300tdi to td5 gear box ?

Jonnyb1990 · Dec 2, 2013

Afternoon,

My new Job requires me to drive longer distances then I used to, now mainly motorways,

Having 6 gears over 5 gave me an idea,

Is there an easy way if anyway to mate a 300tdi engine (the original) to an out sourced gearbox from a TD5 defender ?

Am I wasting my time ?

Thor1950 · Dec 2, 2013

why???????????? you want better highway drving ability change transfer box to a disco box

Dr_evil · Dec 2, 2013

300 wont mate to a TD5 box but I'm selling a brand new short bellhousing R380 (but can convert to long if needed) gearbox with higher ratio gears in it?

Will bolt straight up to the 300tdi

Mines the 53J so better motorway ratios I suppose looking at it Links

Jonnyb1990 · Dec 2, 2013

Hadt thought about the transfer box,

Out of curiosity, why cant a 300tdi be mated to a TD5 gearbox ?

Either way it explains why I couldn't find any info about mating the two together,

Would the Disco's transfer box affect they way it drives in offroad/snow & icy conditions ?

Dr_evil · Dec 2, 2013

because its a different bellhousing and a few other mods too, 68 suffix instead of 50's

transfer box will only differ in high, low is the same

Jonnyb1990 · Dec 2, 2013

Dr_evil said:
because its a different bellhousing and a few other mods too, 68 suffix instead of 50's

transfer box will only differ in high, low is the same

Ok that makes sense,

Can a R380 accommodate an "overdrive" ?

Or is my best bet the transfer box ?

Dr_evil · Dec 2, 2013

think you can get hold of GKN and Roverdrive units for them but seriously no need, either fit a higher ratio main box or higher ratio transfer

THEengineer · Dec 2, 2013

Dr_evil said:
think you can get hold of GKN and Roverdrive units for them but seriously no need, either fit a higher ratio main box or higher ratio transfer

thought 300 tdi and td5 both used R380 boxes?

jamesmartin · Dec 2, 2013

THEengineer said:
thought 300 tdi and td5 both used R380 boxes?

they do but bell housing is longer as is input shaft ,also you cant just chenge input shafts so easily as 300s tend to be j suffix with smaller input bearing and td5 k suffix on with larger bearing which also means case and front cover differ

Jonnyb1990 · Dec 2, 2013

I thought they used different ones due to a 6th gear,

Still got some options to ponder on now though !

Cheers guys !

jamesmartin · Dec 2, 2013

Jonnyb1990 said:
I thought they used different ones due to a 6th gear,

Still got some options to ponder on now though !

Cheers guys !

6 speed box isnt an r380 and goes with tdci

Jonnyb1990 · Dec 2, 2013

jamesmartin said:
6 speed box isnt an r380 and goes with tdci

Then thats what I was thinking of

Take it that its the same scenario ?

Thor1950 · Dec 2, 2013

Jonnyb1990 said:
Then thats what I was thinking of

Take it that its the same scenario ?

It has been talked about before 6th in a puma is not much different than a r380 5th. Change to a 1:2 transfer box, low range is the same in them all. This will give you better motorway driving and MPG

jamesmartin · Dec 2, 2013

Jonnyb1990 said:
Then thats what I was thinking of

Take it that its the same scenario ?

anythings possible but id think not easily and not with off the shelf lr parts

THEengineer · Dec 2, 2013

jamesmartin said:
they do but bell housing is longer as is input shaft ,also you cant just chenge input shafts so easily as 300s tend to be j suffix with smaller input bearing and td5 k suffix on with larger bearing which also means case and front cover differ

right i have learned something cheers james(and doc)

Funkykipper · Dec 2, 2013

Jonnyb1990 said:
Hadt thought about the transfer box,

Out of curiosity, why cant a 300tdi be mated to a TD5 gearbox ?

Either way it explains why I couldn't find any info about mating the two together,

Would the Disco's transfer box affect they way it drives in offroad/snow & icy conditions ?

Td5 input shaft is different to a 300 tdi even though it's the same box in principal.

I did a modification on my old Discovery 300tdi which involved changing the old fifth gear to a V8 fifth gear.

This reduces the motorway cruising revs by about 500 rpm. giving a higher MPG.

A new fifth gear costs around £100 and then labour to fit it.

Dr_evil · Dec 2, 2013

All you need to do is get the local place to pull the collar and undo the 32mm nut then you can swap it over, get them to tighten nut up again and you can put the box back together!

Not even 5 mins worth of labour for them

thats how I did mine

300tdi to td5 gear box ?

Jonnyb1990

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Thor1950

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Dr_evil

Banned

Jonnyb1990

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Dr_evil

Banned

Jonnyb1990

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Dr_evil

Banned

THEengineer

whatever

jamesmartin

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Jonnyb1990

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jamesmartin

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Jonnyb1990

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Thor1950

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jamesmartin

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THEengineer

whatever

Funkykipper

Green Laning Activist.

Dr_evil

Banned

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