How can I find out which gears I have in my rear diff? The TB comes
with 3.42, 3.73 and 4.10 gears available. I want to upgrade to the 3.73
or 4.10 gears for more towing capability, anyone suggest which one?
Also, how hard is it to change the gears? I know I'll have to reprogram
the speedometer, do I need a dealer to do that?
If it is 4x4 your looking at changing both ends. It is NOT a DIY item
unless you have LOTS of practice with gearing.
All in your probably looking at between 2000.00 and YES the computer
does need to be reprogrammed, it controls much more than just the
speedometer. Shift points, engine management and the ABS system are
slightly different depending on gear ratio.
As to the current ratio, look in the glove box for the options sticker.
On it look for a code that has GU in it and post it here. That will tell
you what the gearing is. Keep in mind that just because you increase the
gearing that does NOT increase the braking ability. Make sure your
brakes are rated for the higher amount first or you might be better off
The brake capacity is also on that option code sheet.
"Mike Brancato" < email@example.com> wrote in message
Mike here's a link to TB's rpo's. It's for an '03 but it shows what the
various codes in on the inside glove box means. If you have an '04 in all
probability it will still give the the correct codes for the axle ratios and
be mostly correct.
I think the trailer weight and the terrian where you'll tow it would dictate
the "best" axle ratio. If you don't have a trailer yet you might give it a
try before spending big bucks to change the axle ratio.
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