Series Gearbox ID

I there a difference between the gearboxes fitted to the 4 and 6 cylinders? If so, any idea what they are?

Thanks in advance.

Belhousing bolt pattern - Off the top of my head I think 4cyl is 12 o'clock and 6cyl is 11/1oclock.

Gearstick - 4cyl is bent, 6cyl is straighter.

As far as I know the other changes were S2a/S3 standard changes.

Thanks. Are the bellhousings interchangeable? Also where are the identifying numbers on them to check what suffix and model they are?

Cheers.

Gear lever has different bends. and bell housing is different. That's it. Ratios varied over time, but not according to the number of cylinders.

Series 3 boxes are all synchro, and Series 1/2/2a only have synchro on 3/4, and the bell housing arrangement for the clutch release is different as well.

But apart from these differences, boxes are pretty much interchangeable. There were detail changes throughout the life of the box (biggest one being the all synchromesh), mostly improvements, and the consensus is that the strongest box is late Series 2a, with late Series 3 not far behind.

But apart from the bell housing differences (bolt pattern and clutch release arrangement) the boxes are all a bolt in swap.

I havent tried to change the bellhousings, Lotzalandies or JDNSW may know. Re the numbers, check out this thread, there is some text and pics, there may be any combination of boxs/transfers.
Series Gearbox ID

I'm pretty certain bell housings can be swapped for 4 & 6 (but not S2/3), with the proviso that the layshaft diameter changed somewhere along the line, and they have to match.

Thanks - didn't see that thread in the stickies, but I did run a search. That has most of the info I need at the moment. I have some options around the box for my project - the original is a suffix A - just found that, so will see what the other boxes I have access to are. 😊

Will ask the mods to see if I can get this thread merged with the gearbox ID thread to keep all the info in 1 spot. 👍

Ok, looked at some other boxes I may have options on. One is supposed to have been rebuilt at some point and due to there being no numbers on the box or TC this looks like it could be true. Guessing a later TC has been attached to an early box.

So, still have some questions - which is better/stronger - an early box with no numbers or a suffix A series 3 box. I’m guessing the earlier box will have no synchro in 1st and 2nd whereas mine will, but what else should I be looking at? Current box is unknown although all gears did work, versus a potentially rebuilt (yet to be determined) earlier box? Will now going behind a 2.6 6 cylinder which will be fully rebuilt, and packing a few extra horses, although nothing big - hopefully around 100HP.

Hello All,

Just wondering if there were anything different that marks out a Suffix "E" box reputation wise?

I found an old thread by Lotz-a-Landies who wrote ...

The SIIa suffix D is actually the stronger boxes because of the change in the layshaft, where the circlip, retaining 2nd gear was removed and replaced with a shouldered layshaft.

The suffix B and later transfer boxes are more reliable than the Suffix a and SI/SII boxes because of the larger intermediate shaft diameter. The best low ratio crawler ratios are obtained by using a suffix c+ gearbox with a suffix B transfer ratio. Accessed 6th of February 2020 from, Series Gearbox ID

Are the suffix "E" any better worse or totally indifferent gearboxes when compared to a stronger "D" suffixed box?

Kind regards
Lionel

I don't know the answer to that!