MT with 4.88 gear swap.

Has anyone on here with a MT done the 4.88 gear swap yet? If so what RPM's you running at 70 in 6th. Also what tire size do you have?

 

Bump, I would like to know as well...

 

Your stock gears will sell quick on here.

 

You looking to run the 4.30's?

 

If not others will be! Let me know when you swap

 

Will do you'll be the first i let know.

 

Not sure if its true or not but some other members were saying that due to the transmission gearing on the Manuals that final drive rations on the MT with 4.30 are still lower than the auto with 4.88. If that is true, going to 4.88 in the Manual would be super low geared. Better be running 35's or it will be screaming at 75 mph. Just a thought.

 

Its true, its what's holding me back from re-gearing... The lower the gear ratio, the lower the rpms become @70mph. Personally 285s, 4.56s seems like the way to go for a MT, but of course no one releases the gears that I need/want.

 

Bump

 

So I just bought my 4.88s off just differentials while they had their black friday sale, and I will be selling my 4.30 gears when the re-gear is done PM me if interested. I will let you know what the rpms are at going 75 mph,but as of right now I sit at 2500ish rpms, im assuming i will be at 2900-3000 rpms range after the re-gear.

 

Awesome man can't wait to find out the how you like it. Whats your tire size?

 

285s

 

Have you checked your speedometer? that seems very high rpms for that speed. I'm only 2500 rpms at 75 with 265/75s.

 

I'm sure it's a little bit off, but not by much, I have not calibrated my speedo but I will after regearing.

 

TRD OR 265/70/r16 (30.61in) with 4.88's in 6th at .71 will be at 2662 rpm at 70mph, 4.30 is 2346 rpm at 70mph.
TRD Sport 265/65/r17 (30.56in) with 4.88's in 6th at .71 will be at 2667 rpm, 4.30 2350 rpm at 70mph.


http://www.grimmjeeper.com/gears.html

 

So i just checked grimmjeeper.com/gears for my setup at 75mph with 285/70r17s

It shows:
2352rpms with 4.30s
2669rpms with 4.88s

If that's the case I will be completely satisfied with the outcome of 4.88s.

 

4.88 isn't that bad in all reality. It's less of a jump than 5th to 6th in stock gearing. I'd almost say it's a must do for auto trucks with the 3.9 rear end even running stock suspension and tires.

 

That sounds about right as I am 2500 rpms with 4.30 and 267/75.