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diff ratio codes/ ID
doughie - 6/7/06 at 09:47 AM

hi all

wondering if anyone can tell me how to ID the D Ratio from the sierra VIN plate etc...

i know its there somewhere but cant remeber...???

bob - 6/7/06 at 10:03 AM

I'm pretty sure D = 3.92:1

Might be worth doing a search or trying the robin hood site as they did have a list.

bob - 6/7/06 at 10:05 AM

Sorry didnt read the thread proprerly,if you cant see it on the plate is there a tab bolted onto the diff back cover ?

Evidently the letter D should be stamped in box number 10 on the VIN plate, so i have just been told

[Edited on 6/7/06 by bob]

chockymonster - 6/7/06 at 10:20 AM

You can't rely on the Vin plate.
Models should have a certain diff, however ford seemed to run low at certain times and chuck any old diff in them.
I got a 3.14 diff from a 1600 petrol that the vin plate said had a 3.62
The only reliable way to find the diff is either the tag on the back or by whipping the cover off as it's written on the crown wheel

doughie - 6/7/06 at 11:26 AM

cheers guys

will explore!!

what diff is the best for a BEC??

Kissy - 6/7/06 at 11:40 AM

Tell us what engine, 13" w/185-60x13: R1=3.14 or 3.38, CBR1000F (not RR)=3.14.

chockymonster - 6/7/06 at 12:31 PM

quote:
Originally posted by doughie
cheers guys

will explore!!

what diff is the best for a BEC??


Depends which engine.
If it's an R1 then you really want a 3.38 as the 3.14 is too low a ratio, it's more suited for 'busa engined cars

peterriley2 - 6/7/06 at 02:59 PM

theres thousands of posts on which is best, a current post can be seen here.