GEARBOX LAYSHAFT 1ST GEAR, 27T, TRIUMPH, UNIT 350, 500, GENUINE NOS, 57-3999
GEARBOX LAYSHAFT 1ST GEAR, 27T, TRIUMPH, UNIT 350, 500, GENUINE NOS, 57-3999
Replaces OEM Part No: 57-3999 (also replaces part numbers: T3999)
1 piece. Gearbox layshaft 1st gear, 27 tooth to suit various Triumph unit construction 350, 500 models. 3TA, 5TA, T100 etc
This is a genuine part, never used, signs of shelf wear may be evident but item is perfectly serviceable. Parts might be covered in protective coating layer from factory.
Please use the part numbers to verify specifics for your application.
Top quality, genuine spare part.
Made In England.
More From This Category
GEARBOX LAYSHAFT NEEDLE BEARING & THRUST WASHER SET, TRIUMPH, 57-1614, 57-1606, 57-1607
![](/assets/themes/trojanclassic/images/product-availabile-img.png)
GEARBOX SPROCKET, TRIUMPH UNIT, 5 SPEED, 18T, 57-4784, T4784
![](/assets/themes/trojanclassic/images/product-availabile-img.png)
GEARBOX SPROCKET, TRIUMPH, TR6 T120, 4 SPEED, UNIT, 21T, 57-1919 /21 TOOTH
![](/assets/themes/trojanclassic/images/product-availabile-img.png)
KICK START COTTER PIN ASSEMBLY, TRIUMPH, BSA, GENUINE, 57-4356, T4356, 57-1222
![](/assets/themes/trojanclassic/images/product-availabile-img.png)
KICKSTART LEVER FOR TRIUMPH, 650, TR6 T120, 750, TR7 T140, T150, BSA A50 A65, 57-3632
![](/assets/themes/trojanclassic/images/product-availabile-img.png)
KICKSTART PINION LOCK TAB WASHER, TRIUMPH, 750, GENUINE, 57-7076
![](/assets/themes/trojanclassic/images/product-availabile-img.png)
KICKSTART RUBBER, TRIUMPH, SCRIPTED, OPEN END, 57-2330 A, T2330 A
![](/assets/themes/trojanclassic/images/product-availabile-img.png)
BEARING CIRCLIP FOR HIGH GEAR, TRIUMPH, GENUINE, 70-0489, E489, T489, 68-0024
![](/assets/themes/trojanclassic/images/product-availabile-img.png)
Latest Products
INLET MANIFOLD BALANCE CONNECTOR PIPES (PR) TRIUMPH 750, GENUINE, 71-7103, 71-3313
![](/assets/themes/trojanclassic/images/product-availabile-img.png)
GIRLING FRONT BRAKE MASTER CYLINDER ASSEMBLY, TRIUMPH, 750 1979 ON, 60-7163 G
![](/assets/themes/trojanclassic/images/product-availabile-img.png)
AIR FILTER ELEMENTS, PAIR, WITH BACK PLATE BAFFLE, TRIUMPH T140, BSA A65, 60-4265
![](/assets/themes/trojanclassic/images/product-availabile-img.png)
GENUINE LUCAS 22B BRAKE LIGHT SWITCH, ON CHAIN GUARD, 54033234, 99-0725, 31445, 31437
![](/assets/themes/trojanclassic/images/product-availabile-img.png)
AIR FILTER ELEMENT WITH BACK PLATE BAFFLE, TRIUMPH T140 BSA A65 1974 ON, 60-4265
![](/assets/themes/trojanclassic/images/product-availabile-img.png)
GEARBOX LAYSHAFT THRUST WASHERS (SET 2) TRIUMPH, GENUINE, 57-1607, T1607
![](/assets/themes/trojanclassic/images/product-availabile-img.png)
GEARBOX LAYSHAFT NEEDLE BEARING & THRUST WASHER SET, TRIUMPH, 57-1614, 57-1606, 57-1607
![](/assets/themes/trojanclassic/images/product-availabile-img.png)
SEAT HINGE SET, TRIUMPH, T100 TR6 T120 T150, 1968-70, GENUINE, 82-7862, F7862, 82-8026, F8026
![](/assets/themes/trojanclassic/images/product-availabile-img.png)
Top Sellers
KICK START COTTER PIN ASSEMBLY, TRIUMPH, BSA, GENUINE, 57-4356, T4356, 57-1222
![](/assets/themes/trojanclassic/images/product-availabile-img.png)
GEARCHANGE RUBBER, TRIUMPH, BSA, OVAL, 57-2450, T2450, 89-3208
![](/assets/themes/trojanclassic/images/product-availabile-img.png)
KICKSTART RUBBER, TRIUMPH, SCRIPTED, OPEN END, 57-2330 A, T2330 A
![](/assets/themes/trojanclassic/images/product-availabile-img.png)
KICKSTART PINION LOCK TAB WASHER, TRIUMPH, 650, 750, GENUINE, 57-2240, T2240, T732
![](/assets/themes/trojanclassic/images/product-availabile-img.png)
KICK START RUBBER, TRIUMPH, SCRIPTED, PRE-UNIT, 82-1814, F1814
![](/assets/themes/trojanclassic/images/product-availabile-img.png)
GEARCHANGE QUADRANT RETURN SPRING, TRIUMPH, 650, 750, GENUINE, 57-7051, 57-0404, T404
![](/assets/themes/trojanclassic/images/product-availabile-img.png)
KICK START RETURN SPRING, TRIUMPH, 500, 650, 750, T150, T160, 57-0031, T31
![](/assets/themes/trojanclassic/images/product-availabile-img.png)
GEARBOX LAYSHAFT THRUST WASHER, TRIUMPH, GENUINE, 57-1607, T1607
![](/assets/themes/trojanclassic/images/product-availabile-img.png)
Popular Products
GEARBOX LAYSHAFT NEEDLE BEARING & THRUST WASHER SET, TRIUMPH, 57-1614, 57-1606, 57-1607
![](/assets/themes/trojanclassic/images/product-availabile-img.png)
GEARBOX SPROCKET, TRIUMPH UNIT, 5 SPEED, 18T, 57-4784, T4784
![](/assets/themes/trojanclassic/images/product-availabile-img.png)
GEARBOX SPROCKET, TRIUMPH, TR6 T120, 4 SPEED, UNIT, 21T, 57-1919 /21 TOOTH
![](/assets/themes/trojanclassic/images/product-availabile-img.png)
KICK START COTTER PIN ASSEMBLY, TRIUMPH, BSA, GENUINE, 57-4356, T4356, 57-1222
![](/assets/themes/trojanclassic/images/product-availabile-img.png)
KICKSTART LEVER FOR TRIUMPH, 650, TR6 T120, 750, TR7 T140, T150, BSA A50 A65, 57-3632
![](/assets/themes/trojanclassic/images/product-availabile-img.png)
KICKSTART PINION LOCK TAB WASHER, TRIUMPH, 750, GENUINE, 57-7076
![](/assets/themes/trojanclassic/images/product-availabile-img.png)
KICKSTART RUBBER, TRIUMPH, SCRIPTED, OPEN END, 57-2330 A, T2330 A
![](/assets/themes/trojanclassic/images/product-availabile-img.png)
BEARING CIRCLIP FOR HIGH GEAR, TRIUMPH, GENUINE, 70-0489, E489, T489, 68-0024
![](/assets/themes/trojanclassic/images/product-availabile-img.png)