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Bob Brewer's Cummins 6AT writup in his FJ55 Created March 25, 2003 Bob Brewer email me these comments after he installed a Cummins 6AT into his FJ55. He wrote this and with permission I have posted it. His email address is also at the bottom if you have any questions you wish to ask of him directly.... I have just seen your web site pictures of the 6at installed in Royals FJ55. I have done the same conversion with minor variations and it has worked out well. The 55 belongs to my nephew Peter Amstutz and currently lives in San Pedro, Ca. where it is used as a daily driver and commute vehicle. It has been tested off-road and has amazing power and torque. We installed a three inch body lift so that the engine could be mounted high enough to clear the front drive shaft as well as the Scout power steering box. The 6at came with a GM bell housing which made the conversion much easier since the 55 had previously been converted to a 292 Chevy six retaining the stock Toyota 4-speed. It wants an overdrive gear. A lower first would be nice too. Maybe there's a Land Cruiser 5 speed in its future. It's still smooth and gutsy at over 3000 rpm, however, and gets well over 20 mpg. There were a few snags. First, the Scout power steering box is mounted on top of the frame and wouldn't clear the pump that came mounted on the engine. This resulted in the body lift and high mount of the engine. Actually, this helped a lot with front driveshaft clearance. The pump turned out to be perfectly compatible with the box. Second, the fit is very tight front to back. Since we wanted to keep the stock fan blade and clutch, the clearance at the firewall is about 1/2 inch. The fan-to-radiator spacing is just right. Third, since diesels don't produce manifold vacuum, we had to use an alternator with a vacuum pump attached in order to get the brakes to work. This pump requires pressurized oil feed and return lines like a turbo. (See this page (a new window will open) about possible vaccuum ideas for conversions) The inlet was no problem but the return ended up being plumbed through the valve cover cap. Fourth, the radiator. The ports had to be reversed. The bottom one at least. I had one from a FJ60 that was already recored and changed over because that was the original vehicle being considered. But still an additional $300. If I was to do it again, I would adapt the stock FJ55 radiator instead. With the installation of a boost gauge and an inductive tach, heavy duty battery, new glow plugs, racor fuel filter, and some custom cables, the installation was complete. All we need now is the five speed and a new set of doors. Bob Brewer
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