When you are sober.

Hi guys, happy new year, & when your headache has cleared I would welcome some advice. I live in S/W France, local motoring is conducted at less than 50mph (80kph),. I have a 300tdi classic 4hp22 auto box. Top gear lockup is at 85kph so most of the time is in 3rd gear. Now for the tech bit, can I put a 4hp22 box from a 3.9 v8 in my classic as I think lockup is around 45mph (70kph), & can I fit the larger TC at the same time? I can't remember if the starter motor is on the same side as the 300 tdi, any other bits I might need?
My box has done 95000km, mostly pulling a mobile machine shop up mountains & although it works fine when hot, takes 2km to change out of 1st gear when cold & slips out of gear on the overrun at 20kph so it's time for a change.
Any advice from the experts on here would be appreciated.

v8 box gear changes dont suit a tdi, the boxes are the same bar valve block t/c bell housing

Thanks, are all the gear change speeds different, or just the lockup speed. The lockup speed is what I want to get down to around 45mph.:brick:

other gears as well, lock up is the only driveable part with the tdis with v8 boxes ive driven

boxes are pressure controlled you may be able to use the 3.9 box your valve block and change lock up valve for v8 one

Right, Heres my two pence
I had a Mazda Bongo, Lock up was around 55MPH, I found a variable resistor on top of the auto gearbox, I turned it back, lockup was then around 42 - 45 mph
Not having had a landy auto I don't know if there would be a something similar

Now that sounds like a good option. I just have to decide whether to do it myself If I can find a good 2nd hand box or get Ashcroft to build me one, Cheers.

rover86 said:

Now that sounds like a good option. I just have to decide whether to do it myself If I can find a good 2nd hand box or get Ashcroft to build me one, Cheers.

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Update,, just got an answer from Dave Ashcroft who will build me a box using the V8 valve block and governor with a HD T/convertor, fitted for a very reasonable price. So sometime in the spring, when I'm back in the UK I'll get it fitted.

I know that these 'boxes can be adjusted for a different LU road-speed, mate of mine had his RRC adjusted from 50 to 45mph. Early 'classics' locked up at 40mph, mine does - very handy for rural driving!

early classics used the 3 speed torqueflite

are you sure you want v8 valve block if yours is 300tdi

jamesmartin said:

early classics used the 3 speed torqueflite

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Sorry James, senior moment I was referring to the ZF fitted from Oct '85