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Old 03-10-2011, 06:18 AM
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T-400 with no speedo capabilities

I see buy reading some of the posts on the th400 speedo blanking plug should in theory just knock out!! hmmm, my 400 came out of a amc fsj so was fitted with the plug or what looks like a plug but not in the tail case but as part of the tranny case, but when trying to knock out the plug gave up before i actually smashed the gearbox case to pieces it seems thar on my tranny that the plug is actually a cast part of the trans case and not a plug if i take the tail case of and put my fingers in behind the plug it does not feel like a core plug or some thing simillar need to get my head right in there for sure to see if its moulded part of the case but all i know is it is a tight fit anybody come across this??

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Old 03-10-2011, 05:34 PM
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On some cases GM did not machine the speed-O area open.

Some were machined and plugged at a later date I guess.

GM may have not installed the core plug, perhaps a shop did on some replacement cases
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Old 03-18-2011, 05:18 AM
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Trans plug.

Some Oldsmobile T400's had the speedo hole plugged, they drove the speedo off the front wheel via cable' somewhat simular to early VW speedo cable drives. So I know they did build these that did not have a speedo hole. They did install 400's in many Jeep vehicles, I assume your AMC is a Jeep. They might have driven the speedo off the transfer case?
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Old 03-18-2011, 07:40 AM
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FSJ = Full Size Jeep

Damn TLA's (three letter acronyms) LOL

When you say smashed the case...you mean totally destroyed it or just chipped it up a bit?
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Old 09-16-2011, 09:31 AM
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sorry it has taken so long to reply, i tried knocking what looked like a plug out but after a little research and your answers realised that the plug was moulded to the trans casing after a couple of sturdy clouts with a punch i realised the hole would need machining to open up the speedo drive so i actually did not persevere any further with the said 2lb persuader lol so thankfully no chips or cracked case.
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