Will 3.73's kill my mileage?
- Thread starter buddyf87
- Start date
89MustangGX
I have nothing productive to add!
I never saw upper 20's in mileage before, but I did see low 20's -- which was higher after the gear swap.
DFG 5OH
Active Member
Well on a stock engine, with exhaust, and shifter, i get 17 in the city, and 25 on the highway. I hope its better once i get my H/C/I.
You guys with built engines, and gears getting better milage than me is really blowing my mind.
You guys with built engines, and gears getting better milage than me is really blowing my mind.
Joe 5.0
Founding Member
My city mpg improved with the gears, I believe mostly because the engine didnt have to lug off the line, it is much more effortless to get moving. Of course if you floor it all the time its gonna kill mileage, but if you drive nice you can still pull low 20's combined even with aggressive driving.
On the expressway I never drive less than 75mph, but I use cruise control whenever possible. I find it helps mileage because it cuts down on uneccesary throttle inputs.
I get 19-21mpg combined on average, but if I drive with efficiency in mind I can get 23-24mpg combined and 300+miles per tank. This past weekend I drove 200 miles straight on the expressway, all cruise control set at 75-85mph. Got 325miles to that tank and averaged 25mpg. That was even with a decent amount of semi aggressive passing.
On the expressway I never drive less than 75mph, but I use cruise control whenever possible. I find it helps mileage because it cuts down on uneccesary throttle inputs.
I get 19-21mpg combined on average, but if I drive with efficiency in mind I can get 23-24mpg combined and 300+miles per tank. This past weekend I drove 200 miles straight on the expressway, all cruise control set at 75-85mph. Got 325miles to that tank and averaged 25mpg. That was even with a decent amount of semi aggressive passing.
DFG 5OH
Active Member
HGFireHazard
Member
My dad put 373's in his '88 GT and I believe he got a 21 1/2 tooth red gear from a Ford dealership here in Michigan. I'm not entirely sure so I'll ask him when he comes home from work today, but I think it's almost 100% accurate... but don't quote me yet.
a_k
New Member
I need to get some 3.73's in by the end of the month I have decided. NOt trying to change a topic here but with so many people answering with them already, when you got them installed did you get all new bearings and everything. One shop told me to do it right and replace everything while he is back there im looking at upwards of $1000. Im going to start looking around for better prices but thanks for the help.
Adam
Adam
94-302-vert
Active Member
There is a guy that advertises in the bargainnews taht says all parts included, $695 (i think) for gears, trac-loc rebuild and all new bearings and seals... I vote to do it all at once... well I ended up doing all new bearings etc after I had my pinion bearing get wiped shortly after the gear install...
CManT1914
New Member
a_k said:
You butt should hurt if you pay $1000 for gears. Here's what everything typically costs:Gears: $150
Install kit: $50
Labor: $200-$300
You shouldn't have to pay more than $400 - $500 for everything.
TripleBlack95
Member
So I'm guessing I should go with 3.73's over 3.55's? This thread pretty much answers my concerns for gas mileage. Thanks guys.
