f13 or f10 gearbox

[colebag]

as in the title i have got a f13 and a f10 box and was wondering what the diffrence is between the two and which ones best to put of a 1400sr engine

[mowgli]

either will fit. it all depends on gear ratios & diff ratio. clean them up & find the ratio stamps. they are a mix of numbers & letters, then we can help

[colebag]

right found a few stamps on them the f10 box are
90 334 344
f13 are
90 334 345
are these the right ones

[mk1nova_rich]

the only difference is the size of the bellhousing. The F13 is larger to accomodate the larger flywheel found on the 1.6 GTE/GSi engines and the 1.4 SRi

[mk1nova_rich]

right found a few stamps on them the f10 box are
90 334 344
f13 are
90 334 345
are these the right ones

no, its on the end of the gearbox, right along the bottom. Should start with C or W to specify wide or close ratio then 3 numbers. It is very small lettering and is stamped in, not part of the casting. For example C394 or W418. The numbers stand for the final drive used ie 4.18

[colebag]

right i got them now f10 is
c394
f13 is
w674
which do you think is best for my engine

[mk1nova_rich]

are you sure thats 674?

[mowgli]

i'd say f10.. the f13 if it really is a wr 3.74, you'll struggle to pull it down the rd.

[mk1nova_rich]

i would also say the F10 pal and i think you meant 374 not 674 lol

[colebag]

how come i would struggle would the f13 be to torque

[mk1nova_rich]

no, its a wide ratio and has a wide ratio final drive as well. Means its no good for acceleration as its suited for top speed

[mowgli]

an f13wr is basically a diesel box. it is simply too tall geared for a 1.4

[colebag]

cheers guys give you both some rep +

[mk1nova_rich]

cheers, you will have much more fun with the F10 :)