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Thread: R154 Gurus needed!

  1. #1
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    Default R154 Gurus needed!

    I recently purchased all of the Marlin Crawler upgraded parts along with the Driftmotion 3-4 shift fork and a rebuild kit from suprastore.com.

    I had a local shop rebuild the transmission and drove it for no more than 100 miles until a problem arose. I heard a loud squeal in 2nd gear and then in 3rd gear. When I came to a stop and tried to take off in 1st gear, the transmission made a loud grinding noise and kicked it out of gear. I was close to home and was able to limp it home in 2nd-4th gear, but there was a loud grinding noise while rolling in all of those gears as well. It didn't grind going into gear, just while it was in gear.

    I took the transmission back to the shop and they told me that the Marlin Crawler 1st-2nd gear shift fork was too large and not made properly....which I find very, very hard to believe. They said that it was because the shift fork was too wide and it rubbed against 2nd gear, causing a lot of aluminum metal shavings to build up on the gears - which according to them is what caused my issue with the transmission kicking out of 1st gear and grinding in the other gears. They kept telling me that the transmission is "over shifting" second gear.

    They said there's no chance that anything else can be wrong with the transmission and there's nothing that can be adjusted or installed incorrectly that would cause this and it is definitely the shift fork....I find this hard to believe because I have another R154 that has the IDENTICAL problem as the one they rebuilt but this one is 100% factory. I had removed the cases myself to find ZERO metal shavings in it although it was doing the same exact thing as the one I had them rebuild.

    My question is what could be causing this problem? I find it odd that it happened to my stock one and then to a freshly rebuilt one with less than 100 miles on it.

    Attached is a picture of the Marlin Crawler 1-2 shift fork and you can see where it has rubbed against 2nd gear.

    Thanks in advance for any input and sorry if there is a blatantly obvious answer to this, transmissions are not my thing.
    Attached Images Attached Images

  2. #2
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    Default Re: R154 Gurus needed!

    Additionally, I was dogging the daylights out of my OEM transmission when this problem occurred but I hadn't started "banging" gears yet in the new one when it happened. I was shifting a bit harder than normal but nowhere near what I was doing with the stock one. Also, I have been using a stock shifter in both of these transmissions which came out of my old 87 supra that I dogged every time I drove the car and launched at 6500 rpm on slicks at the track numerous times and banged the hell out of every gear and never had any problems. It does have the Marlin Crawler shift bushings which is the only non-factory part about the shifter.

    Thanks again.

  3. #3
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    Default Re: R154 Gurus needed!

    Absolutely not.


    I just built one myself as didn't have a single issue.... The fork slides inside the selector so I don't see how it can rub anything...
    [SIZE=1]'91 Supra Hard Top - Building 700rwhp 1J -Achieved-
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  4. #4
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    Default Re: R154 Gurus needed!

    i know its freaking old but anyone else had this issues i have now exact the same...

  5. #5
    Dang Dude! No Way Man.
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    Default Re: R154 Gurus needed!

    Who rebuilt it?

  6. #6
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    Default Re: R154 Gurus needed!

    a trans shop who did it a thousand times.....
    u cant set or do anything wrong there or ?

  7. #7
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    Default Re: R154 Gurus needed!

    As far as what?

    The forks shouldn't touch any sort of gearing. If it does something is wrong. The Marlin crawler pieces and dm pieces are all well built and good.

  8. #8
    1UZFE SWAP DUDE!!!

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    Default Re: R154 Gurus needed!

    yup, they're amazing.

  9. #9
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    Default Re: R154 Gurus needed!

    Never once had an issue with any of the "built" parts from DM or marlin. Ive built a couple myself, and have had many built r154's in and out of here.

    is this a supra shop or something else?

  10. #10
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    Default Re: R154 Gurus needed!

    Wow mine just did something very similar. 500km on rebuilt by a trans shop. Broke the thrust washer in two also.
    Getting old is mandatory, growing up isn't. --- Boostin Since 10/28/08
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