Transmissions and DrivetrainNeed help with your trans? Problems with your axle?
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First, the drive gears: 15 tooth is gray, current GM part number is 8642620. there is no 16 tooth. 17 tooth is red, 8640517. 18 tooth is blue, 8640518. 19 tooth is yellow, part number not available to me at this time. Now, driven gears. First, these now come with a new plastic carrier, so you don't need to hunt up an old aluminum one. Second, there are 2 styles. Most pre-89 cars with cable speedometers use the 7-digit part numbers, while a few pre-89s through '92 will use the style with the 8 digit part number. Beware that both 34 tooth and 42 tooth are both green. so:
34 tooth green, 9774413/25513041.
35 tooth orange, 9780387/25513042.
36 tooth white, 1359270/25513043.
37 tooth red, 1359271/25513044.
38 tooth blue, 1359272/25513045.
39 tooth brown, 1359273/25513046.
40 tooth black, 1362048/25513047.
41 tooth yellow, 1362195/25513048.
42 tooth green, 1362049/25513049.
43 tooth purple, 1362196/25513050.
44 tooth dark gray, 9780470/25513051.
45 tooth light blue, 9775187/25513052.
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Last edited by Kevin91Z; 06-02-2009 at 02:24 AM.
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I agree with JamesC. It would be nice to know the right combo of speedo gears, with what gears, and tire sizes that are common on our cars. Mine has been changed from 2.73 to 3.42. Still have stock sized tires, 235-55-16. Anybody have a chart of some kind, so lazy guys like me dont have to do the math!?? Ha! Ha!
You guys don't understand several things I expected everyone to. One, you're not supposed to post in a sticky before the moderator can make it a sticky and close it. I've already discussed with the moderator making these 2 posts into stickies. Secondly, to make an all-comprehensive table or graph, with every accurate combination and every popular, nearly-accurate combination, would take 74 pages. The math is simple, I can do any combo in less than 30 seconds, therefore, there's no excuse for anyone else failing to do so. That's why I just made 2 new Sticky posts. If you find you cannot figure it out for yourself, PM me.
Sorry to post in your soon-to-be sticky, but I made a spreadsheet a while back that has these part numbers along with a calculator to find out which ones you need.
I've attached it to this post.
Attila - If you're so inclined, you can spice this up with the missing part numbers, and maybe color it a bit nicer, and repost it in your thread if you want.
Nobody likes to do Math Also my spreadsheet has a nice RPM vs speed chart based on tire size and gearing. Very useful.
You guys don't understand several things I expected everyone to. One, you're not supposed to post in a sticky before the moderator can make it a sticky and close it.
After several stickies of my own, I'm surprised to hear this. Live and learn. BTW, none of mine have ever been closed.
At any rate, the info you provide will be extremely useful to members--a sticky was long overdue, so thank you for your contribution. The following company furnishes drive and/or driven gears for the 700R4 as well as other pertinent info:
holy crap guy, you're taking it to 4 decimal places?!? Sheesh! I'm at work now, if somebody else wants to add those additional cells feel free. Preferably someone who understands excel math functions and won't butcher anything.
Basically I just have the choices listed, and you fill in what you have. If we want, we could use drop down boxes to choose. If nobody jumps in and does the work for me, I might be able to tweak this tonight, or tomorrow.
alright whats the formula to do it on a calculator? running a 3.23 gear and 70 series tires. just let me know the formula so i can figure it out myslef and never have to ask ever again.
__________________ 358 block, rpm perofrmer heads, rpm air gap intake, comp cam 275 (maybe), 1.6 comp silver lifters, edelbrock 600 carb, mallory dizzy, 150 shot NOS, rebuilt 350 turbo, B&M megashifter, 3.23 gears and more looking to be in by january. shooting for 400-450 hp without NOS. tired of seeing that antifreeze green mustang trying to be a badass around town.
didnt see it yet. ill go check it out. i just clicked "new posts" i didnt actually go into the "transmission and drivetrain" section. my bad.
__________________ 358 block, rpm perofrmer heads, rpm air gap intake, comp cam 275 (maybe), 1.6 comp silver lifters, edelbrock 600 carb, mallory dizzy, 150 shot NOS, rebuilt 350 turbo, B&M megashifter, 3.23 gears and more looking to be in by january. shooting for 400-450 hp without NOS. tired of seeing that antifreeze green mustang trying to be a badass around town.
Can anyone Tell me If a Transmission out of a 1991 Camaro Rally Sport will work in My 1984 Z28 HO?? They are Both Coded M5, A4 however I was told there is an issue with electronics. Any advise would help before I go Changing this out? jsalazar@brenneraero.com
Also my spreadsheet has a nice RPM vs speed chart based on tire size and gearing. Very useful. 
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