Series 2 Gearbox final drive

andyfreelandy · Sep 12, 2020

Has anyone fitted the Ashcroft Transmissions higher ratio final drive gears please?
If so, is it a job that can be done without special tools and does the box have to come out or can I do it from underneath and leave box in place. Thanks

tottot · Sep 12, 2020

Found out what diffs you have ? Not having had it long I would suggest you use it for a while before making any changes.

jamesmartin · Sep 12, 2020

andyfreelandy said:
Has anyone fitted the Ashcroft Transmissions higher ratio final drive gears please?
If so, is it a job that can be done without special tools and does the box have to come out or can I do it from underneath and leave box in place. Thanks

you need a modified case,and in any case it would need removing to fit the high gear on output shaft

andyfreelandy · Sep 12, 2020

Thanks, not sure on diffs, Ashcroft suggest you can mod the case but can't find details.
Top gear just seems very low, 50 miles on M5 proved that!

jamesmartin · Sep 12, 2020

andyfreelandy said:
Thanks, not sure on diffs, Ashcroft suggest you can mod the case but can't find details.
Top gear just seems very low, 50 miles on M5 proved that!

id try a 3.54 dif in the rear its an easy job and you can decide whether you like it or not before fitting another diff in the front
case mod is here
http://www.ashcroft-transmissions.co.uk/images/source/High_Ratio_Transfer_Case_Modification.pdf

cornish rattler · Sep 12, 2020

What engine, sounds like you have 2.25d engine so depending on what gearing you have and what size tyres you have I don't think a diesel will do much more.
If it's a 2.25p engine the same applies but should easily do 65-70.
It also depends what you are using it for, towing / carrying weight or off roading.
I am running a 2a swb with a 200tdi tweaked turbo and FIP, 3.54 diffs and an Ashcroft HRTC which I am about to swop out for a std tranny box as the gearing is far to high, I've tried swopping the rear diff with the original diff to pull the gearing down which it does but not enough so my plan is to keep the 3.54 diff and fit a std tranny box which should give me the gearing I want or as close as, hope this helps

Blackburn · Sep 13, 2020

I sent my transfer case to ashcroft to be modified they fill in the intermediate shaft holes then redrill in new lower location.
Instructions from there site downloaded awhile back.

Series 2 Gearbox final drive

andyfreelandy

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tottot

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jamesmartin

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andyfreelandy

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jamesmartin

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cornish rattler

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Blackburn

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