Synchronizers let you shift gears without grinding.

Overview

Synchro is two cones pressed together until the two shafts run the same speed:

http://i297.photobucket.com/albums/mm219/ddgonzal/Transmission/synchro.jpg http://i297.photobucket.com/albums/mm219/ddgonzal/Transmission/Borg_Warner_Cone_synchro_a.jpg

Each gear has a syncho face (external cone) machined with it

http://i297.photobucket.com/albums/mm219/ddgonzal/Transmission/gear_with_cone.jpg

The hub is spring loaded so when you move the shifter partway, it presses the baulk ring (internal cone part) against the gear cone.

http://i297.photobucket.com/albums/mm219/ddgonzal/Transmission/Borg_Warner_Cone_synchro_a.jpg

When they have slowed down to the same speed, the shifter will move all the way in. It happens very quickly, unless the synchros are worn and not working well.

V I D E O Blocker Ring Synchromesh Unit - How it works! (click to view)

Synchro is basically:

Coupling with hub

Baulk ring cone

Gear face cone

Coupling with hub. Left: assembled from the parts shown

Album 22990

Each synchro set services two gears (arrows). Center arrow points to the Coupling Sleeve (The Coupling Sleeve is what the shifter moves)

http://i297.photobucket.com/albums/mm219/ddgonzal/Transmission/11754.jpgAlbum click to view

The hub is keyed to the mainshaft, so the hub sleeve rotates constantly in the Shift Fork while the car is moving.

http://i297.photobucket.com/albums/mm219/ddgonzal/Transmission/shift_Fork_synchro_hub.jpg http://i297.photobucket.com/albums/mm219/ddgonzal/Transmission/shift_Fork_In_synchro_hub.jpg

The spring lets the hub move side-to-side inside the Coupling Sleeve, but not move too far. On this one there is a total of about 1/4" (5mm) total movement possible. The baulk ring, which fits in the hub, is pushed against the gear cone. Once the two shafts are synchronized, the spring pops the dog teeth together.

http://i297.photobucket.com/albums/mm219/ddgonzal/Transmission/synchro_spring.jpg http://i297.photobucket.com/albums/mm219/ddgonzal/Transmission/Synchro_hub_in.jpg http://i297.photobucket.com/albums/mm219/ddgonzal/Transmission/Synchro_hub_out.jpg

Cracked shifting inserts can prevent gear shifting

Album 17839

Warner Vs Porsche Type Synchros

F5C56A 5-speed has very different synchros from the 4-speed. It has competition type synchros (the "C" in F5C56A) which are very different: instead of a brass baulk ring, it has two split rings. Both types have a conical section to them. They are the same type as early Datsun Roadster 'servo' type but smaller size.

4-speed: W56 'W' Warner (Borg Warner) BRONZE baulk-ring type syncromesh 5-speed: C56 'C' Type STEEL Porsche split-ring☁ synchromesh.

http://i297.photobucket.com/albums/mm219/ddgonzal/Transmission/56-18.jpg

4-speed: W56 'W' BRONZE baulk-ring type syncromesh

http://i297.photobucket.com/albums/mm219/ddgonzal/Transmission/c-synchro.jpg

5-speed: C56 'C' Type STEEL synchro

http://i297.photobucket.com/albums/mm219/ddgonzal/Transmission/w-synchro.jpg

Comparison

Album 18112 http://i297.photobucket.com/albums/mm219/ddgonzal/Transmission/synchro_types.jpg

Gearbox

56-Series Transmission

#32604-18000 RING-baulk * 3-speed B10, B110 & B210 * 4-speed early B10 #32604-H1000 RING-baulk * 4-speed B10 late, B110 #32604-H7300 RING-BAULK * B211 F456A, F4W60L (from 7407) > 32604-H1000 * B120 F456A 7407-7510 #32604-H9000 RING-BAULK (4) * B120 7510- * B310 F4W56A, F4W60L(F4+F5)

http://i297.photobucket.com/albums/mm219/ddgonzal/Transmission/B211_032-03-01_56A.jpg

3-speed 32604-18000 B110,B210 RING-baulk 32604-H1000 B10 <> 32604-18000 32604-H7300 B210 > 32604-H1000 <> 32604-H1010

4-speed F4W56L, F4W56A 32604-18000 B10 RING-baulk #32604-H1000 B10 <> 32604-18000 #32604-H9000 B120 RING-BAULK (4) #32604-H9000 B310 RING-BAULK F4W56A, F4W60L(F4+F5) #32604-H7300 RING-BAULK B211 F456A, F4W60L (from 7407) > 32604-H1000 32604-H7300 RING-BAULK B210 F456A (from 7407) > 32604-H1010 (from 7311) <> 32604-H1000 32609-18000 INSERT-SHIFTING (6) [plate] 32603-18000 SPRING-SHIFTING INSERT (4) (or SPRING-synchronizer, RING-SYNCHRONIZER) 32601-18000 HUB-SYNCHRONIZER (2) 32606-18000 SLEEVE-COUPLING (2) 32262 32265-18000 WASHER-THRUST, synchronizer hub [input gear side]

4-SPEED EARLY 32601-18000 HUB-SYNCHRONIZER 1 4 SPEED $78 USD 32604-H1000 BAULK RING 32606-18000 SLEEVE-COUPLING $52 USD

4-SPEED LATE 32601-H7301 HUB-SYNCHRONIZER, 1ST & 2ND, 3RD & 4TH $83 USD * same as 60-series Transmission 4-speed & 5-speed (1st & 2nd only) 32604-H9000 BAULK RING $44 USD * also replaces ealier 32604-H1000 * same as 60-series Transmission 4-speed 32606-18000 SLEEVE-COUPLING * same as 60-series Transmission 4-speed & 5-speed

5-SPEED 32601-H7200 HUB-SYNCHRONIZER, 2nd & 3rd, 4th & 5th 5-speed 32606-H7200 SLEEVE-coupling

F5C56A

'C' type STEEL split-ring synchros with triangular hubs

http://i297.photobucket.com/albums/mm219/ddgonzal/Transmission/o0480036013163215307.jpg Album 26077

5-speed was never available in pre-56A form (was designed from the go with improvements over the original 56L 4-speed)
Used steel "competition" (Porsche type) synchros in F5C56A form
Datsun Competition in one instance mentioned warner type synchros (F5W56A). However, other Datsun sources such as the B110 and B210 parts catalogs only list F5C56(A) and Porsche type synchros Datsun Model Series B210 parts catalog (Japan market) Album 26355

1984 Nissan Competition Catalog:

The 5-speed transmission (FS5C56A) was originally installed on certain non-USA models of the 1200 ... The synchro mechanism is the servo-type (steel).

Album 16819

5-SPEED F5C56A 32601-H7200 HUB-SYNCHRONIZER (2) 32606-H7200 SLEEVE-coupling (2) 32611-H7200 RING-synchro 32612-H7200 BLOCK-thrust 32613-H7200 BLOCK-anchor 32614-H7200 BAND-brake 22 (2) $3 USD 32616-H7200 CIRCLIP

32603-18000 SPRING-SYNCHRONIZER * B11/B12/B13/B14 4-speed, 5-speed, E16, SR20DE, GA16DE * B110/B210 4-speed * B210/B310 4-speed, 5-speed * N10/N12/N13 F4, F5 * T11

5-speed parts

Album 26075 Album 26076

Coupling sleeve and HUB-synchronizer

http://i297.photobucket.com/albums/mm219/ddgonzal/Transmission/32606-H7200%20.jpg http://i297.photobucket.com/albums/mm219/ddgonzal/Transmission/synchro-1.jpg

Outer split-ring, inner split-ring and two half-rings

http://i297.photobucket.com/albums/mm219/ddgonzal/Transmission/o0480036013163215203.jpg http://i297.photobucket.com/albums/mm219/ddgonzal/Transmission/o0480036013163232650.jpg http://i297.photobucket.com/albums/mm219/ddgonzal/Transmission/o0480036013163215243.jpg

RING-synchronizer

http://i297.photobucket.com/albums/mm219/ddgonzal/Transmission/w-synchro.jpg http://i297.photobucket.com/albums/mm219/ddgonzal/Transmission/32606-H7200a.jpg

F5C56A Warner Conversion

Pitroad will convert your F5C56A to Warner synchros for 559,000 yen☁ or sell you 58000 yen kit☁. It uses stock 60L syncho rings (#32604-H9000). To support this it includes new 60L-style synchro hubs, and modified shift rods.

Post 490433

60-Series Transmission

60L vs 60A

http://i297.photobucket.com/albums/mm219/ddgonzal/Transmission/56-04.jpg

#32604-H7300 RING-BAULK [6-tooth] * F4W60 4-SPEED B210 with A14 (HB210, HB211) * F4W56A 4-SPEED B210

#32604-H9700 RING-BAULK [30-tooth] * FS5W60A 5-speed (5) B310 1980-

#32604-H9000 RING-BAULK [12-tooth] * F4W56A 4-speed late (4) 7510- B120 1200 Truck * F4W60L 4-speed late (4) B310, B310 with A14/A15 * FS5W60L 5-speed (5) B310 -1979

63-Series Transmission

#32604-P0100 RING-BAULK * A14-equipped B210 5-speed * 63A 5-speed for A-engine * 63A 5-speed for L-engine * 71B 4-speed, 5-speed

32604-P0100 RING-BAULK (5) FS5W63A 5-speed 32606-N7100 SLEEVE-COUPLING <> 32606-73200 2 32605-N9000 HUB-SYNCHRONIZER,4TH & 5TH 32601-N9000 HUB-SYNCHRONIZER 2ND & 3RD 32609-73201 INSERT-SHIFTING 6 32603-73200 SPRING-SPREAD 4 32245-N9000 GEAR-REVERSE,MAIN (38T) 32258-N9001 HUB-SYNCHRONIZER,1ST & REVERSE 32608-N9000 INSERT-SHIFTING 3 32602-32200 SPRING-SYNCHRONIZER 3

32609-73201 INSERT-SHIFTING * 63 5-speed * Z31 VG30.MT.F5 3rd-4th

32603-73200 SPRING-SPREAD * 63 5-speed * B11/B12/B13/B14 * D21 4WD.KA24E.MT.FT * GC22.Z24I * N12/N13 * S12.VG30E.MT * T11 * Z31.VG30.MT.F5

Part Number

3264-18000

32604-18000 B110 56-series 3-speed 32604-18000 B10 3-spd, 4-spd <> 32604-H1000

Per B10 parts catalog, 180 is interchangeable with H10, however the B110 catalog makes no indication of this.

H1000 H1001 Thickness 7.8 8.2 mm Outside Diameter 69.6 69.3 O. D. less teeth 60.2 59.2

Per Ningbo, the dimensions differ slightly from H10

http://i297.photobucket.com/albums/mm219/ddgonzal/Transmission/pro_201514162824.jpg

32604-H1000

56-series 4-speed * 32604-H1000 Baulk Ring * 32604-H1010 alternate supplier * 32604-H7300 > H10

H73 may be used to replace H10, but not vice-versa.

Per Nissan Parts, the original H10 synchros were "replaced" by the #H90 part, however the dimension are different.

Specs for OAT06-551003

http://i297.photobucket.com/albums/mm219/ddgonzal/Transmission/032.jpg

aftermarket H10 specs

http://i297.photobucket.com/albums/mm219/ddgonzal/Transmission/pro_20151416304.jpg

Some vendors list a 32604-H1001, however it differs from H1000 and it is unknow if this is an actual Nissan listing

http://i297.photobucket.com/albums/mm219/ddgonzal/Transmission/SynchronizerForNissan32604-H1001.jpg

H1000 H1001 Thickness 7.8 8.2 mm Outside Diameter 69.6 69.3 O. D. less teeth 60.2 59.2 cone part min dia 51 50.3 cone part max dia 53 52.3

Inspection

Place the baulk ring over the gear and push down to seat it, then measure the clearance between the teeth. Too little clearance is probably caused by a worn ring.

Normal: 1.05-1.40 mm Limit: 0.50 mm

http://i297.photobucket.com/albums/mm219/ddgonzal/Transmission/TM-28.jpg

http://i297.photobucket.com/albums/mm219/ddgonzal/Transmission/Tm28.jpg

Fit ring to gear

Album 22988

Measure 56A synchro clearance

Album 22989

32604-H7300

32604-H7300 RING-baulk (from '74-7) * 6-tooth: 3 sets of 2 teeth

3 used * 4-speed F4W56A early * 4-speed F4W60L A14/A15 gearbox

H73 synchro

http://i297.photobucket.com/albums/mm219/ddgonzal/Datsun%201200/wiki/32604-H7300.jpg

Interchange with #H10 is backwards only

Post 479835

Assembled

Album 22970

OPS International OAT06-551002

http://i297.photobucket.com/albums/mm219/ddgonzal/Transmission/2-OAT06-551002.jpg

OAT06-551002 specs

http://i297.photobucket.com/albums/mm219/ddgonzal/Transmission/022.jpg

32604-H9000

H90 rings with more dog teeth replaced earlier types that had less teeth. Less teeth makes for easier shifting but is noisier/harsher. The new type make smoother shifts but take more effort on the shift lever.

Search for part: 32604-H9000ᴳ

32604-H9000ᴳ RING-BAULK replaced #H10 rings replaced #H73 rings * 12 teeth (3 groups of 4 teeth, a group every 120 degrees) * 60L (not 60A) * 5-speed FS5W60L 5 used B310 32604-H9000 RING-BAULK FS5W60L * 4-speed F4W60L 4 used B310 32604-H9000 RING-BAULK F4W60L * Late 56A 4-speed 4 used B120 7510- 32604-H9000 RING-BAULK F4W56A B310 32604-H9000 RING-BAULK F4W56A

Post 490420 Album 25677 Post 490420

32604-H9700

32604-H9700 RING-BAULK * FS5W60A 5-speed late (5)

32604-H9700 Synchro BAULK RING & matching gear surface

Album 25678 Post 492758

Genuine Nissan H97 (60A)

Post 492758

32604-H9700 Synchro BAULK RING by Long-Ming

Post 492758

DCIF-2253A (32604-H9700)

Post 492758

H97 has three sets of three internal grooves

Post 479791

32604-P0100

32604-P0100 RING-BAULK * 63 5-speed, including B210.A14 versions * 71B 4-speed, 5-speed * 30 teeth (3 groups of 10 teeth)

JMIT/Jiun Mu DCIF-2254－32604-P0100/A6410 http://i297.photobucket.com/albums/mm219/ddgonzal/Transmission/2254.jpg

OPS International OAT06-551008 (32604-P0100) http://i297.photobucket.com/albums/mm219/ddgonzal/Transmission/OAT06-551008.jpg

Comparison

H1000 H1001 H90 H97 P01 Thickness mm 7.8 8.2 9 ? 8.5 Outside Diameter 69.6 69.3 68 ? 75.5 O. D. less teeth 60.2 59.2 60 ? 66.4 cone part min dia 51 50.3 51.5 ? 57.6

Thickness: 9 mm 60L 8.5 mm 63A/71B 7.8 mm 56 ? 60A Outside Diameter 76.5 mm 63A/71B 69.6 mm 56 68 mm 60L ? 60A

Outside Diameter Less Teeth 66.4 mm 63A/71B 60.2 mm 56 60 mm 60L ? 60A

Inside Diameter 58.6 mm 63A/71B 52.5 mm 60L 52 mm 56 ? 60A

Teeth Pattern 3 x 10 63A/71B 3 x 4 60L 3 x 2 Late 56A 30 Early 56A, 56L 30 60A

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Synchros

Contents

Overview

Warner Vs Porsche Type Synchros

Gearbox

56-Series Transmission

F5C56A

F5C56A Warner Conversion

60-Series Transmission

63-Series Transmission

Part Number

3264-18000

32604-H1000

Inspection

32604-H7300

32604-H9000

32604-H9700

32604-P0100

Comparison

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