Speedometer Driven Gear help. - The 1947 - Present Chevrolet & GMC Truck Message Board Network

skokie · 11-29-2004, 05:20 PM

If anyone has a stock 307 rear end with a 400 turbo tranny, do you know which tooth count speedo gear and tooth count drive gear that you have in the tranny? The color of the gears will tell me. Reason I am asking is that I am having a helluva time getting the right one and the tranny shops around here are not very helpful.

Thanks

Robert1970C20rstbukt · 11-29-2004, 05:39 PM

Go here and type in your tire size (Ex. 31" tall) and your rear end gears and bam, it tells you which driven and drive gears you need.

http://www.700r4.com/speedoCalc/speedocalc.shtml

skokie · 11-29-2004, 05:49 PM

Thats exactly what I needed this morning. Tranny guy called and said that there is a 17 tooth in there now and he is getting a different sleeve and a 32 tooth to go in it which will fix the problem. Thanks again Robert

86 Red_Bowtie · 11-29-2004, 06:13 PM

Go to the GM dealer and have them dig out one of the parts books for an early to mid 80s truck. They need to go to the transmission section. There is about two whole pages that give all of the gear ratios (drive and driven gears) and the colors of the gears for just about all tranny setups and rear end gear ratios. Have the dealer copy the pages, and enjoy.

Robert1970C20rstbukt · 11-29-2004, 07:45 PM

No problem. The Chevy dealer should have any of the gears you need in stock.

11-29-2004, 05:20 PM	#1
skokie Registered User Join Date: Oct 2003 Location: San Jose Ca. Posts: 3,354	Speedometer Driven Gear help. If anyone has a stock 307 rear end with a 400 turbo tranny, do you know which tooth count speedo gear and tooth count drive gear that you have in the tranny? The color of the gears will tell me. Reason I am asking is that I am having a helluva time getting the right one and the tranny shops around here are not very helpful. Thanks __________________ RIP to my son Dylan. 5/17/2002 - 8/18/2018 If you want to know more about rare forms of pediatric cancer or if you want to help fund pediatric cancer research, please check out the website for the non-profit I started. https://slothforpedcancer.org 68 build thread http://67-72chevytrucks.com/vboard/s...d.php?t=223234

11-29-2004, 05:39 PM	#2
Robert1970C20rstbukt Registered User Join Date: Jun 2004 Location: Beeville, Texas Posts: 1,943	Go here and type in your tire size (Ex. 31" tall) and your rear end gears and bam, it tells you which driven and drive gears you need. http://www.700r4.com/speedoCalc/speedocalc.shtml __________________ RJD 1984 Chevrolet C30 welding truck 454/SM465 1977 GMC C15 pickup 350/TH350 1970 Chevrolet C20 pickup 350/TH400 1970 Chevrolet K20 Suburban 454/TH350 1969 GMC 8500 478M V6/5 spd winch truck

11-29-2004, 05:49 PM	#3
skokie Registered User Join Date: Oct 2003 Location: San Jose Ca. Posts: 3,354	Thats exactly what I needed this morning. Tranny guy called and said that there is a 17 tooth in there now and he is getting a different sleeve and a 32 tooth to go in it which will fix the problem. Thanks again Robert __________________ RIP to my son Dylan. 5/17/2002 - 8/18/2018 If you want to know more about rare forms of pediatric cancer or if you want to help fund pediatric cancer research, please check out the website for the non-profit I started. https://slothforpedcancer.org 68 build thread http://67-72chevytrucks.com/vboard/s...d.php?t=223234

11-29-2004, 06:13 PM	#4
86 Red_Bowtie Registered User Join Date: Nov 2003 Location: South Wichita,KS Posts: 698	Go to the GM dealer and have them dig out one of the parts books for an early to mid 80s truck. They need to go to the transmission section. There is about two whole pages that give all of the gear ratios (drive and driven gears) and the colors of the gears for just about all tranny setups and rear end gear ratios. Have the dealer copy the pages, and enjoy. __________________ Sean Midwest All Truck Nationals, Riverside, MO - 2008 - 2015

11-29-2004, 07:45 PM	#5
Robert1970C20rstbukt Registered User Join Date: Jun 2004 Location: Beeville, Texas Posts: 1,943	No problem. The Chevy dealer should have any of the gears you need in stock. __________________ RJD 1984 Chevrolet C30 welding truck 454/SM465 1977 GMC C15 pickup 350/TH350 1970 Chevrolet C20 pickup 350/TH400 1970 Chevrolet K20 Suburban 454/TH350 1969 GMC 8500 478M V6/5 spd winch truck

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