On another note I NEED HELP! After putting my gears in and not seeing any power gain i found i needed to turn my timing up and it gave me much better cruising power but still only at 70mph thats when im getting on the peddle. I have a CE light for a code 25 & 43 which from i read is for the o2 sensor.so i put a new manifold flange gaskets in to seal the leak and reset the computer.still same codes.anyone think that replacing my o2 sensor would give me more power?also i get terrible mpg.like 10mpg not even kidding.please anyone help me!! My wallets getting thin

 

Even with an auto trans, with 4.88s it should do ok. Especially with the gears you had before(3.90 vs 4.88). That's nearly a 25% reduction in gearing, and should be noticeable. It would be similar to going to 5.29s from 4.10s while keeping the same size tires... It should be a good bit peppier...

I'm thinking maybe something else is going on. Maybe the auto is causing some issues, since you said your motor is in good shape.

 

Well at take off it slips going into second and just revs real high till i let off the gas then it switches.thats where it lacks power

 

Also replacing the o2 should give me better mpg

 

our older yota are never good on the freeway. 70mph and youre gunna be pushing some high rpms. And older 22re wont like it. My old motor leaking oil around town, but with 4.56 gears and 31's(close to stock) The oil leaked worse on the freeway pushing over 3000 rpms...obviously. Closest to stock is going to be 5.29's with 35's, 4.88 with 33's. I've heard having 35's and 4.88 is like having stock gears and a 31 or 32 inch tire. Slightly doggish...

But if you dont pull alot of hills then 4.88 might be nice. Crawling ratio for wheeling mostly comes from the t case any ways I think.

 

Im probably over using this thread for all my off topic questions but u guys have helped alot. So this is what i got going now.i replaced the o2 sensor an the codes went away.not much mpg gain.should i reset the computer overnight for this by disconnecting the batt? Also i think the prob with my tranny slipping is the filters clogged again because i never drained the x case when i did the change a month ago(it worked when i first changed the filter) any input?

 

I was looking to regear an went to many different people to only find out they wanted to charge me astronomical amounts. Found a set of 4:88s with 3rd members out of a 94 4runner for 600. Best thing I did.

 

I have an 85 4+4 an with a Weber carb so I didn't have to deal with all the sensors an junk. Less vacuum leaks an better mileage. I also bought a header from LCE headers. Best decision. All new exhaust with 4:88s she runs like a champ. Changing the motor out in a few weeks for an 83 with double roller timing chain version.

 

Sounds more like a vacuum leaks or exhaust. 02 sensors are very common for going out.