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  #1  
Old October 5th, 2007, 05:43 PM
Chuckwagon
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96 Disco XD Eco Challenge
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disco drivetrain into defender

Can the auto, tbox and front and rear ends of a 95 disco be "drop in" replacements for a d90?
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  #2  
Old October 6th, 2007, 09:08 AM
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S. Smith
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The Tcase ratio is lower in a defender than in a disco.

The taller ratio of the disco may even be preferable in terms of over all drivability, depending on your use.
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Old October 6th, 2007, 10:45 AM
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Well here is the idea. I have a 95 disco that has 140,xxx on the clock. I never drive it because of engine issues, everything else is mechanically if fine. Would like to pull the auto and rebuild it stronger. Pull the tbox beef it up a little and rebuilt it with the high range of the disco and low of a 90, GBR does that sort of thing right? Toy the front and rear ends. Buy a high mileage d90 and swap with the new rebuilt stuff. Sell the old d90 stuff off. It is much easier for me to do the rebuilds now and buy a d90 later, than buy a d90 now and then rebuild the d90 components. Need some more info from Jeff. I know that the 94's and 95's were manuals only and I have seen guys on here change from manual to auto and all the crap you need to do it, but would it be the same process with a disco auto as a d90 auto. And lastly, but prob wont happen, is to marry the auto and tbox to an SBC.
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Old October 6th, 2007, 10:55 AM
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I personally prefer driving my autobox RRC daily over my Defender 110 because it is a five speed and the gearing is lower, causing me to shift a lot and poke up the hills, 5th is too tall, 4th is too low.

The automatic is better in traffic and on the streets. It can be less tricky off road as well. I do prefer the manual when going down hills however, there it clearly has the advantage.

I have thought about putting an autobox in my Defender and I think if you get all the interior console components so it looks factory, then it would be an improvement.
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  #5  
Old October 6th, 2007, 04:31 PM
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Quote:
Originally Posted by JSBriggs
The High on the disco is 1.2 (I thought the D90's were as well) but there is also a 1.4 and a 1:1 (TF727 RR's) Maxidrive (available through GBR) also makes a gearing kit to lower the low range.
I think Scott might be referring to NAS110's which have the 1.4 TC high range.
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Old October 6th, 2007, 05:25 PM
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Jim C.
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I run a 300tdi/ZF/LT230 from a '99 D1 in my Defender. It looks like it belongs there...... almost.
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  #7  
Old October 6th, 2007, 06:00 PM
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What is the lowest hp EFI SBC, I thought that you could sort one out with only about 280hp and around the same or less tq, a ZF can't hold up to that? I also have an 94 Isuzu NPR my business uses that is having some cooling issues and may have to replace it with an newer model. I would love to take the 4BDT out of it and throw it in a d90 but I think that might be more than I am willing to take on or handle.
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Old October 7th, 2007, 07:43 PM
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Thank you Ryan you are correct.

I was refering to my personal experience.
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  #9  
Old October 8th, 2007, 01:18 PM
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There's also a 1:6 T-case option. This lower ratio was fitted to very first 110 models.

NAS 90's use the same 1:2 T-Case gearing as the Disco whereas Euro Defenders use the 1.4 ratio.

Common swap in the UK is to swap the 1.4 T-case for the 1.2 gears. Ashcroft also offers what it refers to as the 'quiet' 1.2 gearing from the Td5 Disco.

Low ratio remains the same whatever T-Case you use.

Ashcroft also do a copycat NAS center console for auto conversions. Not cheap by the time you've got all of the add-ons that you'll need to go with it.
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Old October 8th, 2007, 03:22 PM
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Charles Galpin
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As far as the change from manual to auto, with some clever linkage work, an auto "speed" shifter can be routed through the existing gear shift boot and it doesn't look bad. My truck has this setup and I can dig up a picture if it would help visualize it.

charles
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  #11  
Old October 8th, 2007, 03:52 PM
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Pics please!
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  #12  
Old October 8th, 2007, 04:18 PM
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Charles Galpin
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Ok, found a few decent shots.

http://lhsw.com/gallery/AC/DSC02025
http://lhsw.com/gallery/AC/DSC02028
http://lhsw.com/gallery/AC/DSC02088

I don't have any showing the actual shifter mounting and linkage.

charles
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  #13  
Old October 8th, 2007, 05:14 PM
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Assuming you have the D-90 cores, it will be ok, but . . . .

Your disco motor is 14CUX serp belt (or GEMS for 96 and up) which was never fitted in a D-90.

Center trans tunnel parts for auto are $$$$.

The LT230 linkage is much different.

Front end is similar except you do not have vented front rotors on a disco and you should use the D-90 steering linkage (disco has the damper on the track rod not off the tie rod).

Rear ends are basically the same except the disco may have a rotoflex third member. Brakes are slightly different and the disco will have ABS wires.
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  #14  
Old October 8th, 2007, 06:46 PM
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Ron

I wasn't thinking about the disco engine at all it's got too many problems.

Regarding the center trans tunnel parts, are you just refering to the cosmetic pieces like the NAS center concole or that a disco trans won't fit in a 90 because its has a different trans housing that interferes with a d90 body or frame.

As for the tcase, could the linkage off the 90 tcase replace the linkage off the disco trans and work?

I switched out the rotoflex in the rear a long time ago, so that is not a prob, I wonder if my RTE rear links will retrofit? Sounds like the front and rear would be pretty straight forward, just swaping out some parts for others.
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