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Old 27-04-2018, 02:14 PM   #1
AGoaty
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Default Ideal gearbox for use with conversions?

Doing a bit of research into gearbox ratios. I came across the the Land Rover Freelander 1.8 petrol, PG1 gearbox having a S4 ratio set.

Put the numbers into the calculator and found that it's an ideal box for us who are converting to small wheels. In particular it looks to be straight swap box.



+++EDIT+++ It's not a straight swap. See post 13.



It has a 5th gear similar (very slightly higher) to the C7 ratio boxes that quite a few on here have made but mean custom building from 4 different, hard to find boxes.

Has anyone tried this or even considered it?
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Old 27-04-2018, 03:00 PM   #2
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yes i have looked into this, the only problem is that with the 4.2 fd first and second are very short- 1st would be useless then the gap from 2nd to 3rd would be a bit big. I've tried the S ratios with a 3.9 fd (on 13"wheels) and found the gap between gears to big. using the 3.6 fd is the best way to get useable 1st and 2nd with a nice spread of gears (using a C gearset) on 10" wheels or 3.9fd on 13" wheels.
Depends what you want really, if you want a nice road cruiser then an C6 or C7 with S 4th and 5th would be good (but performance wouldn't be great in 5th) or a reasonable road car with occasional track use and good all-round performance would be a c6 (13"wheels) or c7 - the c6 being a standard mgf non-vvc box so plentiful and 'off the shelf'
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Old 27-04-2018, 03:04 PM   #3
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by the way the mk1 freelander 2.0 diesel uses an S7 box which has the 3.6 fd, and the mg zs 180 (v6) has a C4 - u spec so has all the other bits needed to build a C7 box so only 2 boxes are needed
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Old 27-04-2018, 03:48 PM   #4
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incidentally I enquired recently about getting a 3.3/3.4 fd made up but would need a group buy of at lease 4 to make it possible. This could be made to non-u spec so would drop straight in to the mgf box
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Old 27-04-2018, 03:54 PM   #5
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Quote:
Originally Posted by gazwad View Post
by the way the mk1 freelander 2.0 diesel uses an S7 box which has the 3.6 fd, and the mg zs 180 (v6) has a C4 - u spec so has all the other bits needed to build a C7 box so only 2 boxes are needed
I cannot believe you have said this Gaz. Both those boxes do not fit the petrol engine so you need at least one more box to get the bellhousing!

Also the ZS 180 is a C6 not a C4. So only 3 boxes needed then.

I realise the S4 is non U spec. That said, I have not heard of any other than diff bearings going in any of these boxes.

I posted it as a simple alternative to anyone wanting a longer gear range, without having to strip and rebuild the box it'self.
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Old 27-04-2018, 04:16 PM   #6
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I think the freelander diesel box actually uses the same bellhousing as the k series so you only need the 2 boxes. The s7 diesel freelander box i used has a k series bellhousing anyway.
you're right the 180 is a C4 but that doesn't matter as you only need the C gearset. You would need the U gearset as the S7 fd is U spec so only a U spec C 5th will fit it. The U spec isn't really needed unless huge power is going through it, it's simply needed to fit.

and S4 box would be good on the motorway but like I said 1st and second would be annoyingly short and the gap between the gears is not ideal so would still be a bit of a compromise.
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Old 27-04-2018, 05:00 PM   #7
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I broke a S7 box for the 3.6fd. It's a L series diesel. It certainly will not fit.

You say annoying low, but the gears 1,2 and final drive are exactly what I am currently running.
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Old 27-04-2018, 05:45 PM   #8
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that's strange, the s7 diesel freelander bellhousing I got is currently on my vvc engine! maybe my box had been swapped around before i got it but seems strange.. I would have thought it would be the normal L series housing.
1 and 2 might not be so bad on your 13" wheels but they would be too short on 10's
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Old 27-04-2018, 05:52 PM   #9
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out of interest what rpm is yours at 70mph in 5th?
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Old 27-04-2018, 07:56 PM   #10
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In Phoenix on 175 50 13's it's 3800rpm. When I built it at first, I had the G4 box! That's 4200rpm.

I swapped to the S6 which was great on normal or fast road, inc motorway use, but hurt the acceleration. I bought the C4 box with Quaife and just fit it as it was. It's much quicker acceleration but is not good on motorway journeys. It does help you stick to the 70mph speed limit!
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Old 27-04-2018, 08:50 PM   #11
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ah that's not too bad then, 4200 is a bit much though!
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Old 28-04-2018, 10:04 AM   #12
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This shows what the "annoying short" gears are like.



I genuinely think the S4 box would suit most people who do these conversions.
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Old 28-07-2018, 03:32 PM   #13
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I decided I would invest in the Freelander S4 box for my project Scorpion. It uses MG F driveshafts and CV's. It won't fit due to the Freelander has a transfer box bolted to the side of the gearbox and uses a much bigger splined shaft where I want to put a CV in.

I could potentially swap the diff but the idea of this was to use a box without doing a rebuild.
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