Holden6 to LT77

[Slunnie]

Another thread about fitting 5-speeds to Series had me thinking.

As I understand it, the LT77 bolts up relatively easily onto the back of the Series 4cyl at least. Does anybody know if the LT77 will also go on to the back of a Holden 6cyl motor? If it does, I'm assuming that it would require the use of the engine conversions adaptor plate and associated parts - but does that work?

[30t of coolness]

You may want to check with some english Landrover modifiers as I have seen 4cyl petrol defender gearboxes with bellhousings & inputshafts that look much shorter than v8 or Tdi ones & may be more suitable when used with a holden conversion ;)

[Homestar]

From what I have managed to work out, then yes, the LT77 will bolt to the back of the holden red motor with the Landy adaptor plate on it. Now I think the only TC you can use behind the LT77 is the LT230 - which is a full time 4WD unit, so does that mean you just have to keep the front hubs locked in or is there more to it? Also, I would imagine the drive shafts would need some mods to bolt to the LT77?

I have heard mention of this, but can't remember where the conversation went...

Cheers - Gav

[bee utey]

I read somewhere the LT230 is relatively easy to modify to 2wd/4wd selection with a change in the centre diff.

[rovey]

yes its an easy fit, i have one in mine, it uses the standard holden to series adapter which fits straight to the lt 77.only cutting off of one bolt and done, the ashcroft kit $ 550 takes out the diff lock in the transfer box to make 2-4 wd drive .A good conversion and gearing is perfect.

[Slunnie]

yes its an easy fit, i have one in mine, it uses the standard holden to series adapter which fits straight to the lt 77.only cutting off of one bolt and done, the ashcroft kit $ 550 takes out the diff lock in the transfer box to make 2-4 wd drive .A good conversion and gearing is perfect.

Excellent, thanks Rovey. I was typing a reply when your notification came through.

I think Ashcroft also do a series transfer case adaptor also.

Thanks also for the comments on gearing, thats good that it works well despite the 4.7 diffs. Was that with a defender or discovery transfer case?

I had this in the back of my mind for my 6cyl ute as something that may be more usable - especially considering I hit the highway irrespective of where I'm going.

[rovey]

disco tx box with 4.7 gives 21.1 :1 ist gear and 2500 revs @ 95 ks wheras the defender gives a good 24.45 :1 ist but a higher 2830 revs @ 95 ks on highways

[Lotz-A-Landies]

Hi Simon

You need a Holden six to Rover 2 1/4 litre four cylinder adapter. You should look for an LT77 off a Defender 200Tdi because they are shorter than the Disco 200Tdi LT77 and the gear stick is in a similar position to the series transmission tunnel.

Santana LT230 had selectable output gears and there was a vendor in South Oz who were selling the kits some years ago. may be a bit hard to find these days as Santana no longer exists.

If you use the Ashcroft adapter, you lose the ability to use a rear PTO output for a winch etc.

If you go constant 4WD, you need to get the front half-shafts and swivels from a stage 1, these will bolt straight up to the series housing. But remember if you use a Stage 1 front housing you should use a DC jointed prop shaft because of the angle of the stage 1 pinion.

I am currently working on an R380 to Rover six using an Ashcroft short bellhousing kit, but am still waiting for modification work on the flywheel housing to be completed (mates rates and timeframe). To save space between the gearbox and the crossmember behind the gearbox I plan to use a disk brake conversion to the transmission brake.
...
Thanks also for the comments on gearing, thats good that it works well despite the 4.7 diffs. Was that with a defender or discovery transfer case?

I had this in the back of my mind for my 6cyl ute as something that may be more usable - especially considering I hit the highway irrespective of where I'm going.The Disco/Range Rover hi ratios are very close to the series box ratios. Your other option is to find the high range gearset from a 1984/1985 Range Rover 3 speed Torqueflyte auto which had 1.003:1 ratio. The 5th gear and disco t/f will be close to a series box with overdrive.

All LT230 have the same low ratio, and with 4.7:1 diffs and 31" tyres you will have a vehicle that will almost climb trees. (You could change to Stage 1 3.54:1 diffs)


Diana

[Slunnie]

disco tx box with 4.7 gives 21.1 :1 ist gear and 2500 revs @ 95 ks wheras the defender gives a good 24.45 :1 ist but a higher 2830 revs @ 95 ks on highways

Thanks Rovey, thats fantastic!

[rovey]

yes the 200 tdi defender is preferable, short shaft,but the lt77 is only rated at 280 nm , if you get a hot holden this may be vulnerable, get the later lt77s the later g & h suffix is rated at 350 -360nm as it has larger bearings and mainshaft, it is very much an r380 really. As a fit the r380 is possible but the bolt pattern neads altering!

[Lotz-A-Landies]

... As a fit the r380 is possible but the bolt pattern neads altering!The Ashcroft short bellhousing kit is designed to convert an R380 to the 200Tdi bolt pattern and Defender LT77 overall length.

[Slunnie]

Hi Simon

You need a Holden six to Rover 2 1/4 litre four cylinder adapter. You should look for an LT77 off a Defender 200Tdi because they are shorter than the Disco 200Tdi LT77 and the gear stick is in a similar position to the series transmission tunnel.

Santana LT230 had selectable output gears and there was a vendor in South Oz who were selling the kits some years ago. may be a bit hard to find these days as Santana no longer exists.

If you use the Ashcroft adapter, you lose the ability to use a rear PTO output for a winch etc.

If you go constant 4WD, you need to get the front half-shafts and swivels from a stage 1, these will bolt straight up to the series housing. But remember if you use a Stage 1 front housing you should use a DC jointed prop shaft because of the angle of the stage 1 pinion.

I am currently working on an R380 to Rover six using an Ashcroft short bellhousing kit, but am still waiting for modification work on the flywheel housing to be completed (mates rates and timeframe). To save space between the gearbox and the crossmember behind the gearbox I plan to use a disk brake conversion to the transmission brake.The Disco/Range Rover hi ratios are very close to the series box ratios. Your other option is to find the high range gearset from a 1984/1985 Range Rover 3 speed Torqueflyte auto which had 1.003:1 ratio. The 5th gear and disco t/f will be close to a series box with overdrive.

All LT230 have the same low ratio, and with 4.7:1 diffs and 31" tyres you will have a vehicle that will almost climb trees. (You could change to Stage 1 3.54:1 diffs)


Diana

Thanks Diana, that is fantastic information, I never realised the Defender LT77 was a short bellhousing. Thank you for all of this info!

[Lotz-A-Landies]

AFAIK all the Defender 200Tdi and 2.5 litre 90 are the same shorter bellhousing. It needs to be shorter to fit the 90 wheelbase.

Here is the link to the Ashcroft stumpy R380 kit Ashcroft Transmissions - Short Bellhousing R380 (http://www.ashcroft-transmissions.co.uk/index.php?act=viewProd&productId=157)

http://www.ashcroft-transmissions.co.uk/images/uploads/44Ll.jpg