alternative diff ratio for 850 gearbox-help!

[slim4936]

Can anyone give some advice on lower final drive  ratio (approx  4.3) for the 850 gearbox.This is for 1000cc motor so 8/35,9//39 would be ideal.If you are looking for one yourself then please contact Paul from www.scuderiatopolino.com and leave a message on the forum.We are trying to find "expressions of interest" with a view to fabricating some new sets but are not sure if there is any demand.

Cheers,Toby

[viotti600]

This subject has already been posted for discussion on this forum by Paul himself:

http://www.abarth-gmr.be/forum/index.php/topic,2287.0.html

[slim4936]

Hey Viotti600,

I am not Paul!
I am Toby!
I am trying to drum up ANY information I can about this so please offer advice to the question or don't post at all!

Toby.

[viotti600]

Hey Viotti600,
I am not Paul! I am Toby!

  I never said you (Toby) were Paul. I said that PAUL has already posted information here on this very item you are asking about (see the link I referred to above). PAUL asked for comments, and the most logical place for someone to add/post comments (or ask for more information) on the topic would be on THAT particular thread. Quite simple, no worries!

I am trying to drum up ANY information I can about this so please offer advice to the question or don't post at all!

Toby.

What more "information" or "advice" about these parts do you need??? You haven't asked for anything in particular, even across the 3 different forums that you've posted this to so far (2 of those where I DID offer pertinent info to you). If you want certain info, you need to ask specific questions. So far, all you've done is ask for no particular info/advice, at the same time telling people to contact Paul for these parts.

NOTE: WE ALREADY KNOW TO CONTACT PAUL FOR THESE PARTS BECAUSE HE ALREADY POSTED ABOUT THEM HERE A FEW DAYS AGO.

Either ask us what it is you want to know "...or don't post at all". ;)

Cheers,
-JS.

[slim4936]

J.S,
Sorry, maybe we're getting off on the wrong foot here.I'm desperate to find a solution to my problem, I've been trying to find something for a long time now.I thought by posting in" parts wanted" it might reach another audience.Surely there are other 850 owners out there who might like the sound of Paul's proposal?
I'm frustrated that I can actually have this part made but need another 9 people to join in the venture.Then I get more frustrated getting replys from people who give advice and offer opinon but can't actually help me, so sorry again I know you are trying to help and I thankyou for your efforts thus far.

Cheers, Toby

[batman]

Toby, Give Middle Barton Garage a call, there in the UK. they have gear sets knocked up from time to time, thats were I had mine fitted regards Dave.

[guy moerenhout]

hallo boys ,you can always fit a Simca 1000 gearbox inside ? great chose  ,cheap and even 1000 rpm change .Only km counter sits more to the right

[batman]

The last time I saw a Simca 1000 in a scrapyard was in Coventry in 1975!. ---Its now 2008, there must be lots of  easier and more reliable solutions nowadays than using all that old stuff.

[guy moerenhout]

mayby you dont look well,I have min 4 in stock and its also Fiat ,.So don't say so fast "more reliable""

[slim4936]

Hi Dave & Guy,
Will the Simca 1000 crown wheel & pinion fit into the 850 gearbox without modification?

Cheers,Toby.

[guy moerenhout]

the gearbox house you can fit on the bellhousig from a fiat 850 gearbox ;You can even adapt the cardans on your car .There are differenet gearbox ,old type,rally 1 ,1000 special and the 1000 rpm gearbox from a rally 3

[viotti600]

Will the Simca 1000 crown wheel & pinion fit into the 850 gearbox without modification?

Yes, the Simca 1000 ring & pinion can be installed in the 850 gearbox. The large retainer nut will hang off the end of the pinion shaft a little more than with the 850 ring & pinion, but it does not cause any problems. Be sure to use the Simca speedo drive gear, as well.

-JS.

[slim4936]

Is the speedo drive the tiny little pinion on the end of the pinion shaft?

[viotti600]

Is the speedo drive the tiny little pinion on the end of the pinion shaft?

Yes. I think there is also a mated (plastic) gear that fits into the (nose) end cover of the transmission, like on the 850. This is the piece that physically drives (spins) the speedo cable.

-JS.

[slim4936]

Okay,I've found a 8/35 Crown wheel & pinion from a Simca 1000.The pinion shaft has a small metal pinion on the tip (like fiat part# 4104670).It seems to mesh okay with the plastic speedo gear (#4189859) but will my speedo read correct or does plastic gear need to match?

Cheers.