tale to 2 gearboxes

[kwd509]

ON my 64 rover in the earliest stages I have a gearbox (number 25191353C). Perhaps it is just fine despite 28 years sitting unattended. But I recently had the chance to buy a gearbox, though the previous owner thought it lacked reverse. But for $50 I figured I couldn't go wrong. The second gearbox is number 25276035D.
Can anyone easily advise as to whether they are they identical, or what differences they might have.
Thanks for any advise and thoughts.

Jay

[mongoswede]

ON my 64 rover in the earliest stages I have a gearbox (number 25191353C). Perhaps it is just fine despite 28 years sitting unattended. But I recently had the chance to buy a gearbox, though the previous owner thought it lacked reverse. But for $50 I figured I couldn't go wrong. The second gearbox is number 25276035D.
Can anyone easily advise as to whether they are they identical, or what differences they might have.
Thanks for any advise and thoughts.

Jay

if they are identical and you touch them together there will be an explosion that rips the very fabric of space and time apart....because as we all know the same matter cannot occupy the same time and space.

But seriously.....there were 2 different clutch mechanisms depending on whether its a series IIA or III. They are easy to tell apart because they are on opposite sides of the bell housing. The series III boxes had synchros, believe the II's and IIA's were not. for a whole bunch of good info check out Terriann's site here: http://www.expeditionlandrover.info/gear_ratio.htm

[kwd509]

Thank you Mongoswede, and happy mud season.
Teriann's pages were just what I needed. I am quite pretty sure they are identical, and her pages confirm that (notwithstanding your warnings on the time space continuum). Rovers enter another dimension.

The question came up when it seemed from the parts manual that within the 2 and 2a there seem to be different trans brake assembly (or maybe even within the 2a). It got me questioning the potential value of this spare gearbox.
But I think it will be fine.

[disco2hse]

if they are identical and you touch them together there will be an explosion that rips the very fabric of space and time apart....because as we all know the same matter cannot occupy the same time and space.

if gearbox1 is the same as gearbox2,
then gearbox1 is gearbox2,
therefore gearbox1 occupies the same space as gearbox2

so space and time are safe, for now.

however...

if gearbox1 is not the same as gearbox2,
then gearbox1 is not greabox2
therefore any attempt to make gearbox1 occupy the same space as gearbox2 will be.... oily

and the local space will be messy, and time will be lost.

[disco2hse]

I know. I should be working

[I Leak Oil]

Sounds like you have a suffix C IIa box and a suffix D IIa box. The main differences being the layshaft and it's associated parts. They are not the same but IIRC the suff C box can be made into a suff D box by using the D layshaft and bearings. I think the case need to be modified to do so. It's been a while since I looked at this so I'm a little fuzzy on the specifics. Given a choice, always go with the higher letter suffix box.

[kwd509]

Shifting gears a bit

Sounds like you have a suffix C IIa box and a suffix D IIa box. The main differences being the layshaft and it's associated parts. They are not the same but IIRC the suff C box can be made into a suff D box by using the D layshaft and bearings. I think the case need to be modified to do so. It's been a while since I looked at this so I'm a little fuzzy on the specifics. Given a choice, always go with the higher letter suffix box.

That's the sort of info I was looking for, and it is detailed too. Thanks. though it doesn't exactly comport with what in took from the terrann page mongoswede referred me to.....I think it is time for some detailed review of the part manual.......

Now, for two gearboxes that have sat for some time, is there some assessment/diagnostic process that can tell me what I've got in terms of function, Before I put the vehicle back together (getting ahead of myself), and then find I have to go back to deal with gearbox issues? Or is there some sort of restorative procedure ( or incantation) that can maximize my prospects for a functioning gearbox?

[bmohan55]

Or is there some sort of restorative procedure ( or incantation) that can maximize my prospects for a functioning gearbox?

Geting back to the space-time continuum process one can use Einstein's famous equation E=mc2 where:

E is Energy exerted on restoration
m is Money spent on said restortion
c2 is cursing done during said restoration

this is applicable up to the speed of light, but I suggest you also upgrade your brakes before going there...

[I Leak Oil]

Your best bet to know what you've got is to open them up and get your hands dirty. Look at the gear teeth, check the bearings, check the splines on all the shafts, check end play etc. Series boxes are relatively sloppy so checking them by feel will only get you so far. Sorry but unlike the lucas electrics there is no incantation or tribal dance you can do to fix the gearbox.

[I Leak Oil]

That's the sort of info I was looking for, and it is detailed too. Thanks. though it doesn't exactly comport with what in took from the terrann page mongoswede referred me to.....I think it is time for some detailed review of the part manual.......

Ya, like I said, I'm a little fuzzy on the detail as it's been a while. Could very well be that it's the gear that I'm thinking of that needs to be machined instead of the casing, or both. Certainly a good idea to look at the parts manual to see what parts are different. Don't be afraid to work on them, they're really not complicated.

[kwd509]

Thanks,
Encouraging, informative and thought provoking responses.
All suggesting getting hands dirty and making local mess.