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1986 R22.. auto trans.

I changed my rear end gear from 4.10 to 4.56.. Helped tremendously w/ torque..  Could use a little more..

Tires 185/14/60 ...Thinking of going to 175, just on the rear wheels,  for a little more torque.
175s =  1/4" smaller side wall.. lowers the rear of the rig 1/2".. but I have air bag suspension.. so rear sits high now..

Anyone tried this..??
Here's the specs on difference;
https://www.discounttire.com/learn/tire-size-calculator?ef_id=XoIODAAABcN5zNtb:20200330151940:s

Edited by johnnyhap
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You currently have 185/60R14 fitted? That was the standard tire size & capacity for my 1984 VW Rabbit GTI. Good luck with that!

 

If you want a little more (safely), install 185R14 102/100 tires and a 4.88:1 or 5.29:1 differential.

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You definitely need the right tires and 185r14 is the right size. As far a those differentials the 4 banger needs to run at pretty high RPMs . That 5.29 diff is going to be way to high for it to handle. Going to end up stalling a lot. The 4.56 is probably the best. There's only so much torque you can get from a little tiny engine especially when it's pulling a house. We all just learn to deal with it

Linda S

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Wrong tires, wrong gear😝

185/60/14 tire.. capacity 1047 lbs (82) revs per mile 916. Most of these Toys weigh 4000lbs in the rear. With these tires you have 0 excess carry capacity in the event of a flat, what is your spare tire situation?

LT185/14/c...capacity 1850 lbs (102) revs per mile 809 this the correct tire

 IMHO  Because of the difference in automatic O/D ratios vs 5th gear of the manual transmission. The best choices are 4.88 for the auto and 4.56 for the 5 sp manual.

The 4 speed manual is best just left alone.

You have less than 100hp all the gears in the world aren't going to overcome that. What your trying to do is run down the road with the engine turning between the torque peak, 2800 rpm and the HP peak, 4800 rpm. Like around 3800 rpm.

There gear calculators on line that will let you try things

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On 3/30/2020 at 2:53 PM, linda s said:

You definitely need the right tires and 185r14 is the right size. As far a those differentials the 4 banger needs to run at pretty high RPMs . That 5.29 diff is going to be way to high for it to handle. Going to end up stalling a lot. The 4.56 is probably the best. There's only so much torque you can get from a little tiny engine especially when it's pulling a house. We all just learn to deal with it

Linda S

Wrong way Linda a 5.29 diff is a lower ratio! The engine will have to turn faster to achieve the same speed as a 4.56.

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1 hour ago, Maineah said:

... a 5.29 diff is a lower ratio!

 

Higher numerically. But lower gearing. :)

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Yes I do know the difference. A complete explanation every time you answer a question gets excessive though, don't you think.

Linda S

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Here are "just the facts"    At 60mph with LT185/14 tires.

4.10 ratio  3rd gear 3400rpm, O/D 2400 rpm

4.56 ratio  3rd gear 3750rpm, O/D 2700rpm

4.88 ratio  3rd gear 4000rpm, O/D 2900rpm

5.26 ratio  3rd gear 4450rpm, O/D 3150rpm

FWIW  "normal" O/D's are around 15%, including most Toyota manuals,. So IF Toyota used the RIGHT ratio in the A43D, with a 4.10 ratio, the engine would be turning 2950 rpm in O/D. Very close to what the 4.88 does with the 28% O/D.

With a 5.26 ratio the engine is running just a bit slower in O/D than the 4.10 is in 3rd

As always YMMV

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4 hours ago, linda s said:

Yes I do know the difference. A complete explanation every time you answer a question gets excessive though, don't you think.

Linda S

No criticism it's easy to get numbers confused. 

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