STC1889 | LT77 Mainshaft - 77mm 5-speed | Defender, Discovery 1, Range Rover Classic
To check the stock of Genuine Parts before placing an order please use our Contact Us page
To check the stock of Genuine Parts before placing an order please use our Contact Us page
To check the stock of Genuine Parts before placing an order please use our Contact Us page
To check the stock of Genuine Parts before placing an order please use our Contact Us page
Land Rover Part Number: STC1889 - LT77 Mainshaft
STC1889 is an LT77 mainshaft. Fitted as the central rotating shaft in the LT77 77mm 5-speed manual transmission, it supports the gear clusters, bearings and synchroniser assemblies and carries the driven gears, splines and bearing journals that transfer torque from the layshaft and input shaft to the gearbox output. Correct shaft alignment and spline condition are necessary for smooth gear changes and to avoid premature bearing or synchromesh wear; where shafts show wear, scoring or damaged splines, gearbox noise, vibration or difficulty selecting gears can occur. The shaft is typically inspected during a gearbox overhaul.
Use the compatibility data below to confirm fitment against your V.I.N.
Compatibility
- Defender (1987-2006) - LT77 77mm 5-speed manual
- Discovery 1 (1989-1998) - 4-cylinder (From VIN FA393361 to WA799999)
- Range Rover Classic (1992-1994) - (From VIN JA610294)
Frequently Asked Questions
The LT77 mainshaft carries the driven gears and provides the splines and bearing journals that transmit torque from the layshaft and input shaft to the gearbox output. It also supports synchroniser assemblies and the running surfaces for bearings. Common failure modes are spline wear, scoring or bearing damage, which can cause noise, vibration or difficulty selecting gears; the shaft is normally inspected during a gearbox overhaul and replaced if damaged.
| Model | Variant |
|---|---|
| Land Rover Defender | 1987 - 2006 - Mainshaft (5 Speed Manual Transmission) (L315) |
| Land Rover Discovery 1 | 1989 - 1998 - 4-cylinder (From VIN FA393361 to WA799999) |
| Land Rover Range Rover Classic | 1992 - 1994 - Mainshaft (From VIN JA610294) |
If you are unsure of compatibility with your vehicle, you can also confirm by checking against your V.I.N. Simply reach out to us with your V.I.N and desired part number via our Contact page or use our Finding Part Numbers page.
Inspect the mainshaft during a gearbox overhaul and replace it if splines are worn, scored or bearing journals are damaged; replacing a damaged shaft prevents further gearbox wear and shifting issues. If unsure, consult a gearbox specialist for a confirmed assessment.
- C8 products are usually supplied by Britpart.
- L8 products are genuine Land Rover parts.
- Z8 products are normally supplied by Allmakes.
All products and accessories available on LRDirect.com come with a 2-year warranty.