What color speedo gear???

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TURNA

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Any idea what color speedo gear has 28 teeth?

Yellow?

Thanks
 

69hurstolds

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Haha. Reminds me of a joke---

What has eight legs and 6 teeth?

The night shift at a West Virginia Waffle House.
 
  • Haha
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69hurstolds

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What transmission? I'm assuming 4 speed MW9?

Edit: Need more info. Rear gear, tire size? There's two part numbers in 1984 that are yellow with 28 teeth and 1 part number for 1986 with 28 teeth, also yellow....
 
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TURNA

Rocket Powered Basset Hound
Jul 24, 2009
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Socialist NY
th200c
3:42 rear 27 inch tall tire
 

69hurstolds

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For 1986 there's a B, yellow, 28 tooth. P/N 25524921. Goes with the green 10 tooth code E drive gear for 3.73. Standard in 442.
 

69hurstolds

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Oh, snap. I keep defaulting to MW9. Sorry. I'm so used to the 200-4R.

Lemme look....
 

TURNA

Rocket Powered Basset Hound
Jul 24, 2009
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Socialist NY
I have 3:42's not 3:73's
 

69hurstolds

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This sucks. I completely still went 4R. I can't take my eyes off of the MW9...

Ok, I think I have this figured out. What color/teeth count is your drive gear? Please TELL ME IT'S RED with 17 teeth!!!!!

If it is, you can get the purple gear with 43 teeth. GM p/n 1362196. Housing for the driven gear if you need it is GM p/n 25512339. Housing also fits TH350 and 7004R and is normally cast with the driven gear teeth numbers it can handle.

You are looking for gearing for 3.42 with 27" tires.

Speedo drive/driven gear calculator below. GM modern speedos use 1000 revs/mile @60mph of the speedometer cable.

http://www.bgsoflex.com/speedo1.html

Plug in 17 (red drive gear) and you get 43 teeth. = PURPLE with 43 teeth.

19 with the yellow drive gear and you need 49 teeth. Which ain't happening. Not without some sort of adapter gear.

Again, I make no promises on anything I try to do in order to help. It's free advice, but I'm limited in manuals and information.
 

TURNA

Rocket Powered Basset Hound
Jul 24, 2009
10,941
19,992
113
Socialist NY
Thank you!
 
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