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#1
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Th400 speedo gears
What is a good source for speedo gears? Most of my search results come up with TCI. I will need the drive gear, driven gear and the housing. Does GM still make these?
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#2
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I grabbed mine off a trans parts supplier on eBay. TCI is a solid source.
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Ken '68 GTO - 464 - Ram Air II heads - 236/242 roller - 9.5” TSP converter - Moser 3.55 Truetrac (build thread | walk around) '95 Comp T/A #6 M6 - bone stock (pics) |
#3
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https://transmissioncenter.net
The later TH400 uses a pressed on steel drive gear. It requires a special tool to remove. I made my own tool. I used a little bit of heat, not a lot as I didn't want to affect the output shaft. The tool ended up seriously deformed and the gear did not come off. I was going to pay a shop to swap gears. At the labour rates and time involved I will just put on a gear ratio adapter.
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Frank M. 75 Firebird 68 Firebird 400 RAIII 66 Chevy II 461 Pontiac in AZ |
#4
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Mine does have the plastic gear.
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The Following User Says Thank You to max 93 For This Useful Post: | ||
#5
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are all th400 housings the same size? i would make sure before ordering.
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#6
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Quote:
I don't remember exactly when that change was made but know the older stuff tends to take the larger diameter. |
#7
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I haven’t seen anything about different diameter housings for the th400, just different housings based on what speedo gear you are using. I have seen them for the th350
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#8
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I have some of them here. One Mic's just under 2 inches. In the 1.90's if I remember right, and the other is just over 2 inches.
There isn't a big difference and hard to tell with the naked eye but it becomes apparent if you try to change 0-rings and have one for the other, lol. |
#9
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Summit is where I bought mine.
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Frank M. 75 Firebird 68 Firebird 400 RAIII 66 Chevy II 461 Pontiac in AZ |
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