Thread: gearbox identification help

ill post up more detailed/better pics tomorrow, inside and out... it has no vin plates or manufacturer plates on it to be seen

previous owner gave it had a complete respray in the mat black all over in side and out, chassis, body, engine bay and interior, including all wires and bolt ons (while engine was out) so a engine bay rewire is needed, lucky im a sparky, shame I hate car wiring

I was thinking about removing the bar but it does have its pluses, nice front and side protection against both sticks and roos that just love to jump out in front of unsuspecting cars out here..

the tray will stay until i find a very cheap original replacement

heaters?... to tell you the truth im not sure it has them or not.... I bought the car 2 yrs ago with the busted gear box when I was up working in the mines at roxby downs, it cost me a huge sum of a carton crowns it then took 12 months to get it back here home and another 6 months to get around to pulling out the box and get to where we are now, the motor runs sweet but I have never driven it, ive sat behind the wheel twice i think

now im waiting for the replacement bearing to arrive, so I can get the box back together and give it my first test drive, to then see what else could be wrong with it

Looks like a late IIA body (as I said the headlights moved to the guards in 1968) with SIII bits added.

So what size are the t-case intermediate gear bearings?

are the sizes /ratios marked on the gear or bearing?

I have those gears out as Ive had to remove the main gear box from the transfer case to get access to the rear of the box to get to the "holes" that allow the removal of the outer rear lay shaft bearing case, to find I dont have those holes, but I still got it out ...

ok here is a better pic of the front end



and the interior, looks shabby now but it will get sorted


dont you love the rope covered wheel

as for the intermediate gear bearings, internal size (shaft size) 28.5 mm external size 41mm, does that help at all?

cheers
Matt

It looks like a post 1967 SIIa firewall with the SIII dash grafted on to me. The give away are the windscreen hinges on the outside of the firewall with no evidence of the SIII brackets on the front face.

Also the LH mudguard has no hole for the SIII heater.

Around the gearbox tunnel, you can see where it has been cut to access the SII/SIIa hydraulic clutch slave cylinder.

Originally Posted by madmax

...

as for the intermediate gear bearings, internal size (shaft size) 28.5 mm external size 41mm, does that help at all?

cheers
Matt

Yes - that means you have a series 1/2 T-case (not series 2A/3).

So most likely the entire box and t-case is around a 1958 model S1, since the T-case matches the vintage of the serial number on the gearbox cover.

This probably also means you have the high ratio box. The ratios are here: Land Rover gear ratios

If you count the teeth on the layshaft and mainshaft gears we can tell you which box you have.

Originally Posted by isuzurover

Yes - that means you have a series 1/2 T-case (not series 2A/3).

So most likely the entire box and t-case is around a 1958 model S1, since the T-case matches the vintage of the serial number on the gearbox cover.

This probably also means you have the high ratio box. The ratios are here: Land Rover gear ratios

If you count the teeth on the layshaft and mainshaft gears we can tell you which box you have.

Hi ratio box?

Which box are you talking about? All the series 1 through 3 have the same High ratio 1.148:1 although the low ratio changes the S1/S2/S2a Suffix A & B have the 1.288:1 while the Suff C on and SIII have 2.35:1
I guess it depends upon which calculator you use? Ashcroft Transmissions - Ratio Calculator

Originally Posted by Lotz-A-Landies

Hi ratio box?

Which box are you talking about? ...

I was talking about the ratios in the main gear box (as per the link I posted):
The formatting doesn't work, but you get the idea.

Main gearbox

Suffix A & B
88 & 109

Suffix C on
88 & 109


Third

1.37:1

1.50:1


Second

2.04:1

2.22:1



First

3.00:1

3.60:1


Reverse

2.54:1

3.02:1

EDIT:
Ashcroft Calculator Final Drive Ratios:
S1 Box and T-case:

Ratio TableOverdrive High Low
First Gear 16.19:1 40.72:1
Second Gear 11.01:1 27.69:1
Third Gear 08.04:1 20.22:1
Fourth Gear 05.40:1 13.57:1

SIIA Suffix C-on Box and t-case

Ratio TableOverdrive High Low
First Gear 19.42:1 39.76:1
Second Gear 11.98:1 24.52:1
Third Gear 08.04:1 16.46:1
Fourth Gear 05.40:1 11.05:1

S1 Box and SIIA/SIII T-case

Ratio TableOverdrive High Low
First Gear 16.19:1 33.14:1
Second Gear 11.01:1 22.53:1
Third Gear 08.04:1 16.46:1
Fourth Gear 05.40:1 11.05:1

SIIA/III Box and SI T-case

Ratio TableOverdrive High Low
First Gear 19.42:1 48.86:1
Second Gear 11.98:1 30.13:1
Third Gear 08.04:1 20.22:1
Fourth Gear 05.40:1 13.57:1

I note the Ashcroft ratio calculator is incorrect as it selects the S1 box ratios for all of SIIA boxes.

In short though, the 1-3 ratios in the S1/II box are too tall and if it is out anyway it would be better to rebuild a later box and swap it over - but keep the lower low range of the existing t-case.