Vehicle & Technical > Range Rover

gearing for RRC Auto

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ukmudmaster:
Been offered some 33"x12, 1/2"x 15" Khumo tyres for my RRC 3.9 Auto. I know I will have to something with the gearing, but what?
Does a Defender transfer fit onto a ZF 4 speed?
Any ideas welcome,
Thanks,
Dave

paulmmc:
I ran 33x12.5x15 on a standard series 3 for abour 3 years with no problems at all, cruised faster and lost some acceleration but nothing to worry about, still regularly did some hard stuff off road. My main concern was damaging the half-shafts but never became a problem.
Obviously the turning circle becomes even worse and needed to modify the wheel arches, personally i wouln't have thought a 3.9 V8 would notice the difference drive-wise.

dod51e:
I run 255 85 16's (about 33") with no problem on a 3.9 RRC.  As stated the turning cicle suffers abit (not that it was great in the first place!!).  Slight reduction in acceleration but nothing to worry about..... 2" lift sorts most clearance issues.

Bowie:
Gearing and autobox changes will be all to pot tbh, making it very unpleasant to drive on the road. Changing the transfer box to a defender 1.4 item restores it to about stock gearing, and it drives SOOOOO much better again -I have not long ago done this swap and it transformed the vehicle.

Low range is unaffected of course, but a set of lower ratio ring and pinions would sort this out, and you wouldn't need to change transfer box of course ;)

hairyasswelder:

--- Quote from: Bowie on June 09, 2010, 09:04:41 ---Gearing and autobox changes will be all to pot tbh, making it very unpleasant to drive on the road. Changing the transfer box to a defender 1.4 item restores it to about stock gearing, and it drives SOOOOO much better again -I have not long ago done this swap and it transformed the vehicle.

Low range is unaffected of course, but a set of lower ratio ring and pinions would sort this out, and you wouldn't need to change transfer box of course ;)

--- End quote ---

Mine is similar with 265 insa turbo's (33") and loses all power up hills at cruising speed, just below 60.  I have a defender t-box with a broken centre diff.  would it be possible to build a hybrid t-box.

Mine is a V8 3.5 ZF auto with manual diff lock, lt230??

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