TB slipping in reverse

Chadstone Pat · Mar 25, 2023

Hi All, my 200tdi 90/defender transfer box slips in reverse hi range unlocked making a horrible crack noise. Have I stripped a spline gear ?

tottot · Mar 25, 2023

Does it move when you lock the centre diff ?

Chadstone Pat · Mar 25, 2023

tottot said:
Does it move when you lock the centre diff ?

Yes it does

tottot · Mar 25, 2023

Can you tell where crunch is comming from?

Chadstone Pat · Mar 26, 2023

the heart of the tb by the sound of it

lynall · Mar 26, 2023

Last time tb oil changed?

tottot · Mar 26, 2023

If quiet and working when locked but noisy and not working when open then may be a problem with the centre diff in the front output housing.

Chadstone Pat · Mar 26, 2023

lynall said:
Last time tb oil changed?

Its been changed quite a lot recently as it lashing out the rear seal !

Chadstone Pat · Mar 26, 2023

tottot said:
If quiet and working when locked but noisy and not working when open then may be a problem with the centre diff in the front output housing.

so probably easier to replace fb if I can find one ?

lynall · Mar 26, 2023

Chadstone Pat said:
so probably easier to replace fb if I can find one ?

Yes change is quiet easy, weight balance is weird so be prepared for it to twist as you pull it off the gearbox, check out what intput gear you have and if you can upgrade to a cross drilled type.

Standard defender one is 1.4, disco is 1.2.

Chadstone Pat · Mar 27, 2023

lynall said:
Yes change is quiet easy, weight balance is weird so be prepared for it to twist as you pull it off the gearbox, check out what intput gear you have and if you can upgrade to a cross drilled type.

Standard defender one is 1.4, disco is 1.2.

its a disco 200tdi with trombone mackled exhaust manifold, but think it would be a 1:4 ?

lynall · Mar 27, 2023

Chadstone Pat said:
its a disco 200tdi with trombone mackled exhaust manifold, but think it would be a 1:4 ?

You can check the serial number at ashcroft transmissions site, there might even be a sticker on it stating the ratio.

Chadstone Pat · Mar 28, 2023

lynall said:
You can check the serial number at ashcroft transmissions site, there might even be a sticker on it stating the ratio.

do you happen to know where the serial number is ?

Hicap phill · Mar 28, 2023

Chadstone Pat said:
do you happen to know where the serial number is ?

Look near the filler hole/bung. Newer models are pin dot numbers on the lower left.
Also look for a little sticker near there for the ratio.

Chadstone Pat · Mar 28, 2023

Hicap phill said:
Look near the filler hole/bung. Newer models are pin dot numbers on the lower left.
Also look for a little sticker near there for the ratio.

Thats great thanks

Chadstone Pat · Mar 28, 2023

Hicap phill said:
Look near the filler hole/bung. Newer models are pin dot numbers on the lower left.
Also look for a little sticker near there for the ratio.

Good job I looked its a 1:222 ratio

Chadstone Pat · Mar 28, 2023

Chadstone Pat said:
Good job I looked its a 1:222 ratio

will any 1:222 Disco TB fit on it ?

TB slipping in reverse

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