Author Topic: Gearing my automatic yota (Read 3397 times)

toy85ota · « **on:** Oct 18, 2006, 11:35:44 AM »

I was thinking about putting 5.29's in my yota with an automatic. Is it worth it to regear my axles in an automatic cause wouldn't it be the same as pushing the pedal down farther and holding out each gear? I'm just confused on how it would help with an auto. If anyone has experience can you tell me yours. Like right now I travel at 55mph at 2500rpm in third gear(I dont ever use 4th/OD with 33's), how will each gear change to for rpm's anyway, is it just going to be screaming before changng gears?

toynorcal · « **Reply #1 on:** Oct 18, 2006, 02:10:09 PM »

If you are only going to be running 33inch tires, then you certainly don't need 5.29's. You may want to use a 4.56 but nothing lower than a 4.88

Consider a mountain bike shifter with 4 sprockets. The gears you have in your truck right now would be the equivelent of using the larger sprocket; it takes more energy to get going in that gear, but once you are up to a cruising speed it will roll along nicely as long as you dont hit any inclines or head wind. The smallest sprocket would be like running a set of 5.29's; it takes almost no energy to reach its top speed and easily maintains that speed through inclines and head wind, but the top speed is slower and less efficient than the larger sprockets.

It's a balacing act of performance and fuel efficiency.

Gittinit · « **Reply #2 on:** Oct 18, 2006, 06:31:45 PM »

A good friend of mine runs 5.29 gears in his 85 runner.

I have driven it a couple times and am ammazed at how well it gets up to speed. It seems to me to be gutless in od though. Quite often on the trail he is left wanting more, but nothing a stronger motor wont cure. He will never be able toeficently pull ties larger than 33s without dual t-cases though ,in my opinion.

toy85ota · « **Reply #3 on:** Oct 18, 2006, 09:18:06 PM »

my truck it so gutless with stock gears its not funny, when I hit it hill its not even funny how slow go, what can I do for better power with out swappiing in a 5 speed, I have exhuast and header what else can I do.

854RUN · « **Reply #4 on:** Oct 19, 2006, 01:07:12 PM »

go with the 5.29, 5.29 and a auto and 33 u will be happy

79coyotefrg · « **Reply #5 on:** Oct 19, 2006, 01:26:52 PM »

think of it this way, Toyota put 4.30's in the auto trucks stock, 5spds had 4.10s

so if a manual truck with 33's needs 4.88's you need 5.29's with the auto no bigger than 33's though

toy85ota · « **Reply #6 on:** Oct 19, 2006, 02:28:01 PM »

what rpms are my gears going to be changing at. I dont want to be redlining it.

toynorcal · « **Reply #7 on:** Oct 19, 2006, 04:09:05 PM »

Quote from: 79Coyotefrg on Oct 19, 2006, 01:26:52 PM

think of it this way, Toyota put 4.30's in the auto trucks stock, 5spds had 4.10s

so if a manual truck with 33's needs 4.88's you need 5.29's with the auto no bigger than 33's though

No, there are alot of manaual rigs out there that run a 4.88 and 37" tire combination on daily drivers with out any problems. We are talking about a set of 33" tire here... running 5.29's is going to give the best power yes, but its not power that is necessary when the trade off is lower fuel economy. 4.88's will pull a hill easily in over drive (.7 ratio). But then thats just my thoughts

http://www.intercotire.com/site63.php

These guys say a 5.29 is the most you will need to use for a 36 inch tire and the most fuel economy on a 44 inch tire...

79coyotefrg · « **Reply #8 on:** Oct 19, 2006, 07:49:17 PM »

Quote from: toynorcal on Oct 19, 2006, 04:09:05 PM

No, there are alot of manaual rigs out there that run a 4.88 and 37" tire combination on daily drivers with out any problems. We are talking about a set of 33" tire here... running 5.29's is going to give the best power yes, but its not power that is necessary when the trade off is lower fuel economy. 4.88's will pull a hill easily in over drive (.7 ratio). But then thats just my thoughts

http://www.intercotire.com/site63.php

These guys say a 5.29 is the most you will need to use for a 36 inch tire and the most fuel economy on a 44 inch tire...

um yea but interco's site is assuming a v6 or v8

79coyotefrg · « **Reply #9 on:** Oct 19, 2006, 07:51:11 PM »

Quote from: toy85ota on Oct 19, 2006, 02:28:01 PM

what rpms are my gears going to be changing at. I dont want to be redlining it.

throw some stock tires on the back and drive it, thats what you'll be like

the toy auto trannies NEED a lower geared R&P then manual trucks,

79coyotefrg · « **Reply #10 on:** Oct 19, 2006, 07:52:35 PM »

i have a 5 speed but when i regear im going with 5.29's and i wont run larger than 33's

Rocksurfer · « **Reply #11 on:** Oct 19, 2006, 07:58:39 PM »

I regeared my 86 auto with 4.88's, it does make a big difference since those big tires soak up power and that auto soaks up at least 15% of your hp over a stick which is 0%. My 86 was a turbo but I think the results will be the same. It definatly helps offroad too in the rocks and climbing hills and such, but nothing will help downhill except finding the wire for that electric torque converter and putting a switch on it so that it doesn't go into the stall mode. That was on my list of to-do's but I sold it before I tried it. If you find the wire you just have to be very careful if you shut it off, you'll blow the converter if you stop with it in the off position.

79coyotefrg · « **Reply #12 on:** Oct 19, 2006, 08:05:46 PM »

Quote from: Rocksurfer on Oct 19, 2006, 07:58:39 PM

I regeared my 86 auto with 4.88's, it does make a big difference since those big tires soak up power and that auto soaks up at least 15% of your hp over a stick which is 0%. My 86 was a turbo but I think the results will be the same. It definatly helps offroad too in the rocks and climbing hills and such, but nothing will help downhill except finding the wire for that electric torque converter and putting a switch on it so that it doesn't go into the stall mode. That was on my list of to-do's but I sold it before I tried it. If you find the wire you just have to be very careful if you shut it off, you'll blow the converter if you stop with it in the off position.

thats why you rig it on a relay to the brake lights

Rocksurfer · « **Reply #13 on:** Oct 19, 2006, 08:11:06 PM »

Sometimes even if you have the switch you will need to brake and that will trip the stall and weeeeeeeeeee!

toynorcal · « **Reply #14 on:** Oct 20, 2006, 08:20:36 AM »

Quote from: 79Coyotefrg on Oct 19, 2006, 07:49:17 PM

um yea but interco's site is assuming a v6 or v8

I guess I must be missing something then. Quote from the site ...

"These calculations are assuming a manual transmission with a 1:1 ratio. If you drive an automatic your RPMs will be higher, and the opposite is true if you have overdrive (your RPMs will be lower)."

My wifes rig is a stock v6 auto with 32's and I dont have to re-gear it at all, but if I did I wouldn't go lower that 4.56's wich would probably turn up to a 35" tire easily. So I see 4.88's in a 4cyl auto with 33's working out the best. But hey it's not my rig, just my thoughts.

Gittinit · « **Reply #15 on:** Oct 20, 2006, 08:49:37 AM »

Quote from: toynorcal on Oct 20, 2006, 08:20:36 AM

I guess I must be missing something then. Quote from the site ...

"These calculations are assuming a manual transmission with a 1:1 ratio. If you drive an automatic your RPMs will be higher, and the opposite is true if you have overdrive (your RPMs will be lower)."

My wifes rig is a stock v6 auto with 32's and I dont have to re-gear it at all, but if I did I wouldn't go lower that 4.56's wich would probably turn up to a 35" tire easily. So I see 4.88's in a 4cyl auto with 33's working out the best. But hey it's not my rig, just my thoughts.

I wouldn't know for shure about yours but I am shure that some v6 tyotas had the 4.56 gears stock. I think it was the sr5 models equiped with 31s stock. So I'm just wondering what gears your wifes runner has.

toynorcal · « **Reply #16 on:** Oct 20, 2006, 10:48:38 AM »

Quote from: gittinit on Oct 20, 2006, 08:49:37 AM

I wouldn't know for shure about yours but I am shure that some v6 tyotas had the 4.56 gears stock. I think it was the sr5 models equiped with 31s stock. So I'm just wondering what gears your wifes runner has.

Good point, we bought it used so and I never bothered to check because we don't have problems with it.

But I don't want to thread jack here, I just wanted to let this guy know that 5.29's arent the only way to go and maybe not even the best depending on what you want.

toy85ota · « **Reply #17 on:** Oct 20, 2006, 05:11:55 PM »

Ya I probably wont push anything biggers than 33's, Its just my trucks so gutless I wondering whats the best thing to do is besides swapping in a 5 speed.

79coyotefrg · « **Reply #18 on:** Oct 20, 2006, 05:19:07 PM »

Quote from: toynorcal on Oct 20, 2006, 08:20:36 AM

I guess I must be missing something then. Quote from the site ...

"These calculations are assuming a manual transmission with a 1:1 ratio. If you drive an automatic your RPMs will be higher, and the opposite is true if you have overdrive (your RPMs will be lower)."

My wifes rig is a stock v6 auto with 32's and I dont have to re-gear it at all, but if I did I wouldn't go lower that 4.56's wich would probably turn up to a 35" tire easily. So I see 4.88's in a 4cyl auto with 33's working out the best. But hey it's not my rig, just my thoughts.

if her runner is a early to mid 90's runner and came with 31's you already have 4.56 gears

some even had the factory 4.88's in the auto runners

kneedownnate · « **Reply #19 on:** Oct 20, 2006, 09:30:16 PM »

Quote from: 854RUN on Oct 19, 2006, 01:07:12 PM

go with the 5.29, 5.29 and a auto and 33 u will be happy

crawler925 · « **Reply #20 on:** Oct 27, 2006, 06:19:07 PM »

i have 488 gears in now and its ok but an sas is coming real soon and i will be going to 529 gears......... i cant wait!!!!!!

toy85ota [OP]

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toy85ota [OP]

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