Gearbox lt77?
- Thread starter Bjk67
- Start date
1396midget
Well-Known Member
that looks very much like one. has it got a number on it?
vaultsman
Well-Known Member
What's the serial number? Should be stamped on the pad near the plug.
A guide to LT77 serial numbers:
The V8 Owners Forum - :: View topic - LT77 Gearbox Identification
From the driver's position, if reverse is away from you and forward then it's an LT77. If it's towards you and back, it's an R380.
A guide to LT77 serial numbers:
The V8 Owners Forum - :: View topic - LT77 Gearbox Identification
From the driver's position, if reverse is away from you and forward then it's an LT77. If it's towards you and back, it's an R380.
Yes an LT77. Going by the look of the stamped markings my guess would be suffix C because the last letter looks like the original stamping font, most likely a regular LT77 of SD1 origin. Without the original first 3 numbers/letters it would be hard to positively identify it's original application. Should be fine in a P6 behind an average V8 assuming it's not worn.
unstable load
Well-Known Member
Pull the sump plug and have a look at what comes out on the magnet. It will have some debris on it as a part of general running, but if it looks like a fir tree then you may well have problems now or down the line.
They do need the correct spec oil to promote longevity and smooth operation, though.
They do need the correct spec oil to promote longevity and smooth operation, though.
Also worth giving the input shaft a wobble, there is likely to be a little bit of play, but not to the point where the sides of the input shaft touch the release sleeve. They have tapered bearings inside which once the original pre-load/shimming has gone out of spec allows the internals to move about and wear quicker.
They are strong gearboxes which will happily howl on for years!
They are strong gearboxes which will happily howl on for years!
Baron von Marlon
Member
Going by the CL - C, it's originally from a TR7.
unstable load
Well-Known Member
or until you fit a hotter cam like I did. Reduced it to an anchor in a few hundred miles of very fun driving.
I'd hope they should be ok in a P6 for the most part - the LT77 in my 3.5 EFI powered Landrover has taken some abuse (4-wheel wheelspin anyone?) and is touchwood ok so far. The first box I fitted when I converted it to v8 was bought and then sat in parents garage for a year and a bit before I fitted it. When I finally fitted it I drained the oil only to find it was half full of water! The previous owner must have pressure washed it clean or something. Lesson learnt - drain fluids on anything secondhand when purchased... 
Even with half the box internals sat in water for that time the box still lasted over a year before it had to come out.
Even with half the box internals sat in water for that time the box still lasted over a year before it had to come out.
unstable load
Well-Known Member
In all fairness, mine was probably due for overhaul when I turfed the auto box and went LT77.
Due to scarcity of bits I took what I could and ran with it, fitting the cam was the last straw for a very tired box.
Due to scarcity of bits I took what I could and ran with it, fitting the cam was the last straw for a very tired box.
Baron von Marlon
Member
It could be from a TR7, but those usually have a 'CL' somewhere in the number, at least all of the ones that I've encountered so far have. The current 'box in mine is from a TR7 and starts 14ACL, perhaps the 'CL' was dropped at some point. 15A appears to have been allocated to the TR8 'boxes, according to information I've read on a TR7 forum.
