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Big tyres on an auto

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22 Nov 2019 12:44 #215867 by Lccsw
Big tyres on an auto was created by Lccsw
Hi

Please excuse the newbie question.

I had read that a standard geared Jimny doesn’t really like running with tyres of 235/75/15 or above.

I just wondered if an early auto model (2001) would fair better with this or not? Does any one have any experience of this?

Not really looking to do serious off-roading with it .

Many thanks
Simon
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22 Nov 2019 16:37 #215874 by Lambert
Replied by Lambert on topic Big tyres on an auto
Welcome to the forum. The standard automatic will not like having big tyres any more than a clutch in a manual will. It will produce a massive amount of heat from the torque converter which will cook the transmission fluid and damage the solenoids. You would need to fit a lower geared transfer box and or differentials and run an upgraded or additional transmission cooler.

Dreadnaught (black 2011)
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24 Nov 2019 03:36 #215921 by zukebob
Replied by zukebob on topic Big tyres on an auto
A major plus one on your final comment Lambert. Additional cooling (along with monitoring temperature) aren't mentioned nearly enough when talking about the auto trans on the Jimny.

I started out with nothing & still have most of it left
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24 Nov 2019 18:10 #215936 by Lccsw
Replied by Lccsw on topic Big tyres on an auto
thanks guys, thought it would be the same case but wanted to check

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28 Nov 2019 07:40 #216036 by kirkynut
Replied by kirkynut on topic Big tyres on an auto
Even if you add additional gearbox fluid cooling, you're not really solving the problem of it being geared too high and all you're doing is helping it to cope.

You still need to address the gearing with a Rocklobster or lower gearset in the standard transfer box.

Why go to 235/75/15 if you aren't going to do any proper off roading?

Go 215/75/15 as a good compromise.

Kirkynut

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