Hey guys, I'm sure the speedo of my 70 is off going from a 6 cylinder 3 on the tree freeway geared 10 bolt to a small block th350 and a 373 12 bolt. can you guys tell me what gear i need for my tranny just from my cars specs? it would really help me out, the car i currently not running so i have so base readings on how much its off, but here is my combo

th350
373's with 28 inch tall tires
autometer speedo


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Tom
1966 Super Sport (http://chevelles.com/showroom/myss.jpg) Now striped frame off Project
1967 Malibu (http://chevelles.com/showroom/hot66ss4) Getting there.
1969 El camino Beater FOR SALE MUST SELL FIRST $3,500 TAKES IT...SOLD SOLD SOLD (http://members.aol.com/chvellss/elco.htm) Mild 355, M20 4 speed
1970 Hugger Orange elco (http://members.aol.com/chvellss//newelco.jpg) 350/350 soon to be semi daily driver. $1,700 special
1997 Dodge ram FOR SALE
2002 Silverado LT ext cab (runs 15.2's) daily driver

Team Chevelle member #262

15 tooth drive gear and a 40 tooth driven gear.


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Rob Mirabile TC #1079, ACES #4387
"If You Don't Drive It-Sell It"

The Ride (http://www.chevelles.com/showroom/onabudgeta1.jpg)
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67 Malibu Conv (always under construction)
64 Lemans Conv, Building for my brother-in-law

[This message has been edited by onabudget (edited 09-02-2002).]

try this TC technical link:
http://www.chevelles.com/shop/speedo.html

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Gregg Haskin
72 Chevelle SS
ZZ502 Crated RAT
Muncie M-20 4 speed
TEAM CHEVELLE #726 ACES #4486
"PROUD TO BE AN AMERICAN!"
“What the heck are all these extra nuts & bolts for?”

My 72 Chevelle SS Restoration Website: www.72ChevelleSS.com (http://www.72ChevelleSS.com)

Mine has been off for years. I looked at the tech article, but I have a question. How do you change these gears?

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my 67 droptop (http://www.mdesignstudio.com/chad/other/mychevelle2.jpg)

Interior (http://www.mdesignstudio.com/chad/other/interior.jpg)

big block (http://www.mdesignstudio.com/chad/other/motor.jpg)
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Dad's 67 droptop (http://www.mdesignstudio.com/chad/other/dads67.jpg)

Chad,
changing the driven gear is simple...

For the Muncie/TH350 and Powerglide, you just disconnect the cable, unbolt the retainer from the trans (1 bolt) and slide the sleeve out of the trans... The new gear just slides into the sleeve (old one slides out first), and slide the sleeve back in, reinstall the retainer and cable, and away you go...

Even on your back, this is about a 2-3 minute job...

If you need to change the drive gear, well, then thats a problem... I think you have to remove the tranny for that (Must remove rear extention housing)...

For a TH400 and others, I think it probably similar, but I have never done a swap with those...

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"Once you go RAT, you never go back..."
TC #1366
Tony
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So if I look up the gear I need, can I get that at Napa do you think?

If it's that much trouble to change the drive gear, is there a way on that chart to get the proper driven gear for my drive gear?

Chad,
What tranny??

Sorry, TH400.

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my 67 droptop (http://www.mdesignstudio.com/chad/other/mychevelle2.jpg)

Interior (http://www.mdesignstudio.com/chad/other/interior.jpg)

big block (http://www.mdesignstudio.com/chad/other/motor.jpg)
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Dad's 67 droptop (http://www.mdesignstudio.com/chad/other/dads67.jpg)

Sorry Chad, never did a th400 but as Tony said above its probably simmilar.

I guess NAPA could get you the parts, but I think they will have to order from GM anyway, and probably alot easier to go to GM yourself with the part numbers you need...