Seeking 4.10 Gear Installation Advice!!!
 

Hey Guys!!
I am in the process of installing Ford Racing 4.10 Gears in my 98' GT, I need to know the initial pinion depth?? Also, is there a break in period for these gears?? Any ideas would be much appreciated!! Thanks! :confused:

Re: Seeking 4.10 Gear Installation Advice!!!
 

FRPP gears generally aren't marked with a pinion depth. Simply use the same shim that was underneath the pinion bearing of your old gears.

Re: Seeking 4.10 Gear Installation Advice!!!
 

well we got the gears in and they are nice and very quiet we must of done them right now i need to correct the spedo i heard i need a 23 tooth spedo gear is that correct and is that the best way to fix it?

Re: Seeking 4.10 Gear Installation Advice!!!
 

For a 98 with a T-45, yes, the speedo gear is the way to go.

This should help you to find the correct piece:
http://www.performanceparts.ford.com...charts/142.pdf

Re: Seeking 4.10 Gear Installation Advice!!!
 

i called the local ford dealer and they dont make a 23 tooth spedo gear they told me to go to dodge to get the gear. i also talked to a tranny shop and he said that each tooth is 2mph and iam off 14 mph so a 23 tooth wont be enough my car has a 21 tooth please help

Re: Seeking 4.10 Gear Installation Advice!!!
 

Did you not look in the chart I attached?

What size tires are you running on the car?

Re: Seeking 4.10 Gear Installation Advice!!!
 

Steeda sells a 23 tooth gear.
http://www.steeda.ca/catalogue_product_1238.asp
Unfortunately, it will still be off with 4.10s.....

Re: Seeking 4.10 Gear Installation Advice!!!
 

hammer, i did the calculation per the link you attached. i've got a 8 tooth, 3.73 ratio, and whether i have 800 or 815 (don't know exact) tire revolutions formula says i need a 24 tooth gear. do they make such a thing. i've got 275/40-17's on 17x9" rims on a t-45 equipped 96 gt which had a 3.27 stock, not 3.08's like other GT's of that year (it's a GTS). speedo feels about 8-10 mph off. what do you suggest?

Re: Seeking 4.10 Gear Installation Advice!!!
 

Two options:
1. Get the 23 tooth gear and get pretty close (That's what I used with my 98 and 3.73s)

or

2. Call Dallas Mustang and ask if they make a speed-cal for your application:
http://www.dallasmustang.com/page/pr...p?product=9910

Re: Seeking 4.10 Gear Installation Advice!!!
 

Like the HAMMER said. get the Steeda 23 tooth or I think you can get a speed cal. I have the 23 tooth and it's off, but I never look at the speedo anyway!!

Re: Seeking 4.10 Gear Installation Advice!!!
 

i bought the speedcal i will be puting it in fri i called a spedo company they told me that was my ony option for a 98 auto kind of sucks 200.00 for gears and 200.00 for speedcal thank god my buddie did the gears. also not that impressed with gear change dosent seem like that big of a difference could it be the auto trans or is the 98 just that week?

Re: Seeking 4.10 Gear Installation Advice!!!
 

cornnuts-- sorry to butt into your post., see my reply above. figured it was relevent to the topic. thanks for the tips HAMMER and SURFBEAST!