Identifying L series gearboxes, 3.9 or 3.7?

tommo · Post by **tommo** » Mon Jan 12, 2009 9:44 pm

I have a question about L series manual gearboxes. I was wondering if there's any way of telling what ratio they are from the outside? (assuming they haven't been tinkered with) Any markings? Particular models the 3.7s and 3.9s came on?
One way I've just thought of would be that the rear diff sometimes has a sticker on it saying what it is.
Also, in case you didn't see my wanted thread I'm looking for a 3.9 box to replace mine that these bits came out of yesterday...

Cheers,
tommo.

mattims · Post by **mattims** » Tue Jan 13, 2009 12:06 am

there was a match in your gearbox?? no wonder it broke..

jokes..

CPOCSM · Post by **CPOCSM** » Tue Jan 13, 2009 3:18 pm

Groan!!!

Someone had to say it though - piss funny!!!

Post by **Captain Obvious** » Tue Jan 13, 2009 4:53 pm

pretty sure if you mark the crown wheel and then turn it and count the teeth you will work out what ratio it is, or it may be marked on the crown wheel.

bryan

r00fi · Post by **r00fi** » Fri Jan 16, 2009 11:15 am

Take the oil drain plug out, mark a tooth with liquid paper and count teeth. From memory it's either 37 or 39

If you search the forums, there are a number of threads on the subject to confirm the numbers.

Callum89 · Post by **Callum89** » Mon Jan 19, 2009 2:27 pm

Is it possible to tell if a gearbox is a 3.7 or a 3.9 from the number of plines on the gearbox input shaft? My gearbox has 24 splines and the diameter is 24mm.

AndrewT · Post by **AndrewT** » Mon Jan 19, 2009 3:08 pm

Callum89 wrote:Is it possible to tell if a gearbox is a 3.7 or a 3.9 from the number of plines on the gearbox input shaft? My gearbox has 24 splines and the diameter is 24mm.

No, input shaft is the same regardless...

Callum89 · Post by **Callum89** » Mon Jan 19, 2009 3:33 pm

lol dam ok then.