How to differentiate 105 gearbox pinions ? - Alfa Romeo Bulletin Board & Forums
 
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post #1 of 5 (permalink) Old 10-11-2017, 01:34 AM Thread Starter
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How to differentiate 105 gearbox pinions ?

Hi there,

It's about gearbox of 105 serie.

I would like to know if the pniions are the same in 1600 - 1750 and 2000 gearbox from 1966 to 1973.

I suppose not, because the bearings in the 2000 are different from 1600 / 1750.

How can I be sure that the pinions I have are for a 2000 ?

I can post pictures if you tell me what you want to see.

Thank you for help.

Chris
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post #2 of 5 (permalink) Old 10-11-2017, 02:50 AM
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Bonjour Chris

I think you meant to say Input Shaft or Output Shaft for the gearbox

Pinion is in the rear axle - crownwheel and pinion or ring and pinion

From my experience 1300 / 1600 & 1750 are the same in the gearbox, but 2000 gearboxes used bigger shafts which meant different bearings and a different clutch plate. Unfortunately I cannot help you with identifying parts from pictures, I have no 2000 parts at all.

Salut
Greig
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post #3 of 5 (permalink) Old 10-11-2017, 07:15 AM
Richard Jemison
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Gearbox shafts

Both the main shaft and the lay shafts are the same in the 1966-1994 transmissions. Only bearings and their bearing races are different.

Easy to differentiate the older bearings from the newer (1974-1994) as the earlier have small ball bearings compared to the later roller bearings.
The rear housing (Tower) on the two are different to accept the larger bearings.

Richard Jemison
RJR Racing

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post #4 of 5 (permalink) Old 10-11-2017, 10:16 AM Thread Starter
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Thank you Greig and Alfar7.

I was talking about the "gear rings" and made a mistake when I translate "pignon" from french to english...

So, my question is : the "gear rings" are the same on 1600/1750 gearbox and 2000 ?

See picture 1, with the red arrows. (I know that in picture 1, synchro rings and synchro sleeves are not really correct...)

The layshaft is not the same on 2000 and 1600/1750. For evidence, the inside diameter of the front layshaft bearing is not the same.
25 mm on 1600/1750 and 20 mm on 2000. (picture 3 with a 1750 bearing)

But the gear rings seems to be the same for all gearboxes.. (see picture 2)

So, what about the gear rings for mainshaft ? Again thank you for your help
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post #5 of 5 (permalink) Old 10-11-2017, 01:23 PM
Richard Jemison
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Gears

Gears are the same on all the later trans that you mentioned (`66-`94) unless a "Jr fitment which has .86 5th not the std .79 fitment.
Either layshaft can be substituted if the bearings are on them.
Pic one is an early box which have the better syncros (FYI)

Richard Jemison
RJR Racing

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