4.88 final drive
 

Hi guys!

For the ones who used a 4.88 final drive, what is your experience with it?
Good or Bad? Would you prefer a 4.56 over it?

Also, anyone got a contact with spence weir? tried emailing and all but got no reply. does he have a new email?

thanks!

Don't have one so I can't comment, but here's a good video in case you haven't seen it.
https://www.youtube.com/watch?v=9X_jYLtoCMg

call him on the phone
 

A number of us have found that calling him is the best way to get him

If you're keeping it NA 4.88 would be super fun. If planning on boosting 4.56 is probably what you want to go for the most.

I recommend AutoFactory's final drive. Have purchased a defect from Spence and left my car almost 2 months on Jackstands because he refused to take fault. Weir's tolerance on their gears aren't too good. Autofactory use OEM Toyota 4.88 from a 4Runner with an adapter plate to fit.

If you still go with Spence hopefully you get a good working one with no issues!

The opposite to what you are asking...

I have the 4.56 gears in a NA car. I love them, however I sometimes wish I went 4.88; overall I am glad I did not for the following reasons:

1) I do a lot of freeway driving (sometimes 150 miles/day). With the 4.56 it translates to about 3500 RPM for 70 MPH, 4000 RPM for 80 MPH. I would not want much higher.

2) Now that I have started tracking the car more I like the fact that I can hit 79MPH in third and 101MPH in fourth... I rarely leave these two gears on the tracks near me.

What is the reason you want FD swap? Tracking, autox, drag, roll race, hwy puller?

Is there a speed you routinely accelerate up to IE 40-100mph pulls, and/or a speed you never go over or don’t care about or need to exceed?

A FD gear swap is highly situational and a more aggressive FD can actually accelerate slower in many situations.

I’ve had 4.1 and 4.56 as NA I would not want more aggressive then a 4.56 as your top speed in 5th becomes very low with a 4.88+ and you’ll have zero acceleration in 6th still. You may also find yourself in very odd gearing positions at typical 45,60,70mph cruising speeds and not be able to downshift to optimal gear as it’ll put you too close to redline and you’ll shift half a second later anyways. Lots of scenerios where it can help and lot where it can hurt. Highly situational.

I’ve also had 4.1, 4.3, and 4.56 while supercharged at about 285whp/220wtq.
4.56 was too aggressive for FI, you got the power to not need that much aide of added mechanical torque through gearing to make sacrificing top speed per gear to that extent worth it IMO. IIRC 4.56 1-1 gear (5th mt/4th at) tops at like 114mph, 4.3 is like 125mph with FI 114mph is too low/slow for me. When NA it was fine. However at sub probably 350whp getting some added mechanical torque (4.3 FD) is still nice.

But again so many situations and variables in determining optimal FD ratio.

Many people that track, TA, AutoX have multiple rear diffs with different FD ratios to swap per event.

May ask you Link where you got yours?

Got my auto factory from rhdjapan.com, great quality no different than oem.

Or.... you can order actual OEM gears (at least up to 4.56) from one of the Japanese forwarding services like fromjapan.com - that's what I did. Japanese auction sites will generally not ship outside of Japan - so companies like fromjapan.com act as forwarding shippers. No affiliation - just a happy customer.

Got mine from rhdjapan.

Autofactory use brand new OEM gears in their packages. Only thing they add is the spacers (with their 4.875 ratio from a Toyota 4Runner) and high strength bolts which is their own brand. They do shipping which wasn't too expensive. Considering OP is from Phillipines shouldn't be expensive either. Just tax is not included in their final price.

hello! yup, im planning to use it as a track and street setup.

tracks out here have short straights except for one so i guess, acceleration out of the corners will play a big part. i do have though a edelbrock sc and i do have around 250whp.

this is the reason why i ask whether you guys have tried 4.88. i tried driving a 320whp brz as well with a 4.56 and i enjoyed it. hence the question if 4.88 is better accelerating without
sacrificing too much top speed or better stick with 4.56

btw my car is automatic