 also comes a 5.61 so I'm actually getting just what I' d been hoping for. I'm in contact with 1 other board member that has also done this very swap! Complete axle assembly -- I'm just about ready to start on mine. If I can help let me know. I want to cruise at somewhere between 1800 and 2500rpm and I'm almost certain these motors will never wear out!!! Thanks for listening Gary in Waldo - Fl

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[> [> Subject: Re: 2 speed differential
Author: Lucas Willemse [ Edit \| View ]	Date Posted: 10/ 15/ 04, 1:02pm I just replaced the Cat 3208 NA in our 1980 FC35 with an fresh rebuild Cat 3208 250 Turbo. The change in driving is unbelievable, it almost drives like a car. I now need to address the rear end, 5.29 is to low. I am looking for a 4.65 or so but may look into a 2-speed, where did you find the 2-speed? [ Post a Reply to This Message ]