SS1 Gearbox ratios

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nickp
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SS1 Gearbox ratios

Post by nickp » Wed Jun 12, 2019 11:36 am

Having covered 600 miles last weekend I now know my speedo is over reading by a comfortable 10%+. 70mph reading is actually about 62mph. I'm on original steel wheels with the correct tyre size (I would mention the size but I cant remember right now).

1400 engine with 4 speed box. in top from memory 3500 revs give me 60mph on the speedo or about 54 in reality.

Should i suspect a non original box with the wrong final drive ratios? I hit 4th gear by about 20mph (actually thats probably 17mph!) and rarely have to change down!

Is there any one who can tell me what the revs should be at a given speed?

Thanks



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Post by peter freeman » Wed Jun 12, 2019 11:43 am

I fitted a five speed box in our 1400 - well worth doing rather than trying to figure out if your ratios might or might not be wrong.



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Post by scimjim » Wed Jun 12, 2019 12:17 pm

Sounds about right to me - the type E ratios are 3.58, 2.01, 1.4 & 1:1 which, with the standard wheels, tyres and 3.92 diff gives 4.68, 8.33, 11.96 and 16.75 mph per 1000 rpm.

The type 9 is 3.65, 1.97, 1.37, 1and 0.82:1 giving 4.6, 8.52, 12.25, 16.78 and most importantly, 20.47 per 1000 rpm in 5th.


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Post by reliant-reviver » Wed Jun 12, 2019 12:54 pm

ss1 ford gearbox comparison.JPG
ss1 ford gearbox comparison.JPG (31.96 KiB) Viewed 818 times
Find a Type 9, 1600 prop (or just front yoke), speedo cable and gearbox mounting bracket and get swapping if you need that extra gear!

Or a 3.6:1 final drive in place of the original 3.9 (all ss1)


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Post by Alan SS1 » Wed Jun 12, 2019 1:00 pm

reliant-reviver wrote:
Wed Jun 12, 2019 12:54 pm
ss1 ford gearbox comparison.JPG
damn, that means that the gearbox i have stored under freezer for last umpteen years is a four speed unit :cry: (correct spline size)

I got it FoC without a gearlever and 'looked' similar , so thought nothing of it. . .. .

so if can confirm it is a four speed unit it will be available for anybody to take away !!! (SWAMBO will be happy)


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nickp
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SS1 Gearbox ratios

Post by nickp » Wed Jun 12, 2019 1:58 pm

You lot are great thank you.

I'll just ignore the over reading speedo and pretend I'm driving fast!

I still have a donor car with a 1600 and a 5 speed box in it. Not even tried the engine ( neither did the previous owner). I could do the whole thing or just the gearbox. Sounds like a summer challenge.

It really does need the 5th gear on the motorway!

Nick



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Post by Roger Pennington » Wed Jun 12, 2019 2:28 pm

If you've got a 5-speed donor, then I'd definitely be planning on a change. Whether to change the engine as well is more questionablee, given that your existing one is running well by the sound of it, and the other one sounds a bit of an unknown? Your existing engine should have a tax advantage too, I think?


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Post by philhoward » Wed Jun 12, 2019 2:29 pm

Alan SS1 wrote:
Wed Jun 12, 2019 1:00 pm
damn, that means that the gearbox i have stored under freezer for last umpteen years is a four speed unit (correct spline size)
Depends - but the type 9 is quite easily identifiable by the amount of aluminium housing behind the iron case. A picture will tell a thousand words..


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Post by peter freeman » Wed Jun 12, 2019 2:37 pm

As I recall you need to change the speedo cable as well as the 5 speed box has its output further back and the rear GB mount is further back - I just "modified" the existing mount to fit it further back between the chassis boxes. There are two types of 5 speed box the one you want ( and is more than likely the spare you have ) has its input shaft the same length as the 4 speed box -the other type has a longer shaft which sticks out of the bell housing more



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Post by Alan SS1 » Thu Jun 13, 2019 1:15 pm

philhoward wrote:
Wed Jun 12, 2019 2:29 pm
Alan SS1 wrote:
Wed Jun 12, 2019 1:00 pm
damn, that means that the gearbox i have stored under freezer for last umpteen years is a four speed unit (correct spline size)
Depends - but the type 9 is quite easily identifiable by the amount of aluminium housing behind the iron case. A picture will tell a thousand words..
that means digging it out again :wink:

what iron, I (stupidly) dumped the bell housing .. . . . :(

OK photo required (and i'll see if I can find some reference numbers)


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Post by reliant-reviver » Thu Jun 13, 2019 3:29 pm

Even if it's a type E 4spd they are still worth good money to the ford boys, rally escorts etc don't really need the 5th gear!


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