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  1. October 6th, 2020, 02:24 PM #1
    Taisho
    Taisho is offline New Recruit
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    Default Powertrain questions

    I can't figure out why my M715 only goes 25 mph.
    Front axle- stock Dana 60.
    Rear axle- stock Dana 70.
    Engine- Rebuilt 454.
    Tranny- Rebuilt SM465.
    Transfer- stock NP200.
    I've checked and double checked that the transfer is in High gear.
    Last edited by Taisho; October 7th, 2020 at 07:03 AM.
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  2. October 6th, 2020, 05:54 PM #2
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    kwai
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    did you shift into 3rd gear? Just a thought.

    slipping clutch? Have you checked RPM vs speed?
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  3. October 7th, 2020, 07:00 AM #3
    Taisho
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    Thanks Kwai. Yes, shifts into 3rd gear no problem. I did not suspect or detect any clutch slippage, but I'll double check the adjustment. As far as rpm's I'll install a tach.
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  4. October 7th, 2020, 09:49 AM #4
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    Barrman
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    Is the engine struggling to get that fast or revving freely? My first thought was you are in low range on the transfer case.
    Remember if you didn't build it you can't call it yours.

    6.2 powered M715, 5 M1009's, M416, 2 M101's, 2 M105's, 3 M35's, M1007 6.5 turbo Suburban project called Cowdog.

    https://www.youtube.com/channel/UCCz...HGkBCfhXZ5iuaw
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  5. October 7th, 2020, 03:20 PM #5
    Taisho
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    I can get to 25 mph very quickly. I dont detect any clutch slipping. Again I will check to ensure in in high gear.
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  6. October 7th, 2020, 03:24 PM #6
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    kwai
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    how are you checking that the t-case is in high range?
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