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Thread: What are the Trans & Diff drain & fill plug Thread sizes?

  1. #1
    2,000 rpm - light wheelspin, no bog here!
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    What are the Trans & Diff drain & fill plug Thread sizes?

    For some crazy reason I can't find the answer to my questions. It's like asking someone to borrow their car and they say "NO, my chainsaw is broken!" I think I got the answer to the drain plug for the manual trans as M14X1.50 but not the fill size and I can't find either for the Rear Diff. I ask google and get oil pan answers. I put in manual transmission and get auto transmission answers. I'm a detail kind of guy and I want to buy RED Anodized plugs for the fill plugs and Magnetized Red Anodized plugs for the drain plugs. To do so I need the size of the threads. I don't want the president of the united states personal phone number, just the thread size. I don't care about what size the head of the bolt is either (I get that answer too), JUST THE THREAD SIZE. Could someone kindly answer the Big Secret Question...PLEASE?
    Last edited by CLZinn2; 03-11-2020 at 11:04 AM.

  2. #2
    6,000 rpm - mere mortals would shift HarryB's Avatar
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    Engine and manual trans drain are the same AFAIK. Need to look up the rest.

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    CLZinn2 (03-12-2020),tsingson (03-12-2020)

  4. #3
    6,000 rpm - mere mortals would shift HarryB's Avatar
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    So...Diff fill and drain plug have the same thread size. Gearbox drain and diff drain are also the same according to this (https://www.mx5parts.co.uk/gearbox-d...-25-p-846.html)

    Therefore, both diff plugs and gearbox drain plug should be M14X1.50

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    CLZinn2 (03-12-2020),tsingson (03-12-2020)

  6. #4
    2,000 rpm - light wheelspin, no bog here!
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    Thank You Harry, So Very Much for your Simple Straight Forward Answer!!! So many times people ask questions why and want to give their opinion on how I should build MY car. I gets annoying. GOD BLESS

  7. #5
    6,000 rpm - mere mortals would shift HarryB's Avatar
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    Just re-read my post; what I meant was the 2 diff plugs plus the gearbox drain plug. Not sure what the gearbox fill plug is, and my spare gearbox is stored in a rather remote storage unit to check. This is for NB2 parts, but it should reasonably be the same for 1.8 NAs and NBs

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    CLZinn2 (03-15-2020)

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