T-400 speedo gear/housing - Hot Rod Forum : Hotrodders Bulletin Board
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Old 03-31-2009, 01:26 PM
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T-400 speedo gear/housing

I have two gears for my th400 speedo. (driven gear) One of them doesn't mate up with the drive gear in the tranny (too small diameter) and the other one which is the right diameter doesn't fit into the housing as the shaft diameter is too large. Can the shaft be sanded down and/or can the housing be bored out to make this work? I've checked charts but the pics and colors aren't matching exactly what I have. Thanks.

Barry
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Old 03-31-2009, 04:29 PM
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Quote:
Originally Posted by cornfieldcars
I have two gears for my th400 speedo. (driven gear) One of them doesn't mate up with the drive gear in the tranny (too small diameter) and the other one which is the right diameter doesn't fit into the housing as the shaft diameter is too large. Can the shaft be sanded down and/or can the housing be bored out to make this work? I've checked charts but the pics and colors aren't matching exactly what I have. Thanks.

Barry
There are 2 different size gears and 2 different size housings. Using the correct parts is easier. Here's some gear & housing part Info.>>

http://novaresource.org/speedo.htm
http://www.tciauto.com/Products/Tech...eedo_gears.asp
http://www.tciauto.com/Products/comp...eter_gears.asp
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Old 04-01-2009, 05:05 AM
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Thanks for the reply. I've been to the TCI site, the other one kind of contradicts TCI's. Of course getting the right parts is the best way to go...no brainer, but that wasn't my question. I was just curious if it would weaken the parts to the point of making them fail under normal circumstances.
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Old 04-02-2009, 12:38 AM
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Trying to make the speedo work will eventually backfire on you. Even it you sand it down and get it to "fit", it still will not be the correct gear. The diameter could be a hair off or the pitch of the teeth may be slightly off or the shape of the teeth may be incorrect. All of those differences are usually so subtle that you cannot see nor measure them. When the incorrect driven gear is used, it usually is not long before you are replacing BOTH the drive and the driven gears.

Best policy is to make sure that 1) you have the correct gear and 2) that you have the correct housing for that gear.
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Old 04-02-2009, 04:53 AM
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I appreciate the replies. Like I said before, I know new parts should be used, I was just curious really if anyone had attempted to do that sort of thing. I am looking at TCI's website for a new housing and driven gear, but in the back of my mind I just have to wonder......

Barry
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