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Clark 280VO

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  • #16
    Eaton fuller conversion

    Noticed your looking to install RT6609 in your truck.If this has been done or not I would like to say a few words on this project.It can be done with some fabrication on the transmissions rear support, body lift to clear the SAE #2 housing, on board compressor for the minimum of 68 psi needed for shift range.And last but not least the drive shaft, you will need a slip yoke with same size of monster "U" joint to machine on to your existing drive shaft.The SAE #2 housing you can get at a good truck salvage. The flywheel you will need 14 inch or SAE #2 ,again a good truck salavge will have one or better a new one.Starter you will need a matching one to the flywheel housing.All these parts are common, I did not write down part numbers as I did my conversion but you should not run into any problems locating them.For clutch release I used the exsisting parts that came on the RT 6613 clutch housing which is a push type.Clutch usage is where I had a bit problem.I started with a 14 inch heavy duty paddle type, after 60k miles I pulled the tranny due to a leak. Then I decided to go with a double disk (OUCH!) I had to step up to the 1-3/4 input shaft,shaft housing,bigger release bearing and adapter ring kit for the dual clutch.With that said if you can stick with the single type go that way.As for the transmission I converted from RT to RTO because the engine revs were to high and also regeared to a 3.42 final drive.Weight wise yours weighs 373lbs.The 6613 I used weighs 554lbs less controls,now I did change the front springs on my 1 ton chevy to P30 van springs.All work was done by me if not I would still be paying for it, besides thats part of the fun saying " I DID THIS".As for shifting clutchless, just like the big rigs with straight 4 inch exhaust and dual 72 inch chrome stacks not to mention the attenion you will get.Now I would like to figure a way for a single stage compression brake not exhaust one.
    Martin

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    • #17
      This is a really enjoyable thread. Know it's old. I just purchased a 280vo core that I plan on going though and putting in one of my projects probably behind a Deutz F5L 912, or, if I can find a Dakota my F4L 912. I'll use the Deutz adaptor to the SAE 2 bell housing. Or, I could use it behind my 4bt if I ever find a good truck for it.

      Here's the question: my tranny came without a shifter and is in unknown condition. Will shifters from similar models fit? Do I have to use any hard replacement components from the same case #230790 to work on this 280vo? I could just change the overdrive components to another case if I knew which cases I can use - have about 6 available. I have one in an old GMC that has the 230790 case, but the shifter feels sloppy and worn. Also can get a couple of 282 and 285 v's I don't think the 230790 is a vo. One 285 is in an old fuel truck that has low miles and the tranny feels nice when shifting. I'd love to use that one and convert to od.

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