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Old May 8th, 2017, 05:36 AM
401bluebird 401bluebird is offline
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Join Date: Oct 2016
Location: Ojai California
Truck: 1960 GMC chassis 401 V6 Bluebird coach
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Default Re: RT 910 10 speed retrofit from 5 spd

Hello again- I found some new info in my search for RT 910 10-speed transmissions. Seems that the 10th gear is 1:1 direct for the RT 910. The RTO 910 however has a 1:1 9th gear and a 0.81:1 overdrive 10th gear. However, it was mentioned that the RTO-910 used a bigger bell housing size, an SAE 3 (Instead of SAE 2 as my Bluebird coach uses.

So I found a bus conversion site where one respondent suggested a Road Ranger RT 9509, a 9-speed trans with similar torque rating as an RT 910 and an SAE 2 bell housing size. This trans has a deeper 1st gear, plus a taller overdrive, 0.79:1 in 9th gear. Though this trans has broader spreads in each gear change, this has to be a huge improvement over my 5-speed Clark transmission.

I will go to some Truck Centers this week to see what is out there. I am hoping that my 401 V6 likes the change! Regards, -Andy Carlson
Ojai CA
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