Reply With QuoteIve definitely thought about this myself too, The limit im hitting is the rear axle one, and 5 vs 7 seaters have different limits, yet there's no mention of different parts between these seat versions afaik ....
Fossicker
SupporterHi
I am looking seriously at doing a GVM upgrade on my 2007 Range Rover Sport TDV8. The main basis for this will be demonstrating that the rear suspension components are the same as the Discovery which has a greater rear axle weight capacity and then presenting this in an engineering report to the department of transport for approval. I have been able to do this for the majority of components by comparing part numbers between the 2 models, however have got stuck on the rear control arms, both upper and lower, which are not the same part number.
Does anyone know:
1. Are there any physical differences between the RRS and Discovery 3/4 rear control arms
2. Are they interchangeable, even if there are identifiable differences - i.e. do they share the same geometry.
Wizard
SupporterIve definitely thought about this myself too, The limit im hitting is the rear axle one, and 5 vs 7 seaters have different limits, yet there's no mention of different parts between these seat versions afaik ....
Swaggie
The RRS may have firmer rear suspension bushes as it does for the front for tighter cornering control, which would make for different complete arm part numbers.
Look into armoured D3/D4 parts too as they should have firmer bushes so might be the same as the RRS.
MY21.5 L405 D350 Vogue SE with 19s. Produce LLAMS for LR/RR, Jeep GC/Dodge Ram
VK2HFG and APRS W1 digi, RTK base station using LoRa
Fossicker
SupporterYes, this was my thoughts too and is true for the upper arm, but the lower arm has the same bushes yet a different part number.Originally Posted by Graeme
The rear control arm part numbers on the armoured D3/D4 match the standard D3/D4.
Fossicker
SupporterYes, there seems to be no rhyme or reason behind the axle and GVM limits Land Rover has placed on these vehicles.
Swaggie
Have you considered tyre differences, particularly the load index?
MY21.5 L405 D350 Vogue SE with 19s. Produce LLAMS for LR/RR, Jeep GC/Dodge Ram
VK2HFG and APRS W1 digi, RTK base station using LoRa
ChatterBox
Could you just swap in the "higher rated" D4 arms in to the RRS then? Even if they are the same, at least they are "rated" higher for GVM purposes...
Chris
OldBushie
The common D4 upgrade is RRS armsOnly difference is the bushings - So for engineering purposes neither could be identified on vehicle.
Fossicker
SupporterYes I have - depending on how far I go with it it could get problematic. I will most likely limit my rear axle load to the limit of 111 load index tyres (2 x 1090kg) which seem to be readily available. I am stuck with 19" or larger rims to clear the Brembo brakes and heavy duty tires above 111 load index in 19" or 20" seem to have very limited options.
Fossicker
SupporterHi Chris - yes, that is the fallback if I can't prove equivalency. And also one of my questions - to confirm that they are in fact interchangeable.
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