26 replies to this topic

[daniel_johno]

I know of someone selling a jack knight SC/CR gear box minus the diff which is he believes an A series not A+. Is it possible to interchange gear boxes? Or once i strip my turbo engine down just put the jack knight gear set into the A+ gear box?

Thanks for looking

Dan

[The Matt]

Yer best man to answer this will be Guessworks!

But, I have been told that the A plus is a stronger box for starters. The other thing with trying to use the A series gears in an A+ box is that I think a couple of the parts are different sizes (the idler gear is different and I think the layshaft is different).

You can however use an A plus box on an A series, or visa versa.

[chairchild]

AFAIK, the A-series use a better quality material, but the A+ plus ones have a superior design - but with worse quality materials, to make them cheaper to produce! The only reason for the better design, was to make up for the lack of strength in the materials to be used

The same goes for the A+ idler - it's larger, so they could use a lower quality metal - but the bearing's ARE better AFAIK



to use an pre A+, on an A+ engine - just use an A-series idler, and transfer case. Or get the idler hole in the gearbox machined larger to suit the A+ idler bearings

[icklemini]

to use an pre A+, on an A+ engine - just use an A-series idler, and transfer case

You would need to use all pre A+ drop gears as the A-series idler has a different tooth profile to an A+ primary and input gear.

TTFN,
Dave

[icklemini]

I know of someone selling a jack knight SC/CR gear box minus the diff which is he believes an A series not A+. Is it possible to interchange gear boxes?

Well the only difference here will be that the idler is the 'small bearing' type as the rest of the gear set would have been replaced...

could use all A-series drop gears, or go roller drop gear route

TTFN,
Dave

[daniel_johno]

bought the gears but they are in an autobox A series box so will need puttin in a manual box.

I cant put just the gear set in the A+ box i have tho can i? is there anyway of converting the gears to have them fit?

Cheers for the responses

Dan

[Dan]

What? A manual gearset in an autobox? I think you've been ripped off there mate.

[icklemini]

bought the gears but they are in an autobox A series box so will need puttin in a manual box.

er, check again - you wont get manual gears in an auto box...

I cant put just the gear set in the A+ box i have tho can i? is there anyway of converting the gears to have them fit?

Depends on what exactly you have - the gearsets themselves are pretty universal with the odd bit of swopping needed regarding shafts for example..

TTFN,
Dave

[Guess-Works.com]

You can put the A series gears into an A+ box, but only realy worth doing if the A+ box had onl3 3 bolts retaining the 3rd motion bearing retainer, or you wish to change to using a A+ idler. Everything else will fit...

If you want the best of both worlds, what you need to get hold of is a set of the newer GT Gears, or early A+ gears which have the A series profile ( slighty chunkier than the A+ and less helical in profile ) but have the A+ 18mm nose bearing on the 3rd motion shaft.

[Dan]

Unless the A series box you have is so old that it's a three synchro set in which case it can't be adapted to anything and the 'box will only fit the size of engine it was designed for.

[daniel_johno]

er, check again - you wont get manual gears in an auto box...

TTFN,
Dave

are you sure?

Can you get straight cut automatic gears? as the gears are definantly stright cut but i was told in an autobox so now a little confused. The box looks a little modified with bits grinded off it here there and everywhere. Ill try get some pics and post them.

Dan

[Guess-Works.com]

If it looks like an ordinary mini box then it's manual, if it looks like a square block with lots of oil channels it's automatic... the two are fairly distinguisable...

with bits ground off etc, it may have been stress relieved, but more likely butchered..

Photo's would be good !

We're all a little intrigued...

ps... you look for anything to do with automatic on Minispares, and I'll think you'll be lucky to find a gasket...

[daniel_johno]

im tryin to post pictures but it wont let me , im hosting them on muchos is that a problem?

Dan

[Guess-Works.com]

Email them to me an I'll post

[Guess-Works.com]

Pics... no.1