boites a+

je voudrais pas fouttre ma merde , mais ces con d'anglais on fait 2 type de pignonerie pour les boites a+

quelqu'un connais la date de transition ?

nop

Il semblerai que des modifications soient intervenues en 1979, 1982 et 1984;
En 1979, passage de 14 mm a 18 mm pour NOSE MAINSHAFT
RODCHANGE4SYNCHROMESH
Beginning of 1973 the remote gear lever housing extensions were replaced by two external rods, hence the
name rod change gearbox. Internally the three selector shafts were replaced by one.
About 1982 A-Plus gears started appearing, which were identified by having a groove mark in the middle of the teeth
on 2nd/3rd gear, 1st motion and 4th gear on the laygear. These were cut at a different tooth angle making the gears
(less noisy) with different ratios again.
About 1984 the center main double roller retainer was changed from 4 holes to 3 holes as the case tended to crack
where one of the locating holes for the retainer was drilled.

A suivre

The 4 Synchro Gearbox
1968 On
Fortunately 4 synchro gearboxes are much easier to identify and classify than their 3 synchro
predecessors (parts availability is considerably better, too, but not brilliant in some areas). The two
main changes are the modification of gear shafts and several of the bearings in 1979, and A Plus gears.
A Plus gears were progressively introduced, the bulk of models changing o ver around 1982. They have
a sharper tooth angle and different pitch making them quieter than the earlier gears, with which they
are not interchangeable. A Plus gears may be identified by the presence of a circumferential groo ve in
the centre of the teeth, plus flush machining on both sides of the final drive pinion.
The following summaries help with identification and give you points to watch for when ordering parts:
1968-73 Saloon and Estate, 1968-75 Van and Pick Up
Pre-A Plus gears. Direct/remote gearchange type reverse gear and mainshaft bearing retainer (four
screw fitting). 9/16" dia. nose on 3rd motion shaft, two step layshaft, laygear takes two large bearings
and one small bearing. Different ratios for 1275 models.
1973-79 Saloon and Estate, 1975-79 Van and Pick Up
Pre-A Plus gears. Rod gearchange type reverse gear and mainshaft bearing retainer (4 screw fitting).
9/16" dia. nose on 3rd motion shaft, two step la yshaft, laygear takes two large bearings and one small
bearing. Different ratios for 1275 models.
1979-82
Pre-A Plus gears (except for final drive pinion on 3.444:1 ratio models , which became A Plus in 1979).
Rod gearchange type reverse gear and mainshaft bearing retainer (4 screw fitting). 11/16" dia. nose on
3rd motion shaft, three step layshaft, laygear takes one large and one small bearing. Idler and 1st
motion shaft drive gear ratios revised, idler gear bearings in gearbox case revised (diameter change).
Different ratios for 1275 models.
1982 on
A Plus gears. Rod gearchange type reverse gear and mainshaft bearing retainer (4 screw fitting
reducing to 3 screw fitting in 1984). 11/16" dia. nose on 3rd motion shaft, three step layshaft, laygear
takes one large and one small bearing. Different ratios for French 1275 models in the 1990s.
Close ratio and straight cut close ratio gear sets are available for 4 synchro pre-A Plus and A Plus
gearboxes , as special orders; please contact Somerford Mini for details. Similarly, contact us if you have
Special Tuning helical close ratio or straight cut close ratio gears and you require replacement parts.
Reverse Idler Gear
1 22G1034 REVERSE IDLER, 17/18 teeth, 1 1968-73, Saloons and Estates;
direct/remote gearchange type 1968-75, Vans and Pick Ups.
22G1832 REVERSE IDLER, 17/18 teeth, 1 1973-79, Saloons and Estates;
rod gearchange type 1976-79, Vans and Pick Ups.
TUB10020 REVERSE IDLER, 17/18 teeth, 1 1979 on.
rod gearchange type
2 TUJ10001 BUSH, reverse idler 1
3 DAM8038 SHAFT, reverse idler 1
Laygear
4 22G927 LAYGEAR, 15/20/25/29 teeth 1 1968-79; 2 step layshaft, not 1275.
22G1040 LAYGEAR, 15/20/25/29 teeth 1 1968-79; 2 step layshaft, 1275.
5 DAM3169 LAYGEAR, 15/20/25/29 teeth 1 1979-82; 3 step layshaft, not 1275.
DAM3168 LAYGEAR, 15/20/25/29 teeth 1 1979-80; 3 step layshaft, 1275.
DAM4931 LAYGEAR, 15/21/26/30 teeth, A Plus type 1 1982 on; 3 step layshaft,
not 1990-96, 1275 France .
DAM6238 LAYGEAR, 15/21/27/31 teeth, A Plus type 1 1990-96, 3 step layshaft, 1275 France.
6 22G931 LAYSHAFT, tw o step type 1 Fit to 22G927 and 22G1040 laygears.
7 DAM3187 LAYSHAFT, three step type 1 Fit to all other laygears.
8 2A3581 PLATE, locating reverse idler shaft/layshaft 1
9 CHM141 BEARING, needle roller, laygear, large 2/1 Qty. 2 in 22G927/22G1040 gears only.
10 88G396 BEARING, needle roller, laygear, small 1 Fit to 22G927 and 22G1040 gears only.
11 13H9513 BEARING, needle roller, laygear, small 1 Fit to all other laygears.
12 22G856 WASHER, thrust, small, 0.123-0.124" 1 Fit to 22G927 and 22G1040 laygears.
(3.12-3.14mm)
22G857 WASHER, thrust, small, 0.125-0.126" 1 Fit to 22G927 and 22G1040 laygears.
(3.17-3.20mm)
22G858 WASHER, thrust, small, 0.127-0.128" 1 Fit to 22G927 and 22G1040 laygears.
(3.22-3.25mm)
22G859 WASHER, thrust, small, 0.130-0.131" 1 Fit to 22G927 and 22G1040 laygears.
(3.30-3.32mm)
13 DAM3180 WASHER, thrust, small, 0.121-0.123" 1 Fit to DAM3169, DAM3168, DAM4931
(3.07-3.12mm) and DAM6238 laygears.
DAM3181 WASHER, thrust, small, 0.124-0.126" 1 Fit to DAM3169, DAM3168, DAM4931
(3.15-3.20mm) and DAM6238 laygears.
DAM3182 WASHER, thrust, small, 0.127-0.129" 1 Fit to DAM3169, DAM3168, DAM4931
(3.22-3.27mm) and DAM6238 laygears.
DAM3183 WASHER, thrust, small, 0.130-0.132" 1 Fit to DAM3169, DAM3168, DAM4931
(3.30-3.35mm) and DAM6238 laygears.
14 22G860 WASHER, thrust, large 1
1st Motion Shaft
15 22G1093 SHAFT, 1st motion, 17 teeth 1 1968-79; not 1275 models.
22G1371 SHAFT, 1st motion, 18 teeth 1 1968-79; 1275 models.
DAM3092 SHAFT, 1st motion, 17 teeth 1 1979-82; not 1275 models.
DAM3167 SHAFT, 1st motion, 18 teeth 1 1979-80; 1275 models.
DAM4930 SHAFT, 1st motion, 17 teeth, A Plus type 1 1982 on; not 1990-96, 1275 (France).
DAM6242 SHAFT, 1st motion, 16 teeth, A Plus type 1 1990-96, 1275 (France).
16 22G2033 RING, baulk 1
17 CHM172 BEARING, 1st/3rd motion shafts , 9/16” i.d.1 For 22G1093/22G1371 1st motion shafts.
13H9513 BEARING, 1st/3rd motion shafts , 11/16” i.d.1 For all other 1st motion shafts .
18 ADU7619 BEARING, 1st motion shaft 1 In gearbox case.
19 22G850 CIRCLIP, bearing retaining 1 0.094-0.096" (2.39-2.44mm)
22G851 CIRCLIP, bearing retaining 1 0.097-0.099" (2.46-2.51mm)
For the 1st motion shaft bearing supporting the nose of the shaft in the flywheel housing, please see the
Somerford Mini catalogue ‘Flywheel Housing and Clutch Cover’ section.
3rd Motion Shaft
20 22G833 SHAFT, 3rd motion, 9/16" nose dia. 1 1968-79.
DAM7484 SHAFT, 3rd motion, 11/16" nose dia. 1 1979 on.
21 AAU1365 BEARING, 3rd motion shaft 1
22 ADU4992 RING, spring, bearing retaining 1
23 22A522 RETAINER, 3rd motion shaft bearing, 1 1968-73, Saloons and Estates;
4 screw fixing, direct/remote change type 1968-75, Vans and Pick Ups.
DAM1756 RETAINER, 3rd motion shaft bearing, 1 1973-84, Saloons and Estates;
4 screw fixing, rod change type 1976-84, Vans and Pick Ups.
24 DAM5996 RETAINER, 3rd motion shaft bearing, 1 1984 on.
3 screw fixing, rod change type
25 SH505071 SCREW, retainer to gearbox case 4/3 Qty. 4 for 22A522/DAM1756 retainers .
26 DAM2377 LOCK TAB, screw 2/1 Qty. 2 for 22A522/DAM1756 retainers .
27 DAM6047 LOCK TAB, screw 1 For DAM5996 retainer.
28 2A3714 SHIM, retainer A/R 0.003" (0.076mm)
2A3715 SHIM, retainer A/R 0.010" (0.254mm)
1st Gear
29 22G1096 GEAR, 1st speed, 31 teeth 1
30 22G2033 RING, baulk 1
31 AAU1815 BEARING, needle roller, 1st speed gear 1
32 22G837 JOURNAL, 1st speed gear 1
1st/2nd Synchroniser
33 DAM7455 GEAR ASS’Y, 1st/2nd synchroniser 1
34 BLS107 BALL, synchroniser 3
35 22G2262 SPRING, synchroniser 3
2nd Gear
36 22G1094 GEAR, 2nd speed, 26 teeth 1 1968-82.
DAM4932 GEAR, 2nd speed, 26 teeth, A Plus type 1 1982 on; not 1990-96, 1275 (France).
DAM6240 GEAR, 2nd speed, 25 teeth, A Plus type 1 1990-96, 1275 (France).
37 22G2033 RING, baulk 1
38 AAU1816 BEARING, needle roller, 2nd speed gear 1
39 22G839 WASHER, thrust, 2nd speed gear 1
40 22G843 PEG, 2nd speed gear 2
41 22G154 SPRING, 2nd speed gear 1
3rd Gear
42 22G1095 GEAR, 3rd speed, 21 teeth 1 1968-82.
DAM4933 GEAR, 3rd speed, 21 teeth, A Plus type 1 1982 on; not 1990-96, 1275 (France).
DAM6241 GEAR, 3rd speed, 20 teeth, A Plus type 1 1990-96, 1275 (France).
43 22G2033 RING, baulk 1
44 AAU1816 BEARING, needle roller, 3rd speed gear 1
45 22G947 WASHER, thrust, 3rd speed gear 1
46 22G843 PEG, 3rd speed gear 1
47 22G154 SPRING, 3rd speed gear 1
3rd/4th Synchroniser
48 DAM7456 GEAR ASS’Y, 3rd/4th synchroniser 1
49 BLS107 BALL, synchroniser 3
50 22G2262 SPRING, synchroniser 3
Final Drive Pinion
51 22G99 PINION, 15 teeth, 4.333:1 ratio 1 With 65 tooth 22G443 final drive gear.
22G99 PINION, 15 teeth, 4.267:1 ratio 1 With 64 tooth 22G370 final drive gear.
22G99 PINION, 15 teeth, 4.133:1 ratio 1 With 62 tooth 22G101 final drive gear.
22G338 PINION, 16 teeth, 3.938:1 ratio 1 With 63 tooth 22G340 final drive gear.
22A399 PINION, 17 teeth, 3.765:1 ratio 1 With 64 tooth 22A401 final drive gear.
22A399 PINION, 17 teeth, 3.647:1 ratio 1 With 62 tooth 22G940 final drive gear.
22A413 PINION, 18 teeth, 3.444:1 ratio 1 With 62 tooth 22A411 final drive gear.
DAM3647 PINION, 15 teeth, A Plus, 4.333:1 ratio 1 With 65 tooth DAM3645 final drive gear.
DAM3218 PINION, 16 teeth, A Plus, 3.938:1 ratio 1 With 63 tooth DAM3216 final drive gear.
DAM4131 PINION, 17 teeth, A Plus, 3.765:1 ratio 1 With 64 tooth DAM4779 final drive gear.
DAM4131 PINION, 17 teeth, A Plus, 3.647:1 ratio 1 With 62 tooth DAM4162 final drive gear.
DAM2679 PINION, 18 teeth, A Plus, 3.444:1 ratio 1 With 62 tooth DAM2677 final drive gear.
DAM2808 PINION, 19 teeth, A Plus, 3.211:1 ratio 1 With 61 tooth DAM2806 final drive gear.
DAM2808 PINION, 19 teeth, A Plus, 3.105:1 ratio 1 With 59 tooth DAM6327 final drive gear.
DAM5927 PINION, 20 teeth, A Plus, 2.950:1 ratio 1 With 59 tooth DAM5925 final drive gear.
TCC10001 PINION, 21 teeth, A Plus, 2.762:1 ratio 1 With 58 tooth TCB10004 final drive gear.
52 DAM7485 NUT, pinion retaining 1
53 DAM6140 LOCK TAB, pinion nut 1

Ou encore:
Mini Transmissions
The manual gearbox created for the Mini in 1959 was an essential factor in the
amazing space efficiency of the car. Developed from the gearbox used by BMC’s other
A Series-engined cars of the time like the Morris Minor (and sharing many of the
gearbox internals), the Mini gearbox was the first to be positioned under the engine.
This allowed the entire power unit to be mounted transversely in the car, keeping the
area occupied by it to a bare minimum.
Gear selection was made by a long gear lever (‘direct change’), remembered affectionately
as the ‘magic wand’ or ‘pudding stirrer’ by those who owned early Minis. Power was
transferred from the engine and clutch down to the gearbox via a series of three gears
colloquially referred to as the drop gears; the design initially allowed oil onto the clutch
all too frequently, causing severe slippage. The sealing system had to be quickly
redesigned and a programme was carried out to modify the Minis built thus far.
After this hiccup the Mini gearbox settled down to a reasonably trustworthy existance.
It was, however, still subjected to many improvements through the years and apart from
the basic shape of the gearbox case very little of the 1990s Mini gearbox is reco gnisably
the same as that on early cars .
Most of the modifications centred on improving the gearchange - a remote gearchange
arrived in 1961 (for several years fitted only to Coopers, it had the additional benefit
of considerably steadying engine movement), cone synchromesh gave way to baulk rings
in 1962, a proper synchromesh gear replaced the old ‘crash’ first gear in 1968 and the
remote gearchange plus the gear selectors were replaced by a system known as ‘rod
change’ in 1973.
Two other major design modifications are worthy of note, both involving quietening the
gearbox. Around 1963-64 the angle of the gear teeth was changed (post-modification
gears being known as B Type and pre-modification retrospectively becoming A Type).
This happened again around 1982 (the new gears being known as A Plus), bringing the
Mini gearbox in line production-wise with the recently introduced Austin Metro. Exact
identification of a Mini manual gearbox prior to replacement of gears is therefore of
paramount impor tance - different angled gear teeth will not mesh together!
Automatic transmission arrived in the Mini for 1965. A special automatic specification
engine block had to be cast, a fact not lost on Mini owners who have converted their
cars from automatic to manual and had to change the engine as well as the gearbox.
The Mini automatic has significantly worse fuel economy as well as poorer acceleration
than that managed by manual Minis , detracting from the automatic’s claim to be the
better town car, which in some other respects it undoubtedly is. Also, refinement is not
the automatic’s greatest feature; it changes gear rather a lot (often downwards),
subjecting the car’s occupants to even more noise than in a manual Mini.
It is surprising that the innovative and promising Mini automatic was largely starved of
development during its 35 years in production, major changes being confined to the the
gearchange mechanism, plus the introduction of A Plus drop gears in 1982.
Opinions concerning Minis fitted with automatic transmission entrench the enthusiast
fraternity, the vast majority believing that the only good thing you can do with an
automatic Mini is to convert it to manual. Yet the automatic Mini still does have its
supporters, not least in Japan, the Mini’s biggest market in the 1990s , where nearly all
of the Minis sold were automatics because of that country’s highly congested city roads.

Elle n'est pas belle ma poesie.

Moi j'ai une boite A+ monté sur un bloc A avec un étagement de A... Et ça semblais d'origine...

Et bien NOP, tu n'as pas aimer ma poesie

faut que je passe au garage comparé un peu tout ca

j'ai plusieur train fixe a+ (un roulement de chaque coter) , celui de la boite 5 est plus petit au niveau de la 4 (chipoter pas, on se comprend) , j'ai éxactement le meme (mise a part l'entrainement central de la boite 5) sur une boite 4 provenant d'une merguez estimer a 87 , les 2 n'ont qu'un seul sillon sur les dents , par contre , j'ai 3 ou 4 train fixe a+ , avec plus de ratiches sur la 4 , et 2 sillons

et la , j'ai pas tout lu ta poésie , mais ca semble pas trop coller : /

nop

Pour plus de renseignements:
http://www.minimania.com/Downloads.cfm

Ils causent de la boite 5

bah voila :
4 SYNCHRO GEARS 1979 ON ROD CHANGE WITH 18MM NOSE MAINSHAFT
11 DAM3169 Laygear, 15.20.25.29 teeth ..................................................... 1
11 DAM3168 Laygear, 15.20.25.29 tth (smaller diameter 29 teeth area) ........ 1 1275GT
11 DAM4931 Laygear, 15.21.26.30 teeth ..................................................... 1 A plus marking

ca m'en dit pas plus sur la date ...

nop