Just installed 4.10 gear

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45AnnEdGT

Member
#1
#1
Just had installed a Ford Racing 4.10 gear on my 09 GT 5sp. (Ford Racing install kit from American Muscle) The stock gear was a 3.55. Installed a Steeda rear upper adjustable control arm at the same time. Hope I didn't make a mistake changing two variables at once. Have a very slight thunk when shifting gears or if I take my foot off the gas and then get back on the gas. My mechanic wants me to take it easy for the first 500 miles and then will change the oil and tighten it up, add, move a shim. The car has 9700 miles on it and is tight, no other squeaks, rattles or clunks. MGW shifter,Steeda lower control arms and underdrive pulley, Steeda CAI, Ford Racing 62mm throttlebody, BAMA 93oct per tune, Bassani axel back,Steeda strut tower brace. Anybody have any thoughts on the rear gear ?
 
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Charged5.0

Charged5.0

Well-Known Member
#2
#2
I have 93 gt with 4.10's and a 5 spd it's also supercharged and get about 9 miles a gallon. When I do the big brake /5 lug / rear disc brake conversion this winter I will be changing the gears to 3.73 to hopefully improve the mpg a tad
 
4

45AnnEdGT

Member
#4
#4
When I picked up the car in the afternoon I drove it very slowly with (probably) an over critical ear, and was just starting to get used to the feel of the new gear, plus the back seat was still out of it from installing the control arm so there was extra noise. Last night I put the seat back in and just drove it around a bit. Took it for a ride early this morning and had a chance to grab 2nd up to 5 grand. On the expressway it's doing 2250 rpm at 70 mph in 5th gear. It's like a different car. Will have to take it for a drive to Captree in the morning. It's not my DD so I'm not to concerned about the mpg.
 
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