Vehicle & Technical > Defender

Diff ratios

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smo:
Diffs are 3.54 unless they have been changed, only way to check is pull them. As Dave A. says the T-Box is 1.4:1 unless thats been changed.

Jimbo:

--- Quote from: "smo" ---Diffs are 3.54 unless they have been changed, only way to check is pull them. As Dave A. says the T-Box is 1.4:1 unless thats been changed.
--- End quote ---


OK then, if we assume that the diffs are 3.54, and the t-box is a 1.4, and knowing that the truck pulls well up to 60mph.........what can be causing my lack of top end ? - could the ECU have been 'played' with to restrict top speed ?

Xtremeteam:

--- Quote from: "Tinks" ---All the diffs are 3.54:1 in coil sprung disco, RR & defenders except that is the disco 2.

Hope this helps!!  :wink:
--- End quote ---

disco 2's have 3.54 diffs :wink:

clbarclay:
I have a cunning plan :(scared):

What if you remove the front propshaft from the transphere case, apply the handbrake, stick the gearbox in 4th (1:1 ratio) and whalst someone else counts the number of turns on the front output of the transphere case, you turn the the engine over manually for a number of turns. The more turns you can bear to do this for the more accurate the result will be provided neither of you lose count. Marking both crankssft pully and transphere case output with a bit of paint would make it easier.

Knowing the number of turns of the of the engine (ecentially the number of turns of the transphere case input) for a number of turns of the transphere case output you can work out the ratio of the transphere case.

Because of the action of the diff and the lock rear output the number of turns of the front output would bave to be halved to get an accurate figure or altenitively chock the wheels, disconnect both propshafts from the transphere case and engaged the difflock. But this would mean more work.

stageonesimmo:

--- Quote from: "Jimbo" ---
--- Quote from: "smo" ---Diffs are 3.54 unless they have been changed, only way to check is pull them*. As Dave A. says the T-Box is 1.4:1 unless thats been changed.
--- End quote ---


OK then, if we assume that the diffs are 3.54, and the t-box is a 1.4, and knowing that the truck pulls well up to 60mph**.........what can be causing my lack of top end ? - could the ECU have been 'played' with to restrict top speed ?
--- End quote ---


*= Mmmmm, not necessarily - you can do a rough count of the turns on the prop and the wheel to work it out close enough to be able to tell the difference between a series diff and a latter one........

**= As torque is what gets you up to speed but horse power is what keeps you there, you may have something as daft as a lift pump on the way out that is only starting to show up at higher speeds by starving the engine just enough to slow it up high in the revs - friend of mine had a 200Tdi that was doing the same - it got gradually slower over a couple of weeks then it just refused to start - new lift pump and it fired up and was suddenly back to its old top speed again......

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