gearbox casings 3 synchro

[agricola]

The last and heaviest duty 3 synchro casing seems to be the 22A1522 and the 22A1288 I presume these casings came into being just prior to the 4 synchro so is that 1967? Both will allow clearance on a 1300 block and are beefier than a 333 casing. So is there a difference? or if you believe all the crib sheets:- was the 1288 used on coopers with rubber joints, and the 1522 on S with hardy Spicers. Seems strange to have a different casting number for 2 very similar boxes with the difference being different output joints or am I missing something.

Perhaps some good person should produce a guide not on there uses but the mechanical and machined difference?

I suppose it is now a problem as collectors want the right box: where as in period straight cut race and rally (and tuned road cars) boxes were built in a variety of boxes using the strongest casings people could lay there hands on little realising 50 years latter the consequences! Of course when the 4 speed synchro was introduced most changed over to that, once straight cuts were available.

The other interesting thing is these heavier casings came in about the time Cooper S blocks went from thin flange to thick flange so presumably experience had necessitated an upgrade in strength?

[cmiller]

This should help muddy the waters. I have a MK 2 1275 Cooper 'S' with a build date of December 7, 1967. I know it to be original as the original owner is a good friend of mine. It has the 1288 box with Hardy Spicers and is a North American export car. It has a 3.44 final drive. Go figure.

I think the factory fitted what ever was at hand when the car was built. Either a 1288 or a 1522. Only thing I can think of.


Chris Miller

[Spider]

The little bit of info I have is that the 1288 was fitted with B gears and used (at the time it was released) on all models except for the Cooper S. I think this also includes the ADO16 range too, but not sure.

The 1522 was used from when it was released on all models, including the Cooper S. It was also the last of 3 Syncho Cases.

[360gts]

As with many of the changes that occurred late in the MK1 production....saw one Sept 67 built MK1 S with the 1288 box and HS shafts.
It is difficult to say if this was original or not however, it is possible as we have seen other cross over parts on the very late MK1 cars.
Case in point...the MK2 style rear quarter windows for one.

[agricola]

I apologies for posting in wrong section.

Have we a view on any mechanical differences between the 2 casings Seems strange to have two almost identical castings!? Both seem to have clearance to take a 1275. From this it seems they did have cooper vertical bolt type remotes not the 1100/1300 horizontal remotes.

[iain1967s]

It could be as simple as primary and second source suppliers for the castings, each having their own part number

[TECH396]

This should help muddy the waters. I have a MK 2 1275 Cooper 'S' with a build date of December 7, 1967. I know it to be original as the original owner is a good friend of mine. It has the 1288 box with Hardy Spicers and is a North American export car. It has a 3.44 final drive. Go figure.

I think the factory fitted what ever was at hand when the car was built. Either a 1288 or a 1522. Only thing I can think of.


Chris Miller

I know this is an older thread, but thought I'd throw in my observation on the 1288 and 1522 gearboxes. I have a MK 2 1275S built April 1968, or the North American (Canadian) market The car has all it's original parts, and also has the 1288 Gearbox with Hardy Spicer Diff and C/R gear set with a 3:44 diff. It seems more likely (now that I know I'm not the only one) that these boxes were indeed used for the "S"s. At least here in Canada.

[abri]

I've got a 1275S engine here in Cape Town, South Africa that I pulled out of a 997 with unknown history. It's got the 1288 box with HS diff.

[agricola]

1275 s when used spiritedly were heavy on gearboxes, particularly 3 sychros so although nobody wants to admit it shock horror S were fitted with exchange boxes mine was . The service exchange system would introduce new compatible casings as not all exchanged units were serviceable. Once 4 sychros were introduced and in particular the straight cut gear sets 4 sychros became choice. If you went to look at an S with a 4 synchro the chances are its trying to be honest instead of a classic??

[Dearg1275]

The difference between the 22A1128 and the last 3synchro case 22A1522 relates to the idler gear bearing. The 22A1522 uses the larger diameter bearing as used on the 4synchro boxes and the bearing is positioned in the same way back from the thrust face. This means that it has to have the unequal shaft idler gear. Nothing to do with the diff outputs or which cars it was going in.

D

[360gts]

This should help muddy the waters. I have a MK 2 1275 Cooper 'S' with a build date of December 7, 1967. I know it to be original as the original owner is a good friend of mine. It has the 1288 box with Hardy Spicers and is a North American export car. It has a 3.44 final drive. Go figure.

I think the factory fitted what ever was at hand when the car was built. Either a 1288 or a 1522. Only thing I can think of.


Chris Miller

I know this is an older thread, but thought I'd throw in my observation on the 1288 and 1522 gearboxes. I have a MK 2 1275S built April 1968, or the North American (Canadian) market The car has all it's original parts, and also has the 1288 Gearbox with Hardy Spicer Diff and C/R gear set with a 3:44 diff. It seems more likely (now that I know I'm not the only one) that these boxes were indeed used for the "S"s. At least here in Canada.

Once again, a gray area of when the MK 1 was ending. and the MK 2 was starting up. We have seen MK1's with some MK2 items....I own a late Sept 67 MK 1 S. American export...it has the 1522 box.... 22g232 laygear set and HD couplings. I would hazard to say the MK 2 had the 4 syncro 1288 box from the early MK 2 production.

[Dearg1275]

My December 1967 built Mk2 has a 22A1288 Hardy Spicer output 3 synchro box with correct S ratios ( before it received straight cuts that is).

D