LT 77 gearbox replacement
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LT 77 gearbox replacement
Info for a novice required ... My LT77 gearbox has just lost drive to all gears except 4th, went with a bit of a bang tbh .... And I'm hoping to replace it with an LDV gearbox that I have located , now the gearbox I have , reverse is next to 1st , and the one I'm hoping to fit reverse is down from 5th, so I'm guessing its the later R380 type, and I'm wondering if the imput shaft spigot will fit my crank bush, and splines will fit my clutch plate, can anyone tell me if the shafts are the same before I go to the trouble of removing it from the van .... Any advice will be greatly appreciated .... Thanks
The R380 is stronger but not strong enough for anything serious.
If you want a cheap alternative then consider a Toyota Supra box.
The one to get is the late supra with the steel sandwich plate, as they are relatively cheap and common. Dont use the alloy sandwich plate ones behind a high power v8, it wont last.
W58 ALLOY CASE WITH STEEL SANDWICH PLATE c1989 – 2005 as used in Mk3, Mk 4 Supras and Lexus SC 300s.
This is the strongest of the boxes - the late model W58. You can pick these up for about $1000 from breakers here. I've seen v8s that have lunched the 'standard' boxes (W55, 56, 57 etc) but the W58 is strong - its stronger than a T5.
The W58 has a cast "steel" selector detent plate/centre bearing plate.
The W57's, 56's and 55's are all alloy cases.
No real markings on gearbox.
At front has 9 bolts, 2 dowels, 250mm high, 197mm wide.
Several gearlever positions. 455mm, 515mm, 530mm, from front face of gearbox.
3 options on driveshaft yoke size
34 Kg dry weight. [Note: W50,W51 Celica steel case boxes weigh 40kg]
It differs from the W57 in its fifth-gear ratio.
Toyota lists a change from an alloy sandwich plate to a steel sandwich plate around 1989. The steel sandwich plate has some minor internal differences (some wider bearings, some wider gears, slightly different gear selection mechanism, etc.).
Ratios:
W58
1st – 3.28
2nd – 1.89
3rd – 1.27
4th – 1.00
5th – .78
Rover:
1st 3.32:1
2nd 2.09:1
3rd 1.40:1
4th 1.00:1
5th 0.83:1
Dellow Conversions do a fitting kit that includes everything needed for a RV8 installation including the tailshaft - costs around $1200.
If you want a cheap alternative then consider a Toyota Supra box.
The one to get is the late supra with the steel sandwich plate, as they are relatively cheap and common. Dont use the alloy sandwich plate ones behind a high power v8, it wont last.
W58 ALLOY CASE WITH STEEL SANDWICH PLATE c1989 – 2005 as used in Mk3, Mk 4 Supras and Lexus SC 300s.
This is the strongest of the boxes - the late model W58. You can pick these up for about $1000 from breakers here. I've seen v8s that have lunched the 'standard' boxes (W55, 56, 57 etc) but the W58 is strong - its stronger than a T5.
The W58 has a cast "steel" selector detent plate/centre bearing plate.
The W57's, 56's and 55's are all alloy cases.
No real markings on gearbox.
At front has 9 bolts, 2 dowels, 250mm high, 197mm wide.
Several gearlever positions. 455mm, 515mm, 530mm, from front face of gearbox.
3 options on driveshaft yoke size
34 Kg dry weight. [Note: W50,W51 Celica steel case boxes weigh 40kg]
It differs from the W57 in its fifth-gear ratio.
Toyota lists a change from an alloy sandwich plate to a steel sandwich plate around 1989. The steel sandwich plate has some minor internal differences (some wider bearings, some wider gears, slightly different gear selection mechanism, etc.).
Ratios:
W58
1st – 3.28
2nd – 1.89
3rd – 1.27
4th – 1.00
5th – .78
Rover:
1st 3.32:1
2nd 2.09:1
3rd 1.40:1
4th 1.00:1
5th 0.83:1
Dellow Conversions do a fitting kit that includes everything needed for a RV8 installation including the tailshaft - costs around $1200.
It dont fit
Well I found out today that an R380 is not an easy replacement for the LT 77 as the imput shaft is about 1/2" longer so fouls on the flywheel .... Took a few attempts before I discovered the problem, and unfortunately just changing the imput shaft looks to be a full gearbox strip .... Plan B me thinks .....
Re: It dont fit
That's odd, mine was more or less at straight swap and it was the same for someone else that I know.muz47 wrote:Well I found out today that an R380 is not an easy replacement for the LT 77 as the imput shaft is about 1/2" longer so fouls on the flywheel .... Took a few attempts before I discovered the problem, and unfortunately just changing the imput shaft looks to be a full gearbox strip .... Plan B me thinks .....
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Make a suitable plate to take up the difference and put it between bell housing and engine, job done.
Flywheel stays where it is, so no starter issues and there should be enough pipe to allow the clutch to move back half an inch or so and the slip joint on the driveshaft should take up the slack.
Flywheel stays where it is, so no starter issues and there should be enough pipe to allow the clutch to move back half an inch or so and the slip joint on the driveshaft should take up the slack.
Cheers,
John
John
