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Author Topic: Peerless 700 Transmission Gears: Part Numbers & Ratios  (Read 13973 times)
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RoMow
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« on: April 27, 2011, 10:14:02 AM »

   For you racers running, or considering running, a 700-Series Peerless transmission, here is a list of the part numbers and available ratios for all the gears.  Both the older 7xx-Series transmissions (e.g. 702, 761, etc.) and the later 700-Series (700-002, 700-761, etc.) are included.  All gear part numbers shown, except those numbers that are superceded, are currently still available from Peerless.
   I find it interesting that the early 7xx-Series transmissions were not originally offered with steel gears but, as you can see by the supercessions, can have steel gears installed.

7xx-Series (702, 761, etc.) Transmission Gears

Powdered Metal                 Steel

Teeth    P/N                    Teeth     P/N

Shift-Key Shaft Gears

37   778146A -- use 778207A (steel)      
35   778125
30   778124A
25   778123A
22   778122A
20   778121A
19   778209 -- use 778273 (steel)

Countershaft Gears

12   778145
15   778136
15   778151
20   778126A
25   778127A
28   778128A
30   778129A
31   778163 -- use 778208 (steel)

700-Series (700-002, 700-061, etc.) Transmission Gears

Powdered Metal            Steel

Teeth   P/N            Teeth   P/N

Shift-Key Shaft Gears

35   778183            37   778207A
34   778251            37   778215
30   778185A          35   778206A
27   778250            32   778239A
25   778187            30   778205A
22   778190            25   778204A
                            22   778203A
                            19   778273

Countershaft Gears

16   778241*          12   778145
23   778249            12   778192
25   778127A          15   778136
25   778186            15   778193
28   778189            15   778199
28   778202            18   778240
                            20   778184
                            20   778200
                            25   778201
                            28   778202
                            31   778208
* Use 778259

Ratios

# of Teeth   Ratio

12:37      3.08:1
15:35      2.33:1
16:34      2.13:1
18:32      1.78:1
20:30      1.50:1
23:27      1.17:1
25:25      1.00:1
28:22      0.79:1
30:20      0.67:1
31:19      0.61:1

   Note that many of the steel gear part numbers are the same as the gears for the 820 transaxles, so by using other 820 gears, you could expand your ratio options even more.  The complete list of 820 gears and ratios is in my "820 Transaxle & 017 Kit" post.

  Sooner or later, some alert racer is going to ask me why same-number-teeth gears on the same shaft have different part numbers.  I'm still researching that...

   Also, for reference, the ratio on the input bevel gears is 3.00:1.  Peerless part numbers for the 14T Driver & 42T Driven input gears are:
Powdered Metal -- 778113A Input Shaft Bevel Gear & 778137A Countershaft Bevel Gear;
Steel -- 778153 Input Shaft Bevel Gear & 778154 Countershaft Bevel Gear.
These input gears for the 700 transmissions are the same as the input gears on the 800- & 801-Series transaxles, except the 800s originally only came with the powdered metal gears.  


Respectfully,
Rodney Rom
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« Reply #1 on: April 27, 2011, 10:49:05 AM »

Very cool information. Thanks for taking the time to do this.
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« Reply #2 on: April 27, 2011, 12:07:52 PM »

Very cool information. Thanks for taking the time to do this.

   You're most welcome.  Anything to help...

Rodney Rom
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« Reply #2 on: April 27, 2011, 12:07:52 PM »

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« Reply #3 on: April 27, 2011, 05:20:40 PM »

When you say "powdered metal" what does that consist of? Powdered steel or some aluminum/pot metal mix? The reason I asked is because when I built my tranny, I checked the gears with a light touch to the belt grinder and they all sparked. Powdered steel gears will still spark like regular steel gears and now I'm concerned about the integrity of my 700.  I guess I could some it up with: Do powdered gears spark?
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« Reply #4 on: April 28, 2011, 09:29:58 AM »

When you say "powdered metal" what does that consist of? Powdered steel or some aluminum/pot metal mix? The reason I asked is because when I built my tranny, I checked the gears with a light touch to the belt grinder and they all sparked. Powdered steel gears will still spark like regular steel gears and now I'm concerned about the integrity of my 700.  I guess I could some it up with: Do powdered gears spark?

  Justin,

   "Powdered Metal" is actually a very fine steel alloy powder (almost like steel dust) that is put into a mold the shape of the gear (or whatever other part it's being used to make), then superheated and tightly compressed while heated.  It's almost like forging, except the metal is in powder form instead of liquid.  I'm sure other parts may be made from powdered aluminum or "pot metal" but the gears are steel alloy powder.
   Yes, sanding or grinding powdered-metal gears will produce sparks, the same as any other ferrous-base metal.  To identify gears, most PM gears will have a gold-bronze color whereas the steel gears will be a dark silver/gray/black color.  You should also be able to visually see the hobbing marks on the steel gear teeth, but the PM gear teeth will be smooth-faced.  To save weight, many PM gears also have holes in the webbing; steel gears, being cut from bar stock, don't.
  Hope this helps.

Respectfully,
Rodney Rom
Rom's Reworks
Butler, MO
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« Reply #5 on: April 28, 2011, 01:09:04 PM »

Good info. Looks like I need to open that tranny back up. They were a gold color Sad
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« Reply #6 on: April 28, 2011, 06:37:50 PM »

i have ordered so called steel gears and they have come with holes in them. so are they pm or steel? confused 700-039 gears. what are they? im not sure now
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« Reply #7 on: April 28, 2011, 06:47:52 PM »

The easiest way to tell is to look for machining marks, once you have seen a steel gear you will know it, it is easy to see the difference.
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« Reply #8 on: April 28, 2011, 06:54:16 PM »

what machine marks am i looking for? i have seen marks on all gears. confused
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« Reply #9 on: April 28, 2011, 07:22:26 PM »

Look at the outside edge of the gear and the face of the teeth, there will be little lines on them . If your "usure, well maybe those...I think"...prolly not steel. As soon as you see a steel gear you will say "Ohh, I see!"
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« Reply #10 on: April 28, 2011, 08:38:38 PM »

i have a peerless 701 is it the same thing?
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« Reply #11 on: April 28, 2011, 09:41:44 PM »

I have ordered so-called steel gears and they have come with holes in them. So are they PM or steel? confused 700-039 gears. What are they? I'm not sure now.

   John, compare the numbers off the boxes the gears came in to the part numbers in the columns above.  Are your ordered gears the standard 039-ratio gears?

Sincerely,
Rodney Rom
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« Reply #12 on: May 01, 2011, 02:13:08 PM »

I have a Peerless 701 - is it the same thing?

   All Peerless transmissions that have:
1. a 6-digit Model Number in which the first three digits are '700-', or
2. a 3-digit Model Number starting with '7', such as your 701,
are considered '700 transmissions' and are covered by the information above.

Sincerely,
Rodney Rom
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« Reply #13 on: May 19, 2011, 11:04:04 AM »

Why do some have multiple part #'s for the same amount of teeth for the steel gears?
Also.. In the gear ratio would the shift key shaft gear be listed first then the countershaft?  Ex 20:30?
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« Reply #14 on: May 21, 2011, 10:53:15 AM »

Why do some have multiple part #'s for the same amount of teeth for the steel gears?
Also.. In the gear ratio would the shift-key shaft gear be listed first then the countershaft?  Ex 20:30?

   Question 1:  Some ratios have multiple part numbers for the same-number-teeth gears due to engineering differences that the OEM transmission buyer specified when they ordered the transmissions from Peerless.  I don't do a lot of work on the 700s but I would imagine you could use any matching ratio set and it would fit and work properly.  If you really want to be absolutely certain, refer to the 700 Transmission Parts List to see which gear pairs match.

   Question 2:  No.  In the gear ratio, the first gear-tooth number listed in the ratio ("20" of the 20:30 in your question) is the number of teeth of the driver gear, the gear on the Countershaft, which is the shaft with the larger, driven input-bevel gear; the second number ("30") is the number of teeth on the driven gear which is on the Shift-Key Shaft.  Your 20:30 example, then, is a 1.50:1 ratio gear pair.

   Hope this helps.

Sincerely,
Rodney Rom
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