LT77 gearbox ID

289

New Member
Just bought 2 gearboxes but need help finding out what car had them

One box has the 'C' suffix on the casting boss
This has a red internal speedo gear

The other box has no casting boss but the markings are on the bottom edge near the bellhousing
This has a white speedo gear

Lastly, I have 3 clutch release arms......2 are the same length but different steel pressings
The third arm is slightly longer.

Any ideaswhat they came from ?
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Hi, The longer clutch arm is probably from a Land Rover g/box because they have a different shaped bell housing to cover a 10" clutch.

The speedo gear colours, from what I can make out, are different from LR and cars, so who knows what someone else has put in there. From memory for the 3.08 rear end you need a 20 tooth driven gear. However don't take that as gospel do your own research.

Colin
 
I didn't know a LT77 box could be a 4 speed.
Any idea on what type of car had these?
I thought they were all 5 speed boxes.

SD1 - 2600 - 3500 and TR7
and Sherpa Van were the only cars/vans that I know had them

The number found on the second gearbox starts with 17......it was found on the bottom edge near the bellhousing.
 
I didn't know a LT77 box could be a 4 speed.
Any idea on what type of car had these?
I thought they were all 5 speed boxes.

Base model 2300 had 4 speed with optional 5 speed, and according to the info I found so could the 2000.
 
Ah....thanks for that information.
Always learning something new

A pity I don't have the remote selector with gearlever from either box

I'll have a go at pulling out the end shaft and try selecting all the gears and see how the input spines and output prop end revolves......maybe see the speed
difference in the 2 boxes
 
Base model 2300 had 4 speed with optional 5 speed, and according to the info I found so could the 2000.

AFAIK the 2000 (assuming we're referring to the SD1 2000) were 5-speed only, unless perhaps the SA ones had 4 speeds?

The Jag XJ6 Series 111 3.4 & 4.2 also had the uprated Vitesse version of the box but there weren't many around.
 
AFAIK the 2000 (assuming we're referring to the SD1 2000) were 5-speed only, unless perhaps the SA ones had 4 speeds?

That's what I thought, but as I'd looked on the V8 forum as listed above I thought I'd mention the possibility.
 
Elsewhere I posted a pic of a 4 speed LT77 cross section - no parts at all inside the rear housing, except the oil pump.
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I just don't get the scope behind omiting a couple of gears in order to have a 4 speed version of this gearbox. It can't be cost of the parts themselves.
 
Marketing , they want a clear differential in specification to justify the price differential between models. Ideally charge the customer £500 as an option for bits that cost £5.
Modern vehicle are even worse. With electronics one can have all of features built into the ECU & just activate different ones for different models & it costs nothing to do.
 
I think a 2L 4 cyl in an SD1 body might have been in trouble pulling a 5th gear....
It's the opposite. Weak engines need more gears available, in order to allow the engine to stay within the torque band. I don't expect the overall 5th of a 2 litre SD1 to be the same with the 3,5 litre though.
 
It's the opposite. Weak engines need more gears available, in order to allow the engine to stay within the torque band. I don't expect the overall 5th of a 2 litre SD1 to be the same with the 3,5 litre though.

Correct, the V8s, I6s and I4 all had different diff ratios (3.08, 3.45 & 3.9:1 if I've correctly remembered the figures after checking).

2300s were 4-speed up until the introduction of Series 2 SD1s in 1982, after which all SD1s were 5-speed.
 
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