JJ62 Posted October 19, 2019 Share Posted October 19, 2019 (edited) This should be an easy question for you veterans. Trying to check my diff. fluid level. Neither a 3/8" or 1/2" ratchet will work on the plug. Measures 7/16 with my caliper. Wondering if I need to buy a special tool and if anyone knows WHY I have to buy a special tool. Usually they are standard ratchet size or a hex. Thanks, Jim Edited October 19, 2019 by JJ62 (see edit history) Link to comment Share on other sites More sharing options...
TexRiv_63 Posted October 19, 2019 Share Posted October 19, 2019 If I remember right mine came out fine with a 3/8 ratchet or extension, take a close look and see if your plug has been damaged. Link to comment Share on other sites More sharing options...
JJ62 Posted October 21, 2019 Author Share Posted October 21, 2019 The plug hole looks pretty square, not like it's damaged. I ended up grinding down an old 1/2" extension to 7/16" and it worked pretty slick. Not sure why it has that odd size, but problem solved! 1 Link to comment Share on other sites More sharing options...
telriv Posted October 21, 2019 Share Posted October 21, 2019 Looking at the pic it doesn't appear to be the correct plug. 1 Link to comment Share on other sites More sharing options...
awk409ak Posted October 22, 2019 Share Posted October 22, 2019 (edited) Here's mine. It's a raised square, but it's also a 64 Art Edited October 22, 2019 by awk409ak (see edit history) Link to comment Share on other sites More sharing options...
telriv Posted October 22, 2019 Share Posted October 22, 2019 Looking closer at the plug & making the pic. bigger I now have to eat crow, BECAUSE it is the CORRECT plug for a non posi rear. That hole in the center should be a 3/8ths. square drive as in an extension. Try hammering it into place & see what happens. Rust will make things seem smaller. The pic shown is a a posi plug which is the easiest way to tell posi from non posi because they were ALL like this. Tom T. 1 Link to comment Share on other sites More sharing options...
JJ62 Posted October 22, 2019 Author Share Posted October 22, 2019 7 hours ago, awk409ak said: Here's mine. It's a raised square, but it's also a 64 Art You've got an outie, as opposed to my innie! I also see there's an I.D. tag there. I wonder if they are normally on the drain plug - seems easier to be discarded that way. On Fords they are on the differential bolts. I'll have to check on my '65 Riviera and see what that has on it. Link to comment Share on other sites More sharing options...
RivNut Posted October 22, 2019 Share Posted October 22, 2019 Read Tom's post about posi and non-posi plugs. The tag is the tag found on posi units that reminds you to add the posi additive when changing fluids. Link to comment Share on other sites More sharing options...
awk409ak Posted October 22, 2019 Share Posted October 22, 2019 JJ62, Well in the 64 Buick Chassis Manual, page 6-20 it shows it and states that the posi id tag is around the filler plug. Art Link to comment Share on other sites More sharing options...
RivNut Posted October 23, 2019 Share Posted October 23, 2019 1 hour ago, awk409ak said: JJ62, Well in the 64 Buick Chassis Manual, page 6-20 it shows it and states that the posi id tag is around the filler plug. Art Just like in the posted picture by Art. I imagine that a lot of tags were not reinstalled when fluid levels were checked. Link to comment Share on other sites More sharing options...
jsgun Posted October 23, 2019 Share Posted October 23, 2019 I happened to check mine last weekend, it was a very tight fit also. Link to comment Share on other sites More sharing options...
telriv Posted October 23, 2019 Share Posted October 23, 2019 That tag is ALSO the sealing washer. I'm looking for a fill plug for a Posi IF someone happens to have one laying around they would be willing to part with. Tom T. Link to comment Share on other sites More sharing options...
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