Best F13 combo

[_Jake]

Evening, Currently building a fast 1300s engine for me mk1 so ive decided i want to build a gearbox to suit rather sticking it on my wide ratio 4 speed thats currently in the car :tard:. From some research ive gathered that the best combination to get the most out of the engine would be a F13CR cluster with a 4.18:1 cwp ? Im more interested in accleration than top end If this helps any.

I have 3 f10 boxes here:
1 from my mk2 with a 14nv engine (5speed)
1 in the car at the moment (4speed)
1 from the astra i took the 1300 from (5speed)

Ive read somewhere that the astra box will have the 4.18cwp in it, or would it just be the same box as the one from my mk2 with the 3.94:1 cwp? Any help/advice appreciated :)

[Stuart]

Unfortunately you need to count the teeth. Even the end plate stamps arent 100% reliable.

F13CR with 4.18 or higher is the ideal though :)

[brucer]

im currently changing the final drive (4.18) to my f13, to say the small pinion gear is stuck would be an understatement! the f13 one pulled straight off, will be attempting to press it off on monday.

[Stuart]

lol been there many times :(

We left the puller on for a day and kept using freeze spray and some heat to try and shock it off etc. They eventually come off :)

[Novasport]

I was told by a friend that works at Vauxhall that the pinion gear on later F13's are part of the shaft

[Lewis.]

/\ this is correct, which always leads to amusement when people try and pull them off lol

[garyc]

Isnt it the F15's which have the pinion as part of the shaft?

[Novasport]

F15's and later F13's

[Stuart]

Early F15's have separate pinons like the 'early' (nova era) F13s' :)

[brucer]

lol been there many times :(

We left the puller on for a day and kept using freeze spray and some heat to try and shock it off etc. They eventually come off :)


i had a puller zapped up with an air gun and got the whole thing red hot, it moved a bit. i gave up as i wanted to eat my lunch. :)

monday ill get the little sxxt. it just had to be the pinion that i need to keep and not the scrap one.

[mowgli]

i've always managed to get pinion gears off really easily with a sykes puller set. i must have been lucky